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

Inactive Publication Date: 2010-04-28
XI'AN POLYTECHNIC UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a series voltage transient compensation control circuit, which solves the prob

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

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] The structure of the series voltage transient compensation control circuit of the present invention is as follows: figure 1 As shown, it includes a rectification link 1, an inverter link 2 and a filter link 3 connected in sequence, and also includes a bypass switch 4, which is connected in series between the power grid and the load. Rectification link 1 includes diode a5, diode b6, diode c7, diode d8, capacitor a9, capacitor b10, diode a5 and diode b6 are connected to form a half bridge, diode c7 and diode d8 are connected to form a half bridge, capacitor a9 and capacitor b10 are in phase connection, the compensated phase of the three-phase AC incoming line is connected to the midpoint of capacitor a9 and capacitor b10, one of the other two phases of the three-phase AC incoming line is connected to the midpoint of diode a5 and diode b6...

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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.

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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Application Information

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IPC IPC(8): H02J3/12
Inventor 陈增禄陈佩李艳芳詹佩姚伟鹏
Owner XI'AN POLYTECHNIC UNIVERSITY
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