69 results about "Power system stability control" patented technology

The invention discloses a design method of a stabilizer of a power system in the technical field of stable control of the power system. The method comprises the following steps: selecting a variable corresponding to maximum feedback gain from a full-state feedback gain matrix of the system as a primary variable; and adjusting the feedback gain of the primary variable for realizing the control of damping of the system, and setting a zero point of the system in a matching way for adjusting oscillation mode. By adopting the method, low-frequency oscillation of the system is effectively inhibited, the problem that the overall control effect of the stabilizer is affected due to unreasonable pole configuration of a state variable observer when adopting the full-state feedback control is simultaneously avoided, and the good control effect is realized.

The invention relates to a system control method for a dynamic reactive power compensation device and belongs to the technical field of grid safety and stable control of a power system. The method includes: according to voltage and current of the dynamic reactive power compensation device accessed to the power transmission grid, switching states of parallel compensation equipment in a substation and manual setup of operators, quickly calculating reactive power requirement values of each functional mode of the dynamic reactive power compensation device, and determining which output of the functional modes can be selected by the dynamic reactive power compensation device to serve as reactive power reference instruction values. The method has the advantages of distinct control structure, simplicity in implementation and the like and overcomes the defect of single control function of a traditional control method. In addition, the control method can be applied to stable control of the power system, and voltage stability and dynamic stability of the power transmission grid can be improved.

The invention provides a power grid out-of-step disconnecting control system and method, and belongs to the field of power system stability control. Based on out-of-step judgment of a regional power grid, an out-of-step situation of the regional power grid is judged step by step, so that the invention provides more comprehensive consideration; based on out-of-step judgment of a large-area power grid, the influence of out-of-step of the regional power grid is considered, and the possibility of power failure of a local power grid is reduced; furthermore, the out-of-step judgment method provided by the invention effectively locates a line where an out-of-step center is located, and performs a disconnecting operation on the line where the out-of-step center is located; when a system generates serious out-of-step oscillation, the power grid is quickly disconnected, the disconnecting measure is quickly and reasonably utilized in a first period of the out-of-step, and the out-of-step fault is prevented from spreading over the whole power grid; by inducing a wide-area measurement technique and utilizing a PMU device, electric data of the power grid is measured in real time on-line, communication is performed by utilizing the optical fiber communication technology, and a main grid control center judges the out-of-step of the power grid, controls the whole power grid and ensures that the power grid is reliably disconnected when the power grid occurs the out-of-step.

The invention discloses an input signal equivalent based accelerating power type PSS (packet switching service) parameter tuning method, which belongs to the field of stability control on power systems. The method comprises the following steps: on the premise of obtaining phase-frequency characteristics between input signals and electromagnetic torques of an excitation control system of a generator set desired to be configured a PSS, firstly, calculating and tuning parameters of a lead-lag link which double input signals jointly pass; then, tuning parameters of each link which a delta Omega signal individually passes; and finally, equating a delta Pe signal into an input signal with a phase same as that of the delta Omega signal, and tuning parameters of each link which the signal individually passes. The method disclosed by the invention is mainly used for enhancing the damping of a system, inhibiting the low-frequency oscillation, and improving the small disturbance stability and dynamic stability of the system.

An intelligent optimizing method of power system stabilizer parameter in the field of power system stability control technology is provided, comprising: step one, encoding each parameter by using quantum bit angle limited in the first quadrant, forming the first group, and confirming the maximum iterative times; step two, generating random numbers between [0 to 90 degrees] aiming at each quantum bit angle in chromosome of the present group; processing collapsing operation to form binary serial according to the size relation of the random number identical quantum bit angle, converting the binary serial to the decimal power system stabilizer parameter; step three, calculating the adaptation value of the chromosome and recording the historical optimal binary solution and overall optimal binary solution of the chromosome; step four, using the particle-like group optimizing method to update the quantum gate; step five, if convergent or reaching the maximum iterative times, the calculation stops and the parameter is outputted; otherwise, returning to step two. This invention has faster convergent speed and greater optimizing result.

