Series connection type voltage transient variation compensation control circuit and control method

A compensation control, series-type technology, applied in the direction of AC network voltage adjustment, etc., can solve the problems of high cost, complicated control, large volume, etc., and achieve the effect of improving the depth of compensation
CN101699692AInactive Publication Date: 2010-04-28XI'AN POLYTECHNIC UNIVERSITY
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
XI'AN POLYTECHNIC UNIVERSITY
Publication Date
2010-04-28
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses to a series connection type voltage transient variation compensation control circuit, comprising a rectification link, an inverting link and a filtration link which are sequentially connected; the circuit further comprises a by-pass switch; the control circuit adopts carrier wave inverse cascading control method; the series connection type voltage transient variation compensation control circuit and the control method in the invention have small volume and low manufacturing cost without a power frequency injection transformer and an energy storage component; the circuit can compensate transient low voltage of symmetrical three-phase power system voltage, which is only 37 percent of rated value, or can compensate transient zero voltage of one-phase to two-phase voltage, only at least one-phase voltage is rated; when the voltage is high transiently, no matter the three-phase voltage is in any case, the compensation control circuit can compensate the three-phase load voltage to be rated; in addition, the inverting link adopts a tri-level half-bridge inverting circuit to reduce voltage stress of a switch pipe when the bus bar voltage is high, and the output voltage harmonic content is reduced, so as to bring convenience to the design of a filter.
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Description

technical field

[0001] The invention belongs to the technical field of power quality control, and relates to a voltage transient compensation control circuit, in particular to a series voltage transient compensation control circuit, and also relates to a control method using the circuit. Background technique

[0002] The series voltage transient compensation control circuit is a voltage source type power electronic compensation circuit. A compensation power supply is connected in series between the power supply and an important load. When the grid voltage changes temporarily, a compensation voltage is injected through the compensation power supply to compensate Voltage transient value, and finally keep the load voltage at the rated value. It has good dynamic performance, and when a voltage sag or swell occurs, it can restore the voltage at the fault to the normal value in a very short time (several milliseconds). At present, for the voltage transient problem, the common com...

Claims

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