113 results about "Static var generator" patented technology

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 relates to a multi-modal oscillation suppression method and system for a network construction type power supply grid-connected system, belongs to the technical field of power system control, and solves the problem that multi-modal oscillation of a large-scale inversion type power supply grid-connected system cannot be cooperatively and rapidly suppressed. The method comprises the following steps: when a system generates broadband oscillation, collecting grid-connected point voltage and current signals of each power station to extract a dominant oscillation mode of each power station; constructing a modal coupling matrix based on the dominant oscillation mode to extract modal coupling strength; identifying a key path of oscillation propagation in the dominant oscillation mode, and extracting a path weight and a power station participation degree; calculating the comprehensive power regulation and control weight of each power generation station in multiple modes so as to determine the power regulation quantity; and distributing the power regulation quantity to an energy storage device, a static var generator (SVG) and each power generation station according to oscillation characteristics of different frequency bands so as to cooperatively suppress multi-modal oscillation. The active / reactive oscillation energy is cooperatively adjusted, so that the oscillation energy of each frequency band is effectively suppressed.

The invention belongs to the technical field of resonance stability of a power system, and discloses a high-voltage reactance configuration method for improving resonance stability of the power system, which solves the precision defect caused by neglecting voltage fluctuation in traditional modeling by establishing a fan and static var generator precise admittance model considering DC voltage fluctuation. The dq admittance model of the alternating current system is obtained according to the nodes, connected to the alternating current system, of the fan and the static var generator, general calculation of dq admittance of the multi-node alternating current system is achieved, the limitation that only single-node modeling is supported in a traditional method is broken through, the complex stability problem is quantized into an optimizable amplitude margin index, and the stability of the system is improved. A clear basis is provided for resonance stability analysis, high reactance configuration is expanded from traditional reactive compensation to resonance stability active optimization, and the resonance stability design efficiency of the new energy grid-connected system is remarkably improved.

The invention discloses a network construction type SVG (static var generator) control method based on data-driven optimal self-synchronization. Obtaining the capacitor voltage of the direct current side of the SVG and the actual voltage and the actual current of the grid-connected point; constructing a DeePC controller input according to the actual voltage of the grid-connected point, the SVG direct current side capacitor voltage and a preset reference value, and obtaining a frequency deviation through the processing of the DeePC controller; adding the frequency deviation and a power grid rated frequency to obtain a controller frequency, and integrating to obtain a modulation wave phase signal; according to the SVG output voltage reference value, the actual voltage is sequentially processed by a voltage outer loop, current amplitude limiting and current inner loop to obtain a modulation wave voltage amplitude signal; and processing the modulated wave phase signal to obtain a modulated wave signal. According to the method, the control sequence is optimized online by directly utilizing the voltage data collected in real time, the mismatching risk of a traditional model is avoided, and a reactive power support solution with better dynamic response and autonomous toughness is provided for a new energy power grid.

The invention discloses a current-limiting control method based on a network-forming static var generator. The current-limiting control method comprises the following steps: inputting an external direct-current voltage, stabilizing the voltage by a capacitor, and then outputting the voltage to an inverter bridge; the inverter bridge generates controllable alternating current through space vector modulation; the inductive filter filters high-frequency harmonic output end voltage; the terminal voltage amplitude and phase are monitored in real time, and current-limiting control is triggered based on the phase deviation between the voltage and the virtual internal potential when the voltage of the power grid drops; the terminal voltage interacts with ideal power grid voltage at a common coupling point through power grid impedance to generate PCC voltage; pCC voltage and output current are detected, and instantaneous power is calculated; the power signal is filtered and de-noised and then a modulation instruction is generated by the current-limiting controller and is fed back to the inverter bridge to form a closed loop. The reactive power supporting voltage is injected preferentially, the voltage drop amplitude is remarkably reduced, the inertia damping supporting capacity of the system is enhanced, power grid fault recovery is accelerated, and meanwhile the voltage instability problem caused by a traditional current limiting strategy is avoided.

The invention discloses an off-line high-voltage SVG load testing method and system, and relates to the field of SVG testing, and the method comprises the steps: controlling a high-voltage static var generator to execute pre-charging operation based on the amplitude of the output voltage of a high-voltage direct-hanging energy storage converter, and starting the self-inspection work of the high-voltage static var generator after the pre-charging is completed; setting operation modes of the accompanying test high-voltage direct-hanging energy storage converter and the high-voltage static var generator, and based on the operation modes, sending power parameters by using the test controller to execute load test processing of the high-voltage static var generator; and creating and starting a test sequence by using the test controller, outputting the characteristic quantity of the high-voltage static var generator according to the operation process of the test sequence, executing off-line power grid fault adaptability performance test processing, and outputting a performance test result of the high-voltage static var generator. According to the high-voltage SVG on-load test and function test provided by the invention, a high-voltage power grid is not needed, the detection is convenient, and the influence of the test on the high-voltage power grid is also avoided.

