19 results about "Static var generator" patented technology

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.

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.

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.

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.

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 application discloses a new energy station wide frequency oscillation online early warning method based on a virtual shunt ratio, and belongs to the technical field of power system stability analysis and control. The method comprises the following steps: injecting a harmonic 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 the virtual shunt ratio by using vector fitting; solving the zero point of the expression to obtain station characteristic roots, and judging and warning an oscillation risk according to the position of the characteristic roots on a complex plane. The application does not need to obtain control parameters and line parameters of the new energy converter in the station, and does not need a high-power disturbance source, thereby solving the problems of high parameter dependency, difficult modeling and large calculation amount of the existing method, and realizing rapid online early warning of the wide frequency oscillation risk in the full "black box" state of the new energy station.

This invention discloses an efficient predictive voltage equalization control method and system for intra-phase modules of a cascaded full-bridge static var generator, mainly relating to the field of power electronics technology. The method includes: acquiring the capacitor voltage, bridge arm current, and total output level command of each module within the phase; calculating and ranking the influence factors of each module's switching state on the cost function based on a predictive model; selecting the first group of modules from the ranking results according to the polarity and amplitude of the total output level command, assigning a first switching state to meet the output level constraint; selecting modules with complementary switching states from the remaining modules based on the ranking results of the influence factors and complementary input criteria for a second-level allocation, further optimizing voltage equalization; setting the unassigned modules to zero level, generating the final switching state command. The beneficial effects of this invention are: by introducing complementary switching states, it unlocks the degree of freedom in voltage equalization control, significantly improving the module voltage equalization performance, and reducing the computational complexity from exponential to second-order polynomial level.

The utility model discloses a new energy ac-dc hybrid dynamic model platform of supporting multiple types of direct current transmission belongs to dynamic model experiment technical field. In the new energy ac-dc hybrid dynamic model platform of supporting multiple types of direct current transmission, the power grid simulation system includes power grid simulator, adopts full four quadrant feedback type framework, the AC simulation system includes superior line simulation unit, static var generator branch, synchronous machine branch and inferior line simulation unit, and inferior line simulation unit connects new energy simulation unit, and its built-in multiple parallel general grid-connected inverter is configured with open hardware burning interface, and adjustable tap inductance is arranged in superior line simulation unit and inferior line simulation unit, and the direct current transmission system includes the conventional direct current conversion unit and the flexible direct current conversion unit of selective connection through switch unit, and constructs at least two different types of direct current transmission topology. The utility model realizes the fine simulation of complex AC power grid characteristic and the flexible reconstruction of multiple types of direct current transmission topology.

This invention discloses a multi-source coordinated reactive power and voltage control method for offshore wind farms, including establishing a voltage balance equation at the grid connection point of the offshore wind farm containing multiple sources, and determining the reactive power demand Q at the grid connection point of the offshore wind farm during wind speed fluctuations. re Based on the wake effect criterion for offshore wind farms and the active power model of offshore wind farms under the wake effect, the maximum reactive power output value Q of the wind farm without load shearing is obtained. wmax1 Establish a reactive power optimization model and constraints for offshore wind farms that consider load reduction capacity, and solve for the maximum reactive power output value Q of the wind farm after load reduction. wmax2 When the wind farm voltage fluctuates, according to Q re Q wmax1 Q wmax2 By prioritizing the control of wind farms, SVG (Static Var Generator), and electrochemical energy storage, reactive power support for the power system is implemented, enabling multi-source coordinated reactive power and voltage control of offshore wind farms. This enhances the coordinated control capability of multiple sources participating in wind farm voltage regulation, ensuring voltage stability at the grid connection point of offshore wind farms.

The application provides a power quality comprehensive treatment system based on APF and SVG collaborative control, belongs to the intelligent power grid industry and the power quality comprehensive treatment technical field, and comprises the following steps: acquiring power grid current signals and voltage signals, detecting harmonic components and voltage deviations through a harmonic detection module; adopting a collaborative decision controller to determine a compensation strategy according to the harmonic components and the voltage deviations, and distributing compensation tasks of active power filter channels and static var generator channels; generating harmonic compensation currents through the active power filter channels to suppress high-frequency harmonics; generating reactive compensation currents through the static var generator channels to stabilize voltage fluctuations; and filtering the compensation currents through a filtering module and outputting to the power grid. The power quality comprehensive treatment system can effectively suppress power grid harmonics, stabilize voltage fluctuations, improve power quality, and is suitable for complex power grid environments.

This invention discloses an adaptive step-size electromechanical transient simulation method and system for static var generators (SVMs), belonging to the field of power grid technology. The method includes: in the initial stage of the adaptive step-size electromechanical transient simulation of the SVM, setting the simulation step size of the equipment simulation model, wherein the simulation step size includes a main step size and a small step size; after entering the simulation process, determining whether to enable the small step size startup logic based on local truncation error and controller parameters; if so, and the simulation process is not in a fault ride-through state, then the simulation is performed by starting the small step size; if it is determined not to start the small step size simulation logic based on local truncation error and controller parameters, then the simulation is performed by starting the main step size. This invention can adaptively generate the optimal simulation step size based on factors such as model parameters, system state, and considered components, improving simulation speed while ensuring simulation accuracy, and achieving efficient and accurate simulation of massive operating modes of new power systems.

