Cascade STATCOM-based outer loop voltage control method and device

A voltage control method and voltage control technology, applied in the field of power systems, can solve problems such as slow transient response, capacitor voltage oscillation system, instability, etc.

Active Publication Date: 2018-04-13
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0005] The present invention provides a chain-type STATCOM-based outer-loop voltage control method and device, which are used to solve the problem that the traditional voltage outer-loop control mostly uses a proportional-integral (PI) controller, and there are many integral links, so that the controller is not sensitive to the outside world. Insufficie...

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  • Cascade STATCOM-based outer loop voltage control method and device
  • Cascade STATCOM-based outer loop voltage control method and device
  • Cascade STATCOM-based outer loop voltage control method and device

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Embodiment Construction

[0054] The embodiment of the present invention provides a chained STATCOM-based outer-loop voltage control method, which is used to make the controller more sensitive to external disturbances due to the traditional voltage outer-loop control using a proportional-integral (PI) controller with many integral links. Insufficient resistance, capacitive voltage oscillation and system instability are prone to occur, especially the intra-phase voltage equalization and inter-phase voltage equalization rings, which lead to the slow transient response speed of the existing three-phase chained STATCOM system, which does not meet the actual engineering requirements technical issues.

[0055] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the prese...

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Abstract

The embodiment of the invention discloses a cascade STATCOM-based outer loop voltage control method and device. An outer loop calculation control link of double closed loop compound control for a cascade STATCOM is simplified through removing integral operation links of an interphase voltage-sharing link and an in-phase voltage-sharing link in an outer loop voltage PI control method, and technicalproblems that a proportional-integral controller (PI) controller has inadequate resistance to external disturbance, and the capacitor voltage oscillation phenomenon and system instability are easy tooccur due to the facts that the PI controller is usually adopted for traditional outer loop voltage control and relatively multiple integration links are included, especially a low transient responsespeed of an existing three-phase cascade STATCOM system is caused by the in-phase voltage-sharing link and the interphase voltage-sharing link and does not meet the actual engineering requirements are solved.

Description

technical field [0001] The invention relates to the field of power systems, in particular to an outer loop voltage control method and device based on a chained STATCOM. Background technique [0002] STATCOM, STATic synchronous COMPensator, is a kind of power equipment used in power system for reactive power compensation and comprehensive power quality management. Chained STATCOM means that the main circuit topology of STATCOM adopts single-phase full-bridge circuit (2H bridge) connected in series or in parallel. [0003] With the increasing demand for fast dynamic reactive power compensation, in the field of medium and high voltage power transmission and distribution, the chained STATCOM based on the modular series-parallel structure is characterized by high direct connection voltage, fast response speed, wide compensation range, and excellent transient characteristics. It has been widely used in fields such as wind farms, traditional direct current transmission, and compre...

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Application Information

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IPC IPC(8): H02J3/18
CPCH02J3/1821Y02E40/10
Inventor 雷二涛马明
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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