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38results about How to "Improve on-grid performance" patented technology
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Wind collecting vertical type wind power generating system
InactiveCN101943127AEliminate dead endsReduce deformationWind motor controlWind motor assemblyUnit systemChange control
The invention relates to a wind collecting vertical type wind power generating system which comprises a wind power system, a vertical type speed increaser, a vertical type generator and an excitation grid-connected control system, wherein the wind power system is connected with the speed increaser and the generator by a chain coupling; the generator is controlled by the excitation grid-connected control system; the wind power system is in a box frame structure and comprises a fan blade system and a wind collecting and protecting system; the upper end and the lower end of a box frame are respectively provided with an upper shed top and a lower shed plate; the wind collecting and protecting system comprises a plurality of wind collecting plates which are distributed at four sides of the box frame and hydraulic drive equipment; the upper shed top, the lower shed plate and the wind collecting plates are connected to form a wind tunnel box type wind collecting body; the generator works in a multi-winding pole-changing control way; and the generator and the speed increaser are installed on the ground. The invention has the advantages of small size, low installation, maintenance and transportation cost, high wind power utilization ratio and wind field land utilization ratio, stable performance, high storm wind resistance and favorable power generating quality and grid-connected performance, can form a high-power wind power generator unit system and is suitable for various weather and geographic environments.
Owner:HARBIN POWER VERTICAL WIND POWER EQUIP ENG TECH RES CENT +2
Micro-grid voltage disturbance control method with voltage harmonic compensation
ActiveCN104836237AImprove control abilityImprove stabilityAc network voltage adjustmentReactive power compensationDisturbance voltageHarmonic
The invention discloses a micro-grid voltage disturbance control method with voltage harmonic compensation, and belongs to the field of electrical technology. According to the invention, droop control, proportional resonance control and harmonic compensation control are mainly employed for a plurality of inverters in parallel connection. When a micro-grid voltage fluctuates, reactive power is uniformly divided through droop control, and a disturbance voltage is adjusted. Also, the high-order harmonic wave of the micro-grid voltage can be extracted through detection, the first-order elimination is carried out through proportional resonance control, and then the second-order elimination is carried out through the harmonic compensation control. Finally, the above results are outputted in a voltage mode through a PWM control inverter. The method can effectively improve the operation characteristics of an intermittent and unstable power supply in real time, also can adjust the voltage disturbance and the harmonic voltage, achieves the effects of voltage stabilization and voltage harmonic elimination, improves the capability of micro-grid regulation and control, improves the stability and reliability of the micro-grid operation, and improves the grid-connected capability of a micro-grid.
Owner:NORTHEASTERN UNIV
Multi-objective optimal control method for doubly-fed fan participating in system frequency modulation
InactiveCN110417032AGuaranteed stabilityEnsure safetyPower oscillations reduction/preventionElectricityOptimal control
The invention provides a multi-objective optimal control method for a doubly-fed fan participating in system frequency modulation. The method comprises the steps: rotation speed recovery of a wind power generator based on the maximum power tracking strategy; design a variable power curve; and performing parameter optimization of the variable power curve based on a Pareto algorithm. According to the technical scheme, the multi-objective optimization of the rotating speed recovery process can be realized, the secondary fall of the frequency and the rotating speed recovery time can be reduced, the operation stability of the wind power generation system can be improved and the operation life can be prolonged.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Optimal dispatching method and system of distributed photovoltaic cluster
InactiveCN109638873AReduce lossLow running costLoad forecast in ac networkSingle network parallel feeding arrangementsComputation complexityParallel computing
The invention provides an optimal dispatching method and system of a distributed photovoltaic cluster. The optimal dispatching method comprises the steps of calculating an optimal dispatching model, which is built in advance, by a master station to obtain a short-time scale optimal dispatching result, and issuing the short-time scale optimal dispatching result to a sub-station; receiving the short-time scale optimal dispatching result issued from the master station by the sub-station, and allocating the short-time scale optimal dispatching result to each photovoltaic field station; receiving an allocation result of the sub-station by the photovoltaic field station, and performing calculation to obtain a short-time scale dispatching instruction by combining the allocation result and each photovoltaic unit in the photovoltaic field station; and executing the short-time scale dispatching instruction by the photovoltaic unit to obtain an execution result. By the optimal dispatching method,the running cost and the circuit loss are reduced, and the distributed photovoltaic grid-connected capability and the control result are improved; and by the optimal dispatching method, the control dimensionality and the calculation complexity are effectively reduced, dispatching effectiveness and reliability are improved, a long-time scale optimal dispatching result is updated according to the short-time scale optimal dispatching result, and dispatching accuracy and effectiveness are improved.
