699results about "Flexible AC transmission" patented technology

The invention relates to the technical field of power electronics, the embodiment of the invention provides an enhanced network construction type SVG control method and system for suppressing broadband oscillation, the method comprises a network construction type control process and an additional damping control process, and the network construction type control process at least comprises: based on a direct-current voltage and frequency loop and an alternating-current voltage and amplitude loop, the additional damping control process is carried out; generating a virtual internal potential; generating a three-phase current instruction and a modulation wave based on the virtual internal potential, the virtual impedance and the fast current inner ring; based on the modulation wave, a converter trigger pulse signal is generated and transmitted; the additional damping control process at least comprises the following steps: detecting an oscillation frequency point based on a full-band scanning algorithm; extracting an oscillation frequency point, and generating an oscillation voltage without phase shift; virtual impedance is adjusted according to the impedance amplitude and the phase relation; and correcting negative damping based on the adjusted virtual impedance.

The invention discloses a cascaded SVG-based grid-connected system high-frequency oscillation suppression method and system in a weak network state. The method comprises the following steps: generating a preliminary modulation current component by using a capacitor voltage signal of an SVG device; enabling a voltage signal of a grid-connected point to pass through a fundamental frequency wave trap, obtaining an oscillation voltage component of a grid side except a fundamental frequency, and generating a high-frequency oscillation suppression current component based on the oscillation voltage component; generating a reactive current component compensation component based on the grid-connected point voltage signal, the cascade SVG device output current signal and the grid-side current signal; adding the preliminary modulation current component, the high-frequency oscillation suppression current component and the reactive current component compensation component to obtain a cascade SVG compensation current reference value, making a difference between the cascade SVG compensation current reference value and an output current signal of the cascade SVG device, enabling the difference to pass through a current regulator, and enabling the output of the current regulator to be subjected to power grid voltage feedforward control to obtain a compensation current signal of the cascade SVG device. And the cascaded SVG bridge arm modulation voltage is obtained. According to the invention, high-efficiency grid-side reactive power control is realized, and grid-side high-frequency oscillation is suppressed at the same time.

The invention provides a dynamic reactive power compensation device control system and a control method thereof. The system comprises a TSC reactive power compensation unit, an SVG reactive power compensation unit and a coordination control unit. Object attribute information and related parameter information of reactive power generated by a power grid within a certain time period are collected, an LSTM neural network training data set is constructed and trained, the reactive power of the power grid is predicted, the reactive power needing to be compensated is calculated, timely reactive power compensation is achieved, and the reactive power compensation efficiency is improved. The problem that real-time reactive power compensation response is not timely enough is avoided, meanwhile, a prediction value advanced detection strategy is set, the problem caused by neural network model prediction overfitting is avoided, and control reliability is guaranteed. Meanwhile, a strategy that the TSC and the SVG are mixed to carry out reactive compensation is adopted, the control strategies of the TSC and the SVG are accurately optimized, the advantages of the characteristics of the TSC and the advantages of the characteristics of the SVG are fully fused, and the efficiency and quality of reactive power compensation are guaranteed.

The invention discloses an intelligent self-adaptive suppression method for oscillation of a data-driven SVG (static var generator) grid-connected system. Obtaining the capacitor voltage of the direct current side of the SVG and the actual voltage and the actual current of the grid connection point of the SVG, and respectively calculating the active power output by the SVG and the voltage amplitude output by the SVG according to the actual voltage and the actual current; a current reference value is generated through a voltage outer loop; the active power output by the SVG, the voltage amplitude output by the SVG and the voltage of the direct current side of the SVG are input into a DeePC controller to be processed, and an additional current reference value is obtained; and then the current error is obtained by adding the current reference value output by the voltage outer loop and subtracting the actual current, and then the current error is input to the voltage inner loop for processing to obtain a modulation wave voltage amplitude signal. According to the method, the oscillation of the converter grid-connected system can be suppressed under the condition that the dynamic characteristics of the converter and the conditions of the power grid are changed, and the problems of insufficient fixed structure and parameter sensitivity of the traditional SVG are solved.