The invention discloses a low-frequency and low-voltage load reduction control method considering the comprehensive load regulation characteristic, belonging to the technical field of stability control of a power system. The instantaneous load-to-ground admittance Y(t) and the sensitivity R(t) of the instantaneous load-to-ground admittance to frequency change of a corresponding bus are calculated in real time by measuring local state quantity information such as bus voltage, frequency, active power and reactive power in real time with a low-frequency and low-voltage load reduction control device which is arranged at a load bus, thereby obtaining a low-frequency and low-voltage load reduction control sensitive index S(t). Compared with the conventional low-frequency and low-voltage load reduction control method, the method has the advantages that the frequency regulation characteristic of the active power and the reactive power of the load and the comprehensive effect of the voltage regulation characteristic can be effectively considered in action logic of the device to realize the control sensitivity recognition for different load nodes, so that the load reduction control effect is improved, and the load reduction control cost is reduced.

The invention relates to an electric power system time-lag PID damping controller and belongs to the technical field of electric power system stable control. The wide-area PID damping controller with the large-range-change time-lag self-adaptive ability is designed for the low-frequency oscillation problem and the PMU signal time-lag large-range-change phenomenon occurring in the regional power grid interconnection process of a wide-area electric power system, and a selecting method for PID control parameters is provided. The wide-area PID damping controller comprises a wide-area measuring signal preprocessing module, a time-lag comparator, a proportional (P) link, an integral (I) link, a differential (D) link, a PID parameter storage module, a PID parameter selecting reset module and an output amplitude limiting link. According to the strategy for actual time-lag PID parameter online selection, PMU feedback control signal time lag is allowed to change within the large range, and the designed controller is simple in structure, and easy to realize in an engineering mode.

The invention discloses a PSCAD (Power System Computer Aided Design)-based electric complex torque coefficient scanning method, and belongs to the field of stable control of power systems. The method comprises the following steps: (1) loading an electric complex torque coefficient scanning module onto electromagnetic transient software; (2) inputting an electric parameter and a scanning parameter; (3) generating small-amplitude turbulence according to the scanning frequency, and applying the turbulence to the mechanical torque of a rotor specific to the power system which enters a stable state already; (4) extracting an electromagnetic torque signal of a generator and the angular speed response of the rotor after the system enters the stable state once again, and calculating an electric complex torque coefficient; (5) judging whether the scanning frequency surpasses a cut-off frequency or not, if the scanning frequency does not surpass the cut-off frequency, adding a scanning step length on the basis of the frequency, returning to the step (3), and scanning the electric complex torque coefficient of a next frequency point; if the scanning frequency surpasses the cut-off frequency, stopping calculation and finishing scanning. By adopting the PSCAD-based electric complex torque coefficient scanning method, automatic scanning of an electric complex torque coefficient method on time domain simulation software is realized, a simulation method is quick, and the cost is low.

The invention discloses a parameter tuning method of a power system stabilizer and belongs to the technical field of stable control of a power system. The power system stabilizer is designed aiming at a classic small interference four-order single machine infinite bus system model. A lead link, a resetting link and an amplification link are selected as master variables and a certain effective range is set; the master variables are optimized by utilizing a particle swarm algorithm; meanwhile, an inertia weight linear change manner is adopted in order to increase the fast convergence of the algorithm. By adopting the method disclosed by the invention, damping is effectively increased and low-frequency oscillation of a system is inhibited; meanwhile, the defect that the effectiveness of the parameters of the stabilizer cannot be ensured is overcome.

The invention discloses a damping adaptive control system based on Youla parameterization and a control method. The damping adaptive control system comprises a data read-in subsystem, a self-adaptive control decision subsystem and a result output subsystem which are sequentially connected, wherein the self-adaptive control decision subsystem comprises a system Youla parameterization module and a controller Youla parameterization module, the system Youla parameterization module determines an operation state of a dynamic electric power system through updating system Youla parameters, the controller Youla parameterization module realizes online update of Youla parameters of a controller according to the updated system Youla parameters, and the self-adaptive controller which is suitable for the operation state of a present electric power system is acquired. The damping adaptive control system solves problems of lack of validity and robustness existing in a wide area damping control system in the prior art under an unknown disturbance condition.

