Analysis method for DVR compensation policy

A technology of analysis method and strategy, applied in AC network circuits, instruments, regulating electrical variables, etc., can solve problems such as unclear physical concepts and difficulty in analyzing voltage sag (swell) situations

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

[0006] The purpose of the present invention is to propose a new method for DVR compensation strategy analysis, to solve the problem that the physical concept of traditional DVR compensation strategy analysis method is not clear, and it is difficult to analyze the complex voltage sag (swell) situation

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  • Analysis method for DVR compensation policy
  • Analysis method for DVR compensation policy
  • Analysis method for DVR compensation policy

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Embodiment Construction

[0024] 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.

[0025] figure 2 It is a schematic diagram of the DVR principle. figure 2 , the dynamic voltage compensator DVR is connected in series with the system power supply U S and load, the load voltage U LOAD is the system voltage U S and the sum of DVR compensation voltage. 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 ...

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Abstract

The invention discloses an analysis method for a DVR compensatory strategy in the technical field of control of the electric power system. The analysis method adopts the technical scheme that the system voltage phasor after temporary reduction or rise is arranged into a transverse axle, and the circle center of a compensatory limit circle taking the DVR limit offset voltage as the radius is arranged at the end point of the system voltage phasor; the probable value of the load voltage after the DVR compensation is intuitively obtained through the positions of the compensatory limit circle and the load rated voltage amplitude value trail, and whether the load voltage can be restored to the level before the temporary reduction or rise is judged; and finally, the amplitude value and the phase of the DVR offset voltage are determined according to the compensatory strategy set in advance. Compared with the traditional method, the invention has the advantages that the invention has clear physical concept and simple and convenient calculation and is more favorable for the analysis and the determination of the DVR compensatory strategy.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to an analysis method of a DVR compensation strategy. Background technique [0002] Among various power quality problems in the power system, voltage sag (swell) is the power quality problem with the highest probability of occurrence. Voltage sags (swells) will cause a large number of sensitive devices in the system to malfunction and cause incalculable losses. Therefore, compensation for voltage sags (swells) is particularly important. 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, the DVR can act quickly within ms, effectively compens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G05F1/10
Inventor 孙哲肖湘宁刘颖英郭春林徐永海
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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