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37results about How to "Improve disturbance suppression ability" patented technology
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Improved fast reflecting mirror disturbance observation compensation control method based on multi-closed loop
InactiveCN106814624AImprove disturbance suppression abilityReduced disturbance suppression residualsAdaptive controlControl systemStabilization control
The invention discloses an improved fast reflecting mirror disturbance observation compensation control method based on multi-closed loops, and solves the problems that an existing fast reflecting mirror stabilized platform is poor in low frequency disturbance inhibition capability, and cannot satisfy higher precision stabilization control system demands; the method can improve a conventional disturbance observer on the multi-closed loop control basis, thus moving forward compensation nodes, using an acceleration controller to simplify a disturbance compensation object, smartly avoiding the system low frequency compensation capability deprivation problems caused by twice integral windup in a conventional compensation controller, and strongly improving the system low frequency disturbance observation compensation inhibition capability; the method can optimize the system on the control algorithm, and no extra sensor is needed, thus ensuring the system original characteristics, and saving cost; in addition, the method can simplify the control structure, and can be easily realized in engineering.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Control method for increasing disturbance inhibition capability of quick reflector stabilized platform
InactiveCN106482735AImprove disturbance suppression abilityReduced disturbance suppression residualsNavigation by speed/acceleration measurementsEngineeringAcceleration Unit
The invention discloses a control method for increasing disturbance inhibition capability of a quick reflector stabilized platform. By aiming at the problems that disturbance inhibition capability of the quick reflector stabilized platform is insufficient, and more precious and stable control requirement cannot be satisfied, After acceleration, speed and position three loops are closed, the disturbance acceleration is observed and estimated by using a disturbance observation compensator, then feedforward compensation is carried out, so that a part of disturbance moment is offset, and the stable capability of the stabilized platform is increased. The method optimizes the system from control algorithm, addition of a sensor is not required, original characteristic of the system is guaranteed, cost is saved; simultaneously, the method has the advantages of intelligible thinking, simple structure, and easy realization of engineering, and can perform the advantages under condition of difficult measurement of disturbance.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
A dual-frame MSCMG frame system high-precision control method based on self-adaptive sliding mode compensation
ActiveCN105116934AEliminate the effect of angular rate tracking accuracyGuaranteed closed-loop stabilityMechanical power/torque controlTracking errorSliding mode control
The invention discloses a dual-frame MSCMG frame system high-precision control method based on self-adaptive sliding mode compensation. Firstly, a dual-frame servosystem kinetic model is established; Input and output inverse mapping of a frame system is derived in a differential geometry approach, and then a a pseudo-inverse system of a frame system is obtained so as to realize kinetic decoupling control of the frame system and eliminate influences by coupling moments between frames; then on the basis of a differential algebraic spectrum theory, a tracking error stable control law is derived so as to enable the frame system to have certain response characteristics and guarantee the stability of the frame system; and finally, on the basis of an RBF neural network and a sliding mode control theory, a self-adaptive sliding mode compensation controller is designed to carry out compensation control on residual coupling, involved toques and nonlinear friction to enhance the disturbance inhibition ability of the frame system to realize high-precision angular rate tracking control of the dual-frame system. The method of the invention is simple and is simple to implement. The method is applicable to high-precision decoupling control of the dual-frame Magnetically Suspended Control Moment Gyroscope frame servosystem.