Owner:CHINA ELECTRIC POWER RES INST +2
Wind power plant optimizing dispatching method for reducing mechanical loss of wind generating sets
ActiveCN103915855AReduce adverse effectsImprove on-grid performanceForecastingSingle network parallel feeding arrangementsElectricityElectric power system
The invention belongs to the technical field of wind power plants and discloses a wind power plant optimizing dispatching method for reducing mechanical loss of wind generating sets. The method includes the steps that firstly, numerical simulation is carried out under different wind conditions and different loading conditions to acquire the frequency of cyclic loading applied on different major parts under the different loading conditions; secondly, the cycle frequency generated when materials of the major parts are damaged under the different loading conditions is worked out, and then unit relative damage values of the major parts under the different loading conditions are acquired based on the linear cumulative damage theory; thirdly, optimizing calculation is carried out on combination and dispatching of wind generating sets in a wind power plant through the particle swarm optimization algorithm to obtain a combination of the wind generating sets in the wind power plant where mechanical damage of the major parts of the wind generating sets is smallest. According to the method, through reasonable combination and dispatching of the wind generating sets, output power is guaranteed, adverse effects of start, stop, switching and the like of the wind generating sets on the service life of the wind generating sets are reduced, and the operating cost of an electric system is reduced.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Method for improving adaptability of distributed photovoltaics to AC/DC hybrid microgrid
ActiveCN108390413AImprove adaptabilityImprove on-grid performanceSingle network parallel feeding arrangementsPhotovoltaic energy generationCapacitanceLoop control
The invention provides a method for improving adaptability of distributed photovoltaics to an AC / DC hybrid microgrid. The method includes the steps of determining double closed loop control parametersof a distributed photovoltaic grid-connected system under a strong power grid condition, the double closed loop control parameters including a proportional control factor of a PI controller, an integral control factor of the PI controller and a capacitance current feedback factor; realizing virtual shunt impedance based on output impedance under a weak power grid condition; and determining valueranges of the parameters and shunt inductance of a phase lag link after system compensation. The method provided by the invention ensures that the system can stably run under the strong power grid condition, and at the same time, can satisfy requirements of a stable state and a transient state; and improves adaptability of the system to a weak power grid, i.e., through double closed loop parametersetting under the strong power grid condition, the method provided by the invention ensures grid connection performance under the strong power grid condition, and a method of lag link compensation and shunt inductance after adoption of virtual shunt impedance is employed to improve adaptability of the system to the weak power grid.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
Solar thermal generation and wind power generation complementary operation system
InactiveCN106300406AImprove economyStrong process controllabilitySingle network parallel feeding arrangementsWind energy generationElectricityThermal energy
The invention provides a solar thermal generation and wind power generation complementary operation system. The system comprises a wind power generation subsystem, a wind power heat supply subsystem and a solar thermal generation subsystem, the wind power generation subsystem is used for converting wind energy to electric energy and sending the electric energy to a power grid or the wind power heat supply subsystem, the wind power heat supply subsystem is used for converting electric energy initiated by the wind power generation subsystem to heat energy and sending the heat energy to the solar thermal generation subsystem, and the solar thermal generation subsystem is used for converting the heat energy to electric energy and sending the electric energy to the power grid. Compared with the prior art, according to the solar thermal generation and wind power generation complementary operation system, the electric energy generated by wind power generation is stored by employing the heat storage capability of solar thermal generation, the controllability of the wind power is improved, the wind-power grid connection performance is enhanced, and fluctuation of the wind power can be suppressed.
