59 results about "Series compensation" patented technology

Systems and method to minimize conditions that cause sub-synchronous oscillation (SSOs) associated with series compensated transmission grids. The implementations ensures the correct development of methods and systems that can mitigate sub-synchronous oscillation (SSOs) associated with a series compensated transmission grid and enhance the series compensation efficiency. An example implementation is a network-based SSO mitigation technology, and another example implementation is a generator-based SSO mitigation technology. The discovery and example implementations are applicable to series compensated transmission networks with synchronous generators, induction generators, wind turbines, solar photovoltaic generators, charging stations, battery storage systems, high-voltage DC transmission systems, STATCOMs, inverter-based data centers, and other inverter-based resources.

The present application belongs to the field of flexible AC transmission and distribution and power electronics, and discloses a unified power quality conditioner and method to achieve the goal of power quality management. The device comprises a DC bus and a compensation unit and a regulating unit connected thereto; the compensation unit comprises a series compensation subunit and a parallel compensation subunit; the series compensation subunit is used for compensating the load voltage; the DC bus is used for providing compensation energy for the series compensation subunit; the parallel compensation subunit is used for compensating the load harmonic, three-phase imbalance and reactive current, and also used for providing voltage support for the DC bus and energy for the series compensation subunit; the regulating unit comprises a parallel super capacitor energy storage system and a photovoltaic power generation system; the super capacitor energy storage system comprises a super capacitor and a first DC / DC converter; the photovoltaic power generation system comprises a photovoltaic array and a second DC / DC converter. The present application solves the coupling problem of the series and parallel inverters of the device, and makes the DC side bus voltage stable.

The invention discloses a power grid operation mode voltage automatic adjustment method and system suitable for different new energy coincidence rates, and belongs to the technical field of power systems. According to the method, series compensation and parallel compensation of a plant station with an out-of-limit bus in a third power flow result are output, a capacitor is automatically input or reactance is automatically quitted from the plant station with the voltage exceeding the lower limit according to the difference between the voltage and the limit voltage, and a reactive power is automatically output from the plant station with the voltage exceeding the upper limit according to the difference between the voltage and the limit voltage. And the capacitor is automatically withdrawn or the reactance is input. According to the invention, under the condition that the voltage cannot be adjusted, surrounding reactive power resources can be automatically adjusted, the terminal voltage of a new energy machine is cooperatively adjusted, and the voltage of a high voltage level can be automatically switched to a target level through series-parallel compensation.

The application discloses a kind of second-order general type fast desaturation controller determination method and system, it is related to engineering system control field, this method includes: determining the saturation gain of actuator in target industrial control system;Using the input-output deviation of actuator, second-order general type fast integral desaturation compensator is constructed;Based on saturation gain, second-order general type fast integral desaturation compensator is equivalent into the desaturation structure of series compensation, and the compensation link and desaturation channel in desaturation structure are determined;Using the linkage relationship of bandwidth PID controller and desaturation bandwidth, the value of desaturation bandwidth in compensation link and desaturation channel is determined, to obtain the second-order general type fast desaturation controller of target industrial control system.The application can realize control while selecting less parameters, and improve the stability of control.

The utility model discloses a low pressure series compensation device relates to the technical field of compensation circuit, including the soft start power supply circuit for controlling starting current slow rise, the surge impact is suppressed, the capacitive reactive power output for the dynamic regulation series capacitor, the low pressure reactive power compensation circuit of compensation inductive load's reactive power shortage, the voltage detection circuit for real -time tracking circuit voltage fluctuation, generates the voltage feedback signal required for compensation control. The utility model discloses through the voltage detection circuit, thereby through the accurate detection of resistance voltage dividing network and operational amplifier IC1, realizes real -time monitoring and signal conditioning to the grid voltage, ensures that compensation system can accurately obtain voltage variation information, provides reliable data support for reactive power compensation control.