Owner:BEIHANG UNIV
Disturbance suppression method based on compound disturbance observer
The invention discloses a disturbance suppression method based on a compound disturbance observer, and aims at the problem that system requirements can not be stably controlled at high accuracy sincethe low-frequency and middle-frequency disturbance suppression capability of a control system stable platform is poor. By use of the method, on the basis of multi-closed-loop control, a traditional disturbance observer design is improved, the compound disturbance observer structure is put forward, and a design method for an inner and outer ring feedforward compensation controller in the compound disturbance observer is given. By use of the method, an outer ring in the compound disturbance observer is utilized for estimation, inverse feedforward of a middle-frequency band and external disturbance, and an inner ring is used for estimation, inverse feedforward of a low-frequency band and external disturbance. The inner ring and the outer ring of the compound disturbance observer simultaneously act, finally, the purposes of simultaneously improving the disturbance suppression capability of the low frequency band and the middle-frequency band of the system and improving and controlling system stability accuracy are achieved.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Virtual multi-closed loop-based disturbance measurement feedforward suppression method
ActiveCN110543123AHigh stability and precisionReduce load requirementsProgramme controlComputer controlFiberClosed-loop pole
The invention discloses a virtual multi-closed loop-based disturbance measurement feedforward suppression method. The virtual multi-closed loop-based disturbance measurement feedforward suppression method is used for improving the disturbance suppression capability of a control system stable platform so as to meet the demand of a higher-accuracy stable control system. A virtual gyro is obtained bya method of integrating an accelerator and a position sensor, and a fiber gyro of the stable platform is substituted by the virtual gyro. On the basis that virtual multi-closed loop control is achieved by the virtual gyro, the substituted fiber gyro is arranged on a carrier rack and is used for measuring an external disturbance speed, and an ideal feedforward compensation controller is used for feedforwarding the external disturbance to a control loop so as to actively suppress the influence of disturbance. On the premise that the system stability is not completely affected, the load and space requirement of the stable platform is effectively reduced, the disturbance suppression capability of the system is effectively improved, so that the stable platform obtains higher stability accuracy.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Design method of dual compensators of dual-way feedforward disturbance observer
ActiveCN110032074ASimple structureImprove disturbance suppression abilityAdaptive controlIntermediate frequencyControl system
The invention discloses a design method of dual compensators of a dual-way feedforward disturbance observer. A system stability control platform has insufficient low frequency and medium frequency disturbance suppression capability, thereby failing to meet higher precision demand of system stability control. Design of the traditional disturbance observer is improved based on multi-closed loop control, so as to provide a design method of dual compensators of a dual-way feedforward disturbance observer. Design of the dual-compensator is based on system stability at first, and then design of disturbance suppression based on different frequencies is conducted, wherein an inner loop disturbs a feedforward loop to suppress low frequency disturbance, and an outer loop disturbs the feedforward loop to suppress medium frequency disturbance, and the dual compensators act simultaneously so as to improve low frequency and medium frequency disturbance suppression capabilities of the system, therefore, the system stability is ensured, and system stability control accuracy is improved effectively.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Photoelectric tracking system control method based on improved Smith estimator
InactiveCN109164709ASolve the impact of speed closed-loop bandwidthImprove disturbance suppression abilityAdaptive controlTime delaysSystem stability
The invention provides a photoelectric tracking system control method based on an improved Smith estimator. For the problems of delay and insufficient anti-interference capability existing in a current photoelectric tracking system, the influence of the delay on the system stability is reduced by using a Smith time lag compensation principle, and meanwhile, the control structure of a classic Smithestimator is improved, so that a control structure capable of shortening the time delay and effectively improving the disturbance suppression capability of the system is realized. The core is that the influence caused by the delay and the disturbance amount are estimated by using an error feed-forward thought and are fed forward into a forward channel of a control loop, so that the delay compensation and the disturbance compensation are realized. According to the method, the adverse influence of the delay on the system is eliminated and the disturbance suppression capability of the system isfurther improved, so that the stability of the system is higher.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Novel AGC control method of circulating fluidized bed boiler
ActiveCN105889910AReduce hysteresisReduced hysteresis effects on fuel volumeFluidized bed combustionApparatus for fluidised bed combustionFluidized bedState space
The invention discloses a novel AGC control method of a circulating fluidized bed boiler. The novel AGC control method comprises the following steps that S1, the step response coefficient of a controlled object is acquired; S2, the state space approximate expression form of the controlled object is acquired; S3, a prediction model of predictive control is acquired; S4, rolling optimization of the control method is carried out; and S5, feedback compensation of the control method is carried out. According to the method, the dynamic adjustment function of primary air on the boiler side on the unit power of the steam engine side in the dynamic process of the circulating fluidized bed boiler is fully utilized, hearth bed materials are fully utilized for energy storage, the lagged effect of the boiler fuel amount is reduced, and the disturbance suppression capacity of a system can be improved through an improved predictive control algorithm.
