144 results about "Power quality control" patented technology

The invention discloses a DC bus voltage fluctuation suppression method of a renewable energy hydrogen production system, and relates to the technical field of renewable energy electrolysis hydrogen production. The method comprises the following steps: collecting system operation parameters in real time; bus voltage disturbance power is estimated based on a disturbance observer, and frequency decomposition is carried out; fusing the ARIMA model and the LSTM model to predict the load power, and calculating a prediction deviation; dynamically setting upper and lower limits of a bus voltage control interval according to the predicted deviation and the operation state; a multi-objective optimization function is constructed, bus voltage disturbance power, prediction deviation and a control limit value are comprehensively considered, and power regulation instructions of battery energy storage, a fuel cell and an electrolytic cell are solved; and executing power regulation control to realize bus voltage stabilization. The method can improve the grading response capability of voltage disturbance, the prediction accuracy of load power change, the adaptability of the control boundary and the overall operation stability of the system, and is suitable for the electric energy quality control of the hydrogen production system in a multi-source fluctuation scene.

The invention discloses a self-adaptive harmonic current suppression method for harmonic waves of a photovoltaic inverter, which belongs to the technical field of power quality control of a power system and comprises the following steps of: compensating a control strategy through a self-adaptive harmonic component of the photovoltaic inverter by adopting a'detection-reverse injection 'framework; the difference between the residual apparent capacity of the inverter after fundamental wave power supply and the borne harmonic power is used as an adaptive quantity, and the total harmonic distortion rate of the grid-connected point is reduced to the maximum extent on the premise of no overload; the method comprises the following steps: firstly, constructing a real-time harmonic detector based on a cascade generalized integrator; secondly, an inverter impedance model is established from the aspect of impedance stability, and a control parameter stability boundary is determined; then, a self-adaptive harmonic control strategy is introduced into the single-inverter grid-connected system, and a reasonable parameter setting method is provided on the basis of considering stability limitation; afterwards, a capacity-matched harmonic power distribution algorithm is provided for a multi-inverter parallel system, and the efficiency and operation stability of a photovoltaic grid-connected power generation system are improved.

The invention relates to the technical field of electric energy quality control, and discloses an electric energy quality control method based on model prediction, a data acquisition module acquires power grid operation parameters including voltage, current, frequency and phase information in real time, indexes such as harmonic content, voltage deviation and three-phase unbalance degree are rapidly calculated according to the input parameters, and the operation is completed within a specified time. The prediction module is connected with the central processing unit, receives indexes and combines historical data through a time sequence algorithm. And the control strategy generation module generates a strategy containing reactive compensation switching and filter parameter adjustment instructions by using an optimization algorithm according to the prediction result. And the execution module drives the adjusting equipment, quickly responds, timely improves the electric energy quality when the threshold value is exceeded, and feeds back a result to the central processing unit to optimize subsequent control. The system has the advantages of prospective accurate control, high adaptability and intelligence, efficient resource utilization and cost control, and real-time performance and reliability guarantee.

The invention discloses an AC / DC power distribution network power quality control method and device, and the method comprises the steps: collecting power quality data in an AC / DC power distribution network, carrying out the feature analysis of the power quality data, and obtaining a current feature parameter and a voltage abnormality identifier; carrying out differential compression processing on the power quality data based on the current characteristic parameters and the voltage abnormity identification; transmitting the compressed data and feature information through a redundant channel comprising a main communication link and a standby communication link; and generating electric energy quality alarm information according to the transmitted data, and performing power grid operation decision control according to the information. According to the method, the electric energy quality data of the plurality of Internet of Things electric energy quality sensors in the AC / DC power distribution network are collected, and harmonic analysis is performed on the current waveform of the electric energy quality data, so that the accuracy and robustness of feature extraction are ensured; therefore, the requirements of the modern AC / DC hybrid power distribution network for high-precision, high-reliability and quick-response power quality control can be met.