Owner:CHINA ELECTRIC POWER RES INST +1
Wind generating set
InactiveCN103967721ALow costMeet the grid-connected requirements of low voltage ride throughWind motor componentsImpellerCoupling
The invention relates to a wind generating set. The wind generating set comprises an impeller (1), a main shaft (2), a gearbox (3), and a coupler (4), a generator (6) and a main machine frame (7) used as a supporting piece. The impeller (1) drives the main shaft (2) to rotate. The gearbox (3) is installed on a transmission chain of the main shaft (2) and is connected with the generator (6) through the coupler (4). The wind generating set further comprises a control device (50) and a speed rotation measuring device (9). An inner gear ring of a gear transmission mechanism in the gearbox (3) is connected with the control device (50) through an auxiliary transmission device. When the rotation speed measuring device (9) detects that the rotation speed of the main shaft (2) changes, the control device (50) controls the inner gear ring of the gear transmission mechanism to change the rotation speed and / or the rotation direction according to the change of the rotation speed of a sun gear in the gear transmission mechanism through the auxiliary transmission device, so that the transmission ratio of the gear transmission mechanism is adjusted; in this way, the application area of a draught fan is expanded, and the overall cost of the wind generating set is reduced.
Owner:张东升
Frequency control method considering kinetic energy throughput capacity of double-fed fan
PendingCN111725847AActive controllableDoes not cause speed instability problemsSingle network parallel feeding arrangementsEnergy storageFrequency stabilizationControl engineering
The invention particularly relates to a frequency control method considering the kinetic energy throughput capacity of a doubly-fed fan. Frequency control is carried out when frequency deviation is positive and negative; when the frequency deviation is positive, redundant active power is absorbed from a power grid and stored in a fan, so active power redundancy of the system is reduced; when the frequency deviation is negative, kinetic energy is effectively released into the power grid from a rotating part of the fan, and the active power shortage of the system is compensated; therefore, active frequency control of the doubly-fed wind generating set is realized, frequency stability is improved, and the response time is provided for a synchronous generator to participate in system frequencymodulation. Different frequency control parameters are adopted to provide system frequency support capability; the proposed frequency control parameters can make full use of the capacity of the fan for storing and releasing the rotational kinetic energy to perform frequency control; when the frequency deviation is negative, the proposed control parameters can prevent the fan from stalling; and when the frequency deviation is positive, the provided control parameters can avoid excessive starting pitch angle control, and a problem of mechanical fatigue of the fan is reduced.
Owner:NANTONG UNIVERSITY
Hydraulic wind power generation device
InactiveCN110439749AExpand the cut-out and cut-in range of wind speedImprove wind utilization efficiencyWind motor controlWind energy with garvitational potential energyFuel tankHydraulic pump
The invention provides a hydraulic wind power generation device. The wind power generation device is provided with a control module and an energy storage device capable of storing energy through a high pressure working medium; two or more energy storage pumps are driven by fan blades of the wind generation device through a gearbox; when the working medium is oil, the energy storage pumps are hydraulic pumps, and when the hydraulic pumps are driven, the oil in an oil tank is pumped into the energy storage device to form high pressure oil for energy storage; the hydraulic pumps comprises a largedischarge capacity hydraulic pump and a small discharge capacity hydraulic pump; clutchs capable of enabling the hydraulic pumps to be disconnected with the fan blades are connected to all the hydraulic pumps; and the control module controls the number and the discharge capacity of the hydraulic pumps driven by the fan blades through the clutches according to the current wind speed, so that the wind speed cut-in and cut-out range of a fan of the wind power generation device is enlarged. According to the wind power generation device, the wind speed cut-out and cut-in range can be enlarged, theinstallation is convenient, and the power output is stable.