Owner:SOUTHEAST UNIV
Double-filter disturbance observer method based on inertia loop
ActiveCN111338215AImprove disturbance suppression abilityIncrease flexibilityAdaptive controlControl engineeringControl theory
The invention discloses a double-filter disturbance observer method based on an inertia loop. The method is used for improving the disturbance inhibition capability of an inertial stabilization platform so as to meet the higher-precision inertial stabilization demands. In an inertia loop, the first filter is the same as a filter of a traditional disturbance observer and is restrained by system stability, and the disturbance restraining capacity of the first filter is weakened. On the basis that the first filter meets the stability constraint, the second filter is not subjected to the stabilityconstraint in combination with an inertia loop closed-loop controller. Therefore, the filter II can be used for compensating the disturbance suppression capability sacrificed by the filter I for ensuring the stability of the system, so that the system obtains stronger disturbance suppression capability. On the premise of ensuring the stability of the system, the performance of the disturbance observer is brought into full play by using the double filters, and the disturbance suppression capability of the system can be effectively improved, so that the inertial stabilization platform obtains higher stabilization precision.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Tilting mirror vibration suppression method based on improved disturbance observer
ActiveCN108646568ALow costOptimizing the Sensitivity FunctionAdaptive controlControl systemClosed loop
The invention discloses a tilting mirror vibration suppression method based on an improved disturbance observer. Since mechanical vibrations of an astronomical telescope make the closed-loop performance of a telescope control system decline and these vibrations cannot be well remedied by a classical control structure, the method adopts a tilting mirror to suppress the vibrations. According to themethod, by designing an improved Q filter., a sensitivity function of a tilting mirror control system is optimized, the large-amplitude vibrations are effectively suppressed, and the influence of a water bed effect on the system performance is reduced. Under the case that the system disturbance frequency is known, the control method can achieve optimal correction, and the disturbance suppression capability of the system is effectively improved. According to the method, the system is optimized from a control algorithm, only one image sensor is needed, and the cost is saved. At the same time, the method is clear, the structure is simple, there is no dependence on models, and the method is easy to operate and implement.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Low-frequency-band disturbance suppression method based on acceleration measurement
InactiveCN109683482AImprove drift suppression abilityImprove disturbance suppression abilityAdaptive controlSignal-to-noise ratio (imaging)Low frequency band
The invention discloses a low-frequency-band disturbance suppression method based on acceleration measurement. The problem is solved that outside low-frequency disturbance exists in a control system and it is difficult to further improve the low-frequency-band disturbance suppression capability of the system by an accelerometer and a control method in the environment where a large amount of driftin a low frequency band. An improved disturbance observer structure and a designed special feedforward compensation controller are added based on the three closed loops of acceleration, speed and position. The low-frequency-band disturbance suppression method can eliminate most of the influence of the drift amount of an acceleration sensor, reversely feeds forward the outside disturbance amount ofthe low frequency band to a driving circuit to offset the influence of the outside disturbance, and effectively improves the low-frequency-band disturbance suppression capability of the system. The method optimizes the system in control algorithm, requires no additional sensor, saves cost and has good practicability, is easily implemented by engineering, and is also suitable for other sensors that have a large amount of drift due to low signal to noise ratio, and is used for suppressing the influence of the drifting amount of the sensors.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
High-precision controller for ultra-low-speed control moment gyroscope frame servo system
ActiveCN112859612AAddressing the issue of poor estimation performanceImplementing Instantaneous Velocity EstimationAdaptive controlState observerControl engineering
The invention provides a high-precision controller for an ultra-low-speed control moment gyroscope frame servo system. Firstly, a discrete time system state-space equation is obtained according to a continuous time system state-space equation of the ultra-low-speed frame servo system, then accurate estimation of instantaneous speed and lumped disturbance is achieved by designing a double-sampling-rate extended state observer, and finally, a composite sliding mode control algorithm is designed based on sliding mode control and disturbance compensation in a speed ring to suppress lumped disturbance. According to the high-precision controller for the ultra-low-speed control moment gyroscope frame servo system, provided by the invention, the double-sampling-rate extended state observer is designed to solve the problem that the estimation performance of an existing estimation method becomes poor under the influence of factors such as model parameter change of the ultra-low-speed frame servo system; the composite sliding mode control algorithm is further designed to enhance the disturbance suppression capability of the system; and starting from two aspects of sensing detection and disturbance suppression, the angular rate control precision of the ultra-low-speed frame servo system is comprehensively improved.