The invention discloses a control method for supporting weak power grid operation by a network construction type SVG (static var generator), relates to the technical field of power electronics, and solves the problems that in the prior art, AC voltage cannot be actively constructed, an effective dynamic coordination mechanism is lacked with DC current control of a sending-end converter station, and the reliability of the system is poor. The system voltage supporting capability is insufficient and the direct current dynamic response performance is limited under the weak power grid working condition. According to the method, cooperative control of a network-forming SVG and an LCC-HVDC sending end converter station is adopted, specifically, the stability of power transmission of the LCC-HVDC system is ensured through a direct current control mode, the network-forming SVG generates a voltage vector reference through power synchronous control and adopts voltage and current double-closed-loop control, so that the network-forming SVG has the active voltage supporting capacity, and the stability of power transmission of the LCC-HVDC system is improved. Therefore, the dynamic response speed and the overall stability of the system under the weak power grid working condition are remarkably improved, and coordinated optimization of reactive compensation and direct-current power control is achieved.

The invention provides an active static var generator in an interleaved parallel form, and relates to the technical field of integrated circuits, and the active static var generator comprises a first three-level topology module which comprises a first three-level topology circuit and a second three-level topology circuit which are connected in parallel between a bus positive electrode and a bus negative electrode, the midpoint of a first switching tube bridge arm of the first three-level topological circuit is coupled with the second end of the first inductor, and the midpoint of a second switching tube bridge arm of the second three-level topological circuit is coupled with the second end of the second inductor. The midpoint of a first diode bridge arm of the first three-level topological circuit and the midpoint of a second diode bridge arm of the second three-level topological circuit are both coupled with the null line connecting end, and the first capacitor is coupled between the first live line connecting end and the second end coupled with the null line connecting end. The first end of the first inductor and the first end of the second inductor are both coupled with the first live wire connecting end, and the problem that the performance is poor in the scene of ultrahigh frequency response, extreme ripple suppression or multi-module flexible expansion is solved.

This utility model discloses a high-voltage static var generator that is easy to install. It includes a generator body with mounting seats on both front ends. Each mounting seat has an elongated through-hole, and the front wall of the mounting seat has a groove. A movable seat is slidably installed within the groove. An internally threaded adjustment knob is rotatably installed at the front end of the movable seat. An externally threaded sleeve is inserted into the movable seat, passing through the elongated through-hole. The internally threaded adjustment knob and the externally threaded sleeve are threadedly engaged. A support rod is rotatably installed within the externally threaded sleeve. A limiting plate is provided at the end of the support rod, and an adjustment handle is provided at the front end of the support rod. A roller seat with rollers is provided at the bottom of the generator body. This generator allows for quick assembly and disassembly by rotating the internally threaded adjustment knob and the adjustment handle, eliminating the need for tools and avoiding problems such as bolt corrosion. The rollers reduce movement resistance, making insertion and removal smoother, improving assembly and disassembly efficiency and ease of movement, and enhancing installation adaptability.

The invention relates to the technical field of power system automation and electric energy quality control, in particular to an electric energy quality optimization control method and system based on distributed collaborative decision. The method comprises the following steps: deploying synchronous phasor measurement units and corresponding edge intelligent decision nodes at a plurality of nodes of a power grid, and constructing a distributed network; each node calculates an electric energy quality characteristic index based on local data; dynamic role negotiation is carried out through local communication, and a leading controller is determined; the dominant controller fuses strategies and confidence information of local and adjacent nodes to generate a cooperative control strategy; and finally, equipment such as a static var generator and an active power filter is controlled to perform coordinated execution. Through a decentralized collaborative decision-making mechanism, the defects that centralized control is slow in response and low in reliability are overcome, rapid self-adaptive treatment on voltage sag, harmonic waves and other problems is achieved, and the response speed, the treatment success rate and the system robustness are remarkably improved.