A static synchronous series compensation system and method, the scheme includes: a primary circuit installed on a high potential platform and a secondary circuit installed in a control protection room; the high potential platform is connected with a power transmission line at the same potential; the primary circuit is connected in series with the power transmission line to compensate the voltage of the power transmission line; the secondary circuit is connected with the primary circuit, and compensation instructions are issued to the primary circuit according to the voltage loss value of the power transmission line. The static synchronous series compensation system in the scheme does not need a series transformer or only needs a low insulation grade series transformer, greatly reduces the insulation design difficulty of the series transformer, reduces the device cost, reduces the equipment weight, reduces the equipment cost, and greatly reduces the occupied area. In the scheme, the high potential platform is connected with the power transmission line at the same potential, and the primary circuit is installed on the high potential platform, which reduces the energy loss of the primary circuit caused by corona discharge and the electromagnetic interference of the adjacent equipment.

The invention discloses a method and device for calculating the defect rate of series compensation secondary equipment under different operation years, a medium and equipment. The method comprises the following steps: extracting a series compensation secondary equipment set and a series compensation secondary equipment defect set which meet a preset statistical condition; dividing the operating age limit into a plurality of continuous operating age limit units based on the division granularity of the operating age limit; traversing the series compensation secondary equipment in the series compensation secondary equipment set, determining operation age limit units covered by the life cycle of the series compensation secondary equipment according to the commissioning time and the back operation time of the series compensation secondary equipment, and adding 1 to an equipment number counter corresponding to each covered operation age limit unit; traversing equipment defects in the series compensation secondary equipment defect set, determining an operation age limit unit to which the equipment defects belong according to the operation age limit of the corresponding series compensation secondary equipment when the defects occur, and adding 1 to a defect number counter corresponding to the operation age limit unit; and for each operating age limit unit, calculating the defect rate of the operating age limit unit according to the corresponding defect number and equipment number.

The invention discloses a subsynchronous / supersynchronous oscillation characteristic-maintained wind power plant equivalent modeling method, which comprises the following steps of: constructing a frequency domain impedance model based on a doubly-fed fan series compensation grid-connected system; based on the frequency domain impedance model, the influence of the wind speed and the grid-connected distance on the frequency domain impedance characteristic is analyzed, and a dynamic grouping result of the doubly-fed wind turbine generator is obtained through a clustering algorithm; adopting a capacity weighting method to obtain parameters of an equivalent wind turbine generator; determining reserved nodes and eliminated nodes of the system according to a dynamic grouping result of the wind turbine generator, and obtaining equivalent parameters of the current collection network by adopting an REI static equivalence method; and establishing a doubly-fed fan series compensation grid-connected system simulation model based on the simulation platform, comparing the steady-state power flow, the dynamic response and the sub / super-synchronous oscillation characteristics before and after equivalence, and analyzing the equivalence precision. The new energy station dynamic equivalence method provided by the invention has good equivalence precision in steady-state power flow and dynamic response characteristics, and provides an accurate model basis for analyzing the stability of a high-proportion new energy power system.

The present application relates to the technical field of eddy current pulse thermography detection, and specifically discloses an eddy current pulse thermography detection system based on LCC resonance topology and a control method thereof, aiming at the problems of resonance frequency drift and excitation current fluctuation caused by the change of lift-off height of the traditional eddy current pulse thermography excitation source, the present application adopts LCC resonance topology, sets compensation inductance, parallel compensation capacitor and series compensation capacitor to meet specific parameter conditions, decouples the excitation coil current from the lift-off height and keeps it constant, and at the same time ensures that the system realizes soft switching in the full load range. On this basis, a voltage closed-loop control strategy is further introduced, the real-time lift-off height is calculated, and the output voltage of the full-bridge inverter is adjusted accordingly to realize constant power output and stable temperature rise of the tested piece under the change of lift-off height. The present application effectively overcomes the influence of the change of lift-off height on the consistency of the detection result, and improves the reliability and on-site operation flexibility of the system.

The application provides a wide-range on-load voltage regulation voltage compensation control method and system, and an AC / DC / AC converter is connected to the output of an on-load voltage regulation transformer. The converter mainly comprises a parallel side and a series side, and the output of the series side converter is connected to a series transformer. Output voltage regulation is combined with on-load voltage regulation distribution transformer gear adjustment and converter series compensation. Converter capacity configuration considers voltage compensation range, three-phase imbalance compensation, reactive power compensation, thermal effect caused by harmonic compensation and maximum current stress of the converter output. The series side converter output voltage compensation adopts a positive and negative sequence separation control algorithm. The scheme can realize wide-range output voltage stepless compensation regulation, can flexibly limit the current inner loop of the series side converter, avoids equipment overload, and improves equipment reliability.

The invention relates to the technical field of new energy grid connection, and discloses a double-fed wind power plant subsynchronous oscillation suppression device and method based on GCSC-SSRDC. The bottleneck problems of insufficient robustness and poor adaptability of an existing suppression scheme in complex actual engineering can be solved to a certain extent. The device comprises a gating series capacitor GCSC used for replacing a fixed series compensation capacitor and providing a fixed capacitive reactance compensation line inductive reactance, a power dispatching controller used for obtaining a power signal of a power transmission line and outputting a fundamental frequency compensation reactance instruction after processing the power signal through a first-order low-pass filter, and a subsynchronous resonance damping controller SSRDC used for obtaining a current signal of the power transmission line and outputting a fundamental frequency compensation reactance instruction after processing the power signal through a second-order low-pass filter. The control signal generation module is used for superposing the fundamental frequency compensation reactance instruction and the additional reactance instruction and then converting the superposed fundamental frequency compensation reactance instruction and additional reactance instruction into a turn-off pulse signal of a gate control series capacitor switching device through an amplitude limiting, table lookup and pulse generation unit; and suppression of subsynchronous oscillation is realized.

The application discloses a power distribution network non-stop load transfer control method and system based on series compensation, solves the problems of loop closing transient impact, user short-time power failure and the like. The application gives a topology structure of the non-stop load transfer system, introduces the working principle of the system, utilizes the voltage amplitude and phase angle compensation function provided by the series compensation, realizes seamless loop closing control, and further realizes load smooth transfer control by using impedance compensation function. The above method can not only realize that the loop closing moment is not affected by voltage and current impact, the transfer process is stable, and the non-stop load transfer, but also expands the application range of loop closing transfer power, and improves the safety and reliability of loop closing transfer power.

This invention relates to the field of power equipment condition monitoring technology, and discloses an online monitoring and evaluation device and method for series compensation capacitors. The method includes: acquiring operating signals and extracting steady-state operating characteristics and transient characteristic parameters; combining historical cumulative fatigue damage, calculating the dynamic frequency-varying equivalent series resistance modulated by the damage positive feedback effect, and substituting it into the thermal differential equation to iteratively calculate the dynamic hot spot temperature sequence; for transient events, constructing a cross-coupling term characterizing the synergistic effect of electrodynamics and thermomechanical softening, and calculating the high-frequency equivalent partial discharge; performing thermomechanical softening correction on the transient overvoltage peak to obtain the thermomechanical equivalent transient stress, and dynamically updating the electro-thermal-mechanical coupled cumulative fatigue damage by combining real-time dynamic hot spot temperature and high-frequency equivalent partial discharge; finally outputting a health status index. This invention integrates the time-varying evolution of thermal stress and the multi-physics field transient synergistic damage mechanism, significantly improving the accuracy of equipment damage quantification.