Owner:JIMEI UNIV +1
Grid-connected control method of single-phase photovoltaic grid-connected system
InactiveCN106130070ASimple control processEasy to implement control strategySingle network parallel feeding arrangementsPhotovoltaic energy generationReference currentFiltration
The invention discloses a grid-connected control method of a single-phase photovoltaic grid-connected system, and relates to the technical field of power generation equipment manufacturing. A reference voltage and a network voltage are input from the input end of a PI control module, and a grid-connected current reference amplitude is output from the output end of the PI control module after PI calculation; a sampling voltage obtained from a photovoltaic cell is multiplied with the phase angle of a phase-locked loop in the phase-locked loop to obtain a grid-connected inverter reference current, the current reference amplitude, the grid-connected inverter reference current and the inverter sampling current are input to a current hysteresis control module respectively, the grid-connected inverter reference current and the inverter sampling current perform difference calculation in the current hysteresis control module, an error measurement value controls the output of an inverter through a PWM generator, the output of the inverter becomes stable sine-wave current output after filtering of a filtration module to be grid-connected, and the network voltage is obtained from the output end of the filtration module. The grid-connected control method can solve the problem that an existing grid-connected control technology is complicated in control process and poor in grid-connected effect.
Owner:GUANGXI UNIVERSITY OF TECHNOLOGY +1
A wind farm power controller
InactiveCN106505613BRealize closed-loop controlStrong process controllabilitySingle network parallel feeding arrangementsReactive power adjustment/elimination/compensationPower control systemTransformer
Disclosed is a wind power plant power controller. The power controller comprises a central processing unit, a power supply module, a power grid detection module, a communication module, an abnormality processing module, an active frequency control module and a reactive voltage control module, wherein the central processing unit is connected with the power supply module, the power grid detection module, the communication module, the abnormality processing module, the active frequency control module and the reactive voltage control module separately; the wind power plant power controller is mounted in a booster station, and the power controller, a wind turbine, a reactive compensation apparatus, a booster station monitoring system, a wind power plant monitoring (SCADA) system and a dispatching center main station form a wind power plant power control system network; and the wind power plant power controller receives active and voltage instructions from the dispatching center main station or underground in a communication way, performs unified cooperative control on the wind turbine, the reactive compensation apparatus, and a transformer gap gear, performs active power and reactive power regulation, and realizes stable control on frequencies and voltages.
Owner:CORONA WIND EQUIP BEIJING CO LTD +1
System and control method for realizing cooling medium exchange in range-extended vehicle
ActiveCN113119686BImprove the heating effectImprove insulation effectAir-treating devicesVehicle heating/cooling devicesSolenoid valveProcess engineering
The invention relates to a system for realizing cooling medium exchange in a range-extended vehicle, comprising a first solenoid valve, a second solenoid valve and a third solenoid valve, wherein the first solenoid valve, the second solenoid valve and the third solenoid valve are all There are four ports, one of which is communicated with the other three ports, and the other three ports are not communicated with each other, which are used to fuse the pipe networks and media of different cooling systems; the system also includes a reversing valve, which is connected with the The water pumps are connected to each other for the forward and reverse exchange of the medium flow direction to form a medium exchange channel, and the inter-domain medium exchange is carried out through the water pump and the reversing valve. The present invention also relates to a control method for the cooling medium exchange of the extended-range vehicle. By adopting the system for realizing cooling medium exchange in the extended-range vehicle and the control method thereof of the present invention, the heating and heat preservation ability of the engine waste heat to the battery in severe cold regions is improved; the efficiency and thermal energy utilization rate of the heat coordination system of the whole vehicle are improved; Heat exchange efficiency and real-time performance of the circulation subsystem.