The invention discloses a reactive voltage bimodal control method and system suitable for a new energy power station, and belongs to the technical field of power system voltage control. The invention provides a dual-stage control optimization mechanism based on cooperation of a distributed phase modifier and a static var compensator in order to solve the problems of difficult steady-state voltage regulation and transient voltage instability of a new energy power station caused by wind-light output fluctuation and system short-circuit capacity reduction. According to the method, in steady-state operation, minimization of grid-connected point voltage deviation and maximization of dynamic reserve capacity of a phase modifier are taken as targets, reactive power output of two types of equipment is optimally distributed, and a proper amount of dynamic margin is reserved to support transient requirements; when it is detected that the voltage sag exceeds a safety threshold value, a transient response mode is immediately switched to, that is, phase modifier strong excitation control is activated, and reactive power output, reduced due to low-voltage limitation, of the static reactive power compensator is compensated; and when the voltage enters a recovery stage, triggering the phase modifier to reduce the output in advance through a pre-action instruction, and delaying to recover the steady state mode after the switching of the static var compensator is completed. A double safety protection mechanism is embedded in the whole control process, whether the grid-connected point voltage is in a safety interval or not is verified in real time, and the minimum operation interval of the switching equipment is forced to be executed. Simulation results show that the method can remarkably improve the voltage operation index of the new energy power station, the steady-state voltage fluctuation amplitude is greatly reduced, the transient fault recovery time is obviously shortened, the overvoltage peak value is effectively restrained to be within a safe range, and the industrial problem that the steady-state adjustment precision and the transient supporting capacity cannot be both considered by single reactive power equipment is solved.

The invention provides an APF and SVG cooperative control-based electric energy quality comprehensive treatment system, and belongs to the technical field of intelligent power grid industry and electric energy quality comprehensive treatment, and the system comprises the steps of obtaining a power grid current signal and a voltage signal, and detecting a harmonic component and a voltage deviation through a harmonic detection module; a collaborative decision controller is adopted to determine a compensation strategy according to the harmonic component and the voltage deviation, and compensation tasks of an active power filter channel and a static var generator channel are distributed; harmonic compensation current is generated through an active power filter channel, and high-frequency harmonics are suppressed; reactive compensation current is generated through a static var generator channel, and voltage fluctuation is stabilized; and the compensation current is filtered through the filtering module and is output to a power grid. The electric energy quality comprehensive treatment system can effectively inhibit power grid harmonic waves, stabilize voltage fluctuation and improve electric energy quality, and is suitable for a complex power grid environment.

The invention, which relates to the technical field of the electrical automation equipment, provides a network construction type high-voltage direct-hanging battery energy storage system and method, comprising a high-voltage direct-hanging battery energy storage system, a network construction control module, an internal potential power angle limiting module and an internal potential amplitude limiting module. The high-voltage direct-hanging battery energy storage system is used for connecting battery modules in the system to direct-current buses of H-bridge circuits in a scattered mode, and the H-bridge circuits are cascaded on the alternating-current side and then connected to a middle-high-voltage power grid through a filter inductor. The networking control module generates an internal potential power angle and internal potential amplitude information by simulating the characteristics of a synchronous machine; the internal potential power angle limiting module and the internal potential amplitude limiting module are respectively used for calculating amplitude limiting values of an internal potential power angle and an internal potential amplitude in real time; and the amplitude-limited internal potential power angle and the amplitude-limited internal potential amplitude generate a modulation signal of the high-voltage direct-hanging battery energy storage system. According to the invention, current limitation and transient stability improvement in the transient fault period of the high-voltage direct-hanging battery energy storage system can be realized.