The present application relates to the technical field of power system protection, and particularly relates to a static var generator grounding fault protection method, a system and a medium, comprising determining a grounding fault load distribution imbalance area of the static var generator according to a zero sequence grounding current characteristic quantity; in the grounding fault load distribution imbalance area, the electrical coupling stability of the fault area is evaluated according to electrical coupling correlation data between different component parts inside the static var generator, the current electrical stability state and a key influence component list are obtained, the load distribution of the grounding fault load distribution imbalance area is adjusted, and a load distribution optimization scheme is obtained; the optimal protection action timing is determined; the protection action instruction set is generated based on the optimal protection action timing and the load distribution optimization scheme, and the static var generator is controlled to perform grounding fault protection. The present application realizes fast, accurate and orderly protection action of the static var generator in the grounding fault through dynamic adjustment of the load distribution.

This invention discloses a modular direct-series converter chain, a converter, and a control method. The converter chain includes N direct-series units, each comprising: a valve string, a current-limiting unit, a bypass unit, a distributed control unit, an energy-harvesting current transformer, and a current-harvesting unit. The valve string includes M directly connected power semiconductor devices, where M is an integer greater than or equal to 1, and each power semiconductor device is connected in parallel with a buffer circuit. The current-limiting unit consists of a current-limiting bypass switch and a current-limiting inductor connected in parallel. The bypass unit includes a bypass switch. The converter includes at least three modular direct-series converter chains, which are configured in a star or delta connection, or as a three-phase bridge circuit. The converter provided by this invention can be applied to power electronic equipment such as directly connected static var generators and flexible DC transmission converters, and has the advantages of low cost and high reliability.

The invention discloses a diffusion model-based method for generating an operation scene of a network-constructing SVG (Static Var Generator) accessed to a power system, and relates to the technical field of power systems. The method comprises the steps that a power system operation scene data set covering reactive power output and power flow information of a network building type static var generator (SVG) is built by changing a reactive power reference value of the network building type SVG, and the operation scene data set comprises a power flow steady-state solution set and a condition label set; defining a loss function including a power flow balance loss item and a power conservation loss item, and constructing a conditional diffusion model with the minimum loss function as a target; training a conditional diffusion model based on the power flow steady-state solution set, the conditional label set and a loss function; and inputting the target condition label demand and the conditional scene generation quantity into the trained condition diffusion model to generate a power flow operation scene. According to the method, diversified high-quality stable generation of the power flow scene of the power system can be realized, and the flexibility and controllability of scene generation are improved.

The invention relates to the technical field of power supply systems, in particular to a photovoltaic power station-based networking SVG low-voltage control system and method.The photovoltaic power station-based networking SVG low-voltage control system comprises a data acquisition module, a decision module, an analogue simulation module, an execution module and a monitoring feedback module. Through simulation evaluation, instruction optimization, power converter control, safety monitoring, feedback and prediction and optimization, accurate control can be realized, and instruction reliability and equipment safety are improved.

This application relates to an optimized configuration method for improving the voltage stability of hollow power grids using SVG (Static Var Generator) architecture. The method includes: calculating the minimum singular value of the system Jacobian matrix based on power grid data; constructing a comprehensive evaluation model for weak nodes; calculating the node weakness index under various scenarios; constructing a static optimization configuration model; conducting analysis under a preset fault set; constructing a two-layer evaluation framework combining equipment-level and system-level analysis; quantifying the improvement of system transient voltage stability by candidate schemes; and comprehensively comparing and selecting the optimal configuration scheme that meets the requirements for transient stable voltage stability. This invention achieves accurate identification of weak nodes in the voltage stability of hollow power grids, significantly improving both the static and transient voltage stability margins of the system. It effectively solves the technical problems of voltage instability and poor transient recovery under high-proportion power electronics access, thereby improving the safety and anti-disturbance capability of power grid operation.

The utility model provides an aging test rack for a static var generator, and especially relates to the field of aging test racks for static var generators. The utility model relates to a static var generator aging test frame, and aims to solve the problems that the existing static var generator aging test frame in the prior art is low in use strength and poor in corrosion resistance, the use length of the test frame cannot be prolonged, some more articles cannot be placed, and storage and accommodation of a static var generator are affected. Comprising support plates, connecting plates and extension plates, the number of the support plates is two, the two support plates are arranged in a bilateral symmetry mode, the number of the connecting plates is two, the two connecting plates are arranged in a bilateral symmetry mode, the extension plates are arranged in inner cavities of the connecting plates, and the outer sides of the connecting plates are fixed to the inner sides of the support plates. Compared with an original testing frame, the testing frame is high in using strength and good in corrosion resistance, the using length of the testing frame can be prolonged, more articles can be placed, and storage and accommodation of the static var generator cannot be affected.