This application relates to a location method, program product, and related equipment for a grid-type static var generator (SVR). The method includes: acquiring multiple sets of candidate schemes, each set including several location nodes; calculating the total power supply capacity connected to each location node, obtaining the annual maximum active power flow and values ​​of multiple preset indicators for each location node; determining the weight coefficients of each preset indicator in the corresponding location node based on the annual maximum active power flow and total power supply capacity; calculating the location base number of the corresponding location node based on the preset indicator values ​​and weight coefficients; selecting several location nodes sequentially in descending order of the location base number as candidate nodes; calculating the average location base number of the corresponding candidate schemes; and selecting the candidate node in the candidate scheme with the highest average location base number as the final location target. This invention, by connecting the grid-type SVR to the location target, can improve grid stability to meet grid operation requirements.

This utility model relates to the field of electrical equipment technology and discloses a power cabinet for a static var generator, including a power cabinet body. Inspection doors are movably connected to both the front and rear sides of the power cabinet body. A cooling fan is fixedly installed at the top of the power cabinet body and is electrically connected to the main controller inside the power cabinet body via a connecting cable. Multiple equipment racks are fixedly installed inside the power cabinet body. A ventilation mechanism is also fixedly installed at the rear of the power cabinet body. The ventilation mechanism includes an air inlet pipe and an air guide pipe, which are fixedly connected to each other. A filter box is movably installed inside the air inlet pipe. The ventilation mechanism, composed of the air inlet pipe, air guide pipe, filter box, and filter plates, allows external air to enter the air guide pipe and the power cabinet body in conjunction with the cooling fan through multiple staggered filter plates within the filter box, and then exit through the air inlet on the outside of the air guide pipe.

The present application relates to the technical field of oscillation suppression, and particularly to a wind farm oscillation suppression system and an oscillation suppression method. The output end of a PMSG wind turbine generator is connected with a grid-side converter and a step-up transformer, and is connected to a bus section with a voltage level of 35kV through the step-up transformer; a static var generator adopts a double closed-loop control structure; the bus section is stepped up to 220kV at the high-voltage side to be connected to a power grid; a wide-frequency oscillation damping controller is integrated in an inner-loop current control circuit and injects a compensation signal into a q-axis current reference value. The present application compresses a complex wind farm full-order model to a low-dimensional reduced-order model with about 65 orders. On the premise of completely retaining main dynamic characteristics such as a key oscillation mode at 20-30Hz, the model greatly reduces the calculation dimension and resource consumption, and embeds a wide-frequency oscillation damping controller with adjustable frequency response, so that the damping ratio of a target oscillation mode is increased from 0.02 to 0.19. The newly-added oscillation suppression function will not interfere with the basic power control of the wind turbine, and the low-frequency regulation of the wind turbine will not mis-trigger the intermediate-frequency oscillation.

This invention discloses an adaptive active damping control method and system for SVG (Static Var Generator). Based on traditional constant reactive power control SVG, it extracts the sub-supersynchronous components of the d-axis and q-axis voltages through a series low-pass and high-pass filter. The sub-supersynchronous components of the d-axis voltage are then processed by an adaptive damping controller to output an adaptive virtual conductance. The output of the sub-supersynchronous components of the q-axis voltage, after passing through an active damping controller, is multiplied by the adaptive virtual conductance and used as an additional term for the SVG's q-axis current reference value. This achieves adaptive enhancement of damping in the sub-supersynchronous frequency band for hybrid renewable energy power plants. This invention can be applied to sub-supersynchronous oscillation suppression scenarios for grid-connected / grid-connected hybrid renewable energy power plants connected to weak power grids.

The application provides a control method of a static var generator with the capability of maintaining the grid strength of a virtual synchronous generator, and relates to the electrical technical field.The core of the method is that the static var generator increases a control link of a current or voltage instruction value on the basis of traditional double-loop control, the control link calculates the grid inductance parameter in real time according to the operation state of the virtual synchronous generator and the grid strength, flexibly regulates and controls the instruction value of the static var generator, the static var generator combines the instruction value to carry out current loop control, coordinate transformation and PWM modulation, and finally outputs corresponding voltage and current, when the system is disturbed, the static var generator adjusts the reactive power output by changing the instruction value, so that the short-circuit ratio before and after the system is disturbed remains unchanged, thereby maintaining the grid strength of the grid connection point of the virtual synchronous generator, supporting the stable operation of the virtual synchronous generator, and improving the grid connection stability of the virtual synchronous generator.

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.

This invention provides a parallel static var generator (SVG) system and a method for synchronous modulation and communication of energy signals. The parallel SVG system comprises multiple identical individual SVG generators, with their AC outputs connected in parallel to a three-phase AC power grid. The parallel power lines serve as the common physical medium for energy exchange and information interaction between the individual SVG generators. This invention achieves synchronous transmission of critical control information between devices by directly modulating the communication signal into the compensated energy waveform output by the SVG itself, utilizing the power lines as the communication medium. This completely eliminates the need for all external dedicated communication lines and interface modules, simplifying the system structure, reducing costs, and constructing a new generation of SVG multi-generator parallel system that naturally supports seamless online access and disconnection of devices, possesses higher reliability, stronger environmental adaptability, and engineering flexibility.