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CN-122026433-A - Coordinated control method, system, equipment and storage medium for multi-machine parallel SVG

CN122026433ACN 122026433 ACN122026433 ACN 122026433ACN-122026433-A

Abstract

The invention discloses a coordinated control method, a system, equipment and a storage medium of a multi-machine parallel SVG, which relate to the technical field of dynamic reactive compensation of a power system and comprise the steps of constructing a direct-hanging SVG simulation model by adopting a chained SVG circuit topological graph, carrying out simulation analysis to formulate a control strategy, constructing a control strategy real-time verification platform verification control strategy, converting a communication conversion protocol of the SVG control system into a real-time simulation communication adaptation protocol supported by the simulation system to complete early-stage principle verification, adopting a rotating coordinate system PI double-closed loop grid-connected control strategy to generate reactive current loop setting, executing the coordinated control strategy under a multi-machine parallel scene, inhibiting reactive power hedging and unifying dynamic response. According to the method, the reactive current loop setting is generated by adopting a rotating coordinate system PI double closed loop grid-connected control strategy, so that unified setting and consistent response with current inner loop fast tracking and outer reactive target mapping as cores are realized.

Inventors

  • XU JINSONG
  • TAO HUI

Assignees

  • 华电兴化太阳能发电有限公司

Dates

Publication Date
20260512
Application Date
20260212

Claims (10)

  1. 1. A coordination control method of a multi-machine parallel SVG is characterized by comprising the following steps: Constructing a direct-hanging SVG simulation model by adopting a chained SVG circuit topological graph (100), and carrying out simulation analysis to formulate a control strategy; Constructing a control strategy real-time verification platform (200) to verify the control strategy, converting a communication conversion protocol of the SVG control system into a real-time simulation communication adaptation protocol supported by a simulation system, and completing early-stage principle verification; and generating reactive current loop setting by adopting a rotating coordinate system PI double closed loop grid-connected control strategy, executing a coordination control strategy under a multi-machine parallel scene, inhibiting reactive hedging and unifying dynamic response.
  2. 2. The method for coordinated control of multiple parallel SVGs according to claim 1, wherein said employing a chained SVG circuit topology graph (100) comprises, The power units in the phases are connected in series and connected in a three-phase star shape to carry out high-voltage output, and the power units adopt a general H-bridge topology.
  3. 3. The coordinated control method of the multi-machine parallel SVG according to claim 2, wherein said constructing a direct-hanging SVG simulation model, performing simulation analysis and formulating a control strategy comprises, And constructing a direct-hanging SVG simulation model, performing simulation analysis on voltage stability, voltage fluctuation, three-phase voltage unbalance degree and harmonic waves before and after access, and formulating a control strategy.
  4. 4. The coordinated control method of a multi-machine parallel SVG according to claim 1 or 2, wherein the build control strategy real-time verification platform (200) verifies control strategies comprising, Carrying out parameter design and controller realization by combining theoretical analysis and computer simulation; the control strategy based real-time verification platform (200) verifies strategy functionality and adaptability.
  5. 5. The method for coordinated control of multiple parallel SVGs of claim 4, wherein said control strategy real-time verification platform (200) comprises a test management subsystem (201), a real-time simulation subsystem (202), a signal interface subsystem (203), and a tested controller (204).
  6. 6. The method for coordinated control of a multi-machine parallel SVG according to any of claims 1,2, 3 or 5, wherein said validation control strategy comprises, The double closed loop design scheme of the proportional-integral controller based on the rotating coordinate system comprises the following steps: Taking the current loop as an inner loop (302); performing power unit direct current voltage regulation by using a voltage loop, wherein the voltage loop is used as an outer loop (303), and the output is used as an active current loop set (304); with the regulator as an outer loop (306), the output is given as a reactive current loop (307); And under the grid connection condition, the control strategy outputs a reactive current given generation mechanism of each SVG under grid connection control.
  7. 7. The method for coordinated control of a multi-machine parallel SVG of claim 1, wherein said executing a coordinated control strategy in a multi-machine parallel scenario comprises, Aiming at the scene that more than 2 SVGs are required to run in parallel in reactive power compensation of a wind power/photovoltaic power station, if a parallel operation control strategy is not added, reactive hedging occurs, and a master-slave parallel operation strategy and an SVG integrated controller are adopted to coordinate and control with centralized coordination of high-speed optical fiber interconnection: The master-slave parallel operation strategy comprises the following steps of enabling the parallel operation optical fiber communication speed to be 2.5G, supporting the master-slave dynamic switching, avoiding the whole system halt caused by any fault, and ensuring the consistency of the parallel operation state and the control execution continuity by the master-slave relationship on the given of the generated reactive current loop; the centralized coordination of the SVG integrated controller and the high-speed optical fiber interconnection comprises the steps of adopting one SVG integrated controller (401), adopting high-speed optical fiber connection (402) between SVGs, uploading CT signals, PT signals and working states of each SVG in parallel connection, and configuring and issuing reactive current setting by the integrated controller according to the running state, reactive power and system voltage and current signals of each equipment.
  8. 8. A coordinated control system of a multi-machine parallel SVG, which adopts the coordinated control method of the multi-machine parallel SVG according to any one of claims 1-7, and is characterized by comprising a parallel architecture selection module, a given centralized allocation module and a rapid and consistent execution module; the parallel architecture selection module is used for determining a control organization mode adopting centralized coordination of a master parallel architecture or an integrated controller according to the number of parallel architectures under a plurality of SVGs parallel access scenes to construct a high-speed optical fiber communication foundation; The centralized distribution module is used for collecting CT/PT and running state information uploaded by each SVG, the integrated controller performs unified calculation on reactive power regulation targets to form and send reactive power current giving to each SVG, and the parallel operation coordination targets are put into current closed-loop execution inlets of each SVG; The rapid consistent execution module is used for realizing information mutual transmission and response consistency by means of high-speed communication, completing current loop calculation and PWM modulation in grid-connected control, and completing voltage loop judgment calculation in a centralized manner by the integrated controller when needed so as to meet the constant voltage step response requirement, and simultaneously guaranteeing parallel operation continuous operation by an online bypass mechanism.
  9. 9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the coordinated control method of a multi-machine parallel SVG according to any one of claims 1-7.
  10. 10. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the coordinated control method of a multi-machine parallel SVG of any of claims 1-7.