This application relates to a method, apparatus, device, storage medium, and program product for managing voltage fluctuations in a distribution network. The method includes: determining the reactive power compensation capacity of each compensation node based on a pre-established objective function of the distribution network system; the objective function aims to minimize voltage fluctuations and distribution network losses, and the compensation nodes are nodes in the distribution network system equipped with static var generators (SVAs); determining the required reactive power injection for each node in the distribution network system according to a preset voltage-power mapping matrix; determining the target state variables of each SVA in the distribution network system based on the reactive power compensation capacity of each compensation node and the required reactive power injection for each node; and correcting the voltage of each compensation node in the distribution network system based on the target state variables of each SVA, thereby managing voltage fluctuations in the distribution network system. Global optimization through the objective function, combined with local node adjustment using state variables, improves control response efficiency.

The invention relates to the technical field of direct-current power transmission, and discloses a high-voltage direct-current power transmission system based on a cascaded H-bridge static var generator, which comprises a sending-end alternating-current power grid, the cascaded H-bridge static var generator, a high-voltage direct-current power transmission module and a receiving-end alternating-current power grid, the cascaded H-bridge static var generator and the high-voltage direct-current power transmission module are respectively connected to an alternating-current bus of a sending-end alternating-current power grid; the high-voltage direct-current power transmission module comprises a sending-end converter station, a long-distance direct-current overhead line and a receiving-end converter station which are connected in sequence; the sending-end AC power grid is connected with one end of the sending-end converter station through an AC bus; the other end of the sending-end converter station is connected with one end of the receiving-end converter station through a long-distance direct-current overhead line; and the other end of the receiving-end converter station is connected with the receiving-end alternating-current power grid. According to the invention, on the basis of a network construction response design in which the static var generator and the high-voltage direct-current power transmission system based on the power grid commutation converter are combined for use, the transient operation characteristic and the system stability capability of a power system can be effectively improved.

The utility model discloses an SVG hybrid dynamic reactive power compensation device with a modular structure, which comprises screw hole pipes, a reactive power generator, a base and a connecting piece, a plurality of screw hole pipes are arranged, the surfaces of two screw hole pipes are connected with a plurality of hanging plates, a clamping seat is detachably mounted on the back of the reactive power generator, the clamping seat is connected with the hanging plates, the base is connected with the surfaces of the screw hole pipes, and the connecting piece is connected with the connecting piece. The base is supported on the bottom surface of the reactive generator; the connecting piece is connected with the end part of the screw hole pipe; the plurality of flatly laid screw hole pipes are fixed by using the connecting pieces, the combined screw hole pipes can be used for mounting the reactive generator more orderly, and the reactive generator is hung on the hanging plate through the clamping seat, so that the mounting is more convenient. The vertically-arranged screw hole pipes are fixed through the connecting pieces, a plurality of reactive generators can be stacked up and can be conveniently placed in a reactive cabinet, use is flexible and convenient, and an SVG power device meeting the requirements can be spliced according to the requirements of the voltage grade, the cascading number and the capacity range.

The utility model discloses a static var generator circuit, which is characterized in that a bus voltage detector and an inverter bridge arm current detector are arranged in the static var generator circuit to measure the voltage of a positive bus capacitor, the voltage of a negative bus capacitor and the output current of a three-phase inverter bridge arm, and the capacitance value of the bus capacitor can be calculated according to the voltage of the positive bus capacitor, the voltage of the negative bus capacitor and the output current of the three-phase inverter bridge arm. And monitoring of the capacitance value of the bus capacitor is realized. In order to ensure the normal operation of the three-level static var generator, the voltage of a positive bus capacitor, the voltage of a negative bus capacitor and the output current of a three-phase inverter bridge arm generally need to be measured even if the capacitance value of the bus capacitor does not need to be monitored, so that the voltage of the positive bus capacitor and the voltage of the negative bus capacitor are not required to be measured. According to the static var generator circuit disclosed by the utility model, a current sensor of the bus capacitor is not additionally arranged, so that the capacitance value of the bus capacitor is monitored without increasing extra cost or increasing the risk of a system.

