339 results about "Power oscillation" patented technology

The invention discloses an energy storage power station state evaluation method and system based on real-time demand analysis, and relates to the technical field of power station state evaluation, and the method comprises the steps: obtaining the real-time operation data of an energy storage power station; the real-time operation data comprises voltage data, current data, temperature data and power data; based on the real-time operation data, establishing an energy storage power station real-time evaluation index system under the demand of a power grid system; and based on the energy storage power station real-time evaluation index system, establishing an energy storage power station performance comprehensive evaluation model, and performing energy storage power station state evaluation according to the energy storage power station performance comprehensive evaluation model. According to the method, operation data are acquired from multiple dimensions of a PCS converter, a battery body and a PCC point, a systematic evaluation index system of four requirements of power grid frequency modulation, peak regulation, voltage regulation and power oscillation suppression is combined, and an evaluation method of combining dynamic fuzzy comprehensive evaluation and adaptive weight dynamic adjustment is adopted; and comprehensive and accurate evaluation of the state of the energy storage power station is realized.

The invention discloses a VSG-based energy storage converter three-parameter coordinated adaptive control method, which comprises the following steps of: acquiring three-phase voltage and current of a VSG output port and three-phase voltage data of a grid-connected point, and calculating an output power difference, an output power change rate and a power grid angular frequency difference of the VSG; the power instruction is corrected by combining the power instruction and the power grid angular frequency difference, and the adjustment process of the VSG is divided into six stages according to a power fluctuation curve; the rotational inertia, the virtual damping and the virtual inductance are adjusted according to the power difference and the power change rate in the six stages; the virtual inductor is finely adjusted by combining the VSG output power difference and the output power change rate, and smooth transition of the virtual inductor and smooth adjustment of the power are achieved; the value of the virtual inductance is compared with the initial value of the virtual inductance, and the virtual impedance is subjected to initial value regression operation, so that the power equalization and the system stability of the parallel VSG are not influenced. The method has obvious effects on power oscillation suppression and dynamic performance improvement of the energy storage converter system based on the VSG.

The invention discloses a network construction type diesel-storage parallel system power oscillation suppression method and system for an oil field impact load, and the method comprises the steps: calculating the output power of an energy storage converter and the total power of a load after the impact load is input through detecting the output end of the energy storage converter and the voltage and current of the load, and obtaining an output angular frequency compensation value through calculation; and adjusting the output angular frequency of the energy storage converter in real time by using the output angular frequency compensation value, so that the angular frequency of the energy storage converter quickly tracks the angular frequency of the diesel generator, thereby reducing the angular frequency difference between the energy storage converter and the diesel generator, and effectively inhibiting the low-frequency power oscillation of the network construction type diesel storage parallel system under the oilfield impact load.

The invention provides a super-computing center battery charging and discharging strategy optimization method and system based on reinforcement learning, and the method comprises the steps: obtaining a real-time operation data set of a super-computing center battery system in real time, and carrying out the load feature extraction of the real-time operation data set; the method comprises the steps of generating a load feature set of a battery system, inputting the load feature set into a pre-trained reinforcement learning strategy network, performing charge and discharge strategy priority matching processing on the load feature set, generating a priority ranking result of a target charge and discharge strategy, adjusting a current charge and discharge strategy set according to the priority ranking result, generating an optimized charge and discharge strategy set, and outputting the optimized charge and discharge strategy set. And performing charging and discharging operation based on the optimized charging and discharging strategy set, and collecting battery performance feedback data after the charging and discharging operation so as to iteratively update strategy matching parameters of the reinforcement learning strategy network. According to the method, the problems of over-charging and over-discharging and power oscillation caused by lagging response of environmental parameters in a traditional fixed strategy are solved, and autonomous decision-making of multi-target optimization can be realized without depending on artificial experience rules.

