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Hysteresis control method of three-phase four-switch-type active filter

A three-phase four-switch, source filter technology, applied to harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve fault-tolerant topology three-phase four-switch APF modulation control strategy has not been studied in depth, etc. question

Inactive Publication Date: 2014-04-02
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Since the 1980s, scholars at home and abroad have done a lot of research on the conventional three-phase six-switch APF, and its modulation control algorithm has tended to be perfected, but the modulation control strategy for its fault-tolerant topology three-phase four-switch APF has not. be thoroughly researched

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  • Hysteresis control method of three-phase four-switch-type active filter

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Embodiment Construction

[0035] Image 6 It is a system diagram of connecting three-phase four-switch active filter, the system includes two parts: APF main circuit and measurement and control circuit. The APF main circuit is connected to the power grid through a series inductor, and its function is to generate the actual required compensation current to compensate the harmonic and reactive current in the power grid. The function of the measurement and control circuit is to detect the voltage and current on the grid side, the current on the load side, the APF compensation current, the capacitor voltage on the DC side, and the switching status of each contactor, complete the protection of the circuit, and generate the driving signal of the main circuit IGBT. In the APF main circuit: QF1 and QF2 are air switches; KM1, KM2, KM3 and KM4 are AC contactors; R1, R2 and R3 are buffer resistors; R4 and R5 are discharge resistors; C1 and C2 are DC bus capacitors; Connect the inductor to the AC side. The measu...

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Abstract

The invention discloses a current hysteresis control method of a three-phase four-switch-type active filter. The hysteresis control method of the three-phase four-switch-type active filter comprises the following steps: 1, firstly, three-phase reference directive current of an active filter and three-phase compensation current output actually are converted into a coordinate system with alpha-beta two-phase orthogonality by Park conversion; 2, output signals d alpha and d beta are obtained from error signals between the reference current and the actual output current after Park conversion by a hysteresis comparator; 3, a corresponding switch state table is obtained according to the topological structure of the three-phase four-switch-type active filter, and the switch action functions of two bridge arms are obtained by combining with the hysteresis comparison result and the switch state result, so that the hysteresis control of the three-phase four-switch-type active filter is realized. The hysteresis control method of the three-phase four-switch-type active filter, which is provided by the invention, is simple and reliable, is good in dynamic performance, and has favorable economic significance and market prospect.

Description

technical field [0001] The invention relates to an active filter, in particular to a hysteresis control method of a three-phase four-switch active filter. Background technique [0002] With the increasingly widespread application of power electronic devices, a large number of distributed power sources are connected to the power grid, and the power quality problem of the power system is becoming more and more serious. As a dynamic parallel compensation device, the active power filter (APF) can compensate system harmonics in real time. And reactive power, has been extensively researched and applied. Since the development of APF, many different forms of topologies have appeared, such as single type, multi-converter hybrid type, active filter and passive filter hybrid type, and the new three-phase four-switch hybrid active filter. [0003] Since the APF has been operating in harsh industrial sites for a long time, and the power switching device IGBT has been in a high-power, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 梅军郑建勇张宸宇郭邵卿周福举胡洛瑄
Owner SOUTHEAST UNIV
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