Cascaded SVG system based on double-BUCK module and reactive power compensation control method

A cascading and sub-module technology, applied in the direction of reactive power adjustment/elimination/compensation, flexible AC transmission system, AC network circuit, etc., can solve the problem of unfavorable power density increase and DC fault suppression, relatively high requirements for capacitor storage size, The problem of weak DC side fault suppression ability can be solved to solve DC fault suppression, improve power density, and reduce capacitor size.

Inactive Publication Date: 2019-04-05
HEFEI KEWELL POWER SYST CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

However, the traditional cascaded SVG will cause the DC side voltage to be unstable while performing reactive power compensation. The power sub-modules used are generally full-bridge converters, which have relatively high requirements for the storage capacity of the sub-module capacitors, and the DC side faults Inhibition is relatively weak
[0003] At present, the DC side voltage control for cascaded SVG has great limitations in software and hardware improvement methods, which is not conducive to power density improvement and DC fault suppression

Method used

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  • Cascaded SVG system based on double-BUCK module and reactive power compensation control method
  • Cascaded SVG system based on double-BUCK module and reactive power compensation control method
  • Cascaded SVG system based on double-BUCK module and reactive power compensation control method

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Embodiment Construction

[0025] The solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] figure 1 Shown is the topology diagram of the cascaded SVG system based on double BUCK sub-modules.

[0027] The cascaded SVG system based on double BUCK modules includes a three-phase chained SVG circuit and three inductors L, and one end of the three-phase link of the three-phase chained SVG circuit is respectively connected to the AC power grid through an inductor L A, B, C three-phase, the other end of the three-phase link adopts star connection. The inductance L is used to suppress the output harmonics of the device and provide reactive power to the grid.

[0028] Each phase link of the three-phase link includes at least one double BUCK sub-module connected in series, refer to figure 2 , the double BUCK submodule includes:

[0029] The reverse series switch tube T 1 and diode D 1 , reverse series switching tu...

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Abstract

The invention discloses a cascaded SVG system based on a double-BUCK module and a reactive power compensation control method so as to solve the problem that a control system is too complicated when aDC side voltage is stabilized and to improve the power density of a device. The system comprises a three-phase chain type SVG circuit and an inductor, one end of each of three phase links is connectedto a phase of A, B and C phases, the other end of each of the three phase links adopts a star connection manner, and each phase link of the three phase links comprises at least one double-BUCK sub-module connected in series. The double-BUCK sub-modules of the invention can control the system to cut off the communication with a DC side, a similar two-level control method can reduce a required sub-module capacitance, the power density is increased, and therefore, the problems of power density increase and DC failure suppression are solved.

Description

Technical field: [0001] The invention belongs to the technical field of application of high-voltage and high-power power electronic technology in power systems, and relates to a topology structure and a control method of a cascaded SVG. Background technique: [0002] Cascaded SVG has been widely used in the field of reactive power compensation in medium and high voltage distribution networks. It has the characteristics of modularization, can easily increase the connection voltage level, and can be directly integrated into the medium and high voltage power grid without a transformer, reducing costs. However, the traditional cascaded SVG will cause the DC side voltage to be unstable while performing reactive power compensation. The power sub-modules used are generally full-bridge converters, which have relatively high requirements for the storage capacity of the sub-module capacitors, and the DC side faults The ability to suppress is relatively weak. [0003] At present, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCH02J3/1821Y02E40/10
Inventor 彭凯
Owner HEFEI KEWELL POWER SYST CO LTD
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