Method for determining inductance value at alternating side of shunt active power filter

A technology of power filter and determination method, which is applied to active power filter, AC network to reduce harmonics/ripple, harmonic reduction device, etc., to achieve the effect of improving compensation effect and improving design accuracy

Inactive Publication Date: 2010-12-15
UNIV OF JINAN +1
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems that seriously affect the APF compensation effect caused by the estimation and trial and error methods of the existing APF AC side inductance value, Provide an accurate design method for the inductance value of the AC side of the shunt active power filter

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  • Method for determining inductance value at alternating side of shunt active power filter
  • Method for determining inductance value at alternating side of shunt active power filter
  • Method for determining inductance value at alternating side of shunt active power filter

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] A typical shunt active power filter such as figure 1 Shown (take three-phase as an example). u in the picture sa ~ u sc i sa ~i sc and r sa ~ r sc Respectively represent the voltage, current and internal resistance of the power supply side; i ca ~i cc and r a ~ r c represent the current and resistance of the compensation side, respectively. L a ~ L c is the AC side inductance. the s 1 ~s 6 are the corresponding six intelligent power modules. C is the DC side capacitance, U dc is the voltage across it.

[0025] According to Kirchhoff's law, the state space equation of APF is established:

[0026] di ca dt di cb ...

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Abstract

The invention relates to a method for determining an inductance value at an alternating side of a shunt active power filter, comprising the steps of: (1) analyzing APF (Active Power Filter) piecewise linearity switching characteristics caused by the switching and the breakage of a main circuit power device, and establishing a discrete model; (2) iteratively calculating an arithmetic solution of the discrete model by using a time domain method, i.e., calculating an instantaneous value and a steady state value of APF compensating current; and (3) determining the relationship between an inductance value at the alternating side of the APF and the tracking index required for the engineering through the instantaneous value and the steady state value of the compensating current obtained through calculation; and when the index of the engineering is known, the precise and reasonable inductance numeric area at the alternating side is obtained through the relationship. In the invention, the strong nonlinearity of the APF and the practical engineering index are comprehensively taken into consideration, and the inductance numeric area obtained through design is more accurate. The APF is ensured to meet the design requirement, and the compensating precision of the APF is improved.

Description

technical field [0001] The invention relates to an accurate method for determining the inductance value of the AC side of a parallel active power filter. Background technique [0002] With the rapid development of power electronic technology, power electronic devices are widely used in power systems. However, the nonlinear characteristics of power electronic devices bring serious harmonic pollution problems, which is seriously inconsistent with the development trend of power users' increasing requirements for power quality. Active power filters can effectively suppress harmonics whose amplitude and frequency vary from time to time in the power grid, and are widely used in power systems. [0003] The compensation current of the Active Power Filter (APF) is delivered to the power grid through the APF AC side inductance, and the compensation current output from the inductance includes fundamental active power, fundamental reactive power and harmonic current. The value of the...

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 宗西举程新功张永峰张静亮李美缪庆庆陈晓红王彦良徐刚
Owner UNIV OF JINAN
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