The invention discloses an energy regulation and control method of a photovoltaic system, and relates to the field of energy regulation and control of the photovoltaic system, and the method comprises the steps: collecting comprehensive state data in a time period T, processing the comprehensive state data, and obtaining time sequence state data; performing primary processing on the time sequence state data by using moving average filtering to obtain a smoothed initial data set, taking the initial data set as observation input of Kalman filtering, further smoothing the data by using the Kalman filtering to obtain a high-precision gain data set, and using improved Pamp; performing disturbance judgment on the gain data set through an O algorithm; according to the method, power oscillation of voltage in a prediction interval is eliminated by using an IncCond method, subdivision demand judgment is performed, a maximum power point is accurately positioned by using a subdivision search method, and the maximum power point is output as a working point of the system, so that energy regulation and control of the photovoltaic system at the maximum power point are realized, and the energy efficiency of the photovoltaic system is improved.

The invention relates to the technical field of photovoltaic energy storage systems, and discloses a power regulation method, device and equipment for a photovoltaic energy storage system and a storage medium, and the method comprises the steps: carrying out the real-time collection and wavelet decomposition of voltage and current parameters of a photovoltaic array, and obtaining power fluctuation components and power trigger signals of different frequencies; executing power vector analysis to obtain an oscillation mode characteristic parameter set and an oscillation suppression strategy; constructing a photovoltaic side feedforward trigger channel and an energy storage side feedback trigger channel, and obtaining a coordination trigger instruction of the photovoltaic side and the energy storage side; and performing multi-objective optimization decomposition and slope limitation processing on the coordination triggering instruction to obtain a voltage reference value of the photovoltaic MPPT controller and a current reference value of the battery charging and discharging controller, thereby realizing accurate identification and prediction of different frequency power fluctuation components, realizing collaborative cooperation of photovoltaic side feed-forward and energy storage side feedback, and improving the reliability of the system. And the power oscillation risk caused by control mode switching is avoided.

The invention discloses a hydroelectric generating set forced mechanism low-frequency oscillation elimination method and device, and the method comprises the steps: monitoring the power oscillation inherent frequency of a hydroelectric generating set at different load sections, and determining the resonant frequency early warning range of the pressure pulsation of a draft tube of the hydroelectric generating set according to the power oscillation inherent frequency of the hydroelectric generating set; a hydroelectric generating set combination strategy considering the vibration area is calculated to obtain the resonance adjustable load capacity, and the guide vane opening degree corresponding to each hydroelectric generating set is reversely calculated according to the resonance adjustable load capacity; when it is monitored that the hydroelectric generating set draft tube pressure pulsation frequency is within the resonance frequency early warning range and the amplitude exceeds the set value, the multiple hydroelectric generating sets are controlled to act in a coordinated mode to adjust the guide vane opening degree. Under the condition that a prime motor and a water diversion system are not changed, forced power oscillation accidentally occurring in the vibration crossing area of the large hydropower station can be rapidly eliminated.

The invention relates to a charging pile AC / DC power dynamic cooperative regulation and control system, which belongs to the technical field of charging piles and comprises a power grid parameter acquisition module, a charging load characteristic analysis module, a coupling effect calculation module, a power distribution optimization module and a cooperative control execution module. The system can accurately distribute power to vehicles which really need and can be efficiently utilized, mutual interference between modules can be effectively restrained, power oscillation and cascading failures are avoided, the stability and reliability of the whole charging station under high-density operation are guaranteed, the robustness of the system is enhanced, and the service life of the charging station is prolonged. A dynamic and globally optimal balance point is found and maintained among three mutually restricted targets, namely, power deviation, coupling power and power grid constraint, by establishing and solving a multi-target optimization model containing power deviation, coupling power and power grid constraint, the stability of the multi-target optimization model is guaranteed, and the power grid safety is maintained, which cannot be achieved by any single-target or static-weight control strategy.