Owner:SHANGHAI ZHONGKE SHENJIANG ELECTRIC VEHICLE
Method for predictively controlling stability of large signal by inverter model based on Lyapunov criterion
PendingCN114243788ASmall distortionImprove current qualityElectronic commutation motor controlVector control systemsGrid connected inverterVoltage vector
The invention discloses an inverter model prediction control large signal stability method based on a Lyapunov criterion. Comprising the following steps: performing Clark coordinate conversion on three-phase grid-connected voltage and three-phase grid-connected current of a grid-connected inverter to obtain a voltage component and a current component at an initial moment k under an alpha-beta coordinate; acquiring corresponding actual voltage vectors of the grid-connected inverter in different switching states within the sampling period at a set time interval; calculating a virtual voltage vector by using the actual voltage vector; forming a standby voltage vector set by using the virtual voltage vector and the actual voltage vector; calculating a predicted current value at the (k + 1) moment through the voltage component and the current component at the initial moment k and the voltage vector in the standby voltage vector set; inputting the predicted current value into a Lyaponov control function, and judging whether the predicted current value meets a stability requirement or not; and controlling the grid-connected inverter to be in the optimal on-off state. The system stability can be ensured, the current quality can be improved, and the grid-connected performance is improved.
Owner:HEBEI UNIV OF TECH
An energy storage system and offshore wind power device suitable for offshore wind power
ActiveCN111711210BImprove on-grid performanceSolve power fluctuationsDc-dc conversionSingle network parallel feeding arrangementsThermodynamicsMarine engineering
The embodiment of the present invention relates to an energy storage system suitable for offshore wind power and an offshore wind power device. The energy storage system suitable for offshore wind power is connected to a three-phase AC output line after converging and boosting of offshore wind power. The energy storage system includes a parallel link and a series link, the parallel link includes the AC and energy storage module and the first static switch, the AC and energy storage module includes several AC and energy storage sub-modules; the series link includes the second static switch, the current limiting reactance The energy storage system suitable for offshore wind power can improve the grid-connected performance of offshore wind power through the setting of parallel links, provide active and reactive power support, and effectively solve the problem of offshore wind power fluctuations; through the setting of series links, it can Dynamically improve the parameters of offshore wind power transmission lines to solve the problems of low-frequency resonance and short-circuit current limiting of offshore wind power, thereby also solving the technical problems of power fluctuations, low-frequency resonance and short-circuit current limiting of existing offshore wind power.
Owner:ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
A reactive power control method for wind turbines capable of forced excitation
ActiveCN105207234BImprove reactive power compensation effectIncrease investmentReactive power adjustment/elimination/compensationWind energy generationElectricityLow voltage
The invention discloses a wind turbine generator set reactive power control method with a force excitation effect, and aims to control a wind turbine generator set which adopts a converter with a force excitation function. The method comprises the following steps: (1) enabling the force excitation function for a main control system of the wind turbine generator set; (2) judging the actual voltage value U of the wind turbine generator set, enabling the force excitation function for the wind turbine generator set, that is, enabling the wind turbine generator set to enter a force excitation mode when U is lower than a low-voltage force excitation operation threshold Ulow or higher than a high-voltage force excitation operation threshold Uhigh, performing lead compensation for force excitation if U is lower than Ulow, performing lag compensation for force excitation if U is higher than Uhigh, and performing compensation according to normal reactive power support when U is between Ulow and a 90% rated voltage of a wind turbine generator set system or between Uhigh and a 110% rated voltage of a wind turbine generator set system. Through adoption of the method, the voltage adaptability of the wind turbine generator set can be enhanced, so that the wind turbine generator set can operate within a wider voltage range, and a stronger support effect on a power grid can be achieved when a system voltage fault occurs; therefore, the method is particularly applicable to a double-fed wind turbine generator set.
