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Mixed voltage-sharing control method of cascaded STATCOM submodules

A voltage equalization control and sub-module technology, which is applied in AC network circuits, electrical components, flexible AC transmission systems, etc., can solve problems such as the inability to effectively achieve voltage equalization control.

Active Publication Date: 2016-06-08
XJ ELECTRIC +3
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to provide a cascaded STATCOM sub-module hybrid pressure equalization control method to solve the problem that the existing two pressure equalization methods cannot effectively achieve pressure equalization control

Method used

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  • Mixed voltage-sharing control method of cascaded STATCOM submodules
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  • Mixed voltage-sharing control method of cascaded STATCOM submodules

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] method embodiment

[0022] In this embodiment, STATCOM is a three-phase star topology, and the sub-module is an H-bridge topology, such as figure 1 shown. But, STATCOM among the present invention is not limited to these two topological structures, can be other topologies (such as single-phase) etc. that comprise cascade structure, and submodule is not limited to H bridge topology, and its submodule also can adopt H full Other topologies other than bridges (such as half-bridge, full-bridge), etc.

[0023] like figure 2 As shown, the cascaded STATCOM sub-module hybrid voltage equalization control method provided by the present invention can realize the balanced control of the sub-module voltage in the chain. The basic control strategy includes: average DC voltage closed-loop control, positive and negative sequence separation current closed-loop decou...

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Abstract

The invention relates to a mixed voltage-sharing control method of cascaded STATCOM (static synchronous compensator) submodules. When in voltage-sharing control, a PWM pulse signal of each submodule is finally generated by adopting average direct-current voltage closed-loop control, positive-negative sequence separation current closed-loop decoupling control, submodule direct-current voltage closed-loop feedback control and carrier phase-shifting high-frequency alternating control, the voltage imbalance caused by the loss difference of various submodules can be eliminated by virtue of the submodule direct-current voltage closed-loop feedback control, and the effective balanced control of the voltage of the cascaded STATCOM submodules is realized; moreover, the carrier is alternated by adopting a high-frequency alternating period, so that the alternating period is short, the control speed is high, and the voltage-sharing effect is very remarkable; and moreover, the pulse difference caused by the carrier phase shifting among various submodules can be effectively eliminated, and the voltage-sharing effect of the submodules in a chain is improved.

Description

technical field [0001] The invention relates to a hybrid voltage equalization control method of cascaded STATCOM sub-modules, which belongs to the field of STATCOM control of flexible AC transmission. Background technique [0002] Static synchronous compensator (STATCOM, Static Synchronous Compensator) has two structural forms, one is single-phase, the other is three-phase, each phase is called a chain, whether it is single-phase or three-phase, each phase (that is, each chain ) are formed by cascading several sub-modules, and the static synchronous compensator is also called cascaded STATCOM. like figure 1 As shown, it is a basic topology diagram of a three-phase cascaded STATCOM, in which the sub-module is an H-bridge circuit, but the sub-module can also be other forms of sub-modules, such as half-bridge or full-bridge sub-modules. [0003] In the cascaded STATCOM topology, when the loss characteristics and driving pulses of the sub-modules in the chain are consistent, t...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCH02J3/1857Y02E40/10
Inventor 王先为冯宇鹏吴金龙李道洋杨美娟
Owner XJ ELECTRIC
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