Convertible static compensator provided with modular multilevel converter structure

A technology of static compensator and static synchronous compensation, applied in the direction of reactive power adjustment/elimination/compensation, flexible AC transmission system, etc., can solve problems such as limiting the application of large-capacity CSCs, achieve modular design, avoid technical difficulties, The effect of low device operation loss

Active Publication Date: 2013-03-20
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These limit the application of large capacity CSC

Method used

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  • Convertible static compensator provided with modular multilevel converter structure
  • Convertible static compensator provided with modular multilevel converter structure
  • Convertible static compensator provided with modular multilevel converter structure

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A switchable static compensator using a modular multilevel converter structure provided by this embodiment is as follows: figure 2 As shown, it includes a static synchronous compensator 1, a static synchronous series compensator 2 and a series transformer 12; the static synchronous compensator 1 includes a converter 7 and a starting circuit 5; the static synchronous series compensator 2 includes a converter 9, a series transformer 10 and changeover switch 11;

[0050] The converter 7 is composed of three-phase six bridge arms, and the six bridge arms have the same structure, and each bridge arm includes a reactor and N (N is a natural number) sub-modules with the same structure; after the sub-modules are cascaded, they pass The reactor is connected to the starting circuit 5; specifically, the midpoint of the half-bridge structure of the sub-module and the emitter of the lower tube IGBT are respectively used as the lead-out ends of the sub-module, which are sequentially...

Embodiment 2

[0062] Another switchable static compensator using a modular multilevel converter structure provided by this embodiment is as follows: image 3 As shown, this embodiment is basically the same as Embodiment 1, but the difference is:

[0063] The positions of the reactors in the inverter 7 and the inverter 9 are different. The reactor in this embodiment is connected in series on the positive and negative busbar sides of the converter 7 and the converter 9, such as image 3 shown. It is used to suppress the output harmonics of the converter device.

[0064] Specifically, the converter 7 is composed of three-phase six bridge arms, and each bridge arm includes a reactor and N submodules with the same structure; after the submodules of each bridge arm are cascaded, one end is connected to the starting circuit 5 The other end is connected in series with the reactors of the other two bridge arms to form the positive and negative busbars of the converter 7 .

[0065] The converter ...

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Abstract

The invention relates to a convertible static compensator provided with a modular multilevel converter structure. The convertible static compensator provided with the modular multilevel converter structure comprises a static synchronous compensator, a static synchronous series compensator and a series transformer (12). The static synchronous compensator comprises a converter (7) and a transformer. The static synchronous series compensator comprises a converter (9), a series transformer (10) and a change-over switch. One end of the converter (7) of the static synchronous compensator is in parallel connection with an electric transmission line I through a shunt transformer (8). The other end of the converter (7) of the static synchronous compensator is connected with one end of the converter (9) of the static synchronous series compensator. The other end of the converter (9) of the static synchronous series compensator is connected with an electric transmission line II through the change-over switch and the series transformer (10) of the static synchronous series compensator in sequence. The series transformer (12) is in series connection with the electric transmission line I. The convertible static compensator provided with the modular multilevel converter structure breaks through the technological difficulty of components in series, facilitates individual-phase control and modular design, bypasses a trouble unit through redundancy, and improves the reliability of the operation of equipment. Further, component switching frequency is low, and therefore equipment operation loss is small.

Description

technical field [0001] The invention relates to a static compensator in the field of flexible AC power transmission, in particular to a convertible static compensator adopting a modular multilevel converter structure. Background technique [0002] With the development of flexible alternating current transmission (FACTS) technology, a series of controllers with new topologies have emerged. Convertible Static Compensator (CSC) is a new FACTS control device introduced in recent years. The device combines the research results and operating experience of the existing series and parallel controllers including the unified power flow controller, and realizes different combinations of several voltage source converters by changing the connection mode of the coupling transformer to optimize the controller Structure, flexible response to system changes, is the latest generation of controllers in flexible AC power transmission and distribution systems. [0003] The switchable static co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/16Y02E40/10
Inventor 武守远王轩戴朝波王柯刘慧文包海龙
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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