Three-phase four-wire APF (active power filter) control method based on combination of one-cycle control and SVPWM (space vector pulse width modulation)

Abstract

The invention belongs to the technical field of distributed power supply and micro-grids and discloses a three-phase four-wire APF (active power filter) control method based on combination of one-cycle control and SVPWM (space vector pulse width modulation). The method comprises steps as follows: a sector where a voltage vector is located is judged, and corresponding two-bridge-arm switches and two-phase current are selected according to signals generated in the sector where the voltage vector is located; direct-current capacitor voltage Vc and reference voltage Vref are subjected to subtracted operation, an obtained result is regulated by PI, phase voltage Vp is obtained, the obtained Vp is integrated and then compared with voltage drop of the selected current on a sampling resistor, a control equation is obtained, and on-off of a switch on a three-phase current bridge arm is controlled; on-off of a switch on a zero-line bridge arm is required to guarantee that an APF works in a three-phase four-wire state; zero-line current independently is subjected to current compensation through one-cycle control. According to the method, a harmonic detection circuit can be omitted, and on-offtimes of the switches and switch loss are reduced.

Description

technical field [0001] The invention belongs to the technical field of distributed power supply and micro-grid, and in particular relates to a three-phase four-wire APF control method combining single-cycle control and SVPWM. Background technique [0002] In order to solve the problems of energy shortage and environmental pollution, human beings have accelerated the pace of research on distributed power sources and microgrids. The biggest feature of distributed power is renewable, pollution-free and flexible. In recent years, the microgrid as an effective carrier of distributed power has attracted more and more attention from all over the world. It is generally difficult for large power grids to reach remote and difficult areas such as our army's Tibet, Xinjiang border posts, and independent islands and reefs in the South China Sea. In these areas with better solar and wind energy resources, small independent micro-grids can be built to solve the problem of power supply gua...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: if the three-phase four-arm APF control method adopts SVPWM control, there are many interval judgment conditions and the control structure is complicated; if single-cycle control is adopted, the switching action is frequent and the switching loss is large

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