The application discloses a method for suppressing subsynchronous resonance of a doubly-fed wind turbine based on additional electromagnetic torque, and the method comprises the following steps: constructing a transfer function between a rotor-side electromagnetic torque variation and a rotor speed disturbance by a flux linkage equation of a three-phase asynchronous motor and a rotor-side electromagnetic torque expression of the three-phase asynchronous motor; deriving a generation mechanism of the subsynchronous resonance from a physical layer according to the transfer function; and adding a subsynchronous resonance damping control strategy for additional electromagnetic torque of a target doubly-fed wind turbine in a d-axis controller of a rotor-side converter according to the generation mechanism of the subsynchronous resonance, so that the target doubly-fed wind turbine generates an electromagnetic torque which is opposite in phase to the rotor speed disturbance, thereby effectively suppressing the subsynchronous resonance of a power transmission system for transmitting wind power from the doubly-fed wind turbine to outside through a series compensation transmission line.

The application discloses a controllable series compensation sub-synchronous oscillation suppression method based on a linear active disturbance rejection control strategy, which comprises the following steps: adopting a dynamic phasor method to perform mathematical modeling on the controllable series compensation, using the principle and differential characteristics of the dynamic vector method, taking the capacitance voltage of the TCSC and the inductance current of the TCR branch as state variables to perform modeling, and obtaining a dynamic phasor model of the controllable series compensation; designing a linear active disturbance rejection TCSC controller: applying the linear active disturbance rejection control principle to the dynamic phasor model of the controllable series compensation to change the series compensation degree, taking the power on the power transmission line as an input quantity, and respectively designing a linear extended state observer and a linear state error feedback law of the linear active disturbance rejection TCSC controller to control the series compensation degree of the controllable series compensation; and in a doubly-fed wind power plant grid-connected system, the TCSC based on the linear active disturbance rejection control strategy is used to suppress oscillation. The application improves the stability of the doubly-fed wind power plant grid-connected system when small disturbance and large disturbance occur.

The invention discloses a wireless coupling energy transfer coil anti-offset system and method based on magnetic integration, the system comprises a primary side compensation circuit, a transmitting coil, a receiving coil Ls and a secondary side compensation circuit which are arranged between a system primary side and a system secondary side, and the primary side compensation circuit comprises a primary side compensation inductor LT, a primary side parallel compensation capacitor CT and a primary side series compensation capacitor Cp; the secondary side compensation circuit comprises a secondary side compensation inductor L2, a secondary side parallel compensation capacitor C2 and a secondary side series compensation capacitor Cs; the transmitting coil comprises an energy transmitting sub-coil Lp arranged on the primary side slip ring and an integrated reverse series coil Lf; and the secondary side compensation inductor L2 and the receiving coil Ls are integrally arranged on the secondary side slip ring. According to the invention, the anti-offset characteristic of the wireless slip ring system is effectively improved in a targeted manner by introducing the transmitting coil which is connected in series reversely and the receiving coil integrated with the resonant inductor into the bilateral LCC topology.

The invention relates to the technical field of wind power generation grid-connected stabilization, in particular to a method and a system for enhancing the stability of a doubly-fed wind power series compensation grid-connected system converter. Comprising the steps of collecting a rotor current signal and initializing a reference frequency; extracting a subsynchronous oscillation component through a recursive least square method; executing sliding window spectrum transformation to identify a dominant oscillation frequency, and updating a reference frequency when a stable condition is satisfied; inputting the historical spectrum characteristics into a long short-term memory network to predict oscillation frequency, and updating reference frequency according to prediction deviation; calculating a compensation voltage instruction based on the reference frequency and the oscillation component, superposing the compensation voltage instruction to a converter control loop, and establishing a local control model; a plurality of units are used as federal learning clients to train a local model, and a central server carries out weighted aggregation on model parameters and issues and updates the model parameters. According to the invention, adaptive oscillation suppression and multi-station collaborative optimization are realized, and data privacy security is guaranteed.