Owner:GUODIAN UNITED POWER TECH +3
Active output fluctuation stabilizing method based on operating working condition of wind driven generator
ActiveCN111336063ASmooth out active output fluctuationsDoes not cause speed instability problemsWind motor controlMachines/enginesThermodynamicsPower grid
The invention relates to the technical field of wind driven generators, in particular to an active output fluctuation stabilizing method based on an operating working condition of a wind driven generator. The invention provides the active output fluctuation stabilizing method based on the operating working condition of the wind driven generator. The method stabilizes power at high frequency deviation and at low frequency deviation, that is, the method comprises the steps of storing energy effectively by means of a rotating part of a fan to inhibit active output fluctuation at high frequency deviation and releasing energy to a power grid effectively by means of the rotating part of the fan to inhibit the active output fluctuation at low frequency deviation, so that a double-fed wind drivengenerator unit takes part in power stabilization actively to smooth the frequency fluctuation of the system, thereby reducing the starting number of times of primary frequency modulation of a synchronous generator.
Owner:NANTONG UNIVERSITY
Wind collecting vertical type wind power generating system
InactiveCN101943127BImprove wind utilizationReduce volumeWind motor controlWind motor assemblyUnit systemChange control
Owner:HARBIN POWER VERTICAL WIND POWER EQUIP ENG TECH RES CENT +2
A system and method for automatic grid-connected switch control of new energy power generation combined with hardware and software
ActiveCN110233504BRealization of grid-connected switch controlReduce in quantitySingle network parallel feeding arrangementsWind energy generationComputer hardwareComputer architecture
Owner:江苏启众讯亚通信科技有限公司
Virtual synchronous machine control method and system for double-wind-wheel wind turbine generator
ActiveCN113098070AImprove operational efficiencyImprove dynamic stabilitySingle network parallel feeding arrangementsHarmonic reduction arrangementElectric power systemMachine
The invention discloses a virtual synchronous machine control method and system for a double-wind-wheel wind turbine generator set, and belongs to the technical field of wind turbine generator set control. Flexible adjustment of active power / reactive power of the unit is realized through coordinated control of two machine sides of the double-wind-wheel unit, so that the grid connection performance of the wind turbine unit can be improved on the basis of improving the operation efficiency of the wind turbine unit, and indifference control of the active power and the reactive power is realized; and when the amplitude and the frequency of a power grid are abnormal, inertia and one-time adjusting functions can be provided; the wind turbine unit realizes frequency response and voltage response through active / reactive power adjustment, and has the functions of inertia response, damping control and the like, so that the dynamic stability of a power system is further improved; and meanwhile, the coordinated output characteristic of the two wind wheel sets is fully utilized, the control logic is simple, and implementation is easy.
Owner:HUANENG CLEAN ENERGY RES INST +1
Automatic dynamic voltage control system for wind power plant
ActiveCN102882229BImprove balanceImprove on-grid performanceSingle network parallel feeding arrangementsReactive power adjustment/elimination/compensationControl signalLow voltage
Owner:BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
Damping coefficient quantitative identification method, system and device for virtual synchronous generator
ActiveCN110098632AImprove on-grid performanceSingle network parallel feeding arrangementsVirtual synchronous generatorDamping factor
The invention relates to a damping coefficient quantitative identification method and system for a virtual synchronous generator. The method comprises the steps of acquiring the voltages and the currents of the virtual synchronous generator before and after a frequency change; and calculating the damping coefficient of the virtual synchronous generator according to the voltages and the currents ofthe virtual synchronous generator before and after the frequency change and based on a pre-established damping coefficient quantitative identification expression. The method enables the correct quantitative identification of the set damping coefficient D.
Owner:CHINA ELECTRIC POWER RES INST +2
Multi-winding variable-pole variable-speed vane-type vertical wind power generating system
InactiveCN102410145BReduce wind speedNo rotational thrustYielding couplingMachines/enginesControl systemCoupling
A multi-winding variable-pole variable-speed vane-type vertical wind power generating system relates to a vertical wind power generating system. In order to solve the problems that the conventional wind power generator has poor running performance, low wind utilizing ratio, and inconvenient assembly, maintenance and transportation, three schemes are provided; a first scheme is as follows: a vertical generator is a multi-winding variable-pole vertical asynchronous generator; a fan support has a frustum-shaped structure; the vertical generator is arranged on the fan support, connected with a vertical speed increaser and controlled by an exciting intelligent grid-connected control system; the lower end of a vertical crankshaft is connected with the vertical speed increaser through a shaft coupler; an electromagnetic brake is installed on the lower end surface of an upper frame and sleeved on the vertical crankshaft; a single vane of a vane system has a vertical shutter structure; a second scheme is as follows: the single vane of the vane system has a transverse shutter structure; and a third scheme is as follows: the single vane of the vane system has a streamline structure. The multi-winding variable-pole variable-speed vane-type vertical wind power generating system is applied to wind power generation.