The invention discloses an H-bridge series-parallel active support type SVG system and a control method, and relates to the technical field of active support type SVGs, the H-bridge series-parallel active support type SVG system is formed by three-phase star connection of a chain structure, each phase is formed by connecting an H-bridge power module and a super capacitor power module in series, the H-bridge power module and the super capacitor power module are both controlled by the power control module; the H-bridge power module is used for providing reactive power support for the static var generator system and maintaining the stability of the voltage of the power grid by adjusting the reactive power injected into the power grid; and the super capacitor power module is used for providing active support for the static var generator system so as to realize frequency active support of the static var generator system to a power grid. According to the invention, the configuration scheme of the active support type SVG super capacitor is simplified, the overall configuration is more flexible, and the expandability is stronger.

The invention discloses an SVG-based photovoltaic grid-connected reactive power compensation method and system, and relates to the technical field of photovoltaic grid-connected compensation, and the method comprises the steps: monitoring the output power fluctuation of a photovoltaic array, and building a first electrical parameter feature vector; photovoltaic grid-connected impedance fluctuation characteristics are monitored, and a second electrical parameter feature vector is established; extracting a dynamic harmonic component and a reactive demand spectrum; generating a dynamic adjustment instruction set of SVG trigger pulse phase-amplitude according to the dynamic harmonic component and the reactive demand spectrum; and issuing the dynamic adjustment instruction set to a carrier phase shift controller of the SVG power unit for grid-connected interleaving compensation modulation. The technical problems that in the prior art, due to output power fluctuation and impedance change, harmonic waves of a photovoltaic grid-connected system are difficult to restrain, and then the electric energy quality is poor, and the system operation stability is insufficient are solved, and the technical effects that optimal modulation of SVG trigger pulses is achieved, and the electric energy quality and the operation stability of the photovoltaic grid-connected system are improved are achieved.

The invention discloses a modular high-voltage SVG circulating current suppression method. The method comprises the steps of obtaining and preprocessing module circulating current, voltage and state data; constructing an enhanced phase space fused with multiple physical quantities, extracting circulating current phase features and generating dynamic trend prediction data; calculating optimal feed-forward and feedback virtual impedance parameters based on phase characteristics and trend prediction; and generating a module control voltage correction value and a PWM control signal by applying a multi-time scale hybrid control strategy. Through hybrid control of phase space reconstruction of topology perception, multi-dimensional entropy analysis and stability guarantee, efficient suppression of the circulating current is realized, and the stability and robustness of the SVG system are improved.

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 voltage regulation and control method and system suitable for a distributed energy storage photovoltaic transformer area of a power distribution network. The method comprises the following steps: establishing a transformer area active power distribution network model for carrying out voltage regulation and control by considering distributed photovoltaic, wind power, an energy storage system, a static var compensator and a load node; a voltage regulation problem is modeled as a Markov decision process, a state space comprises multi-source power information and energy storage state information, and an action space is controlled quantities of a static var compensator and an energy storage system; a Markov decision is solved by adopting a depth deterministic strategy gradient algorithm based on Actor-Critic dual networks, a control action is generated through a strategy network Actor, and a current strategy is evaluated through a value network Critic for training; and inputting the trained strategy network based on the current observation state, outputting an optimal energy storage active / reactive power output and SVC reactive power compensation control instruction, realizing online adjustment of node voltage, and realizing stable control of transformer area voltage.

The invention relates to the technical field of power electronics, in particular to a network construction type STATCOM topological structure with a super-capacitor and a control method thereof, the topological structure is a star-shaped chain network construction type STATCOM system with a super-capacitor module power unit, the power unit comprises a super-capacitor module and an H-bridge module, and the super-capacitor module is connected with the H-bridge module in parallel; the super-capacitance module is formed by cascading three sub-modules, and each sub-module comprises a super-capacitor, a filter inductor and a DCDC circuit; the control method comprises the steps of voltage feed-forward unit phasor calculation, reactive voltage control and virtual internal potential angle calculation, virtual impedance amplitude limiting logic, bridge arm current reference instruction calculation and modulation wave instruction calculation. According to the invention, the applicability of the super capacitor module is enhanced, the design cost is saved, mutual interference between the frequency modulation characteristic and the inertia damping characteristic is avoided, the active power steady state control precision is improved, and the product safety is improved.