The invention belongs to the technical field of electric energy quality control, and provides an energy storage type medium-voltage voltage sag and interruption treatment device and a control method thereof.The energy storage type medium-voltage voltage sag and interruption treatment device is arranged between a large power grid and a load in series and comprises a series converter PCS1, a parallel converter PCS2, an energy storage module, an injection type series transformer T1, a parallel transformer T2, a bypass static switch STS and a bypass relay KM1; wherein the injection type series transformer T1 is connected with a large power grid, and the parallel transformer T2 is connected with a load; the series converter PCS1 is connected with the injection type series transformer T1 through the bypass static switch STS and the bypass relay KM1, and compensation voltage is generated in real time through the injection type series transformer T1; the parallel converter PCS2 is respectively connected with the parallel transformer T2 and the common direct current busbar; and the energy storage module is arranged on the common direct current busbar between the series converter PCS1 and the parallel converter PCS2 in parallel.

The invention discloses an electric energy quality control method and device based on disturbance classification, equipment and a medium. The method comprises the steps of obtaining original three-phase voltage data of a transformer, and performing preprocessing operation on the original three-phase voltage data to obtain preprocessed three-phase voltage data; performing feature extraction on the preprocessed three-phase voltage data to obtain voltage disturbance features; performing anomaly detection based on the voltage disturbance characteristics, and determining a voltage disturbance classification result through an anomaly detection result and the voltage disturbance characteristics; and determining a target device control strategy based on the voltage disturbance classification result so as to control the electric energy quality through the target device control strategy. According to the technical scheme, the target device control strategy can be determined according to analysis of the voltage disturbance characteristics, accurate control over the electric energy quality problem is achieved, and the electric energy quality treatment precision is improved.

The invention relates to the technical field of electric energy quality control, and discloses an electric energy quality control system based on big data analysis, which captures electric energy quality data such as voltage, current, frequency, harmonic waves and the like at any time without fear of complex electromagnetic interference. Various communication modes such as wired, 4G, 5G or industrial Internet of Things special frequency bands are utilized, a high-speed reliable protocol is followed, and collected data are accurately delivered to a big data processing center in real time. The big data processing center simulates a smart brain, stores mass data, deeply digs the electric energy quality problem by means of an analysis processor of advanced algorithms such as a decision tree and the like, and can dynamically and adaptively adjust algorithm parameters according to real-time operation of a power grid. And finally, the control decision is tightly linked with the execution module. The system has the advantages of accurate monitoring and comprehensive control, intelligent analysis and adaptive decision making, efficient regulation and control, energy conservation and efficiency improvement, visual interaction, convenient operation and maintenance, reliable operation and safety guarantee.

The invention relates to the technical field of power quality control, and discloses an inverter harmonic suppression cooperative control method, device and equipment and a storage medium, and the method comprises the steps: employing sliding window recursive discrete Fourier transform to decompose output voltage harmonic waves in real time; generating a reverse compensation voltage for the detected harmonic component; dynamically adjusting the sampling frequency according to the load current change rate; and superposing a high-frequency jitter signal in the modulated wave. Therefore, the problem of balance among harmonic suppression efficiency, dynamic response speed and system loss of a traditional inverter is solved. The dynamic switching frequency is adaptive, and various switching frequencies can be switched to replace traditional fixed frequency modulation based on the load current change rate; harmonic compensation is adopted, PR, namely SMC double closed-loop control is matched, low-harmonic high-quality waveform output is achieved, and meanwhile the anti-interference performance of the system is improved.

The invention relates to the technical field of generator control, and discloses an intelligent vehicle-mounted high-power self-generating control method and system. The method comprises the following steps: acquiring operating parameters of a generator set, performing high-precision digital processing, realizing constant-rotating-speed control through cooperation of multiple controllers based on a rotating-speed fluctuation characteristic value, performing power factor correction through coordinate transformation and active rectification to obtain a direct-current bus voltage, performing precise voltage stabilization by adopting a multi-phase interleaving converter, and outputting the direct-current bus voltage. And finally, outputting a high-quality three-phase alternating-current power supply through space vector modulation and closed-loop feedback control. The technical problems in the prior art that the power supply quality control capability is insufficient, the intelligent level is low, the environmental adaptability is poor, the load adaptability is limited, and the maneuverability is limited are solved.