The invention discloses a detection type pilot protection method, system, equipment and medium suitable for a power transmission line with a series compensation device, and relates to the technical field of relay protection, and the method comprises the steps: injecting higher harmonic electrical quantity into a power system through an adjacent controllable converter when the operation state of the power system is abnormal; respectively calculating a differential current and a braking current under higher harmonic electrical quantity injection, deducing a differential braking ratio based on the differential current and the braking current, and preferably selecting a plurality of harmonic electrical quantities according to the differential braking ratio; and comparing the longitudinal differential protection sensitivity under the plurality of harmonic electrical quantity injections, constructing a longitudinal differential protection criterion based on a comparison result of the longitudinal differential protection sensitivity, and executing a power transmission line protection action according to the longitudinal differential protection criterion. According to the method, odd harmonics are injected into the line when the fault occurs, and third harmonics are preferentially selected, so that the reactance of the line is multiplied, the capacitive reactance of a series compensation capacitor is reduced, and the proportion of the capacitance impedance in the total impedance is weakened.

The application discloses a GFSK modulation method and circuit for VCO non-linear compensation, aiming at solving the modulation frequency deviation instability problem of a voltage-controlled oscillator in a two-point modulation architecture caused by control voltage fluctuation and frequency band switching. The application adds a compensation capacitor group matched with the main tuning capacitor characteristics to the FSK_MOD module, so that the capacitance value changes synchronously with the control voltage to offset the total capacitance drift of the resonant cavity; meanwhile, the output voltage of the DAC module is dynamically adjusted based on the frequency band control signal to real-time suppress the influence of the load capacitance jump across the frequency band. The corresponding circuit integrates the series compensation capacitor and the fixed capacitor in the FSK_MOD module to form a compensation branch, and configures the compensation current injection end with the operational amplifier. By using the application, the modulation frequency deviation can be stably maintained within the tolerance range required by the Bluetooth protocol in the whole working frequency band, and the anti-adjacent channel interference ability and data transmission reliability of the wireless communication system are greatly improved.

In the traditional wireless power transmission technology, a full-bridge inverter is mostly adopted to realize alternating-current inversion, so that the problems that the cost of a wireless charging product is increased, the inversion frequency is limited and the like are caused. In order to realize high degree of freedom and low cost of a wireless charging product, an E-type inverter is often adopted to realize high-frequency inversion. And the E-type inverter adopts a single switching tube for inversion, so that the requirement on devices is low. However, the E-type inverter is greatly influenced by a load and is easy to work in a hard switching state due to load change, so that the working efficiency of the system is reduced, a switch is damaged under a serious condition, the stability of the system is reduced, and finally the application of the E-type inverter in an actual product is limited. The invention discloses a high-efficiency and wide-load soft switching system design scheme and a corresponding control strategy. In a wireless charging system adopting an E-type inverter, when the system works at a rated distance, a secondary side series compensation capacitor is connected, and when the transmission distance becomes closer, the efficiency and the power of the wireless charging system based on the E-type inverter are in a state that the efficiency and the power are suddenly reduced after being transiently increased. At the moment, if the system efficiency is obviously reduced or the temperature of the switching tube is abnormally increased, the secondary side compensation capacitor parallel switch is closed, the series compensation capacitor is equivalently cut off, the system is recovered to the soft switching state, the switching temperature is recovered to be normal, and the system efficiency and the output power are obviously improved.

The invention discloses a series compensation control and protection device, a loop similar defect recommendation method and device and a medium. The method comprises the following steps: determining a target defect category to which a defect to be recommended belongs according to an equipment model and a defect part of the defect to be recommended; adopting a named entity recognition model to extract defect phenomenon and defect part entities from the description text of the to-be-recommended defect to form a structured feature entity of the to-be-recommended defect; calling a predefined category exclusive weight configuration scheme according to the target defect category; based on the structured feature entity and the category exclusive weight configuration scheme, calculating the comprehensive similarity between the to-be-recommended defect and the historical defect belonging to the same target defect category in the defect library; and performing comparison and screening on the basis of the comprehensive similarity and a threshold value preset for the target defect category, and outputting a similar defect recommendation result.