Owner:BEIHANG UNIV
Model-free predictive current control method for permanent magnet synchronous motor
ActiveCN112910362AImprove disturbance suppression abilityHigh precisionElectronic commutation motor controlAC motor controlElectric machineMathematical model
The invention provides a model-free predictive current control method for a permanent magnet synchronous motor. Firstly, a permanent magnet synchronous motor mathematical model is replaced by a single-input single-output hyper-local model, and the hyper-local model does not need any motor parameter information and is also called no model. Then, a sliding mode observer is adopted to estimate current errors caused by parameter disturbance, and feedforward compensation is carried out; and finally, simulation and experiment results verify that the provided model-free predictive control method can suppress parameter disturbance and has parameter robustness.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY +1
Specific frequency disturbance suppression method for precision motion platform
ActiveCN112612210AImprove athletic abilitySuppress disturbanceAdaptive controlControl signalFeedback controller
The invention discloses a specific frequency disturbance suppression method for a precision motion platform. The method comprises the following steps of 1, generating an expected position signal r of a precision motion platform P by a track generator Cr; 2, measuring an actual position signal y of P; 3, subtracting the r from the y to obtain a position error signal e, and enabling the e to pass through a feedback controller C to obtain a feedback control signal ufb; 4, the control signal u of the previous period passing through a filter Q to obtain a signal uQ; 5, calculating the inverse product of Q and the nominal model P0 of the precision motion platform, and obtaining uPQ after y passes; and 6, subtracting uPQ from uQ to obtain a disturbance signal estimated value; seventhly, subtracting ufb from uQ to obtain a current period control signal u, and enabling the sum up of u and an external disturbance signal d to act on P to generate a position signal y. According to the method, disturbance within a certain frequency range can be suppressed to a certain extent, and the suppression capability can be enhanced for specific frequency disturbance, so control performance of the precision motion platform is further improved.
Owner:HARBIN INST OF TECH
SCR denitration system disturbance suppression prediction control method based on converted ammonia injection amount
ActiveCN111413938AReduce the level of deviationSimplify the modeling stepsTotal factory controlProgramme total factory controlTransfer function matrixControl system
The invention discloses an SCR denitration system disturbance suppression prediction control method based on a converted ammonia injection amount. The method comprises the steps: defining a transfer function matrix of a system; converting into a discrete state space model; setting a controlled quantity constraint condition; calculating a model matrix required by calculation of the incremental disturbance observer; obtaining an estimated value of the generalized state of the system; calculating an optimal control vector; calculating by an incremental disturbance observer; calculating a conversion ammonia spraying instruction at the current moment; sending the real-time control quantity to an actuator. According to the method, the disturbance inhibition capability of the control system can be remarkably improved, meanwhile, the robustness is high, the influence of model mismatch on the control system can be effectively coped with, the deviation level between the NOx concentration at theoutlet of the denitration device and the set value is reduced, and the control effect is improved.