The invention discloses a harmonic suppression method and system based on feedforward control and virtual impedance, and belongs to the field of electric energy quality control, and the method comprises the steps: constructing a harmonic extraction model based on the cascading of double third-order generalized integrators, and obtaining a voltage harmonic component based on the harmonic extraction model and real-time power grid data; based on a preset power outer loop control strategy, a preset voltage and current double closed loop control strategy, a preset harmonic voltage feed-forward control strategy and the voltage harmonic component, constructing a network construction type charging pile control model, and obtaining an initial output current; obtaining each virtual impedance based on the initial output current, the harmonic extraction model and the voltage harmonic component; and obtaining a harmonic suppression model based on each virtual impedance and the network construction type charging pile control model, so as to obtain a harmonic suppression output current based on the harmonic suppression model and the real-time power grid data. According to the harmonic suppression method and system based on feedforward control and virtual impedance provided by the invention, grid-connected output current harmonics controlled by a network-forming type charging pile are effectively suppressed.

The present invention discloses a normalized evaluation method and system for a grid-connected inverter, belonging to the technical field of power quality control of power grids. The evaluation method not only evaluates the stability of the grid-connected inverter, but also evaluates the rapid control performance of the grid-connected inverter. The specific steps are: normalizing the filter parameters, calculating and simplifying the transfer function of the controlled object of the grid-connected inverter, calculating the control closed-loop transfer function of the grid-connected inverter, solving the normalized control parameters, controlling the grid-connected inverter, and calculating the normalized instability evaluation index S of the grid-connected inverter. inv and the normalized evaluation index N of the grid-connected inverter control rapidity inv The normalized evaluation index of the control rapidity of the grid-connected inverter obtained by the present invention provides a direction for the subsequent parameter design and performance optimization of the grid-connected inverter.

The invention provides a resonance damping and current compensation system and method for a grid-forming type photovoltaic grid-connected converter, and relates to the technical field of power systems, photovoltaic power generation and electric energy quality control. The system comprises a network construction type three-port grid-connected converter and a control strategy module, the network construction type three-port grid-connected converter is provided with two direct current ports and an alternating current port, and the two direct current ports and the alternating current port are connected into an energy storage capacitor bank, a photovoltaic power grid and a power grid respectively. In the control strategy module, the parallel side converter control submodule adopts direct voltage synchronous control, reactive droop control and parallel side voltage damping control, and the series side converter control submodule adopts harmonic current control, series side voltage damping control and photovoltaic control. According to the invention, the series-parallel three-port converter structure is combined with a network construction type control strategy, so that the damping of the photovoltaic grid-connected converter to the voltage resonance of the grid-connected point and the harmonic compensation of the power grid current are realized, and the operation stability and the electric energy quality under the weak power grid are improved.

The invention relates to the technical field of electric energy quality control, and discloses an electric energy quality control method under distributed energy access, which comprises the following steps: S1, data acquisition and transmission; high-performance sensors are deployed at key nodes, sensitivity is high, stability is high, and it is ensured that data are sent to a management and control center in real time in a low-delay and low-packet-loss mode. And S2, analysis and diagnosis. The control center multi-core processor operates software fusing fast Fourier transform, wavelet transform and a deep learning algorithm, the electric energy quality is judged according to a high-standard threshold value, and an abnormal source is intelligently traced. And S3, cooperative control. When the electric energy quality does not reach the standard, the control center directs the SVG to output reactive current in a millisecond level according to a strategy library, the APF filters harmonic waves, the high-quality electric energy quality is cooperatively recovered, and energy and a power grid are balanced. The method has the advantages that data acquisition is accurate and efficient, a communication link is stable and reliable, analysis and diagnosis are intelligent and agile, and cooperative control is fine and flexible.

