Three-phase UPS (Uninterruptible Power Supply) control system for restraining disequilibrium of output voltage and harmonic wave

A technology of output voltage and control system, applied in harmonic reduction device, AC network to reduce harmonic/ripple, multi-phase network asymmetry reduction, etc., can solve problems such as high hardware cost, three-phase imbalance, etc. It achieves the effects of convenient replacement, saving design cost, solving three-phase unbalance problems and harmonic compensation problems

Active Publication Date: 2012-06-27
GUANGZHOU VOCATIONAL COLLEGE OF TECH & BUSINESS +1
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the three-phase unbalance problem cannot be solved in the prior art, or even if it is solved, but the hardwa

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  • Three-phase UPS (Uninterruptible Power Supply) control system for restraining disequilibrium of output voltage and harmonic wave
  • Three-phase UPS (Uninterruptible Power Supply) control system for restraining disequilibrium of output voltage and harmonic wave
  • Three-phase UPS (Uninterruptible Power Supply) control system for restraining disequilibrium of output voltage and harmonic wave

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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] Such as figure 2 As shown, in the logical structure diagram of the embodiment of the three-phase UPS control system, the three-phase UPS control system includes a Clarke conversion unit 100, a proportional controller 200, a positive sequence controller 300, a negative sequence controller 400 and an output regulation unit 700 , wherein the Clarke transformation unit 100 converts the sampling voltage from the three-phase static coordinates to the two-phase static coordinates, and the proportional controller 200 makes a difference between the sampling voltage on the above-mentioned two-phase static coordinates and the voltage reference value to obtain an error amount, and makes a ratio control, the positive sequence controller 300 calculates part of the given ...

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Abstract

The invention discloses a control system for restraining three-phase output voltage of an uninterruptible power supply (UPS) from disequilibrium and harmonic wave. Imbalance output voltage is decomposed to be a positive-sequence component, a negative-sequence component and a zero-sequence component, which pass three groups of PI controllers; the first group of PI controllers primarily controls the output voltage by a proportional controller P under Clarke coordinate to calculate margin of error; the second group of PI controllers adjusts the positive-sequence component by an integral controller I in a positive rotary coordinate system; and the third group of PI controllers restrains the negative sequence by an integral controller in a contra-rotation coordinate system; if the negative sequence is restrained 5 times and the harmonic wave is restrained 7 times, PI control is respectively carried in a reverse 5 times based wave angular velocity rotary coordinate system and a forward 7 times based wave angular velocity rotary coordinate system. Three-phase balance output voltage can be acquired after summing up the output of the five groups of PI controllers, and carrying out the space vector modulation, thus harmonic distortion is greatly reduced.

Description

Technical field: [0001] The invention relates to a UPS power supply control system which effectively suppresses the imbalance of ground three-phase output voltage and compensates harmonics. Background technique: [0002] With the increasing demand for high-quality power supplies in important departments and large-scale electrical equipment, and in order to reduce the harmonic pollution of the power grid caused by the extensive use of power electronic equipment and the continuous increase of non-linear loads, UPS (Uninterruptible Power Supply, uninterruptible power supply) has been increasingly widely used. Its function is mainly reflected in two aspects: on the one hand, it provides uninterrupted power supply for the load when the mains power is cut off, which usually uses the battery energy storage on the UPS to invert DC into AC to supply power to the load; on the other hand, Let the UPS play the role of isolation, always provide high-quality stable voltage and frequency ...

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Application Information

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IPC IPC(8): H02J3/26H02J3/01
CPCY02E40/50Y02E40/40
Inventor 廖慧陈艳峰周创彬郑炎坤李振强
Owner GUANGZHOU VOCATIONAL COLLEGE OF TECH & BUSINESS
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