The invention discloses an enhanced SVG low voltage ride through method, and belongs to the technical field of electrical automation equipment, and the method comprises the steps: carrying out the three-phase voltage synthesis of a self-built voltage amplitude and a self-built voltage phase, and obtaining a current reference value through an electromagnetic square; according to the self-built voltage phase and the current reference value, a bridge arm differential mode voltage modulation wave is obtained through inner loop current control; obtaining a main circuit commutation actual value of the enhanced SVG, and obtaining a bridge arm common-mode voltage modulation wave through circulating current suppression control in combination with the self-built voltage phase; actual energy and rated energy of the enhanced SVG are obtained, and an energy modulation signal is obtained through an energy control ring; and after modulation is carried out according to the bridge arm differential mode voltage modulation wave, the bridge arm common mode voltage modulation wave and an energy modulation signal, a switching signal is generated to control the enhanced SVG, and low voltage ride through is realized. According to the invention, the problem that the enhanced SVG fails or is off-network under the condition of low voltage can be solved.

The invention provides an SVG controller modeling analysis method based on field experiment data, and relates to the technical field of electric power grids. According to the method, the high-low penetration fault test is carried out on the SVG, the field experiment data is obtained, the calculation data of the transient model of the SVG under different model parameters are combined, the least square method is adopted to carry out parameter identification, and the optimal model parameters of the transient model of the SVG controller are obtained. The process avoids modeling of complex topology in the SVG and laboratory communication protocol debugging, is suitable for testing of SVGs of various models, and is high in field test result accuracy, simple in wiring and extremely low in risk. A field test result can truly reflect transient response characteristics of station-level current and reactive power, and a modeling path based on the field test is opened. The SVG control characteristic extraction efficiency is improved, the model precision and modeling efficiency of the complex topology SVG are improved, and therefore the analysis efficiency of the SVG analysis process is improved.

The invention provides an artificial intelligence driving cascade direct-hanging SVG carrier phase shift optimization method and system, and the method comprises the steps: constructing a sensor input layer, a slow decision layer and a fast execution layer; multidimensional power grid state information collected by the sensor input layer is transmitted to the slow decision-making layer and the fast execution layer; the slow decision-making layer outputs modulation control parameters based on the reinforcement learning neural network; and the fast execution layer outputs a modulation signal based on the modulation control parameter and the multi-dimensional power grid state information, and is used for driving the cascaded H-bridge module. The system is simple in structure and low in control and construction cost, a fast and slow double-layer coordination framework is constructed, and a reinforcement learning neural network is combined in a method level, so that the nonlinear fitting capability is realized, dynamic parameter adjustment and collaborative optimization can be carried out for multiple dimensions and multiple targets, the stability of a cascade structure is enhanced, and the stability of the cascade structure is improved. And the comprehensive performance of the SVG is improved.

The invention discloses a high-voltage SVG adaptive voltage control method based on deep learning, and belongs to the technical field of power equipment, and the method comprises the following steps: S1, multi-source data collection and preprocessing: the S1, multi-source data collection and preprocessing comprises a data collection module and a data preprocessing module, the data acquisition module comprises a high-precision sensor network and acquires various data in real time; the data preprocessing module comprises missing value filling through a sliding window method, wavelet transform denoising, multi-dimensional feature proof construction and normalization processing; s2, constructing a deep learning model, wherein the construction of the deep learning model in S2 comprises a model framework module, a network parameter module and a training strategy module. According to the method, the nonlinear characteristics of the power grid are captured through the deep learning model, the method can adapt to dynamic scenes such as power grid topological structure sudden change and new energy output intermittence in real time, and in the power grid with the new energy permeability exceeding 30%, the voltage regulation error can be reduced to + / -0.5% and is remarkably superior to + / -2% of a traditional method.