The invention discloses a dynamic voltage recovery and flicker suppression method based on light-storage cooperation, and relates to the technical field of power quality control of a power distribution network, and the method comprises the steps: obtaining a dynamic topological structure and a node impedance spectrum of the power distribution network in real time; calculating the vulnerability index of each node based on the data; generating a risk thermodynamic diagram according to the vulnerability index; proactive power scheduling is performed on the energy storage system based on a thermodynamic diagram, node impedance characteristics can be actively shaped and optimized in combination with impedance, the system comprises an intelligent monitoring unit, a central control platform, the energy storage system and a communication network, weak links of the system can be accurately recognized, the problems that a voltage disturbance propagation path is uncertain and the early warning adaptability is poor are solved, and the system reliability is improved. The perspectiveness and the accuracy of voltage disturbance suppression are improved, and the voltage stability and the power supply reliability of the power distribution network are enhanced.

The invention discloses an electric energy quality optimization method and system based on carrier modulation, and relates to the field of electric energy quality optimization, and the method comprises the steps: obtaining bridge arm information of a distributed energy storage type electric energy quality controller, and determining a carrier amplitude adjustment strategy; determining a target zero-sequence component needing to be injected through carrier characteristics based on the carrier amplitude adjustment strategy; according to the target zero-sequence component, performing superposition on the original modulation wave to generate a target modulation wave; adjusting the power of the power grid based on the target modulating wave, and carrying out dynamic compensation on the capacitance voltage deviation; the harmonic suppression capability is improved, and the power distribution dynamic response efficiency is enhanced, so that the optimization of the electric energy quality is realized, and the problem that the real-time performance and the reliability of the electric energy quality regulation are reduced due to the limitation of harmonic compensation and the lack of real-time dynamic response in the conventional pulse width modulation method is solved.

The invention discloses a power quality control method for a power distribution network. The method comprises the following steps: monitoring power quality parameters of a target node of the power distribution network in real time; analyzing and identifying the current power quality state based on the monitoring parameters; generating a compensation control instruction according to the state in combination with a preset control target or a dynamically adjusted control strategy; outputting the instruction to at least one electric energy quality adjusting device on the power distribution network; and triggering the device to execute the instruction, and performing dynamic compensation adjustment on the power quality parameters of the power distribution network. The method can realize effective management and control of the power quality of the power distribution network, and improves the power supply stability.

The invention provides a passive device parameter design method suitable for suppressing multi-mode broadband oscillation of a double-high power distribution network, and relates to the technical field of power distribution network electric energy quality treatment. According to the method, port impedance modeling is performed on the power distribution network, a node admittance matrix is established, and a key node for oscillation suppression is determined in combination with modal analysis; port admittance parameters of the passive device are equivalently injected into the node admittance matrix in parallel at the key node, iterative optimization is performed on the port admittance parameters by using a particle swarm algorithm, and a passive device parameter fitting result is obtained by taking a damping coefficient greater than or equal to zero point 2 and a resonance angular frequency satisfying an integral multiple of a 2-hundred product circumference rate as an optimization target; the resonance peak weakening effect is verified by constructing a frequency response model before and after the passive device is accessed. According to the method, systematized and collaborative suppression of multi-mode broadband oscillation is realized, and the stability of the double-high power distribution network is remarkably improved.