The invention provides a control method for bus voltage difference balance of a three-level cascaded SVG (static var generator), the SVG is formed by cascading a plurality of three-level H-bridge power modules, each power module comprises an upper bridge arm and a lower bridge arm, and each of the upper bridge arm and the lower bridge arm comprises four IGBT (insulated gate bipolar transistor) switch tubes; the direct-current side is supported by a positive half-bus capacitor and a negative half-bus capacitor which are connected in series to form a positive half-bus voltage and a negative half-bus voltage; the method comprises the following steps: S1, sampling a positive half bus voltage and a negative half bus voltage of a current power module in real time, and calculating a bus voltage difference value; common-mode modulation waves with the same amplitude and the same polarity are injected into an upper bridge arm and a lower bridge arm of a three-level H-bridge power module, on the premise that the amplitude and the phase of the voltage output by the module are not changed, the duty ratio of the P state and the duty ratio of the N state are adjusted in a differentiated mode, and directional energy regulation and control over the positive half-bus capacitor voltage and the negative half-bus capacitor voltage are achieved.

This application discloses a method and system for monitoring and improving power quality in microgrids, relating to the field of power quality technology. This application achieves rapid disturbance capture and multi-time-window collaborative control through high-precision event detection and zero-crossing timing management, improving response speed and timing consistency. The diagnostic disturbance signal amplitude is limited and controllable, allowing for accurate response data acquisition without affecting system operation. Combined with a dual-port hybrid model, robust online decoupling identification of the grid's equivalent impedance is achieved. Based on dynamic feedforward and economic optimization allocation, collaborative commands for energy storage and static var generators are rapidly generated, accurately compensating for active and reactive power demands and quickly restoring voltage to its rated value. A closed-loop learning mechanism continuously updates the model and parameters, constantly improving identification accuracy and control effect, combining rapid governance, voltage accuracy, operational safety, and cost-effectiveness, adapting to complex distribution network conditions.

The application relates to the field of static reactive power generators, in particular to a current limiting method and system of a static reactive power generator based on a capacitor parameter, which collects power parameters of an alternating current side and a direct current side of the static reactive power generator respectively; determines a current parameter of the direct current side according to the power parameters; establishes a discrete time equation according to the current parameter and the power parameter of the direct current side; obtains a capacitor parameter of the direct current side according to the discrete time equation; determines a current limiting ratio according to the capacitor parameter of the direct current side; determines an output reference current of the static reactive power generator according to the current limiting ratio and a current state of a load to be compensated; and performs a current limiting operation on the static reactive power generator according to the output reference current. The application can monitor the capacitance value of an electrolytic capacitor in real time online, limit the output current according to the attenuation of the capacitance value, and thus can still limit the capacitance when the electrolytic capacitor attenuates, so that the safe operation of the static reactive power generator is ensured and the service life is prolonged.

The utility model relates to a unipolar and bipolar universal SVG (static var generator) power unit structure, which comprises a capacitor unit shell, a power unit shell and a cover plate, the cover plate is fixedly connected with the top of the capacitor unit shell, and the capacitor unit shell is connected to the top of the power unit shell; the single-stage power unit or the double-stage power unit is arranged in the power unit shell with the same specification and size, and a water cooling plate connected with the single-stage power unit or the double-stage power unit is arranged in the power unit shell. The universal power unit has the advantages that the integral structure is compact, the power unit shell is of a universal structure, single-stage and double-stage power units can be arranged in the power unit shell with the same size, and the universal structure design can flexibly meet different functional requirements. Single-stage and double-stage power unit structures can be unified in specification, a modular structure is formed, the functions of a system or a product are easily adjusted and optimized, and the diversified requirements of the market are met.

The invention provides static SVG equipment suitable for heavy load locomotive load, and relates to the field of railway power supply, the static SVG equipment comprises a three-phase MMC converter, the three-phase MMC converter comprises three phases of bridge arms, each phase of bridge arm is composed of an upper bridge arm and a lower bridge arm, the upper bridge arm comprises a plurality of cascaded half-bridge sub-models, and the lower bridge arm comprises a plurality of cascaded half-bridge sub-modules, the energy storage element of the half-bridge sub-module at least comprises a super capacitor; the voltage balancing module is used for determining the number of the half-bridge sub-modules which are put into the upper bridge arm and the lower bridge arm of each phase of bridge arm in real time, and determining the half-bridge sub-modules which are put into the upper bridge arm and the lower bridge arm of each phase of bridge arm in real time based on the number of the half-bridge sub-modules which are put into the upper bridge arm and the lower bridge arm of each phase of bridge arm in real time; and the network construction type voltage source control module is used for performing active control, reactive control and virtual impedance control, and has the advantages of adapting to heavy-load locomotive load and improving the operation stability of a power system.

