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Capacitor voltage fluctuation restraining method for delta connection chained static var generator

A static reactive power and fluctuation suppression technology, applied in reactive power compensation, AC network voltage adjustment, reactive power adjustment/elimination/compensation, etc., can solve the problems of increasing the cost and volume of the converter, and improve the modulation ratio range. , the effect of reducing capacitance, cost and volume

Inactive Publication Date: 2015-01-21
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

However, an excessively large DC capacitance will increase the cost and volume of the converter

Method used

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  • Capacitor voltage fluctuation restraining method for delta connection chained static var generator
  • Capacitor voltage fluctuation restraining method for delta connection chained static var generator
  • Capacitor voltage fluctuation restraining method for delta connection chained static var generator

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Embodiment Construction

[0018] The capacitive voltage fluctuation suppression method of the delta-connected chain-type static var generator proposed by the present invention comprises the following steps:

[0019] (1) Acquire the synchronous angular frequency ω of the three-phase line voltage of the power grid connected to the delta-connected chain static var generator 1 and synchronous phase angle θ;

[0020] (2) The output reactive current effective value I of the set static var generator q , according to the effective value of the output reactive current I q And the synchronous angular frequency ω of the above-mentioned three-phase line voltage of the power grid 1 and the synchronous phase angle θ, calculated by the following formula to obtain the three-phase fundamental wave current reference value i ra1 i rb1 and i rc1 Variation over time t: i rb 1 = 2 I q ...

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Abstract

The invention relates to a capacitor voltage fluctuation restraining method for a delta connection chained static var generator and belongs to the technical field of voltage source current converters and the technical field of dynamic reactive power compensation. According to the method, a third harmonic generation ring current is injected in a three-phase bridge arm current, so that after the third harmonic generation ring current is coupled to a direct current capacitor, the voltage fluctuation of the direct current capacitor is counteracted, and the fluctuation peak value of the capacitor voltage is reduced. The fluctuation peak value of the capacitor voltage and the current of the capacitor can be reduced by the ring current injected in the three-phase bridge arm current and the maximum modulation ratio range can be enlarged as well. Due to the fact that the cost and the size of the direct current capacitor of a chained current converter account for a large ratio overall, the required capacitor capacity can be reduced by reducing the fluctuation peak value of the chained capacitor voltage, and the method has great value in the aspects of cost and size reduction of the static var generator.

Description

technical field [0001] The invention relates to a capacitor voltage fluctuation suppression method for a delta-connected chain-type static var generator, and belongs to the technical fields of voltage source converters and dynamic var compensation. Background technique [0002] The static var generator (STATCOM) based on the voltage source converter can output dynamic reactive current with a fast response speed, improve the dynamic reactive power support capability of the system, and thus improve the system voltage stability. On the user side, STATCOM can also be used to improve power factor or compensate asymmetrical loads, thereby improving power quality. The chain-link converter is a multi-level converter topology that is cascaded through full-bridge units. It has the characteristics of easy realization of a large number of levels, so that it is easy to achieve high voltage and large capacity. The chain-link converter also has the characteristics of good harmonic charact...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCY02E40/30H02J3/16
Inventor 魏伟宋强许树楷冯满盈黎小林刘文华
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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