The invention belongs to the technical field of active power distribution network energy storage system configuration, and particularly relates to a multi-scene-based unbalanced active power distribution network battery energy storage system configuration method, which comprises the following steps: modeling a three-phase unbalanced active power distribution network power flow, and building a multi-target BESS optimal configuration model based on an unbalanced active power distribution network; based on the established model, two-stage decomposition is carried out, and solving is carried out by adopting a mixed optimization algorithm combining particle swarm optimization and second-order cone programming; the influence of charging and discharging behaviors of the BESS in multiple operation scenes is considered, a BESS two-stage optimal configuration process based on the network loss sensitivity is formulated, and finally the reasonability and superiority of the submitted BESS optimal configuration method are verified through simulation of a typical example system. According to the method, the respective characteristics of particle swarm optimization and second-order cone programming can be utilized, and the solving efficiency and precision of the BESS optimization configuration model can be remarkably improved.

The invention discloses a differential protection method and system for a single-core phase-shifting transformer, and the method comprises the steps: respectively calculating first balance coefficients of a series winding system side and a load side and a first balance coefficient of an excitation winding through employing the current of the excitation winding as a criterion and employing the current of the series winding system side and the load side; respectively calculating a second balance coefficient of the system side of the series winding and a second balance coefficient of the exciting winding by using the phase modulation gear data, the transformation ratio of the current transformer of the system side of the series winding and the transformation ratio of the current transformer of the exciting winding; correcting the series winding system side current and the excitation winding current by using the first balance coefficient and the second balance coefficient so as to calculate a magnetic balance differential current; correcting the series winding system side current, the series winding load side current and the excitation winding current by using a first balance coefficient so as to calculate an electric balance differential current; when the magnetic balance differential current and the electric balance differential current are both larger than the braking current, differential protection acts, and differential protection of the single-core phase-shifting transformer is achieved.

The invention discloses a VSG transient stability control method based on PSS power angle compensation and integral reactive loop cooperation, and the method comprises the steps: constructing an improved rotor motion equation compensation mechanism based on a power system stabilizer, and based on the dynamic parameters of the voltages vabc and pcc at a PCC point and the currents iabc and pcc flowing into the PCC point which are collected in real time, carrying out the compensation of the current iabc and pcc at the PCC point under the condition that the working condition is that the voltage of a power grid drops greatly. The dynamic characteristic of active power is ensured; constructing a PSS parameter optimization method based on zero point position constraint; an integral link is embedded in the traditional voltage-reactive droop characteristic, integral reactive loop control is constructed, and steady-state voltage deviation is eliminated; the output compensation power angle delta and the output voltage amplitude E are cooperatively applied and converted into dq-axis voltage components Ed and Eq, the dq-axis voltage components Ed and Eq are sent to a voltage and current double closed loop, a driving signal is generated through SVPWM, and the stability of the system is enhanced.

The invention relates to a STATCOM impedance characteristic reconstruction method based on a real-time digital simulator, and belongs to the technical field of new energy electromagnetic transient simulation modeling. The method comprises the following steps: firstly, establishing a STATCOM single machine infinite bus system based on a real-time digital simulator; secondly, introducing voltage feed-forward control in a control link of the STATCOM to carry out impedance reconstruction, injecting a three-phase voltage disturbance signal into a body of the STATCOM when the STATCOM operates normally, and collecting three-phase voltage and current signals of a machine end of the STATCOM at the same time; and finally, the impedance characteristic of the STATCOM is calculated according to the collected voltage and current signals. According to the method, the impedance characteristic of the STATCOM is transformed, so that the negative damping characteristic of the STATCOM can be remarkably improved, and the oscillation risk of a power system is effectively reduced.