The invention provides an electric energy quality control method and system based on an energy storage system, relates to the technical field of electric energy quality control, and aims to identify collaborative disturbance attributes during voltage sag and three-phase imbalance through dynamic distortion information, perform scheduling amplitude limiting compensation on the collaborative disturbance attributes, and improve the control accuracy of the electric energy quality. Obtaining a layered amplitude limiting inflection point when the electric energy in the energy storage system is intelligently scheduled in the load-storage balance constraint region; carrying out fusion correction on the circulation out-of-limit deviation, generating a dynamic peak regulation criterion when the power grid carries out energy storage transfer adjustment in multiple time scales, and further determining a regulation and control guidance strategy during electric energy balance regulation and control in the energy storage system according to the dynamic peak regulation criterion; and performing tolerance adaptation control on the power quality of the power distribution network in the composite disturbance scene according to the hierarchical amplitude limiting inflection point and the regulation and control guidance strategy. According to the invention, tolerance adaptation control can be carried out on the power quality of the power distribution network in a composite disturbance scene, so that the power quality management and control efficiency under the participation of an energy storage system is improved.

The invention discloses an intelligent photovoltaic power quality control system which comprises a photovoltaic data acquisition module, a feature space trend chart construction module, an isolation correction module, a preliminary clustering module, a boundary disturbance distribution module, a clustering optimization module and a photovoltaic power quality control module. The invention belongs to the field of electric energy quality control, and particularly relates to an intelligent photovoltaic electric energy quality control system. According to the scheme, hierarchical inflection points from tiny fluctuation to violent interference are captured in a self-adaptive mode, and events of different intensities are recognized more flexibly; trend deviation caused by abnormal disturbance is eliminated; a density consistency constraint is introduced to calculate a merging index; the photovoltaic power quality control accuracy is improved; the blind area probability is reduced through initialization, and the characteristics of photovoltaic data are better adapted; a dynamic balance mechanism is introduced to balance global search and local convergence; long-term retention of inferior solutions is avoided based on a local search enhancement mechanism; and finally, the photovoltaic power quality control effect is improved.

The invention discloses a distribution network on-line ice melting reactive compensation method and system based on magnetic control switch grading compensation, and relates to the field of disaster prevention and reduction and electric energy quality control of an electric power system. The problems of reactive unbalance, voltage fluctuation and harmonic pollution in the ice melting process are solved. The core is that a Z-type grounding transformer zero-sequence ice melting topology and a magnetically controlled switch grading compensation topology are integrated, and line ice melting is realized by constructing a zero-sequence ice melting loop; a double-state control strategy of blocking-state high-damping standby and conducting-state inrush-current-free switching of a magnetically-controlled switch branch is designed, and integration of reactive compensation and harmonic filtering is achieved by combining resonance tuning; the number of compensation branch switching groups is dynamically adjusted by adopting split-phase independent nine-zone graph closed-loop hierarchical control. According to the invention, ice melting and reactive compensation co-topology operation is realized, the stability of a power grid is improved, the device loss and the operation and maintenance cost are reduced, the mobile ice melting requirement is met, and the engineering practicability is high.

The invention discloses an electric energy quality adjusting device and method, and relates to the technical field of power electronics and electric energy quality control, and the method comprises the following steps: connecting a three-level topological inverter of a series structure with a transformer, adjusting the amplitude and phase of an output voltage in real time, and achieving the voltage compensation and power flow adjustment between AC ports in a power supply system; and starting the three-level topological inverter with the parallel structure, detecting the load side current, and separating and extracting the reactive current component, the harmonic current component and the three-phase unbalanced current. According to the invention, through cooperative control of a series-parallel topological structure, integrated adjustment of multi-dimensional electric energy quality parameters such as voltage, reactive power, harmonic waves and imbalance is realized; an ARM + FPGA dual-core control architecture and an electronic bypass mechanism are adopted, so that the response speed and the operation stability of the system are remarkably improved; in combination with P + repetitive control and PI control strategies, the harmonic compensation precision and the bus voltage control capability are improved, and the method has good adaptivity and real-time performance.

