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Circulation control method for angle joint chain SVG (static var generator)

A circulating current control and corner connection technology, which is used in flexible AC transmission systems, AC network voltage adjustment, reactive power compensation, etc., can solve the problem that SVG devices cannot achieve reactive power and negative sequence compensation, etc. The effect of fast dynamic response speed, fast dynamic response capability

Active Publication Date: 2014-07-23
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the SVG device using the traditional circulating current control method cannot realize effective reactive power and negative sequence compensation under the condition of grid voltage asymmetry

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  • Circulation control method for angle joint chain SVG (static var generator)
  • Circulation control method for angle joint chain SVG (static var generator)
  • Circulation control method for angle joint chain SVG (static var generator)

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Embodiment Construction

[0023] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] exist figure 1 In the overall control block diagram shown, the lower left box is the sub-block diagram of the feedback controller, and the upper right box is the sub-block diagram of the feedforward controller. The input signal of the feedback controller is the grid-side three-phase current i sa i sb i sc , the output signal is the correction component i ea i eb i ec ; The input signal of the feedforward controller is the load three-phase current i ra i rb i rc with correction component i ea i eb i ec The sum, the output signal is the target value i* of the three-phase output current of delta-connected SVG ab 、i* bc 、i* ac . When the grid voltage is asymmetrical, the correction component is used to offset the influence of the negative sequence voltage and eliminate the deviation of the c...

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Abstract

Disclosed is a circulation control method for an angle joint chain SVG (static var generator). A circulation control system comprises a feed-forward controller with the susceptance balance principle and a feedback controller with a grid-side current closed loop, so that a chain SVG device can perform reactive power and negative sequence compensation for a three-phase unbalance load under the condition of asymmetric grid voltage. Grid-side current closed loop control is characterized in that residual reactive power and negative sequence components in compensated grid-side current are detected and respectively subjected to proportional integral control under a synchronous rotating reference frame, so that the residual components are gradually reduced to zero, and the influence caused by grid voltage unbalance on reactive power and negative sequence compensation effects is automatically compensated. The circulation control method combines feed-forward control with feedback control, so that the SVG device can keep fast and dynamic response, achieve fine stable compensation effects and resist the influence caused by grid voltage unbalance.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and in particular relates to a method for controlling circulation of an angle-connected chain SVG device. Background technique [0002] Chained SVG is divided into two basic topologies: delta-connected and star-connected. Studies have shown that star-connected chained SVG does not have negative sequence compensation capability, and even with a special control method, it can only perform very limited negative sequence compensation. The chain-connected SVG is usually only used in the field of reactive power compensation; while the delta-connected SVG can perform reactive power, negative sequence and harmonic compensation at the same time, but the delta-connected SVG will face special problems when performing negative sequence compensation. Circulation control issues. [0003] Due to the characteristics of the topology, when the delta-connected chain-type SVG performs negative s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/26
CPCY02E40/10Y02E40/30Y02E40/50
Inventor 王一刘建政卢浩梅红明刘树史秋娟钟启迪石山操丰梅周前程
Owner BEIJING SIFANG JIBAO AUTOMATION
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