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Wattless current tracking method of static var compensator based on power balance

A technology of static var compensation and power balance, applied in the direction of reactive power adjustment/elimination/compensation, flexible AC transmission system, etc., can solve problems such as flexible selection of unfavorable compensation methods, and achieve the effect of reducing costs

Active Publication Date: 2012-06-13
HUAZHONG UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

Therefore, the traditional method limits the position of the compensation point setting, which is not conducive to the flexible selection of compensation methods

Method used

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  • Wattless current tracking method of static var compensator based on power balance
  • Wattless current tracking method of static var compensator based on power balance
  • Wattless current tracking method of static var compensator based on power balance

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Embodiment Construction

[0029] The method proposed by the present invention specifically relates to a reactive current tracking method of a static var compensator based on power balance, which can be realized by calculating the reactive power required by the load and combining the phase voltage and phase current at the STATCOM compensation point STATCOM output reactive current tracking compensation for reactive current required by the load. Since this method is based on the concept of power balance in the power system, the reactive power required by the load and the voltage at the compensation point are used to calculate the STATCOM’s required output pure reactive reference current. When the pure reactive reference current is used as the actual output current of the STATCOM When the reactive reference current is equal to the reactive power output by STATCOM, it can ensure that the reactive power output by STATCOM is equal to the reactive power required by the load, so it is called the reactive current...

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Abstract

The invention provides a wattless current tracking method of a static var compensator based on power balance, which comprises the following steps: firstly, sampling three phases of phase voltage and phase current of the low voltage side of a transformer; calculating wattless power required by a load; using the calculated wattless power as the wattless power output reference valve of STATCOM; and calculating the pure wattless reference current required to be output by STATCOM through combining the voltage of a compensating point so that the compensated wattless power is balanced with the wattless power required by the load when the actual output current equals to the pure wattless reference current. The pure wattless reference current carries out dq0 decomposition, the wattless component of the total reference current can be extracted, and the PI link output for controlling the direct current capacitance voltage of the STATCOM is used as wattful component of the total reference current, so the wattful component and the wattless component of the current can respectively carry out current PI control, and the output of the STATCOM can be controlled. In the invention, the setting of the compensating point of the STATCOM is not limited by the load current measuring point, and the compensating point can be flexibly set at each side of the transformer, so the size of the output voltage and the compensating current of the compensator can be reasonably selected.

Description

technical field [0001] The invention relates to a control method of a static var compensator, in particular to a reactive current tracking method of a static var compensator based on power balance. Background technique [0002] In the power distribution system, in order to improve the power factor of the high-voltage side of the distribution transformer and improve the power quality of the power grid, a reactive power compensation device is usually installed on the low-voltage side of the distribution transformer. Static var compensator (hereinafter referred to as STATCOM) is a widely used reactive power compensation device. During the operation of STATCOM, it is necessary to dynamically compensate the reactive power required by the load. When the reactive power required by the load changes When , it is required that the reactive power output by STATCOM can also be automatically tracked and compensated, which is realized by STATCOM's reactive current tracking method. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/16Y02E40/10
Inventor 尹项根文明浩张哲张斌熊卿刘健王存平
Owner HUAZHONG UNIV OF SCI & TECH
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