Static reactive power compensation control method based on sequence component method

A static var and power compensation technology, which is applied in the direction of reactive power adjustment/elimination/compensation, reactive power compensation, etc., can solve the problems of poor control performance and reduce the reliability of static var compensation devices in distribution networks, etc., to achieve Good compensation effect and scientific method

Inactive Publication Date: 2012-09-19
NORTHEAST DIANLI UNIVERSITY +2
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Problems solved by technology

The voltage controller designed under the condition of three-phase voltage balance, when the grid voltage is unbalanced, its control performance will deteriorate, which reduces the reliability of the distribution network static var compensation device

Method used

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  • Static reactive power compensation control method based on sequence component method
  • Static reactive power compensation control method based on sequence component method
  • Static reactive power compensation control method based on sequence component method

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, the static reactive power compensation control method based on the sequence component method of the present invention connects the static reactive power compensation device based on the VSI-SVPWM structure to the power grid through a reactor after LC filtering, and is used for reactive power compensation . The main circuit of the static var compensator is composed of a three-phase voltage type inverter. The power switching device uses an insulated gate bipolar transistor IGBT, which is the driving IGBT module; the DC side energy storage element uses an electrolytic capacitor C to provide DC for the inverter. voltage support. The LC filter is used in the output circuit of the static var compensator, in order to filter out the high-frequency burr caused by the power switching device.

[0025] Such as figure 2 As shown, in the stat...

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Abstract

The invention relates to a static reactive power compensation control method based on a sequence component method. The static reactive power compensation control method is characterized by comprising the following steps of: converting a, b and c three-phase current to sequence current; performing positive-sequence voltage space vector conversion, negative-sequence voltage space vector conversion and positive-negative-sequence space vector synthesis on the current to obtain positive-sequence and negative-sequence compensating current through a symmetrical component method according to the three-phase current to be compensated; transferring positive-sequence voltage and negative-sequence voltage to be under an (alpha, beta) coordinate system; laminating the values of positive-sequence components and negative-sequence components under the (alpha, beta) coordinate system; performing SVPWM (Space Vector Pulse Width Modulation) control through a DSP (Digital Signal Processor) to generate a series of PWM (Pulse-Width Modulation) signals; and driving an IGBT (Insulated Gate Bipolar Translator) module through a driving circuit to generate the necessary compensation current so as to realize asymmetric static reactive power compensation. The static reactive power compensation control method has the advantages of being scientific, reasonable and applicative, being capable of performing reactive power compensation on a static reactive power compensator of a distribution system, having a good compensation effect, and the like.

Description

technical field [0001] The invention relates to the field of reactive power compensation of power distribution systems, and relates to a static reactive power compensation control method based on a sequence component method. Background technique [0002] The reactive power balance of the power distribution system has important significance for voltage and line loss. Excessive or insufficient reactive power will cause the voltage of the power system to increase or decrease, and the voltage quality will deteriorate. The reactive power compensation and reactive power balance of the power system are the key to ensure the voltage quality. basic conditions. [0003] The reactive power supply in the power system mainly includes: synchronous generators, synchronous condensers, synchronous motors, shunt capacitors, ground capacitance of high-voltage overhead lines and cable lines, and static dynamic reactive power compensation devices. The dynamic reactive power reserve capacity in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 辛业春李国庆全凤岐王振浩王芝茗李卫国李春东王玲
Owner NORTHEAST DIANLI UNIVERSITY
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