The invention belongs to the technical field of on-line stimulation for third-defense-line control measures of a power grid, and more specifically relates to a multi-round low-frequency load reductionsimulation calculation method for the power grid. The method specifically comprises a first round and a second round. The first round includes the steps of first, calculating a frequency curve by using transient stability calculation, obtaining high-precision frequency offset and the duration after the power grid breaks down, and matching with a low-frequency load reduction strategy to reach loadreduction requirements of the next round; second, calculating the load capacity should be shed according to the low-frequency load reduction strategy, configuring the load capable of being shed whenload shedding is performed, and preferentially removing the interruptible load; and third, calculating the power flow again, and entering the second round after the convergence. In the second round, the operation and calculation process in the first round is repeated. The method realizes modeling for three defense lines in an on-line calculation program of the power grid for the first time, achieves a function of multi-round low-frequency load reduction and a function that the three defense lines are stably controlled by an electric power system, and improves the calculation accuracy of the simulation program when the power grid breaks down.

The invention relates to the technology of power system stable control, and specifically relates to an emergency control method for an asynchronous networking sending end system for processing a DC fault. The method comprises the following steps: 1, predicting the maximum deviation of the system transient frequency of the asynchronous networking sending end system under the DC fault through curved surface fitting, and taking the maximum deviation as the criterion for starting the emergency control; 2, solving a generator tripping quantity needed by emergency control according to a power balance control principle and the predicted maximum difference of the transient frequency of the asynchronous networking sending end system, carrying out the generator tripping priority ordering according to an electrical distance between a power supply and a DC current converter with an emergency power reduction fault, and then carrying out the effective generator tripping. The method provided by the invention can predict the maximum deviation of the system at the earlier stage of the DC fault, and the corresponding measures are taken, thereby preventing the system frequency from exceeding a critical value to enter an emergency state under the fault condition, effectively increasing the stability margin of the system, and maintaining the reliable operation of the system.

The invention discloses a light storage system power slide control method based on second order cone programming and belongs to the technical field of power system stability control. The method comprises the steps of reading data, namely the integrated economy index, the electricity generation cost factor, the environment pollution index and the one-time energy waste index of each energy storage unit; establishing optimized modules, namely an integrated economy index model, a target function model, a power balance restraining model and a power limit restraining model are established; respectively carrying out second order cone programming processing on the target function model, the power balance restraining model and the power limit restraining model; solving and optimizing the models with a second order cone programming solving method, computing electricity generation power of each electricity generation unit, and outputting power according to the computed electricity generation power by each electricity generation unit. According to the method, fluctuating of photovoltaic output power can be well restrained, and a power distribution strategy with the best economy is provided.

The invention discloses a self-adaptive modeling method and system for a safety control strategy of a power system sent by a power supply cluster. The method comprises the following steps of S1, carrying out network topology analysis on the power system sent by the power supply cluster, S2, generating a safety control strategy table according to a topology analysis result, and S3, generating a safety control E file according to the topology analysis result and the safety control strategy table. According to the topology structure of an existing power grid, self-adaptive modeling of the power supply cluster safety control strategy can be achieved, complex safety control strategy re-modeling work caused by changes of the topology structure and the operation mode of the power grid is avoided,and the automation level of stability control and online safety stability analysis of a power system is improved.

The invention discloses a steady-running-state intelligent tour-inspection system. The steady-running-state intelligent tour-inspection system comprises a master station and a plurality of power system stability control devices, wherein the master station is arranged in a dispatching center of an electric power company or an office of a relay protection position; the power system stability controldevices are separately arranged in different transformer substations; and the master station and the power system stability control devices communicate with each other through an electric power datanetwork or a dedicated telephone network. By the system, the reliability and accuracy of the tour-inspection system can be improved, and the level of automation is improved. The invention further discloses a control method of the steady-running-state intelligent tour-inspection system. The control method of the steady-running-state intelligent tour-inspection system comprises the following steps:mounting a power system stability control master station at first; deploying a steady-running-state intelligent tour-inspection system on the basis of the power system stability control master station; guiding out a constant value and information of a soft pressure plate and a hard pressure plate from Relay CAC; and storing a reference value of a tool by using a constant value ratio, and startingan automatic tour-inspection tool, or starting an artificial tour-inspection tool to carry out tour-inspection.

The invention discloses a wide area damping control real-time data processing method, and belongs to the field of the power system stability control technology. The method includes the steps that preprocessing is carried out according to data uploaded by a PMU and an executive device; the preprocessed data are stored in a real-time database, and section alignment is conducted; latest real-time section data are taken out for input abnormal detection, selection judgment, synchronization judgment and output abnormal detection; control logic calculation is carried out on data meeting control start conditions, intermediate data generated in the calculation process are stored, a control command is issued to a wide area damping control executive device, and therefore wide area damping control can be conducted on an electric system. According to the method, a wide area damping control system can be more reliable, flexible and practical.