The invention provides a three-phase magnetic field coupling type wireless power transmission system, and relates to the technical field of wireless charging, the system comprises a transmitting part, the transmitting part is used for being coupled with a receiving part, and the transmitting part comprises a direct current voltage source, a three-phase high-frequency inverter and a transmitting side three-phase LCC compensation network; the direct-current voltage source is connected to the input end of the three-phase high-frequency inverter, the output end of the three-phase high-frequency inverter is connected to the input end of the compensation network, the compensation network comprises three resonance units, each resonance unit comprises a series compensation capacitor and a transmitting coil, and the series compensation capacitors and the transmitting coils are connected in series to form a series branch. The three series branches integrally form a transmitting side resonant circuit in a Y-shaped connection mode; wherein the three transmitting coils all adopt a double-layer overlapped structure, and the distances between the transmitting coils and the corresponding ferrites are equal; according to the invention, the problem of inductance imbalance caused by a multi-layer structure is solved, the loss is reduced, and the transmission efficiency and the stability of the system are improved.

The invention relates to a series compensation type multi-port flexible interconnection device, which comprises a series compensation and power flow regulation and control unit, a control system, a first alternating current port, a second alternating current port and a multi-winding interconnection transformer, and is characterized in that the multi-winding interconnection transformer comprises a primary winding and a secondary winding; the voltage grade of the first alternating current port is the same as that of the second alternating current port, and the first alternating current port and the second alternating current port are used for interconnecting two alternating current power grids or two buses; the direct current side of the series compensation and power flow regulation and control unit is connected to the common direct current bus; the primary winding is connected with a line of the first alternating current port; the secondary winding is connected with a line of the second alternating current port, and the alternating current side of the series compensation and power flow regulation and control unit is connected with the primary winding.

This invention provides a method and apparatus for suppressing subsynchronous resonance in a wind-fire bundled power transmission system with series compensation. The method includes: dq decoupling control based on stator dynamic flux compensation; superimposing the stator current of the doubly-fed induction generator (DFIG) onto the rotor reference voltage of the turbine-side converter via a transfer function; and optimizing the phase angle and amplitude characteristics of the transfer function within the subsynchronous frequency band to achieve overall optimization of the damping characteristics of the DFIG in the subsynchronous frequency band. This application achieves suppression of subsynchronous resonance in the wind-fire bundled power transmission system by comprehensively reshaping the impedance characteristics of the DFIG in the subsynchronous frequency band and optimizing its damping characteristics.

The application discloses a hidden tampering attack method based on series compensation capacitor and PMU measurement, which comprises the following steps: S1, establishing a complete dynamic model of grid-connected double-fed induction wind generator; S2, in order to improve the transmission capacity of the transmission line and reduce the energy loss in the transmission process, the DFIG wind farm is often connected with the external power grid via the series compensation line, and a series compensation line module differential equation is constructed; a PMU is installed at the terminal of each DFIG to obtain electrical quantity; S3, by giving a set of unstable characteristic roots, the capacitor value corresponding to the characteristic value is inversely solved, and the value is taken as the attack value of the capacitor in step S2; S4, the change amount caused by the attack on the measurement value is calculated, the measurement value after the system is attacked is subtracted from the measured change amount, so that the normal measurement value is obtained, and the measurement value of the PMU on the transmission line is tampered as the normal value, so that the hidden attack is realized.

The invention provides an undersea magnetic coupling resonant wireless power transmission magnetic shielding system and method, and belongs to the technical field of wireless power transmission. Comprising a high-frequency inverter, a transmitting end compensation network, a magnetic coupling mechanism, a receiving end series compensation network and a rectification filter circuit. A multi-gradient composite structure of an embedded central nanocrystalline shielding layer, a coil back nanocrystalline shielding layer and an aluminum foil shielding layer is innovatively integrated in a coupling mechanism, and the embedded central nanocrystalline shielding layer can directionally restrain central leakage magnetic fields of a circular coil and a runway coil, so that axial magnetic field diffusion is reduced; and more magnetic induction lines are concentrated in a coupling area, so that the energy transmission efficiency in a seawater environment is directly improved. The nanocrystalline shielding layer on the back of the coil has the characteristic of high magnetic conductivity, can effectively block a leakage magnetic field radiated from the coil to the interior of an aircraft, avoids electromagnetic interference to internal electronic equipment, and meanwhile reduces energy loss.