Owner:李树广 +1
Short-term cluster wind power prediction method based on VMD-EMD-WT signal decomposition and SDAE deep learning model
InactiveCN112926398AHigh precisionConducive to economic dispatchGeneration forecast in ac networkEnsemble learningAlgorithmEngineering
The invention provides a short-term cluster wind power prediction optimization method based on VMD-EMD-WT signal decomposition and SDAE deep learning, and the method comprises the following steps: carrying out the preprocessing of multi-dimensional NWP data and wind power plant historical power data in an original feature database, and dividing the data into a training set and a test set, using VMD, EMD and WT to decompose the wind speed and wind direction characteristic quantity of the training set to serve as a new training set, inputting the wind speed and wind direction characteristic quantity of the new training set and the test set into SDAE for deep learning, and establishing VMD-SDAE, EMD-SDAE and WT-SDAE prediction sub-models; randomly dividing output results of the three prediction sub-models into several sets, and integrating each set by using an SVM algorithm to generate a single integration result; and randomly dividing all single integration results into several sets, integrating each set by using an SVM algorithm, establishing a multi-integration learning model, and outputting a prediction result. The method has higher accuracy and better robustness, and the short-term wind power prediction precision is effectively improved.
Owner:CHINA SOUTHERN POWER GRID COMPANY +2
An Optimal Scheduling Method in Wind Farms for Reducing Mechanical Loss of Wind Turbines
ActiveCN103915855BReduce adverse effectsImprove on-grid performanceSingle network parallel feeding arrangementsForecastingPeaking power plantElectricity
The invention belongs to the technical field of wind power plants and discloses a wind power plant optimizing dispatching method for reducing mechanical loss of wind generating sets. The method includes the steps that firstly, numerical simulation is carried out under different wind conditions and different loading conditions to acquire the frequency of cyclic loading applied on different major parts under the different loading conditions; secondly, the cycle frequency generated when materials of the major parts are damaged under the different loading conditions is worked out, and then unit relative damage values of the major parts under the different loading conditions are acquired based on the linear cumulative damage theory; thirdly, optimizing calculation is carried out on combination and dispatching of wind generating sets in a wind power plant through the particle swarm optimization algorithm to obtain a combination of the wind generating sets in the wind power plant where mechanical damage of the major parts of the wind generating sets is smallest. According to the method, through reasonable combination and dispatching of the wind generating sets, output power is guaranteed, adverse effects of start, stop, switching and the like of the wind generating sets on the service life of the wind generating sets are reduced, and the operating cost of an electric system is reduced.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Guyed tower type wind-driven water pumping and energy storing generation system
InactiveCN102392780AIncrease profitImprove peak shaving performanceMachines/enginesEmission reduction for energy storageWind drivenPower station
The invention discloses a guyed tower type wind-driven water pumping and energy storing generation system, which comprises an upper reservoir, a lower reservoir, a guyed tower provided with a wind-driven generator, and a machine room placed between the upper reservoir and the lower reservoir, wherein a hydraulic generator and an electric water pump are arranged in the machine room; a water inlet of the hydraulic generator is connected to the upper reservoir through a water pipeline at the bottom of a dam, and a water outlet of that is connected to the lower reservoir; a water inlet of the electric water pump is connected into the lower reservoir, and a draining pipe of that is connected into the upper reservoir; the hydraulic generator can generate through the water in the upper reservoir; the water in the lower reservoir is pumped into the upper reservoir by the electric water pump through the power produced by the hydraulic generator. The power station with the generation system disclosed by the invention has good performance on peak regulating and synchronization; the generation system can directly replace thermal power and other fossil energy to generate power without power grid adjusting, so the generation system is a novel wind-driven generation system achieving the purpose of replacing fossil energy to generate power.