Owner:南京英璞瑞自动化科技有限公司
Disturbance suppression system and method based on combination of model inverse structure and multi-ring frequency division disturbance observer
ActiveCN112994093AGood tracking effectImprove anti-disturbance performanceSingle network parallel feeding arrangementsReactive power adjustment/elimination/compensationOvervoltageSynchronous motor
The invention relates to a disturbance suppression system and method based on the combination of a model inverse structure and a multi-ring frequency division disturbance observer. The method mainly comprises the following steps that: a virtual synchronous motor controller is selected to pass through a control system based on the model inverse structure and the disturbance observer when a distributed power supply is connected to a main power grid through a voltage type inverter; the distributed power supply can actively participate in active frequency modulation and reactive voltage regulation processes of a power system, and voltage and current reference values are obtained at the same time; and the voltage and current controller is used for finely adjusting the injected voltage and current. The reliability of an inverter control system can be effectively enhanced, the stability is improved, current change and load power fluctuation caused by loop switching can be avoided when the operation mode of the micro-grid is switched through a static switch, and smooth switching of the operation mode of the micro-grid is realized.
Owner:HUBEI UNIV OF TECH
Suppression system and method based on model inverse structure and multi-loop frequency division disturbance observer
ActiveCN112994093BGood tracking effectImprove anti-disturbance performanceSingle network parallel feeding arrangementsReactive power adjustment/elimination/compensationOvervoltageMicrogrid
The invention relates to a disturbance suppression system and method based on the combination of a model inverse structure and a multi-ring frequency division disturbance observer. The control system based on model inversion and disturbance observer enables the distributed power generation to actively participate in the active power frequency modulation and reactive power voltage regulation process of the power system, and at the same time obtain the reference value of voltage and current; the voltage and current controller finely adjusts the injected voltage and current. The invention can effectively enhance the reliability of the inverter control system, improve the stability, and enable the microgrid to avoid current changes and load power fluctuations caused by loop switching when the microgrid switches the operating mode through the static switch, and realizes the smooth operation mode of the microgrid switch.
Owner:HUBEI UNIV OF TECH
A Disturbance Observation Compensation Control Method for Fast Mirror Based on Single Accelerometer
The invention discloses a single-accelerometer-based disturbance observation compensation control method of a fast steering mirror. In the prior art, the fiber-optic gyroscope employed by the fast steering mirror commonly has disadvantages of large size, high mass, high price, and high power consumption; and the inner-ring intermediate-low-frequency disturbance suppression capability of the exiting accelerometer is low because of low-frequency noises and the fiber-optic gyroscope can not be replaced. With the single-accelerometer-based disturbance observation compensation control method, the above-mentioned problems can be solved. According to the method, on the basis of acceleration feedback, a disturbance observer is added into an acceleration inner ring for feedforward processing; and the disturbance torque from the outside on the platform is observed and the is fed forward to an acceleration controller, thereby realizing disturbance compensation, enhancing the capability of the accelerometer, and improving the intermediate-low-frequency disturbance suppression capability in the system. The system is optimized in terms of sensor usage mode; the capability of the accelerometer sensor is utilized fully based on combination of feedback and feedforward; characteristics of large bandwidth, small size, low mass, and low price of the accelerometer are exploited; and the space and cost are saved.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
A Novel AGC Control Method for Circulating Fluidized Bed Boiler
ActiveCN105889910BReduce hysteresisReduced hysteresis effects on fuel volumeFluidized bed combustionApparatus for fluidised bed combustionFluidized bedState space
The invention discloses a novel AGC control method of a circulating fluidized bed boiler. The novel AGC control method comprises the following steps that S1, the step response coefficient of a controlled object is acquired; S2, the state space approximate expression form of the controlled object is acquired; S3, a prediction model of predictive control is acquired; S4, rolling optimization of the control method is carried out; and S5, feedback compensation of the control method is carried out. According to the method, the dynamic adjustment function of primary air on the boiler side on the unit power of the steam engine side in the dynamic process of the circulating fluidized bed boiler is fully utilized, hearth bed materials are fully utilized for energy storage, the lagged effect of the boiler fuel amount is reduced, and the disturbance suppression capacity of a system can be improved through an improved predictive control algorithm.