An intelligent optimizing method of power system stabilizer parameter in the field of power system stability control technology is provided, comprising: step one, encoding each parameter by using quantum bit angle limited in the first quadrant, forming the first group, and confirming the maximum iterative times; step two, generating random numbers between [0 to 90 degrees] aiming at each quantum bit angle in chromosome of the present group; processing collapsing operation to form binary serial according to the size relation of the random number identical quantum bit angle, converting the binary serial to the decimal power system stabilizer parameter; step three, calculating the adaptation value of the chromosome and recording the historical optimal binary solution and overall optimal binary solution of the chromosome; step four, using the particle-like group optimizing method to update the quantum gate; step five, if convergent or reaching the maximum iterative times, the calculation stops and the parameter is outputted; otherwise, returning to step two. This invention has faster convergent speed and greater optimizing result.

Disclosed is a power system stability control strategy comprising an interruptible load and new energy. The power system stability control strategy comprises the following steps that: 1) new energy and the interruptible load are connected in a wind power field of a normal power system; 2) under the normal condition, the new energy gives out active power and reactive power, and the interruptible load consumes active power; 3) in a fault period, voltage and frequency fluctuations are detected, and the active power and bus voltage frequency from the wind power plant are detected, and the rotational inertia of the current system is calculated; and 4) the real-time active power vacancy, a formula which is as shown in the specification, of the detection system is detected, and the reached frequency extreme value f is calculated, so that system frequency stability level is improved. Compared with the traditional analysis method, the method has the advantages that the system frequency stability level can be effectively judged; due to the fact that a monitoring module is only introduced into an original monitoring system, the control method is can perform engineering implementation moreeasily. The analysis method has the characteristics of being simple in calculation, accurate in result, easy to implement, high in engineering application value and the like.

The invention discloses a PSCAD (Power System Computer Aided Design)-based mechanical complex torque coefficient scanning method, and belongs to the field of stable control of power systems. The method comprises the following steps: (1) loading a mechanical complex torque coefficient scanning module onto electromagnetic transient software; (2) inputting a generator parameter and an axis coefficient, and establishing an axis motion equation; (3) inputting a scanning parameter; (4) bringing the scanning frequency into the axis motion equation, calculating a mechanical complex torque coefficient under the frequency, and separating the mechanical complex torque coefficient into a real part serving as a mechanical elastic coefficient and a virtual part serving as a mechanical damping coefficient; (5) judging whether the frequency surpasses a cut-off frequency or not, if the frequency does not surpasses the cut-off frequency, adding a scanning step length to the frequency, returning to the step 4), and calculating the mechanical complex torque coefficient of a next frequency point; if the frequency surpasses the cut-off frequency, stopping calculating and finishing scanning. By adopting the PSCAD-based mechanical complex torque coefficient scanning method, the mechanical complex torque coefficient of a generator to be researched and developed on a PSCAD platform can be scanned automatically, a high scanning speed and an accurate result are achieved, and research of the problem of subsynchronous oscillation is facilitated.

The invention brings forward an active splitting strategy space reduction method and system based on trend tracking. The method comprises the following steps: at an online monitoring phase, according to acquired real-time operation data of a power system, calculating electric energy supplied by each generator to the load of each node, and analyzing ownership of non-generator nodes under a current trend; and at a real-time monitoring phase, dividing all the generators into I coherent generator groups, according to the ownership of the non-generator nodes under the current trend, analyzing ownership of any one non-generator node under a current coherent condition, and determining the non-generator nodes belonging to islands where the corresponding coherent generator groups are disposed. The method provided by the invention can effectively reduce the search space of a splitting strategy, greatly improves the search speed of an active splitting strategy, reserves sufficient time for stable control of the power system, and accordingly guarantees the stability of the power system and the power supply continuity of the loads.

