144 results about "Static var generator" patented technology

The invention discloses a control method and system for improving SVG (Static Var Generator) disturbance signal generation precision, relates to the technical field of SVG disturbance signal generation, and solves the technical problem that a current disturbance signal generated by an SVG is difficult to meet the dynamic precision requirement required by multi-frequency impedance measurement. According to the technical scheme, disturbance signal attenuation caused by SVG direct-current voltage control is calculated through an observer, after phase compensation, the disturbance signal attenuation and a direct-current voltage given value are superposed to serve as outer loop input of a voltage controller, and the outer loop input is subtracted from direct-current voltage feedback; an outer ring output is obtained through a voltage controller of an outer ring and superposed with an instruction current disturbance signal to serve as an inner ring input of a current controller, and SVG operation is controlled through a current inner ring controller and a PWM modulation instruction. The influence of a direct-current voltage outer loop on actual current disturbance signals is remarkably reduced, and the SVG can still output accurate actual current disturbance signals when instruction current disturbance signals of all frequencies are injected into the SVG.

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 provides a network construction control method and system for a static var generator without a super capacitor, and the method comprises the steps: obtaining a variable needed by the control of the static var generator, comprise a three-phase bridge arm voltage measurement value, a three-phase bridge arm voltage instruction value, a reactive power instruction value, an alternating voltage amplitude instruction value, an output reactive power measurement value, an output alternating current measurement value, an alternating voltage amplitude measurement value of a common coupling point, a direct-axis voltage measurement value and a quadrature-axis voltage measurement value; obtaining a three-phase modulation voltage through a voltage loop and an alternating current loop according to variables required by control and based on direct current voltage-frequency-phase control and reactive power-voltage droop control; and obtaining a switch tube control signal according to the three-phase modulation voltage, and completing network construction control of the static var generator according to the switch tube control signal. According to the invention, the stability of the DC voltage of the static var generator can be ensured without adding a super capacitor, and active support is provided for an AC side power grid.

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 static var generator (SVG) additional dynamic damping-based broadband oscillation suppression method, which comprises the following steps of: acquiring three-phase voltage of an SVG machine end; according to the three-phase voltage, an oscillation frequency and an oscillation amplitude are obtained; performing band-pass filtering on the dq-axis voltage corresponding to the three-phase voltage according to the oscillation frequency; obtaining phase deviation introduced by band-pass filtering, and performing phase correction on the dq-axis voltage corresponding to the three-phase voltage; performing gain adjustment on the dq-axis voltage after phase correction to obtain a dq-axis current reference value under the oscillation frequency; and according to the dq-axis current reference value under the oscillation frequency, superposing the dq-axis current reference value with the dq-axis current reference value of the SVG to obtain a total reference value for controlling the dq-axis current. Positive damping in a wide frequency band of the power grid can be effectively enhanced, the impedance characteristic of the power grid is optimized, broadband oscillation of the system is suppressed, and the safety and stability of power grid operation are 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 utility model discloses a layout structure of a rack-mounted static var generator module, which belongs to the technical field of rack var generation, and comprises a base, the upper end of the base is fixedly connected with an upper cover plate through bolts, a PCBA (printed circuit board assembly) is mounted in the base, and the PCBA is fixedly connected with the upper cover plate through bolts. A plurality of radiators are installed in the base and are arranged at equal intervals, and a rear panel is fixedly connected to the position, located below the upper cover plate, in the base. The main points of the technical scheme are that a heating source of a power module part is arranged behind a fan, and an independent air channel is formed through a wind shield, so that the heat dissipation effect is enhanced; according to the utility model, the wind shield assembly is vertically installed, convenience is brought to production, after-sales maintenance is facilitated, the size is reduced, a layer of air duct with a space is formed, the product cost is greatly reduced, and market acceptance is more easily gained.

The invention relates to the technical field of power supply management, in particular to a power system network security situation monitoring system based on SVG (Static Var Generator) networking, comprising a data acquisition module used for acquiring power grid data and processing process data; the topology analysis module is used for acquiring an equipment node table and a connection relation table according to the power grid data and updating the equipment node table; the asset mapping module is used for acquiring a mapping result and calibrating updating of the equipment node table; the security analysis module is used for judging the security condition, deducing the dangerous attack according to the judgment result and correcting the calibration process of the updating of the equipment node table; and the analysis pushing module is used for sending the deduction result to a worker. The abnormal reason is found by acquiring the network security state of the physical equipment of the power grid, and the abnormal reason is pushed to the mobile terminal of the worker, so that the worker can adjust and repair the network security problem in time.

The invention discloses a static var generator simulation method, a static var generator simulation device and a medium. The method comprises the following steps: constructing a constant voltage control model, a constant reactive power control model, a fault ride-through control model, an off-network protection model and a mode switching control model; constructing a static var generator simulation model based on the constant voltage control model, the constant reactive power control model, the fault ride-through control model, the off-network protection model and the mode switching control model; on the basis of the static var generator simulation model, reactive current is output to power grid equipment according to the specified voltage or reactive control target and the input control parameters, and the power grid equipment stably operates on the basis of the reactive current.

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 a static var generator control method and a static var generator control system, which can quickly respond to the change of the voltage of a power grid, maintain the system voltage in a set range by dynamically adjusting the output of reactive power, are particularly important for long-distance power transmission lines and heavy-load areas, and can quickly provide or absorb the reactive power when the system is subjected to large disturbance. Voltage collapse is prevented, and stable operation of the system is ensured.

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.

The present invention discloses a static VAR generator control method and system, which can quickly respond to changes in grid voltage and maintain the system voltage within a set range by dynamically adjusting reactive power output. This is especially important for long-distance transmission lines and heavily loaded areas. When the system is subject to large disturbances, reactive power can be quickly provided or absorbed to prevent voltage collapse and ensure stable operation of the system.

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 utility model belongs to the technical field of cable branch boxes, and relates to a cable branch box supporting load side electric energy quality management, which comprises a box body, and an SVG static var generator, an isolating switch, a molded case circuit breaker, an emergency electricity taking interface and a wireless communication module are arranged in the box body. The molded case circuit breaker is electrically connected with the isolation switch and the emergency power taking interface. The SVG static var generator is electrically connected with the wireless communication module. The SVG static var generator comprises a static var generator body, a three-phase current transformer and a liquid crystal display screen. The three-phase current transformer is installed in a three-phase main incoming line loop in the box body. An SVG static var generator is additionally arranged, current data are collected through a current transformer, reactive current is calculated, the problem of electric energy quality is solved, and the data are sent to a main station through a communication module; emergency power supply is realized by accessing an external power supply through the emergency power-taking interface, and the power supply reliability is improved.

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.