Saturated switching control method for three-phase parallel active power filter

A technology of power filter and control method, which is applied in the direction of active power filter, harmonic reduction device, AC network to reduce harmonic/ripple, etc., and can solve problems such as low precision and system stability influence

Inactive Publication Date: 2013-08-14
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems such as the low precision of the traditional control method of the existing active power filter and the influence of the saturation nonlinear stability on the system stability.

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  • Saturated switching control method for three-phase parallel active power filter
  • Saturated switching control method for three-phase parallel active power filter
  • Saturated switching control method for three-phase parallel active power filter

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0042] The principle of three-phase APF is as follows: figure 1 shown. In the figure: L is the three-phase filter inductor; C is the DC side capacitor; R is the equivalent resistance of the inductor; ej (j=a,b,c) is the system power supply voltage; v dc is the DC capacitor voltage; i Lj is the nonlinear load current; i sj is the supply current; i cj is the compensation current of the three-phase APF; Indicates the harmonic component and reactive component in the load current. The working principle of the three-phase APF is to control the six switching devices S 1 ~S 6 On and off, so that the compensation current i cj Track command current It ensures that the grid side only contains sinusoidal active components; at the same time, the DC side voltage v dc stable at reference voltage According to Kirchhoff's law, the voltage and current equation of ...

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Abstract

The invention relates to a saturated switching control method for a three-phase parallel active power filter. The method comprises the following steps of: 1) establishing a switching system model according to each operation mode of the three-phase parallel active power filter; 2) constructing a common Lyapunov function to obtain state-feedback-based switching rules, wherein arg represents a subscript meeting an expression; 3) introducing an additional matrix G in case of saturated nonlinear constraints of the three-phase parallel active power filter, linearizing the saturated nonlinear constraints by using a convex domain method, and designing saturated switching rules capable of progressively stabilizing a saturated system by utilizing a Lyapunov function stability theory; and 4) compensating the harmonic current of a power grid by using the three-phase parallel active power filter under the action of the saturated switching rules.

Description

technical field [0001] The invention relates to a saturation switching control method of a three-phase parallel active power filter. Background technique [0002] With the increasing of non-linear loads in the power grid, the harmonics generated by it have a serious negative impact on the distribution network. In the meantime, various electrical equipment cannot work normally, additional harmonic loss, voltage distortion, communication interference and other problems. Active power filter is considered to be the most effective device for improving power quality and suppressing harmonics. [0003] The traditional active power filter is analyzed and designed based on the cycle average model, but this modeling method of approximating the small signal model will cause problems such as system instability or poor compensation effect when there is large signal interference. At the same time, in the actual APF control system, there is a saturated nonlinear limiting link. For examp...

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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 程新功宗西举裴兴华张静亮侯广松白万建陈早军张庆华张步胜欧朱建张梦华
Owner STATE GRID CORP OF CHINA
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