Owner:SOUTHEAST UNIV
A high-precision controller for ultra-low speed control moment gyro frame servo system
ActiveCN112859612BAddressing the issue of poor estimation performanceImplementing Instantaneous Velocity EstimationAdaptive controlState observerControl engineering
The invention provides a high-precision controller of an ultra-low speed control moment gyro frame servo system. Firstly, the discrete-time system state-space equation is obtained according to the continuous-time system state-space equation of the ultra-low-speed frame servo system, and then the precise estimation of the instantaneous velocity and "lumped disturbance" is realized by designing a double sampling rate expansion state observer, and finally in the velocity loop A compound sliding mode control algorithm based on sliding mode control and disturbance compensation is designed to suppress the "lumped disturbance". The high-precision controller of the ultra-low-speed control torque gyro frame servo system proposed by the present invention not only designs a double sampling rate expansion state observer to solve the estimation performance deterioration of the existing estimation method under the influence of factors such as changes in the model parameters of the ultra-low-speed frame servo system In order to solve the problem, a compound sliding mode control algorithm is also designed to enhance the disturbance suppression ability of the system; starting from two aspects of sensor detection and disturbance suppression, the angular rate control accuracy of the ultra-low speed frame servo system is comprehensively improved.
Owner:BEIHANG UNIV
A Vibration Suppression Method of Tilted Mirror Based on Improved Repeated Controller
ActiveCN108873682BError Attenuation EnhancementImprove disturbance suppression abilityElectric controllersControl engineeringNoise propagation
The invention discloses a vibration suppression method of a tilted mirror based on an improved repetitive controller, which is inserted into a tilted mirror system to suppress the vibration. As a learning strategy, repetitive control can enhance error attenuation and achieve optimal correction to system disturbances when the frequency of system disturbances is known. Aiming at the problem that the traditional repetitive control method will amplify the disturbance at non-periodic frequency, the present invention proposes an improved repetitive controller to optimize the control algorithm, which will not cause other disturbances on the basis of improving the system disturbance suppression ability. Amplification of frequency disturbances. In addition, the method only needs one image sensor, and the cost is low. At the same time, its structure is simple, independent of the model, easy to operate and implement, and does not cause a compromise between vibration suppression and noise transmission.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
A Disturbance Suppression Method Based on Compound Disturbance Observer
ActiveCN109541945BSimple structureImprove frequency band disturbance suppression capabilityAdaptive controlControl systemStabilization control
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Input signal shaping control method in multi-sampling-rate system
PendingCN114265350AReduce unmodeled featuresImprove dynamic accuracyProgramme controlComputer controlHardware architectureControl system
The invention relates to an input signal shaping control method in a multi-sampling-rate system, and the method comprises the steps: converting a step signal inputted by an outer ring into an input signal with a limited frequency band in a limited beat of inner ring sampling through an input signal shaping control method on the basis of a hardware architecture of an existing multi-sampling-rate stable tracking system; high-frequency quantization information caused by low sampling rate of an outer loop is eliminated, and effective signals of a low-frequency band are reserved. By means of the advantage of high sampling rate of an inner loop, a transition process is arranged, an input signal is changed according to an expected form, excitation to an inner loop is reduced, good compromise between rapidity and stability indexes of a control system is achieved, the disturbance suppression capacity of the photoelectric stable tracking system is enhanced, the dynamic characteristic of the system is improved, and the method has wide application prospects.