The invention provides a medium-voltage chain type energy storage system topology and a control method thereof, and relates to the technical field of power system electric energy quality control and new energy grid connection. The method has a sag supporting function and can be used for a medium-voltage power distribution network. The medium-voltage chain type energy storage system topologically integrates a three-phase parallel side chain type STATCOM (static synchronous compensator), a three-phase series side chain type STATCOM and an energy storage device, and comprises a transformer secondary winding in triangular connection. The three-phase parallel side chained STATCOM adopts positive and negative sequence voltage and current double-loop control, the three-phase series side chained STATCOM adopts an interphase direct-current voltage equalizing strategy of zero-sequence component injection through an angle connection winding, and the chained STATCOMs on the two sides both adopt a network construction type control method. The parallel side chain type STATCOM, the series side chain type STATCOM, the energy storage device and the triangular connection secondary winding are integrated, and a network construction type control strategy is combined, so that the operation stability and the electric energy quality of the system in a medium-voltage scene are improved, and a grid-connected point sag support function and direct-current voltage balance control of the chain type device are realized.

The invention discloses an energy storage cophase power supply system based on a V-connection traction transformer, a control method and a storage medium, and belongs to the technical field of electrified railway power supply. The energy storage in-phase power supply system comprises a V-connection traction transformer, three single-phase compensation devices, an energy storage device and a coordination control device. The primary side of the V-connection traction transformer is connected with a three-phase power supply, and any port of the secondary side is connected with a traction load; aC ends of the three single-phase compensation devices are respectively connected to different ports of the secondary side, and DC ends are connected in parallel to a DC bus; the energy storage device is also connected in parallel with the DC bus. The coordination control device collects current and voltage signals and controls operation of the devices. The system has the functions of energy storage and in-phase power supply, and solves the problems of large traction load fluctuation of a traditional electrified railway traction substation, power return caused by train regenerative braking, train over-electricity split-phase stall and electric energy quality management.

The invention relates to the technical field of power quality monitoring and management, and discloses a power distribution network power quality control method and computer equipment. The method comprises the following steps: acquiring real-time operation data of a power distribution network and an original electric energy quality signal of a disturbance node, decomposing the signal and determining an optimal decomposition modal number by taking minimization of a total variance as a target; determining a key time sequence feature set based on the optimal decomposition mode number and a preset disturbance type label; reasoning by taking a disturbance node as a starting point in the topological structure of the power distribution network to obtain a disturbance propagation path, and determining a voltage change rate of each node; screening candidate measures based on the voltage change rate, the feature set and a threshold value, and constructing a judgment matrix in combination with a preset evaluation index; determining a priority weight based on the judgment matrix so as to determine an optimal governance device; and determining dynamic output parameters according to the index measured values, the reference values and the real-time data, and controlling the optimal treatment equipment to operate according to the dynamic output parameters. The accuracy of controlling the power quality disturbance of the power distribution network can be improved.

The invention relates to the technical field of electric energy quality control, and discloses a distributed collaborative electric energy quality control system, which is characterized in that a plurality of distributed electric energy quality monitoring terminals are uniformly distributed at key nodes of a power grid, accurately acquire core parameters such as voltage, current effective values, harmonic distortion rate and voltage sag, and are internally provided with unique position codes for accurate positioning; the data transmission network is connected with the monitoring terminal and the central control unit to ensure high-speed, stable and real-time transmission of data; the central control unit integrates a storage module, an analysis module and a strategy generation module and is used for storing data, analyzing electric energy quality, positioning problems and generating a regulation and control strategy; and the plurality of distributed electric energy quality adjusting devices are arranged in a power grid hub, communicate with the central control unit, optimize the electric energy quality according to the power grid hub, are internally provided with self-checking units, and feed back abnormity. The system has the advantages of omnibearing accurate monitoring, intelligent and efficient regulation and control, high reliability guarantee and improved operation and maintenance convenience.

