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Non-liner switching control method of single-phase shunt active power filter

A technology of power filter and control method, applied in active power filter, harmonic reduction device, AC network to reduce harmonic/ripple and other directions, can solve problems such as large compensation error, achieve short operation period and control strategy Simple and effective effects

Inactive Publication Date: 2010-12-01
UNIV OF JINAN +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a non-linear switching control method for a single-phase parallel active power filter, which has the advantages of simplicity and accuracy, in order to solve the problems of large compensation errors caused by the traditional APF control method

Method used

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  • Non-liner switching control method of single-phase shunt active power filter
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  • Non-liner switching control method of single-phase shunt active power filter

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] The topology of a single-phase APF is as follows figure 1 shown. U in the picture s and i s are the supply voltage and current, respectively, i L is the nonlinear load current, i c is the compensation current of the APF. L is the APF AC side inductance, r is the APF AC side resistance, C is the APF DC side capacitance, U dc is the DC side voltage. S 1 ~S 4 Represents 4 power modules. According to Kirchhoff's law, the single-phase APF voltage-current equation can be established:

[0023] L di c dt + i c r + s U dc = U s (2)

[0024] C dU dc dt = ...

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Abstract

The invention relates to a non-liner switching control method of a single-phase shunt active power filter, comprising the following steps: 1) building an error model of a switching system; 2) calculating the liapunov function V=xTPX of each subsystem by the linear system theory, and judging: (1) judging whether each subsystem moves in the area, if yes, proving that the subsystem is convergent and the state variable of the system approaches to zero, and switching the switching system to a corresponding subsystem, wherein in the control input of the system, arg means that a subscript satisfying the expression is taken; (2) if two subsystems both move in the area, proving that two subsystems are convergent and can cause the state variable of the system to approach to zero, calculating the subsystem which causes the switching system to be switched to a control input decision, and ensuring the highest APF convergence rate; and 3) under the action of control input u(t), carrying out precise compensation on harmonic current in a power grid by the APF.

Description

technical field [0001] The invention relates to a nonlinear switching control method of a single-phase parallel active power filter. Background technique [0002] Nowadays, nonlinear loads are widely used in power devices and industrial equipment, and their unique working characteristics lead to a large number of harmonics in the power grid, which seriously pollutes the power quality. The active power filter can dynamically compensate the unknown harmonic current in the power grid, and at the same time, it can overcome many shortcomings such as the resonance of the passive filter and can only compensate for fixed-order harmonics, and can effectively suppress the harmonics of the power grid. [0003] The study of active power filter control strategies has been an important topic. The control methods of the traditional active power filter APF (Active Power Filter, APF) all start from the AC side of the APF and consider its ideal equivalent model. This consideration is conduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 张永峰程新功宗西举陈爱宾渠志江赵全新秦建华孙岳
Owner UNIV OF JINAN
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