The invention discloses a power system automatic operation method and device based on physical information and deep reinforcement learning. The method comprises the following steps: setting a neural network structure, parameters, a state space and a selectable action space required by reinforcement learning training, constructing a deep Q learning intelligent agent, and predicting automatic actions by minimizing frequency and severity of line faults; directly using physical information of a power system as a known limit of training, reducing training data, and shortening training time; and designing a reward function for optimization, training to select different actions to achieve the maximum reward, and searching for the optimal automatic operation. According to the invention, characteristics of the physical information are combined, optimization control is carried out on power transmission lines and transformer substation topology of the power system based on a DQN algorithm, economy and effectiveness are both considered; and the stable control of the power system can be carried out in real time under the condition of less data.

The invention belongs to the technical field of power system stability control, and relates to a method for preventing and controlling the transient stability of a power system based on distributed reinforcement learning. A prevention and control decision problem considering transient stability and operation cost is modeled as a Markov decision process, firstly, d * m initial operation states are generated based on load flow calculation, then an action Actor network and an action value Critic network are trained based on the initial operation states and a distributed depth deterministic strategy gradient technology, and a transient stability prevention and control strategy of the power system is obtained according to the state estimation data and the action Actor network. According to the method, effective prevention and control measures can be rapidly provided, the electric power system is adjusted to be in a safe state, the electric power system can resist expected faults, the control measures have the operation cost close to the optimal cost, and therefore the operation safety and economical efficiency of the electric power system are guaranteed.

The invention discloses a method for maximizing electrical damping, a damping controller and applications, and belongs to the field of power system stability control. The method comprises the following steps: acquiring active current i[d] and reactive current i[q] output by a STATCOM in a phase-locked loop coordinate system; transforming the active current i[d] and the reactive current i[q] to obtain active current i<s>[d] and reactive current i<s>[q] in the rotor coordinate system; and according to the active current i<s>[d] and the reactive current i<s>[q], when STATCOM injection current flows into a generator, obtaining the amplitude and phase change expressions caused by the branch of apower grid; according to the amplitude and phase change expression, obtaining electrical damping when STATCOM injects suppression current to asynchronous machine; and obtaining the maximum amplitude of the electrical damping and compensating the phase in the electrical damping to obtain the target electrical damping. By taking full advantage of the limited capacity of STATCOM, the cost is reduced, the maximum electrical damping is provided, and the subsynchronous resonance caused by the series compensation connection of the thermal power generating unit and the power grid is well suppressed.

The invention discloses a wide area damping control real-time data processing method, and belongs to the field of the power system stability control technology. The method includes the steps that preprocessing is carried out according to data uploaded by a PMU and an executive device; the preprocessed data are stored in a real-time database, and section alignment is conducted; latest real-time section data are taken out for input abnormal detection, selection judgment, synchronization judgment and output abnormal detection; control logic calculation is carried out on data meeting control start conditions, intermediate data generated in the calculation process are stored, a control command is issued to a wide area damping control executive device, and therefore wide area damping control can be conducted on an electric system. According to the method, a wide area damping control system can be more reliable, flexible and practical.

The invention provides an active power distribution network interconnection system stability control method considering new energy access, comprising the following steps: firstly, the efficiency degree of the function of a power system stability controller is calculated to obtain an optimal installation place of the controller; secondly, the controller is divided into two layers, the first layer is a local power system stability controller which is used for suppressing local oscillation, is designed on a strong correlation unit of the controller and only feeds back a local unit signal, and thesecond layer is a remote interconnection power system stability controller which is arranged on the strong correlation unit of the controller and aims at a system interconnection oscillation mode; and finally, a local power system stability controller and a remote interconnected power system stability controller are designed. The active power distribution network interconnection system stabilitycontrol method considering new energy access has the beneficial effect that the low-frequency oscillation of a polymorphic energy utilization interconnection system is suppressed and the stable operation level of an active power distribution network system is improved.

The invention discloses a light storage system power slide control method based on second order cone programming and belongs to the technical field of power system stability control. The method comprises the steps of reading data, namely the integrated economy index, the electricity generation cost factor, the environment pollution index and the one-time energy waste index of each energy storage unit; establishing optimized modules, namely an integrated economy index model, a target function model, a power balance restraining model and a power limit restraining model are established; respectively carrying out second order cone programming processing on the target function model, the power balance restraining model and the power limit restraining model; solving and optimizing the models with a second order cone programming solving method, computing electricity generation power of each electricity generation unit, and outputting power according to the computed electricity generation power by each electricity generation unit. According to the method, fluctuating of photovoltaic output power can be well restrained, and a power distribution strategy with the best economy is provided.