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Minimum zero-sequence component compensation control method for three-phase bridge type DVR

A technology of zero-sequence component and compensation control, applied in the direction of AC network voltage adjustment, etc., can solve problems such as zero-sequence compensation of three-phase power systems, and achieve the effect of clear thinking, simple calculation, and clear physical concept

Inactive Publication Date: 2009-07-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0005] The purpose of the present invention is to propose a minimum zero-sequence component compensation control method for a three-phase bridge DVR, by using The zero-sequence component of the DVR output reference voltage is as small as possible to realize the compensation for the three-phase power system containing the zero-sequence component

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  • Minimum zero-sequence component compensation control method for three-phase bridge type DVR
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  • Minimum zero-sequence component compensation control method for three-phase bridge type DVR

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[0023] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0024] figure 1 It is a schematic diagram of the DVR principle. The dynamic voltage restorer DVR is connected in series between the system power supply and the load, and the load voltage U LOAD is the system voltage U S and DVR compensation voltage U DVR Sum. During normal operation, the power supply voltage is within the allowable range, the DVR output compensation voltage is 0, and the load voltage U LOAD equal to the system voltage U S . When the system supply voltage U S When a sag (swell) occurs, the DVR outputs a compensation voltage U DVR , so that the load voltage U LOAD Operate within the allowable range. Due to the limited capacity of the DVR device, its output voltage has a limit, which is called ...

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Abstract

The invention discloses a minimal zero-sequence component compensation control method for a three-phase bridge-type DVR in the technical field of control of the power system. The method adopts the technical scheme that the each-phase voltage phasor and the zero-sequence component of the output voltage of the DVR are determined; the load reference voltage locus circle and the each-phase limit offset voltage locus circle are established; the each-phase compensated load voltage locus phase range and the zero-sequence output voltage during the same-phase compensation are determined; and the minimum state of the zero-sequence component is searched from the same-phase compensating position through minute angular deflection, and the corresponding DVR each-phase output offset voltage is calculated, so that the minimum zero-sequence compensating control in the three-phase system including the zero-sequence component is realized. The invention has the characteristics of definite physical concept, clear thought and simple and convenient calculation and is suitable for the minimum zero-sequence compensating control of the bridge-type structure DVR.

Description

technical field [0001] The invention belongs to the technical field of electric power system control, and in particular relates to a minimum zero-sequence component compensation control method of a three-phase bridge DVR. Background technique [0002] DVR (Dynamic Voltage Restorer, Dynamic Voltage Restorer) is a DFATS (Distribution Flexible Alternative Current Transmission Systems, flexible power distribution technology) device that has appeared in recent years. It is connected in series between the power supply and the sensitive load. When the system voltage is normal, the DVR is bypass. When the system voltage sags (swells), the DVR can act quickly within ms to effectively compensate the sag voltage and protect sensitive loads from the influence of voltage sags. Because among various power quality problems in the power system, voltage sag (swell) is the power quality problem with the highest probability of occurrence, which often causes a large number of sensitive equipme...

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Application Information

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IPC IPC(8): H02J3/12
Inventor 郭春林徐永海肖湘宁刘颖英孙哲韩冰张应瑜
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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