The invention belongs to the technical field of electrical debugging, and discloses a photovoltaic booster station SVG on-load test method, system and device and a medium. The method comprises the following steps: checking and debugging SVG equipment and secondary equipment in the photovoltaic booster station; setting a plurality of working condition simulation schemes, performing reactive current output by the SVG, and performing on-load test on secondary equipment; acquiring actual measurement data of each secondary device, and carrying out multi-dimensional comparison on the actual measurement data and the theoretical calculation data to obtain a test result of each secondary device; and smoothly switching different operation conditions according to the various condition simulation schemes to obtain a test result under each condition, and analyzing all the test results to obtain a test result. According to the invention, multi-interval and multi-device simultaneous testing is supported. The SVG has overcurrent, overvoltage, overheating and other protection functions, the controllability of the test process is high, the risk is low, smooth adjustment can be achieved, and current sudden change impact is avoided.

The invention discloses a reactive voltage coordination control method and system for a new energy station. The method comprises the following steps: firstly, acquiring grid-connected point voltage of the station and operation data of an inverter and a static var generator (SVG) in real time; then establishing a multi-objective optimization model taking the minimum voltage deviation and the minimum reactive power regulation cost as the core; furthermore, an improved multi-target particle swarm algorithm is adopted for solving, and the improvement of the algorithm comprises the steps of introducing a self-adaptive inertia weight which is dynamically adjusted along with particle fitness, and combining a hybrid variation strategy of Cauchy and Gaussian operators, so as to improve the convergence speed and the global search capability. Maintaining the distributivity of a Pareto optimal solution set by using an elitism strategy with congestion degree calculation; and finally, selecting a compromise solution from the solution set through fuzzy membership decision, and issuing the compromise solution to each device for execution. In this way, optimal control over the distributed reactive power resources in the station is achieved, and the voltage supporting capacity and the operation economy of the new energy station are improved.

This invention discloses a method and system for managing voltage imbalance in distribution substations based on commutation switches and SVG (Static Var Generator). First, a multi-objective function for optimizing voltage imbalance across all nodes in the distribution network and an optimization model for the phase sequence of commutation switches and the SVG compensation command current are established. The three-phase voltage at each node is calculated using a three-phase unbalanced power flow calculation. A fast non-dominated sorting genetic algorithm is used to optimize the obtained phase sequence of commutation switches and the SVG compensation command current, yielding Pareto front solutions for the optimized phase sequence of commutation switches and the negative-sequence compensation current of the SVG. The Pareto front solutions are then screened, and the result that meets national standards while reducing the number of commutation switches and the negative-sequence compensation current of the SVG is selected as the optimal command. Based on the optimal command, commutation commands and compensation current commands are issued to the commutation switches and SVGs in the distribution network, respectively, achieving comprehensive management of voltage imbalance across all nodes in the distribution network.

The invention relates to the cross technical field of new energy power generation and power system stability control, in particular to a static var generator control method suitable for suppressing load power oscillation, which comprises the following steps: synchronously acquiring instantaneous voltage and current at a load end, calculating load instantaneous impedance, an impedance effective value and a change rate thereof, and calculating the load power oscillation. Constructing a virtual impedance and negative feedback damping mechanism based on the impedance change rate, finally generating a reactive current instruction with a dynamic damping characteristic, and controlling the SVG to inject reactive power when the load impedance is increased and absorb reactive power when the impedance is decreased; according to the invention, the impedance disturbance suppression module is additionally arranged in the SVG control system, so that source suppression of load power oscillation is realized.

The invention discloses a new energy station broadband oscillation online early warning method based on a virtual split ratio, and belongs to the technical field of power system stability analysis and control. The method comprises the following steps: injecting a harmonic wave small disturbance signal into a current or voltage sampling value of a new energy converter, synchronously recording a static var generator (SVG) branch current waveform and extracting a disturbance component, and calculating a virtual shunt ratio; obtaining wide frequency band data through frequency sweeping, and obtaining a domain expression of a virtual split ratio through vector fitting; and solving the zero point of the expression to obtain a station characteristic root, and carrying out oscillation risk judgment and early warning according to the position of the station characteristic root on the complex plane. According to the method, control parameters and line parameters of the new energy converter in the station do not need to be obtained, a high-power disturbance source is not needed, the problems that an existing method is high in parameter dependence degree, modeling is difficult, and the calculated amount is large are solved, and rapid online early warning of the broadband oscillation risk in the full black box state of the new energy station is achieved.