Description

Coordinated control method, system, equipment and storage medium for multi-machine parallel SVG Technical Field The invention relates to the technical field of dynamic reactive power compensation of power systems, in particular to a coordinated control method, a system, equipment and a storage medium of a multi-machine parallel SVG. Background With the continuous improvement of the installation scale and grid-connected voltage level of new energy sources such as offshore wind power, centralized photovoltaic and the like, the requirements of a power system on dynamic reactive power support and electric energy quality adjustment are remarkably enhanced. The Static Var Generator (SVG) gradually becomes core voltage supporting equipment of wind power plants, photovoltaic stations and weak current network scenes due to the rapid and continuous reactive power regulation capability. In order to adapt to engineering application with higher voltage class and larger capacity, the chained cascading direct-hanging SVG realizes direct output of a high-voltage side through serial connection of power units, and voltage stability and dynamic reactive compensation can be realized in a wider working condition range by matching current closed-loop control and pulse width modulation strategy based on a rotating coordinate system. Meanwhile, the simulation modeling and the real-time semi-physical verification are gradually becoming important means for the development of control strategies and the acceptance of engineering in the complex scenes of grid-connected disturbance, high-low voltage ride through and the like. In the existing multi-machine parallel SVG engineering application, a control strategy and a verification link still have obvious short plates, namely, a multi-machine parallel system usually adopts an independent closed loop or low bandwidth coordination mode of each machine, lacks system constraint of reactive power instruction distribution and response consistency under the parallel condition, is easy to generate reactive power opposite-impact phenomenon under a constant voltage or voltage control mode, so that equivalent reactive power output of the parallel system is counteracted, a stable and predictable voltage supporting effect is difficult to form, and dynamic difference among devices can cause impact and even oscillation risks. Secondly, aiming at high-voltage cascade topologies such as chained direct-hanging SVG and the like, a control strategy usually depends on off-line simulation or single-machine test verification, and the disturbance and parallel operation coupling effect of a real network is difficult to complex under the conditions of real controller closed loop, real communication link and strict real-time constraint, so that the strategy parameter setting lacks repeatable verification basis, and the engineering landing has uncertainty. Thirdly, an interface barrier often exists between the semi-physical verification system and the communication protocol of the control system, and the support of the simulation platform to the specific high-speed communication protocol/data channel is inconsistent, so that the controller is difficult to seamlessly access real-time simulation environments such as RT-LAB and the like. Disclosure of Invention The present invention has been made in view of the above-described problems. The invention solves the technical problems that the existing multi-machine parallel Static Var Generator (SVG) coordination control method has insufficient parallel reactive hedging, reactive instruction distribution and response consistency, lacks reproducible simulation-strategy-real-time closed loop verification links for chain-type direct-hanging SVG, has insufficient reliability of parameter setting, causes that a controller is difficult to access to a real-time verification environment due to the mismatching of a semi-physical simulation platform and a control system communication protocol, and realizes reactive coordination control under a multi-machine parallel scene and ensures the dynamic consistent response and engineering feasibility through real-time semi-physical verification. The technical scheme is that the coordination control method of the multi-machine parallel SVG comprises the steps of adopting a chained SVG circuit topological graph, constructing a direct-hanging SVG simulation model, carrying out simulation analysis to formulate a control strategy, constructing a control strategy real-time verification platform verification control strategy, converting a communication conversion protocol of the SVG control system into a real-time simulation communication adaptation protocol supported by a simulation system to complete early-stage principle verification, adopting a rotating coordinate system PI double-closed-loop grid-connected control strategy, generating reactive current loop setting, executing the coordination control strategy under a multi-machine parallel sce