Testing device for operation of current changing chain and control method

A test device and operation test technology, which is applied in the field of power electronics, can solve the problems of many device components, large operating noise, and many maintenance tasks, and achieve low system capacity requirements, reduce power waste, and achieve simple effects
CN102565579AActive Publication Date: 2012-07-11CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
Publication Date
2012-07-11

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Abstract

The invention discloses a testing device for operation of a current changing chain and a control method. The testing device comprises two current changing chains, wherein one end of each current changing chain is connected with a reactor in series; and a single-phase system transmits current to the current changing chain by a soft circuit and the reactor so as to charge the two current changing chains. Inverse outputs of the two current changing chains are started simultaneously, and the output currents are increased gradually and respectively, so that one current changing chain works in a capacitive output state, and the other current changing chain works in a sensible output state till the two current changing chains meet the testing conditions. By test, whether the current chaining chains can operate normally to meet the designed capacity and overload capability under various working conditions can be judged. The invention has the advantages that the circuit is simple, and all parts of a cascade converter can be completely utilized without need of adding a special testing part additionally; long-time and high-power test can not cause influence on the system, and the power waste is reduced; and the requirement on the system capacity is very low without need of capacity expansion and modification on a power supply.
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Description

Technical field:

[0001] The invention relates to the field of power electronics, in particular to a commutation chain operation test device and a control method. Background technique:

[0002] The cascaded converter (namely, the converter chain) is composed of N independent full-bridge structure link modules or half-bridge structure link modules connected in series on the AC side. Each link module (also called a converter unit ) DC sides are independent of each other. After three single-phase commutation chains are connected in series with inductors, a three-phase system can be formed through Y-type or β–³-type connections. It can be used in various high-voltage power electronic devices. The capacitive or inductive reactive current output by the converter is within the allowable system It is continuously adjustable within the voltage range and has nothing to do with the system voltage. When the DC side of each chain link module is connected with a power supply or energy stora...

Claims

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