An improved harmonic current detection method for APF system

A harmonic current and detection method technology, which is applied in the direction of only measuring current, measuring current/voltage, and AC network to reduce harmonics/ripples, etc., can solve problems such as poor dynamic response, improve accuracy and response speed, The effect of reducing complexity

Inactive Publication Date: 2018-12-21
XIAN AERONAUTICAL POLYTECHNIC INST
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Problems solved by technology

This method can adaptively adjust for many situations such as single-phase or three-phase circuit voltage distortion, grid parameter changes, and frequency offset, but the dynamic response effect is poor

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  • An improved harmonic current detection method for APF system
  • An improved harmonic current detection method for APF system
  • An improved harmonic current detection method for APF system

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Embodiment Construction

[0043] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] The flow process of an improved APF system harmonic current detection method of the present invention is as follows figure 1 As shown, the specific operation steps are as follows:

[0045] Step 1: Using the improved FBD algorithm, the three-phase load current i a (t), i b (t), i c (t) Calculate with the reference voltage parameter obtained by the PLL to obtain active equivalent conductance and reactive equivalent conductance;

[0046] Step 1 The specific method for obtaining active equivalent conductance and reactive equivalent conductance is as follows:

[0047] The system voltage reference vector is u=(u 1 ,u 2 ,...,u m ), current vector i=(i 1 ,i 2 ,...,i m ), the elements of the vector are the instantaneous values ​​of voltage and current of each phase respectively, and the related definitions are as follows:

[0048] In...

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Abstract

The invention discloses an improved harmonic current detection method of an APF system, which adopts an improved FBD algorithm to calculate three-phase load currents ia (t), ib (t), ic (t) and reference voltage parameters obtained by a PLL to obtain active equivalent conductance and reactive equivalent conductance. An improved ip-Iq method is used and comprises, firstly, the active current component ip (t) and the reactive current component iq (t) are obtained after the active equivalent conductance and the reactive equivalent conductance are linearly converted; Then, the DC component which are described in the specification in the active current component ip (t) and the reactive current component iq (t) are extracted by the improved moving average method described in the specification; finally, the three-phase harmonic current reference value described in the specification is calculated. The invention reduces the complexity of harmonic current calculation, improves the detection accuracy and response speed, and the improved harmonic detection method compared with the traditional algorithm, so that the static and dynamic performance of the system are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an improved APF system harmonic current detection method. Background technique [0002] The prerequisite for the realization of APF system functions is that the harmonic current detection link can accurately detect the harmonic current contained in the load in real time, so the accuracy and rapidity of the harmonic current detection algorithm will directly affect the compensation effect of the APF system. At present, the commonly used harmonic detection algorithms of APF system mainly include: ① detection method based on instantaneous reactive power theory. This method is currently the most widely used in the APF system, and p-q method, i p -i q method and d-q method. Among them, the p-q method is the earliest harmonic detection method, and it is only applicable to the APF system with three-phase symmetry and no distortion; i p -i q The law has a wide r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01G01R19/00G01R23/16
CPCG01R19/0092G01R23/16H02J3/01H02J2203/20Y02E40/20
Inventor 王瑜瑜刘少军叶婷李宁王超
Owner XIAN AERONAUTICAL POLYTECHNIC INST
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