The invention relates to a power electronic technology and an energy storage technology, and aims to provide a multi-machine parallel grid-connected coordination control method for a voltage source type medium-voltage energy storage system. Comprising the following steps: adding virtual impedance into an original line based on a virtual impedance method, and keeping the total line impedance between each battery energy storage system and a grid-connected point to be the same; adding a self-adaptive damping module in an active frequency link according to a self-adaptive damping parameter method, and calculating an average value of output power of each virtual synchronous machine; and obtaining a new frequency reference value of an active-frequency loop through adaptive damping calculation, substituting the new frequency reference value into subsequent voltage and current double-loop control, and realizing suppression of active power oscillation in combination with treatment of virtual impedance. According to the method, the difference between the hardware parameters and the software parameters of the multi-machine parallel system is comprehensively considered, and compensation is performed by using the virtual impedance method to reduce the active oscillation problem caused by the line parameter difference; the dynamic process is improved through a self-adaptive damping method, active power oscillation can be suppressed, and the system operation stability is improved.

The invention discloses a laser wireless energy transfer dynamic MPPT control method based on an RL-PSO hybrid algorithm and a reconfigurable array system, and aims to solve the problems of power oscillation and mismatch loss caused by light spot offset of a photovoltaic array under laser dynamic irradiation. According to the method, reinforcement learning (RL) and particle swarm optimization (PSO) are fused, dynamic parameters such as the light spot moving speed and irradiance are sensed in real time through the RL, the inertia weight and learning factors of the PSO are adjusted in a self-adaptive mode, and collaborative optimization of global search and local tracking is achieved. According to the system level, a reconfigurable photovoltaic array is designed, and according to data of a light spot position sensor, battery series-parallel topology is dynamically adjusted through a switch matrix, and current matching is optimized. According to the method, double-loop control is adopted, wherein an outer-layer RL decision module dynamically switches PSO working modes according to the environment, and an inner-layer PSO module optimizes the working voltage. The system efficiency in a dynamic scene can be improved by 15%-30%, mismatch loss is reduced by 40% or above, and the method is suitable for unsteady-state energy supply scenes such as unmanned aerial vehicles and mobile robots.

The invention relates to the technical field of charging systems, and particularly discloses a power factor improvement control method for a charging system, and the method comprises the steps: obtaining a time sequence of an input current and a time sequence of an input voltage; local time sequence correlation and time sequence feature significant aggregation of the input current and the input voltage are carried out by adopting a data processing and analysis algorithm based on artificial intelligence; therefore, a recommended duty ratio proportion value is intelligently obtained based on an interactive response relation between time sequence aggregation representation characteristics of the input current and the input voltage. Therefore, the control strategy can be adjusted in time according to the time sequence dynamic change of the input voltage and current, so that a high power factor can be kept even under the condition that the load condition changes, meanwhile, power oscillation and voltage fluctuation of a power grid caused by excessive compensation are prevented, and the stability, the reliability and the intelligent degree of the system are improved.

The invention relates to the technical field of virtual impedance self-adaptive control of energy storage converters, in particular to a virtual impedance self-adaptive control method of a grid-forming type energy storage converter, which comprises the following steps of: acquiring three-phase voltage and current of a grid-connected point in real time; performing phase-locked loop processing and coordinate transformation to obtain a d-axis voltage, a q-axis voltage and a current under a synchronous rotating coordinate system; calculating instantaneous power, and obtaining active power and reactive power; virtual resistance and virtual inductance are calculated according to power fluctuation through an adaptive algorithm; the virtual impedance equation generates a voltage drop compensation signal; and superposing the compensation signal and the reference voltage to generate a new modulation wave, and inputting the new modulation wave into the pulse width modulation module to realize power oscillation suppression and stable operation. According to the method, the problems between damping enhancement and loss reduction in network construction type control are solved, the dynamic and steady-state performance of the converter is improved, and a key technical support is provided for large-scale and high-reliability application of the network construction type energy storage converter in a novel power system.