The invention discloses a closed-loop transformer based on a single-core symmetric phase-shifting transformer and a control method thereof. The control method comprises the following steps: establishing a target closed-loop transformer, and establishing a first connection strategy and a first access strategy based on the target closed-loop transformer; acquiring a first control target of the target loop closing transformer; and based on the first control target, the target loop closing transformer is controlled in combination with the first connection strategy and the first access strategy. By adopting the structure that the single-core symmetrical phase-shifting transformer bank and the voltage-regulating transformer bank are connected in series, the amplitude-phase decoupling regulation of the voltage phasor difference on the two sides of a loop closing point is realized, the control rule and mode are simpler, the wiring is simple and convenient, the regulation is flexible, and the regulation range is wider and the regulation precision is higher.

The invention discloses an SVG-containing power grid stability adaptive control method and system under a complex working condition, and relates to the technical field of power system stability control, and the method comprises the steps: analyzing a key operation working condition with the worst system stability; on the basis of the change condition of the operation condition, simplifying the worst key operation condition small interference robust stability problem, and obtaining an SVG control parameter set; based on the SVG reactive current collected in real time, the system adaptively selects SVG control parameters to control the stability of the power grid. According to the method, by adaptively adjusting the control parameters of the SVG, it can be ensured that the CSCR of the system is always reduced under the key operation condition of the SVG, and therefore the stability of the system is improved; the offline calculation of the control parameter set and the online adjustment of the control parameters are combined, so that the reasonability of the control parameters is ensured, and the response speed of the system is improved.

Systems and methods for supplying power (both active and reactive) at a medium voltage from a DCSTATCOM to an IT load without using a transformer are disclosed. The DCSTATCOM includes an energy storage device, a two-stage DC-DC converter, and a multi-level inverter, each of which are electrically coupled to a common negative bus. The DC-DC converter may include two stages in a bidirectional configuration. One stage of the DC-DC converter uses a flying capacitor topology. The voltages across the capacitors of the flying capacitor topology are balanced and switching losses are minimized by fixed duty cycle operation. The DC-DC converter generates a high DC voltage from a low or high voltage energy storage device such as batteries and / or ultra-capacitors. The multi-level, neutral point, diode-clamped inverter converts the high DC voltage into a medium AC voltage using a space vector pulse width modulation (SVPWM) technique.

The invention relates to the technical field of power system automation and control, in particular to a new energy SVG integration method and system based on multi-scene adaptive regulation and control. Determining a current control scene through a signal sent by a control center; dynamically adjusting the operation parameters of the SVG according to different scene classification results; and regulating and controlling the active power and reactive power of the SVG through a multi-objective optimization algorithm, and adjusting the strategy according to the SVG state classification result. According to the method, the operation parameters of the SVG are intelligently adjusted through real-time signal analysis of the control center, so that the system can optimize reactive power and voltage regulation in different scenes, and it is ensured that the overall performance of a power grid is remarkably improved. Through a multi-objective optimization algorithm, the power and voltage deviation can be controlled while multiple operation objectives are met, so that the robustness and the response speed of the system are improved.

The invention discloses a numerical oscillation suppression method suitable for electromechanical transient simulation of an SVG (Static Var Generator). The numerical oscillation suppression method is used for solving the problem of numerical oscillation caused by introduction of the SVG in the electromechanical transient simulation process. The method comprises the following steps: firstly, simultaneously considering a system state variable, a system algebraic variable and a node injection current of a power system in a transient simulation process, and constructing an electromechanical transient simulation model of the power system; carrying out difference processing on the electromechanical transient simulation model to obtain an (n + 1) moment iterative equation; and finally, carrying out alternating iteration solution combined with linear interpolation on the iteration equation at the n + 1 moment to obtain a transient simulation solution result of the power system. Therefore, in an original differential-algebraic equation set alternative solution process, alternative solution combined with linear interpolation is further introduced, so that the structure of the implicit trapezoidal integral in the SVG fast dynamic process is not damaged in the solution process, and the electromechanical transient simulation numerical oscillation problem caused by SVG introduction of a power system can be effectively inhibited.

