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Current control method of PI-PCI controller acted on four-bridge-arm active power filter

A power filter and current control technology, applied in active power filtering, AC network to reduce harmonics/ripple, multi-phase network to eliminate/reduce asymmetry, etc., can solve problems such as three-phase load imbalance, and achieve Good robustness, the effect of solving the problem of unbalanced three-phase load

Active Publication Date: 2017-09-22
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Realize the accurate tracking of the compensation current, improve the power management quality of the four-arm active power filter, effectively solve the problem of unbalanced three-phase load, and quickly adapt to the impact of sudden load changes and grid frequency fluctuations

Method used

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  • Current control method of PI-PCI controller acted on four-bridge-arm active power filter
  • Current control method of PI-PCI controller acted on four-bridge-arm active power filter
  • Current control method of PI-PCI controller acted on four-bridge-arm active power filter

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Embodiment Construction

[0057] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0058] figure 1 For the algorithm flowchart of the present invention, as shown in the figure, the present invention provides PI-PCI controller to act on the current control method of four-bridge arm active power filter, comprises the following steps:

[0059] Step S1: Improve the traditional PCI controller and increase its bandwidth to enhance the robustness to grid frequency fluctuations. figure 2 The frequency characteristics of the PCI controller before and after improvement are given. The specific method is as follows:

[0060] The current signal is converted from the abc coordinate system to the αβγ coordinate system, and then the required voltage vector is obtained through PCI control. Among them, the transfer function G(s) of the traditional PCI controller

[0061]

[0062] k in formula (1) p 、k i represent the proportional...

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Abstract

The invention relates to a current control method of a PI-PCI controller acted on a four-bridge-arm active power filter, and belongs to the technical field of electric energy quality processing. The method comprises the steps of firstly, improving a traditional PCI controller, and increasing bandwidth to be adaptive to frequency fluctuation of a power grid; secondly, arranging PCI controllers with six frequencies with regard to relatively many harmonics contained in a tracking current, and connecting in parallel and integrating the six groups of PCI controllers and a PI controller to form the PI-PCI controller; and finally, setting a parameter of the PI-PCI controller according to characteristics and stability analysis of the controller. By the PI-PCI controller, the problem of three-phase load unbalance can be effectively solved, and favorable robustness can be achieved on load abrupt change and frequency fluctuation of the power grid.

Description

technical field [0001] The invention belongs to the technical field of power quality control, and relates to a current control method for a PI-PCI controller acting on a four-arm active power filter. Background technique [0002] In the three-phase four-wire low-voltage power distribution system, due to the large number of applications of nonlinear power electronic devices and unbalanced loads, the problems of harmonic pollution, reactive power shortage and three-phase current imbalance have become increasingly serious, and have become relevant Barriers to efficient use of electric energy by industry users. The four-arm active power filter is one of the effective measures to control harmonics, compensate reactive power and solve three-phase unbalance problems. It has received extensive attention and research for its strong output capability and flexible compensation capability. In order to ensure the normal operation of the four-arm active power filter, the current control ...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/26
CPCH02J3/01H02J3/26Y02E40/20Y02E40/50
Inventor 王平杨飞李刚健石轶哲倪磊江金洋谢解解
Owner CHONGQING UNIV