The invention discloses a power oscillation suppression method and a power oscillation suppression system for a multi-construction-network type converter parallel system, which relate to the technical field of converter control and comprise the following steps of: acquiring voltage, current and voltage frequency output by a three-phase converter at a grid-connected point in the multi-construction-network type converter parallel system; calculating active power and reactive power and inputting the active power and the reactive power into the virtual oscillator; according to the voltage frequency and the rated frequency, system power reference compensation is obtained through an introduced proportional differential controller, then the active power and an active power reference value are combined, frequency deviation is obtained through an active droop link of a virtual oscillator, and then a voltage phase angle is obtained through calculation; meanwhile, the reactive power is subjected to a reactive power control link of the virtual oscillator to obtain a voltage amplitude; and calculating a system reference voltage according to the voltage amplitude and the voltage phase angle, and performing real-time adjustment on the output of the three-phase converter through voltage and current double-closed-loop adjustment and PWM (Pulse Width Modulation) control so as to suppress the frequency oscillation of the system.

The invention belongs to the technical field of energy storage systems, and provides a multi-scale energy storage system control method and system, and the technical scheme is that a centralized access mode is adopted, an energy storage device is connected to a wind power grid-connected bus, damping control is adopted, a power oscillation damper is additionally arranged, and damping is increased by controlling the output of a DFIG; mode damping, filtering and phase compensation are improved through a POD control structure installed on the machine side; low-frequency oscillation is suppressed through energy storage, positive damping is provided for frequency oscillation of the system, when low-frequency oscillation occurs in the frequency of the system, the energy storage dynamically adjusts the active output according to the frequency change of the system, the control modes mainly include droop control, inertia control and nonlinear control, power compensation and peak load shifting are achieved, the energy storage utilization rate is high, and the energy storage efficiency is high. Damping control is adopted for a multi-scale energy storage system and a new energy system, a power oscillation damper is additionally arranged, and the small disturbance stability of a high-permeability regional power grid is enhanced.

The invention provides a virtual inertia and virtual damping-based control method for a network-building type energy storage system, and belongs to the technical field of network-building type energy storage system control. The method comprises the following steps: firstly, based on target control parameters obtained by applying small disturbance quantity and energy consumed by direct-current energy storage equipment, transforming an expression after derivation of virtual rotor storage energy; then respectively calculating a variable virtual inertia and a variable virtual damping coefficient by means of a synchronous machine swing equation or based on a damping ratio of an active power transfer function and a target control parameter, and respectively calculating a target virtual inertia and a target virtual damping coefficient based on the target control parameter and based on the variable virtual inertia or the variable virtual damping coefficient; and finally, based on the calculated target virtual inertia and the target virtual damping coefficient, controlling the network-building type energy storage system. According to the scheme, the energy storage demand, the active power oscillation and the control frequency oscillation can be reduced, and the method has relatively high usability and practicability.

The invention discloses a control method of a current source type multi-terminal direct current power transmission system, and relates to the technical field of electronic power control. In the current source type multi-terminal direct current power transmission system, a converter station at a rectification side is an LCC converter station, and a converter station at an inversion side comprises at least two CLCC converter stations which are connected in parallel; the method comprises the following steps: a converter station at a rectification side adopts constant current control and constant minimum firing angle control; and the converter station at the inverter side adopts master-slave control. According to the method, the problem of commutation failure can be avoided, the problem of power reverse transmission due to power oscillation and loss caused by fault commutation failure of a current source type multi-terminal direct current system can be avoided, and the problems of low MMC voltage level and power capacity and high price can be avoided.

The invention relates to the technical field of energy storage systems, in particular to a symmetric / asymmetric fault ride-through control method for a network-forming type energy storage converter, which comprises the following steps of fault detection and classification, adaptive control target decision and multi-mode unified control. According to the method, adaptive and intelligent fault ride-through is realized, the control accuracy and efficiency are improved, the adaptability and robustness of the energy storage system in different power grid fault scenes are enhanced, the center of gravity is dynamically adjusted and controlled according to the charge state of the energy storage system or the received power grid dispatching instruction, the maximum utilization of system resources is realized, and the power grid fault ride-through efficiency is improved. The voltage and frequency support is provided for the power grid, the response speed is far higher than that of traditional deviation adjustment, the voltage support effect at the moment of a fault is greatly improved, sudden change of power and current is effectively prevented, secondary impact on the recovered power grid caused by off-grid of the converter or power oscillation is avoided, and the friendliness of network forming equipment is embodied.