The invention discloses a reactive compensation optimal configuration method and system of a new energy base, equipment and a medium, the method performs steady-state configuration of initial reactive capacity based on load flow calculation, can obtain effective steady-state reactive compensation configuration in a full output range, improves the robustness of steady-state reactive compensation, and improves the optimal configuration of the reactive compensation of the new energy base. A global coupling optimization architecture crossing steady state and transient state is constructed for the first time, closed-loop convergence of three optimization configuration stages is realized, so that global optimal configuration of reactive compensation is realized, and meanwhile, reasonable division and matching between two types of dynamic reactive compensation equipment, namely a phase modifier and an SVG / STATCOM, are realized; therefore, the new energy base not only can solve the transient voltage problem, but also has high power grid support strength, and the total configuration cost is greatly reduced while the requirements of standards, short-circuit ratio and transient voltage stability are met.

The embodiment of the invention discloses a photovoltaic power station SVG and inverter coordinated AVC optimization control method, and the method comprises the steps: carrying out the operation of a station system according to a voltage instruction of a power grid needing to be adjusted by a station, calculating the total reactive power demand of a photovoltaic power station, and calculating the change degree of the total reactive power output to the bus voltage, distributing the calculated reactive power output demand value to each photovoltaic power generation unit and reactive power compensation equipment in the power station according to a formulated reactive power distribution strategy so as to change reactive power output reference values of a photovoltaic inverter and an SVG, so that the bus voltage of the plant station reaches a control target value, and the voltage and reactive power automatic closed-loop control of multiple units of the new energy plant station is realized; and finally, establishing an AVC (Automatic Voltage Control) control overall framework considering the coordination reactive compensation of the SVG and the inverter of the photovoltaic power station. According to the invention, the voltage of the outlet of the station and the voltage of the low-voltage side of the box transformer substation are considered through the AVC regulation in the station, and reactive power distribution is carried out on the SVG and the inverter in the station, so that the voltage requirement is met.

The invention relates to a network construction type STATCOM (static synchronous compensator) analysis model based on DC capacitance dynamics, and belongs to the technical field of power distribution networks. The invention aims to realize the simulation of the synchronization characteristic of a synchronous machine by utilizing the similarity between the dynamic state of the direct current capacitor and the dynamic state of a generator rotor, namely a grid-building STATCOM analysis model based on the dynamic state of the direct current capacitor for the self-synchronous control of the direct current capacitor. The control structure of the internal frequency of the STATCOM on the direct current voltage is adjusted, a voltage equation under a synchronous coordinate system is deduced according to the superposition theorem and a topological graph, and the equivalent synchronous machine is obtained according to the equivalent principle, so that an equivalent rotor motion equation of the equivalent synchronous machine is obtained. According to the control mode, the internal frequency of the equipment can be adjusted to realize synchronization with the power grid, and stable operation of the direct-current side is ensured by controlling the direct-current voltage.

The invention relates to the technical field of power electronic equipment, in particular to a network construction type SVG (static var generator) device of an integrated super capacitor, a control method of the network construction type SVG device and a medium, and the network construction type SVG device comprises three network construction type static var generator branches which are connected to a three-phase alternating-current bus in a triangular form, each network-forming static var generator branch comprises an inductor and a plurality of super-capacitance bridging modules which are connected in series, and the inductor is used for smoothing current waveforms of the super-capacitance bridging modules; the super-capacitor bridging module comprises a plurality of full-bridge sub-modules and a plurality of super-capacitor sub-modules which are connected in series; the super-capacitor sub-module comprises a full-bridge super-capacitor sub-module, an interface circuit and a super-capacitor unit; and the super-capacitor sub-module is used for regulating and controlling the energy storage state according to the charging and discharging instruction. According to the invention, through integration of the super capacitor and a network construction control strategy, dynamic reactive compensation and voltage support of a power grid system are realized, system inertia is enhanced, and stability of a power system is improved.