Owner:LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
Improved dual-port internal model control method suitable for unknown input tracking system
ActiveCN111796515AImprove tracking performanceEnhanced inhibitory effectAdaptive controlControl engineeringControl theory
The invention discloses an improved double-port internal model control method suitable for an unknown input tracking system, which is used for improving the tracking capability and disturbance suppression capability of the unknown input tracking system so as to meet higher-precision tracking control requirements. A standard dual-port internal model method requires input signals of a known system,so that the standard dual-port internal model method cannot be used in an unknown input tracking system. According to the improved dual-port internal model control method provided by the invention, the control effect of the dual-port internal model can still be realized under the condition that the input is unknown; and meanwhile, the tracking capability and the disturbance suppression capabilityof the system are improved. According to the method, the limitation of a standard dual-port internal model control method is broken through, the idea of internal model control is used under the condition that input is unknown, the tracking capacity and disturbance suppression capacity of the system are effectively improved, and the unknown input tracking system can obtain higher tracking precision.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
A digital control method for a two-stage three-phase three-level photovoltaic grid-connected inverter
InactiveCN104300820BLower input impedanceImprove disturbance suppression abilityAc-dc conversionPhotovoltaic energy generationThree levelCapacitance
The invention discloses a digital control method of a two-stage three-phase three-level photovoltaic grid-connected inverter. According to the method, a bus voltage outer ring, a d-axis capacitance current inner ring and a q-axis grid current inner ring are combined to control a three-level inverter. To solve the problem that a bus voltage control dynamic condition is slow in an exiting control mode, inverter grid-connected current and a modulation ratio are used for calculating equivalent bus capacitance current, a bus capacitance current loop is used for controlling SVPWM reference vectors of the inverter, input impedance of the inverter is reduced, inhibiting ability of bus voltage on disturbance caused by changes of power of photovoltaic cells is improved, and the capacitance value of a bus capacitor is lowered. By means of the method, a thin-film capacitor with small capacitance value and high reliability can be adopted in the inverter, and reliability of the inverter is improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
A narrow-band large-value disturbance suppression method based on inertial loop
ActiveCN110209049BSuppress disturbanceHigh stability and precisionAdaptive controlControl systemStabilization control
The invention discloses a narrow-band large-value disturbance suppression method based on an inertial loop, which is used to solve the problem that a higher-precision stable control system cannot be satisfied when there is a narrow-band large-value external disturbance on a stable platform of a control system. This method proposes a narrow-band large-value disturbance suppression method based on the inertial loop on the basis of multiple closed-loop control. The present invention first proposes stability constraints on the design of the feedforward compensation controller starting from the system stability, and on the basis of ensuring the system stability, starts the design from the notch filter, and combines the method of the disturbance observer to propose a forward control method for the external narrow-band large-value disturbance. The design scheme of the feedback compensation controller finally achieves the purpose of effectively suppressing the external narrow-band large-value disturbance, ensuring the stability of the system and effectively improving the stability accuracy of the control system.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
High-precision control method for double-frame mscmg frame system based on adaptive sliding mode compensation
ActiveCN105116934BEliminate the effect of angular rate tracking accuracyGuaranteed closed-loop stabilityMechanical power/torque controlCouplingSystem dynamics model
The invention discloses a dual-frame MSCMG frame system high-precision control method based on self-adaptive sliding mode compensation. Firstly, a dual-frame servosystem kinetic model is established; Input and output inverse mapping of a frame system is derived in a differential geometry approach, and then a a pseudo-inverse system of a frame system is obtained so as to realize kinetic decoupling control of the frame system and eliminate influences by coupling moments between frames; then on the basis of a differential algebraic spectrum theory, a tracking error stable control law is derived so as to enable the frame system to have certain response characteristics and guarantee the stability of the frame system; and finally, on the basis of an RBF neural network and a sliding mode control theory, a self-adaptive sliding mode compensation controller is designed to carry out compensation control on residual coupling, involved toques and nonlinear friction to enhance the disturbance inhibition ability of the frame system to realize high-precision angular rate tracking control of the dual-frame system. The method of the invention is simple and is simple to implement. The method is applicable to high-precision decoupling control of the dual-frame Magnetically Suspended Control Moment Gyroscope frame servosystem.