The invention provides a virtual inertia adaptive control method, device and system, and relates to the technical field of inverter system control. The method comprises the following steps: calculating a reference current value according to a power reference value and an actual output voltage; calculating a current deviation value according to the reference current value and the actual output current value; outputting the current deviation value to an adaptive resonance controller to obtain a compensation control voltage signal; inputting the compensation control signal to an AHO virtual oscillator to obtain a reference value of the output voltage of the inverter; and controlling the output of the three-phase inverter circuit according to the reference value of the inverter output voltage. Wherein the adaptive resonance controller carries out adaptive control through the proportional parameter and the proportional resonance inertial parameter. The virtual inertia output can be dynamically adjusted according to the real-time requirement of the system, the overshoot phenomenon caused by power oscillation is effectively suppressed while the frequency stability is met, and the capacity of the system for resisting sudden load change and frequency disturbance is enhanced.

The invention provides a method for suppressing low-frequency power oscillation of a multi-machine interconnection system. The direct suppression of the low-frequency power oscillation of the multi-machine interconnection system is realized by detecting the interaction power parameters among the grid-forming inverters in real time and superposing the differential signals of the interaction power parameters to the power control loop through the preset feedback gain coefficient. And by dynamically adjusting the equivalent system damping coefficient, the dynamic stability of the parallel inverter system is remarkably improved. Compared with a traditional method depending on a fixed damping coefficient or indirect current control, the method does not need a communication cooperation mechanism, and can achieve the quick attenuation of the power oscillation mode only based on a local signal. Meanwhile, the introduction of a differential feedback mechanism can accurately capture the dynamic change trend of power interaction, avoids the oscillation divergence risk caused by the sudden change of line impedance or load, and improves the robustness in a weak power grid and other scenes.

The invention discloses an active and reactive comprehensive oscillation quantity minimization cooperative control method under a current constraint condition, and the method comprises the steps: analyzing an inverter side current converter in a power grid voltage imbalance state, and quantifying the frequency doubling fluctuation quantity of active power and reactive power caused by a negative sequence component; a third harmonic voltage compensation method is adopted to suppress negative sequence current, the third harmonic voltage compensation amount of the converter is dynamically adjusted, and three-phase current balance is regulated and controlled; on the basis of active and reactive power fluctuation suppression of a negative-sequence current compensation method, an optimization function with the purpose of minimizing the comprehensive fluctuation quantity of active power and reactive power is constructed by utilizing controllable negative-sequence current compensation quantity and eliminating frequency doubling fluctuation quantity of active power and reactive power, and an optimal negative-sequence current compensation scheme is solved in real time by adopting a particle swarm optimization algorithm. Cooperative suppression of three-phase current balance and power oscillation is achieved, and the operation stability and the power transmission capacity of the inverter side converter under an asymmetric fault are remarkably improved under the current amplitude limiting condition.

The invention discloses a method for suppressing power oscillation of a network construction type energy storage converter. The method comprises the following steps: building a network construction type energy storage converter simulation model; measuring and recording the output power waveform and the given power of the network-forming type energy storage converter; changing the control parameters of the network-forming energy storage converter to suppress the fluctuation of the output power, and recording the control parameters at the moment; taking the output power waveform, the given power and the control parameter as the input of the neural network; deploying the trained neural network in a first controller, and transmitting the real-time power to the neural network in the first controller by a second controller to obtain a control parameter; the converter control strategy is operated in the second controller, the first controller transmits the obtained control parameters to the second controller, and the control parameters are adjusted on line. According to the method, the change of the power grid environment is monitored in real time, and the parameters of the network-forming type energy storage system are dynamically adjusted according to the change, so that the system can stably run and the power oscillation is effectively inhibited.