Owner:张森
Method and device for regulating and controlling converters of wind turbines in wind farms
ActiveCN113497455BReduce harmonic contentSmall sizeAc-dc conversionSingle network parallel feeding arrangementsConvertersControl engineering
A method and device for regulating the converter of a wind turbine in a wind farm are proposed. The method includes acquiring real-time voltage and current signals of a grid-connected point; acquiring real-time status information of each wind turbine on the same collector line of a wind farm; and generating unified control instructions based on the acquired real-time voltage and current signals and real-time status information. Wherein, the real-time status information includes the total number of three-phase bridge arms of the wind turbine converters running on the same collector line of the wind farm, and the dynamically allocated information for the running wind turbine converters and their three-phase bridge arms. number and the real-time power of each running wind turbine. Wherein, the unified control instruction includes a control instruction for each running wind turbine converter, wherein the control instruction includes a phase shift angle of the carrier wave required for control of each three-phase bridge arm in the converter Reference value, carrier ratio reference value, and modulated wave characteristic quantity reference value.
Owner:XINJIANG GOLDWIND SCI & TECH CO LTD
A floating photovoltaic system that can reduce the impact of grid connection on the grid
ActiveCN110783961BImprove on-grid performanceTake advantage ofPhotovoltaic supportsLighting and heating apparatusPower gridEngineering
The present invention relates to the field of floating photovoltaic technology, in particular to a floating photovoltaic system capable of reducing the impact of grid connection on the power grid, including an air compressor, a heat exchange box, a gas storage device, a photovoltaic panel, an expander, a generator, a water supply system and an external Heating system; the air storage device has a chamber, the air compressor is connected to the air inlet of the heat exchange box, the air outlet of the heat exchange box, the air storage device, and the expander are connected in sequence, the expander is connected to the generator, and the air is compressed A first valve is set on the connecting pipeline between the machine and the heat exchange box, and a second valve is set on the connecting pipeline between the gas storage device and the expander; the photovoltaic panel is set above the gas storage device; the water supply system and the heat exchange box The water inlet is connected, and the external heating system is connected to the water outlet of the heat exchange box. The device uses the lower space of the photovoltaic panel to install the gas storage device, and uses it as a supporting component of the photovoltaic on the water, so as to achieve the full utilization of the photovoltaic system on the water, establish the integrated technology of power generation and energy storage, and improve the ability of photovoltaic grid connection.
Owner:SHANDONG UNIV
Controllable short-term frequency supporting method for wind driven generator suitable for low-frequency disturbance
PendingCN111244974AImprove on-grid performancePromote commercial developmentPower oscillations reduction/preventionWind energy generationPhysicsElectric generator
The invention relates to the technical field of wind driven generator frequency control, in particular to a controllable short-term frequency supporting method for a wind driven generator suitable forlow-frequency disturbance. According to the method, droop control is added to fan rotor side control, and the active loss of a system is compensated by temporarily releasing the rotational kinetic energy stored in a fan; a self-defined droop parameter is calculated by considering the participation frequency modulation potential of the fan; rapid system frequency response is actively provided; thesystem frequency support control of a controllable wind turbine generator is realized under different fan operation conditions; that is to say, when the rotating speed of a fan rotor is high, rotating kinetic energy is fully released to compensate for active power loss and provide response time for a conventional generator set to participate in regulation, and when the rotating speed of the rotoris low, a proper amount of rotating kinetic energy is released to compensate for system active power loss, and the fan rotating speed instability problem and severe secondary frequency drop are not caused. A guarantee is provided for high-wind-power grid connection, and the use of an energy storage device for frequency modulation is reduced; and commercial development of the fan can be promoted.
Owner:NANTONG UNIVERSITY
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