Owner:BEIHANG UNIV
A Design Method of Dual-Filter Disturbance Observer for Non-Minimum Phase Systems
ActiveCN113093551BImprove disturbance suppression abilitySuppress disturbanceAdaptive controlControl engineeringStability constraints
The invention discloses a double-filter disturbance observer design method for a non-minimum phase system, which is used to solve the problem that the traditional disturbance observer method is unstable in the non-minimum phase system and cannot suppress disturbance. The present invention introduces a forward model, and provides a new disturbance observer frame structure and a double filter design scheme. The invention starts from the frame structure of the new disturbance observer, carries out stability constraints on the double filter, and analyzes the tracking characteristics and disturbance suppression characteristics of the system under the premise of ensuring the stability of the system. The filter one in the present invention adopts the design of the original closed-loop controller, and the filter two is designed according to the filter one, and realizes the same performance as the filter one. On the basis of not changing the tracking characteristics and stability of the closed-loop non-minimum phase system, the invention can use any filter alone to double the disturbance suppression capability of the system, and use dual filters at the same time to improve the disturbance suppression capability of the system. twice as high.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
A Disturbance Decoupling and Suppression Method Based on Gyroscope and Precision TV Signal Fusion
ActiveCN113358114BAvoid the problem of low frequency driftAvoid the problem of insufficient high-frequency sampling abilityNavigation by speed/acceleration measurementsAdaptive controlGyroscopeClosed loop
The invention discloses a disturbance decoupling and suppression method based on the fusion of gyro and fine TV signals. The azimuth axis and the pitch axis of the photoelectric tracking system are respectively loaded with angular rate gyroscope A and angular rate gyroscope E, and the gyroscope signal is used for coarse The velocity loop of the tracking loop is closed, in addition, the high frequency part of the decoupling gyro signal is the high frequency part of the disturbance signal. The precision TV is installed inside the rack, and the target deviation is detected by the fast mirror. The precision TV signal is used for the closed loop of the precision tracking loop. At the same time, the low-frequency signal of the precision TV is decoupled and the decoupled gyro signal is fused and fed forward to the precision tracking loop, which can improve the performance. The ability of the system to suppress disturbances, but does not affect the system's target tracking ability, to achieve precise and stable control. The present invention does not need to add additional sensors, and does not need to establish an equivalent model of the control object. The structure is simple, which is beneficial to the realization of the project.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Design method of double-filter disturbance observer of non-minimum phase system
ActiveCN113093551AImprove disturbance suppression abilitySuppress disturbanceAdaptive controlControl engineeringStability constraints
The invention discloses a design method of a double-filter disturbance observer of a non-minimum phase system, and is used for solving the problems that the system is unstable and disturbance cannot be suppressed in the non-minimum phase system in a traditional disturbance observer method. According to the method, a forward model is introduced, and a new disturbance observer frame structure and double-filter design scheme is given. Starting from the frame structure of the new disturbance observer, stability constraint is carried out on the double filters, and the tracking characteristic and the disturbance suppression characteristic of the system are analyzed on the premise that the stability of the system is guaranteed. The first filter adopts the design of an original closed-loop controller, the second filter is designed according to the first filter, and the performance of the second filter is the same as that of the first filter. On the basis of not changing the tracking characteristic and the stability of the closed-loop non-minimum phase system, the disturbance suppression capability of the system can be doubled by independently using any filter, and the disturbance suppression capability of the system can be doubled by using the double filters at the same time.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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