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Self-adaptive interphase voltage balance control method for direct-current side of star-connected STATCOM device

A phase-to-phase voltage and balanced control technology, applied in the direction of circuit devices, AC network circuits, flexible AC transmission systems, etc., can solve problems such as device collapse, high capacitor voltage, affecting device safety and stable operation, etc., to ensure safe and stable operation, Guarantee the performance of reactive power compensation and avoid the effect of continuous increase of unbalance

Pending Publication Date: 2020-02-18
SHANGHAI JIAO TONG UNIV +1
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  • Claims
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AI Technical Summary

Problems solved by technology

When the capacitor voltage imbalance on the DC side continues to increase, it will cause the capacitor voltage of some chain links to be higher than that of other chain links. In severe cases, the chain link may be forced out of operation, which will affect the safe and stable operation of the device. , and even cause the device to crash

Method used

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  • Self-adaptive interphase voltage balance control method for direct-current side of star-connected STATCOM device
  • Self-adaptive interphase voltage balance control method for direct-current side of star-connected STATCOM device
  • Self-adaptive interphase voltage balance control method for direct-current side of star-connected STATCOM device

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Embodiment Construction

[0022] The technical solution among the present invention will be described in detail below in conjunction with accompanying drawing and embodiment, and present embodiment is carried out under the premise of technical solution of the present invention, has provided detailed implementation mode and concrete operation process, but the application of the present invention The scope is not limited to the examples described below.

[0023] see figure 1 , figure 2 , image 3 , figure 1 It is a star-connected cascaded STATCOM main circuit structure diagram, figure 2 is the block diagram of reactive power compensation control under the unbalanced condition of the system, image 3 It is a block diagram of zero-sequence voltage injection DC side voltage equalization control under the unbalanced condition of the system.

[0024] It can be seen from the figure that the DC side adaptive phase-to-phase voltage equalization control method of the star-connected STATCOM device of the pr...

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Abstract

The invention relates to a self-adaptive interphase voltage balance control method for a direct-current side of a star-connected STATCOM device, which determines zero-sequence voltage injection control by detecting and judging the voltage unbalance degree of a three-phase direct current side of a chain-type STATCOM. Continuous increase of the unbalance degree of the capacitor voltage on the direct-current side can be avoided, the situation that the capacitor voltage of some chain links is higher than that of other chain links to force the chain links to quit operation is prevented, and safe and stable operation is ensured. And the three-phase direct-current side voltage can be balanced when reactive compensation is carried out on the three-phase direct-current side voltage under an unbalanced load working condition in grid-connected operation.

Description

technical field [0001] The invention relates to a high-voltage chain-type static synchronous compensator (hereinafter referred to as STATCOM), in particular to a DC side self-adaptive phase-to-phase voltage equalization control method of a star-connected STATCOM device. Background technique [0002] The transmission of reactive power in the power grid has a great impact on the operation of the power system. There are a large number of inductive reactive loads in the power grid. At the same time, the nonlinear, asymmetrical and impulsive reactive loads in the power system increase, which will seriously affect the power quality. It leads to problems such as voltage fluctuations, high harmonic content, and power shocks. Therefore, large-capacity, fast-response, effective and reliable reactive power compensation is crucial to the operation of the power system, which can improve the stability of the power system and improve power quality. [0003] Among them, each phase of the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/26
CPCH02J3/1821H02J3/26Y02E40/10Y02E40/50
Inventor 舒德兀欧阳自强朱琼锋张金平
Owner SHANGHAI JIAO TONG UNIV
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