The invention relates to a new energy power generation technology, and aims to provide an active power decoupling method for introducing a three-phase voltage unbalance degree. Comprising the steps that voltage and current double-loop control is adopted for a three-phase energy storage converter of the T-type three-level topology; detecting a three-phase instantaneous voltage of the output side of the converter to obtain a three-phase voltage amplitude unbalance degree; pre-judging the unbalance degree of the voltage amplitude of the power grid, and continuing to execute if a preset condition is met; the three-phase voltage amplitude unbalance degree is introduced into three-phase power grid voltage dq conversion and calculation of a three-phase current feedback loop, and finally a PWM control signal is generated; and each switching tube in the converter executes actions based on the PWM control signal, so that the three-phase power is kept equal, and the frequency doubling power ripple is suppressed. According to the invention, frequency doubling ripple power oscillation under the working condition of unbalanced three-phase power grid voltage amplitude can be effectively eliminated, and the suppression target of DC side frequency doubling power ripples is realized; no additional hardware topology is added, an original control ring is reserved, and detection and control of positive and negative sequence components are omitted.

The invention discloses a VSG negative sequence harmonic current control method under an asymmetric fault of a power grid, and the method comprises the steps: analyzing an instantaneous expression of VSG output power under an asymmetric working condition, and obtaining a quantitative relation between power frequency doubling fluctuation and positive and negative sequence voltage and current; introducing a direct current part of VSG reactive power output into a reactive power control ring, and constructing reactive power control ring control; positive sequence voltage current and negative sequence current are independently controlled in a positive and negative sequence separation mode; and unifying the positive sequence modulation signal and the negative sequence modulation signal to obtain a total PWM modulation wave signal, and setting a reference value for a negative sequence current loop, so that the VSG output current is balanced. According to the invention, the influence of power oscillation on the control effect of the VSG can be improved, the negative-sequence current harmonic waves can be suppressed, and the electric energy quality of the VSG is greatly improved.

The invention provides a virtual synchronous machine grid-connected control method and device and a readable storage medium, and relates to the technical field of electric power. The method comprises the following steps: calculating grid-connected active power and actual reactive power according to inverter parameters and power grid parameters of previous grid-connected control; determining the output voltage of the inverter according to the actual reactive power and the reference reactive power; inputting the grid-connected active power, the reference active power and the rated angular frequency into a first-order low-pass filtering module to obtain a frequency deviation and a frequency change rate, and adaptively adjusting the virtual inertia according to the power difference and the frequency deviation; updating the output angular frequency of the inverter according to the sum of the frequency deviation and the rated angular frequency; and performing voltage and current double-closed-loop control on the output voltage and the output angular frequency to obtain a modulated wave signal, and performing sine pulse width modulation based on the modulated wave signal to obtain a switching control signal of the inverter. Therefore, the active power oscillation is eliminated, the active steady-state deviation is reduced, and the frequency deviation and the frequency change rate are effectively inhibited.

The invention relates to an electric energy coordinated distribution system capable of quickly clearing faults of a power distribution network, which belongs to the technical field of power system protection and control, and comprises the following steps: generating a regional reference impedance matrix in advance based on power grid static topological data and load flow calculation; the system comprises an instantaneous feature analysis module, an evolution trend analysis module, a system stability evaluation module, a collaborative response evaluation module, a fault type judgment module and a response strategy generation module, the fault recognition time is shortened, improvement is carried out compared with a traditional method, the collaborative response precision of the distributed power supply is improved, and the system reliability is improved. The power oscillation risk is reduced, the transient stability margin of the system is improved, and the anti-disturbance capability is enhanced; the fault power failure time is reduced, the distributed energy utilization rate is improved, the new energy consumption space is increased, and the updating period of traditional protection equipment is delayed.

