A Control Method for Parallel Operation of d-statcom System in Unbalanced State
A control method and a technology of equilibrium state, which are applied in flexible AC transmission systems, harmonic reduction devices, and AC networks to reduce harmonics/ripples. And other issues
Active Publication Date: 2021-01-01
DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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Problems solved by technology
[0004] The distribution network static synchronous compensator (D-STATCOM) has the functions of compensating reactive power, dynamically suppressing harmonics and three-phase unbalance, and has attracted much attention in the distribution network and achieved remarkable research results. Due to the D-STATCOM Harmonic amplification effect will occur when compensating the nonlinear load of voltage source type, therefore, D-STATCOM cannot compensate the nonlinear load of voltage source type well without taking additional measures, and the operation of D-STATCOM grid-connected will affect the power Relatively little research has been done on system and user impact
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0024] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0025] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...
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The invention discloses a parallel running control method of a D-STATCOM system under a balanced state. The parallel running control method comprises the steps of analyzing running and control of a D-STATCOM system, controlling active power transmission by an equivalent map, a voltage phase map and a power flow equation of the D-STATCOM system and by changing an angle Delta, and simultaneously changing voltage amplitude to control a reactive power; analyzing and selecting an appropriate current control method to control an output current of the D-STATCOM, analyzing running and control of the D-STATCOM under an unbalanced condition, performing instantaneous power analysis on a single D-STATCOM, obtaining active power output and reactive power output according to the power flow equation, andperforming corresponding control.
Description
technical field [0001] The invention belongs to the technical field of reactive power compensation for power quality control, and in particular relates to a control method for parallel operation of a D-STATCOM system in an unbalanced state. Background technique [0002] With the popularization of distributed energy systems, such as photovoltaic power generation, batteries, wind turbines and other nonlinear loads applied in distributed systems, more attention is paid to power quality. [0003] Electric energy is one of the important symbols of a country's development level and comprehensive national strength. As the pillar energy and economic lifeline of modern society, it is indispensable for our daily production and life. As an important factor in the design and operation of AC power system, reactive power is closely related to the economical operation, safety and stability of the power system. Due to the extensive use of power electronic equipment, it has caused serious p...
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IPC IPC(8): H02J3/18H02J3/24H02J3/01
CPCH02J3/01H02J3/1821H02J3/24Y02E40/10Y02E40/40
Inventor 赵金勇李晓博殷红旭
Owner DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER