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Low-operand three-level four-bridge-arm active power filter FCS-MPC control method

A technology of power filter and control method, which is applied in the direction of active power filter, electrical components, circuit devices, etc., can solve the problems of large and low calculation amount, reduce the calculation amount of prediction, and take into account the optimal tracking performance of current Effect

Inactive Publication Date: 2021-12-10
XUZHOU NORMAL UNIVERSITY +1
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  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: In order to solve the problem of large amount of calculation in the FCS-MPC control of the three-level four-arm APF, realize the three-level four-arm APF that takes into account the equivalent principle of redundant vector current following performance and the principle of voltage jump limitation Low Computational Load FCS-MPC Control

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  • Low-operand three-level four-bridge-arm active power filter FCS-MPC control method

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[0044] Below in conjunction with the accompanying drawings, the present invention will be further described with the three-phase four-wire low-voltage power supply system of the three-level four-arm active power filter. The specific implementation steps of the invention are as follows:

[0045] 1) to t k APF output current at time [i α (t k ),i β (t k ),i γ (t k )], harmonic reference current and grid voltage [e α (t k ),e β (t k ),e γ (t k )] for sampling, the subscripts α, β, γ refer to the three-phase stationary coordinate system, i α (t k ),i β (t k ),i γ (t k ) for t k The actual value of the active power filter output current in the αβγ coordinate system at any time, for t k The actual value of the harmonic reference current in the αβγ coordinate system at each moment, e α (t k ),e β (t k ),e γ (t k ) for t k The actual value of the grid voltage in the αβγ coordinate system at any moment; the optimal switching vector S(t k )=(S A (t k ), S...

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Abstract

The invention provides a low-operand three-level four-bridge-arm active power filter FCS-MPC control method. In order to reduce the prediction operand of a three-level four-bridge-arm active power filter FCS-MPC control system and give consideration to voltage jump limitation and current following control performance, an equivalent reference voltage is obtained by performing equivalent conversion on a harmonic reference current, according to a reference voltage gamma coordinate axis component reference value, a switching sequence set corresponding to an alternative voltage vector is obtained for the first time according to a spatial layering thought, and the switching sequence set corresponding to the alternative voltage vector is screened for the second time in combination with a redundant vector current following performance equivalence principle and a voltage jump limiting principle; and the optimal voltage vector is selected through a cost function on the basis of the principle of optimal voltage following performance, that is, current following optimal control is achieved, a corresponding switching vector is output and acts on the active power filter in the next control period, the prediction operand is greatly reduced, and the operand can be reduced from 81 times to 4-18 times.

Description

technical field [0001] The invention relates to the technical field of three-level four-arm active power filter control, in particular to a three-level four-arm active power filter FCS-MPC control method with low calculation amount. Background technique [0002] With the rapid development of science and technology, power electronic equipment and nonlinear loads are widely used in power systems, and the problem of harmonic pollution is becoming more and more serious. Harmonic control and three-phase current imbalance are two common problems in the three-phase four-wire system of the low-voltage distribution network. The three-level four-leg active power filter (Active Power Filters, APF) is a comprehensive An important measure to solve the above two power quality problems. Finite Control Set Model Predictive Control (FCS-MPC) technology has the advantages of intuitive modeling, simple control, multi-objective optimal control, and no PWM modulator and PI parameter adjustment....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCH02J3/1842Y02E40/20
Inventor 郭金星王贵峰武泽文高煦杰吴玮李沛儒祝莘莘马一鸣王生壮黄英豪曹传攻
Owner XUZHOU NORMAL UNIVERSITY