The invention provides a hybrid series compensation system and an oscillation suppression method and device. The hybrid series compensation system comprises a dynamic series compensation device and a fixed series capacitor which are connected in series on a power transmission line, the dynamic series compensation device comprises a dynamic series compensation module and a main bypass switch. The dynamic series compensation module comprises a plurality of dynamic series compensation units which are connected in series; the oscillation suppression device controls the main bypass switch to be switched off, generates a pulse width modulation reference signal and a pulse width modulation signal according to the current of the power transmission line, the voltage at the two ends of the fixed series capacitor and the voltage at the two ends of the capacitor in the dynamic series compensation unit, and drives the dynamic series compensation unit to output reverse subsynchronous voltage. And completing oscillation suppression of the power transmission line. The hybrid series compensation system provided by the invention is reliable in structure, can improve the reliability of oscillation suppression of the power transmission line, and can reduce the cost.

The application discloses an improved micro-controllable fixed series compensation device with over-current protection, which comprises a general fixed series capacitor compensation device C, an inductor group adjusting circuit and an over-current protection circuit connected in series, and disconnecting switches G8 connected in parallel at both ends of the micro-controllable fixed series compensation device; the incoming line end of the general fixed series capacitor compensation device C in the micro-controllable fixed series compensation device is connected with the incoming line end A of a power distribution cabinet through the disconnecting switch G1; and the outgoing line end of the over-current protection circuit in the micro-controllable fixed series compensation device is connected with the outgoing line end B of the power distribution cabinet through the disconnecting switch G9. The capacitor group originally used for compensating general inductive loads is designed as the inductor group which can be dynamically adjusted, so that the fixed series capacitor compensation device can be applied to the special load field for adjustment and disconnected when the power grid recovers the general load, and the fixed series capacitor compensation device is connected to the power grid.

The present application relates to the technical field of power quality treatment, and provides a power grid impedance adaptive power quality compensation system based on perturbation injection, which comprises a grid-connected point voltage and current collection terminal, a perturbation injection terminal, a frequency domain separation and background harmonic cancellation terminal, a power grid impedance online identification terminal, a compensation instruction generation terminal and a collaborative compensation execution terminal; the power grid impedance online identification terminal is used for calculating equivalent impedance parameters of the grid-connected point in each frequency band according to the frequency band response data and constructing a power grid impedance spectrum; the compensation instruction generation terminal is used for generating a compensation instruction based on the power grid impedance spectrum and real-time power quality indexes obtained from the real-time sampling data; and the collaborative compensation execution terminal is used for executing parallel compensation and / or series compensation according to the compensation instruction. The present application has the effect of improving comprehensive power quality treatment under complex working conditions.

The application discloses a wireless power transmission reconfigurable topology based on multi-resonance compensation, which comprises a primary compensation network, a primary transmitting coil, a secondary receiving coil and a secondary compensation network. The reconfigurable topology has two working frequencies f1 and f2, and corresponds to different variation ranges of a coupling coefficient k of the primary transmitting coil and the secondary receiving coil respectively. The application further discloses a wireless power transmission system applying the reconfigurable topology. Under a larger offset range, the reconfigurable topology can change the equivalent compensation network of the primary side by switching the switching frequency, and meanwhile, the secondary compensation network is still in a complete resonance state. Under different switching frequencies, the equivalent compensation network of the primary side is an LCC compensation network and a series compensation network respectively. By designing the power and coupling coefficient characteristics under different compensation networks, relatively stable output under a larger offset range is realized.