The invention relates to the technical field of electric energy quality control, and discloses a grid-connected inverter dual-mode smooth switching control method suitable for a power grid distortion condition, and the method comprises the steps: operating a grid-connected inverter in a current source control mode, and collecting a network access current and a grid-connected point voltage; determining a system matrix and an output matrix of the grid-connected inverter; discretizing the system matrix and the output matrix, substituting the discretized matrix into a Kalman filter, and obtaining a fundamental wave voltage observation value and a fundamental wave current observation value through the Kalman filter; synthesizing the fundamental voltage observation value and the grid-connected point voltage into a harmonic voltage observation value; setting a system short-circuit ratio boundary value lambda of the grid-connected inverter, and obtaining a system short-circuit ratio SCR; and when it is judged that the current source control mode is switched, the grid-connected inverter is switched to operate in a voltage source control mode. According to the invention, the influence of the power grid fault on the grid-connected inverter can be reduced, and the reliability and stability of the whole power system are improved.

The utility model provides an electric energy quality control system, and belongs to the technical field of power electronics. The electric energy quality control system comprises a transformer module, a power conversion module and a switch module, and the power conversion module comprises an off-grid inverter; one end of the transformer module is used for accessing a three-phase power grid, and the other end of the transformer module is connected with an alternating current port of an off-grid inverter in the power conversion module and a zero line; the alternating current port of the off-grid inverter is also connected with the input end of the switch module, the output end of the switch module is connected with the zero line of the off-grid inverter, and the control end of the switch module is respectively connected with the signal control end of the off-grid inverter and an external driving circuit. According to the invention, the stability and reliability of the power quality control system can be improved.

This invention discloses a method for suppressing DC bus voltage fluctuations in a renewable energy hydrogen production system, relating to the field of renewable energy electrolysis hydrogen production technology. The method includes: real-time acquisition of system operating parameters; estimation of bus voltage disturbance power based on a disturbance observer and frequency decomposition; prediction of load power using ARIMA and LSTM models and calculation of prediction deviation; dynamic setting of upper and lower limits of the bus voltage control range based on the prediction deviation and operating status; construction of a multi-objective optimization function, comprehensively considering bus voltage disturbance power, prediction deviation, and control limits, to solve for the power regulation commands of battery storage, fuel cells, and electrolyzers; and execution of power regulation control to achieve bus voltage stability. This invention can improve the graded response capability to voltage disturbances, the accuracy of load power change prediction, the adaptability of control boundaries, and the overall operational stability of the system, and is suitable for power quality control of hydrogen production systems under multi-source fluctuation scenarios.

The invention discloses an MAS-based power quality controller cooperative control method and system, and belongs to the technical field of power quality controller cooperative control. Intelligent agents are introduced into a power distribution network, each equipment node in the power distribution network is detected and analyzed by the intelligent agents, and corresponding tasks are allocated to the corresponding intelligent agents according to analysis results; therefore, cooperative control is carried out on the series-side converter and the parallel-side converter of the electric energy quality controller, the series-side converter helps the parallel-side converter to carry out auxiliary compensation, resources of the series-side converter are fully utilized, the task pressure of reactive compensation and harmonic suppression of the parallel-side converter is relieved, and the service life of the electric energy quality controller is prolonged. And the working efficiency of the electric energy quality controller is also improved.

The application discloses an active power filter control method for preventing resonance, and relates to the technical field of power quality control.The method injects a harmonic current with a frequency of a pre-judged harmonic frequency into a power supply circuit, compares the change in the grid-side current and the load-side current before and after the injection, obtains a sensitive frequency point, separates the harmonic component corresponding to the sensitive frequency point from the harmonic components corresponding to other frequencies, and respectively generates compensation currents, wherein the harmonic component corresponding to the sensitive frequency point is adjusted through a feedback coefficient, different compensation currents are superimposed to obtain a comprehensive compensation current, the comprehensive compensation current is used to offset the load harmonic current, and the grid-side current is ensured to be undistorted.The technical scheme in the application can realize harmonic impedance adjustment, effectively prevent harmonic amplification, avoid passive element burning or power supply failure, and enhance the safety and reliability of power supply.