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Alternate charging starting circuit and control method for chained static synchronous compensator

A static synchronous compensation, alternate charging technology, applied in flexible AC transmission systems, reactive power adjustment/elimination/compensation and other directions, can solve the problem of large bypass switch capacity, and achieve small charging switch capacity, easy manufacturing, and low impact. Effect

Active Publication Date: 2014-02-12
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantage is that the required bypass switch capacity is very large

Method used

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  • Alternate charging starting circuit and control method for chained static synchronous compensator
  • Alternate charging starting circuit and control method for chained static synchronous compensator
  • Alternate charging starting circuit and control method for chained static synchronous compensator

Examples

Experimental program
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Effect test

Embodiment 1

[0039]The alternate charging in this embodiment refers to a start-up mode in which the DC capacitors of each link module of the chain-type static synchronous compensator are charged in turn by using a low-voltage power supply in accordance with a predetermined sequence during the start-up process of the chain-type static synchronous compensator. The order in this embodiment can be defined artificially (for example, odd numbers first and then even numbers or from the last group of chain link modules to the first group of chain link modules, etc.), this embodiment only uses N chain link modules from top to bottom Instructions for the order of 1-N. Specifically, the chain-type static synchronous compensator includes N chain-link modules with the same structure in series; the N series-connected chain-link modules are connected in series with the connected inductance and then connected in parallel with the grid through a grid-connected switch; the chain-link modules It includes a p...

Embodiment 2

[0052] This embodiment is basically the same as Embodiment 1, but the difference lies in:

[0053] The alternate charging starting circuit in this implementation does not include a transformer, that is, the current limiting resistor and the charging switch connected in series are directly connected to the AC power supply. In this way, according to the voltage required by the DC side capacitor of the chain link module, the amplitude of the auxiliary power supply (when it is an AC power supply) is calculated, and the AC power supply is selected.

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Abstract

The invention discloses an alternate charging starting circuit and a control method for a chained static synchronous compensator. The alternate charging starting circuit is connected between an alternating current power grid and the chained static synchronous compensator in parallel; the alternate charging starting circuit comprises an auxiliary power supply, a current-limiting resistor, a charging switch and a transformer; a primary side of the transformer is connected with the auxiliary power supply; one end of a secondary side of the transformer is connected with the current-limiting resistor and the charging switch which are connected in series, and the other end of the secondary side of the transformer is connected with one end of the power grid; and the charging switch is connected with the other end of the power grid. By controlling the charging switch and an IGBT (insulated gate bipolar transistor) module of the static synchronous compensator, the static synchronous compensator is charged at a direct current side firstly and then is connected to the power grid after charging. In the invention, the direct current side of the static synchronous compensator is charged and then the static synchronous compensator is connected to the power grid, thus an impact current is small. The alternate charging starting circuit disclosed by the invention is simple and is easy to realize. The transformer added into the alternate charging starting circuit disclosed by the invention can realize good isolation effect, and alternating current power supplies with different amplitudes can be configured.

Description

Technical field: [0001] The invention relates to the field of power electronics, in particular to an alternate charging starting circuit and control method for a chain-type static synchronous compensator. Background technique: [0002] STATCOM-Static Synchronous Compensator (Static Synchronous Compensator), is a new type of static var dynamic compensation device, which is composed of voltage source converters connected in parallel to the system, and its output capacitive or inductive reactive current is continuous and adjustable And independent of the voltage at the point of connection to the system. It uses a voltage source converter (VSC) as the core, uses a DC capacitor as an energy storage element on the DC side, uses a turn-off device to convert the DC side voltage into an AC voltage with the same frequency as the power grid, and connects the reactor in parallel. On the power grid, properly adjusting the amplitude and phase of the output voltage on the AC side, or dire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/16Y02E40/10
Inventor 王轩王柯王清涛郑青青赵瑞斌王学军何维国华斌
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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