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Improved space vector single period control method and device for active power filter

A power filter, single-cycle control technology, applied in active power filter, harmonic reduction device, output power conversion device, etc., can solve the problem of complex control system design

Inactive Publication Date: 2014-04-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional active power filter needs to detect the harmonic current first, and then apply hysteresis current control, triangular wave current control and other control methods to output the same compensation current, so the design of the entire control system is more complicated

Method used

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  • Improved space vector single period control method and device for active power filter
  • Improved space vector single period control method and device for active power filter
  • Improved space vector single period control method and device for active power filter

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Embodiment Construction

[0027] (1) The main circuit equation of the active power filter is established:

[0028] figure 1 , let the three-phase phase voltages at the output terminals of the converter be v ca , v cb , v cc , for a three-phase symmetrical system, the mathematical equation describing the main circuit of the converter can be expressed as

[0029] v ca v cb v cc = L di ca dt di cb dt ...

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Abstract

The invention belongs to the field of active power filters, and provides an improved space vector single period control method used for simplifying an integral control system. In order to achieve the purpose, the method comprises the following steps: an active power filter main circuit equation based on a single period control idea is simplified; a three-phase power supply voltage zone regionalization condition judgment table is used for judge that a voltage vector of a three-phase AC is located in a zone I, II or III; on-off state da, db or dc of bridge arms on a corresponding phase can be obtained via a judgment result, and an active power filter single period control equation in the zone I, II and III is obtained; Vm is regulated and controlled through that deviation delta vd of the voltage on the active power filter DC side is regulated by proportional integral (PI), and voltage Vd of the DC side is required to be kept during the regulation process, thus a required active power under the current load condition is obtained. The invention is mainly applied in active power wave filtering.

Description

technical field [0001] The invention belongs to the field of active power filters, and in particular relates to an improved space vector single-cycle control method and device for active power filters. Background technique [0002] In the harmonic suppression method, the active power filter has obvious advantages over the passive power filter, such as compensating each harmonic at the same time, real-time compensation for changing reactive power, etc. Become the main means of eliminating harmonics. However, the traditional active power filter needs to detect the harmonic current first, and then apply hysteresis current control, triangular wave current control and other control methods to output the same compensation current, so the design of the entire control system is relatively complicated. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, further improve on the basis of traditional single-cycle control, and provide an improved ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02M7/5387
CPCY02E40/22Y02E40/40Y02E40/20
Inventor 王继东杨官庆
Owner TIANJIN UNIV