The present invention discloses an optimized control strategy for the transient characteristics of a distributed generation system, including the following control structures: an output power measurement unit, a parameter controller, a voltage regulation controller, a primary frequency modulation controller, an output power response optimization controller, and SPWM modulation. The distributed generation system realizes functions such as output power monitoring, operating parameter setting, voltage control, primary frequency modulation, inertia and damping simulation, rapid oscillation suppression, and inverter shutdown control through the above control structures. The present invention will solve the problem that when a grid-connected inverter is connected to the end of the power grid, it is vulnerable to frequency fluctuations and generates serious power oscillations, and can effectively optimize the transient response of the system to grid connection and achieve rapid suppression of output oscillations.

The invention provides a thermal power generating unit power oscillation on-line monitoring system, and relates to the technical field of monitoring, an output power sequence, a frequency sequence, an operation parameter set and a control instruction set are acquired through a data acquisition module, and a data processing module performs denoising, abnormal value elimination, time alignment and resampling on an original data set to generate a processed data set; the oscillation analysis module calculates an oscillation characteristic index based on the processing data set and generates an oscillation judgment result; the early warning module outputs an early warning signal when determining that power oscillation exists; the linkage control module generates a control instruction after receiving the early warning signal, and cuts off a frequency modulation action loop or adjusts frequency modulation related parameters; and the data storage module is used for carrying out structured storage on the processing data set, the oscillation characteristic indexes, the oscillation judgment result, the early warning signal and the control instruction. Therefore, real-time monitoring, accurate identification and rapid linkage control of power oscillation of the thermal power generating unit can be realized, and the operation stability of the unit and the safety of a power grid are improved.

The invention discloses a power feedback and phase compensation-based oscillation suppression strategy for a multi-configuration-network converter grid-connected system. The multi-configuration-network converter grid-connected system mainly comprises the following modules: a power calculation module, a virtual speed regulator module, a virtual rotor module, a reactive power-voltage droop control module and a voltage and current double-closed-loop module. In the virtual rotor module, the output active power and the output power angle are subjected to a differential link to construct a power feedback loop, the difference value between the output angular frequency of the virtual rotor and the rated power grid frequency is used as the phase compensation amount, and a power feedback and phase compensation strategy is applied; the problem that after grid connection, a multi-grid converter is prone to being disturbed by the power grid frequency to generate violent power oscillation is solved.

The invention discloses a forced power oscillation disturbance source positioning method based on KDE transfer entropy causal analysis, and belongs to the technical field of power system operation and maintenance. The forced power disturbance source positioning is realized by analyzing the causal relationship between disturbance source and non-disturbance source unit measurement signals in the forced power oscillation process of the system. According to the method, the causal analysis method is used for solving the forced power oscillation disturbance source positioning problem, dependence on a system model and parameters is eliminated, rapid online positioning of the forced oscillation disturbance source can be achieved only according to measurement data, and the positioning precision and positioning efficiency of the forced oscillation disturbance source are effectively improved.

The invention discloses a reactive power coordination control method and system. The method comprises the following steps: acquiring a related voltage value of a new energy station; calculating a voltage effective value according to the related voltage value of the new energy station, judging whether the voltage effective value meets a threshold condition and integral counting delay or not, and outputting a corresponding adjustment instruction according to a judgment result; and transmitting the adjustment instruction to the SVG, setting the reactive power reference value to be the maximum value after the SVG receives the adjustment instruction, and sending out the maximum reactive power. According to the invention, the reactive power regulation capability of the SVG is fully utilized, so that the voltage in the station can reach a reasonable degree, repeated ride-through and power oscillation of a new energy unit caused by great voltage drop are avoided, and stable operation of a power system is facilitated. The control method is simple and reliable to implement, can be integrated into a background monitoring system of a new energy station as a functional module, can be flexibly put into and withdrawn as required, and is low in control cost and cost and good in control effect.