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Three-level APF direct-current voltage balance control method capable of compensating even harmonics

A technology of DC voltage and even harmonics, applied in the field of APF, can solve problems such as DC voltage unbalance, and achieve the effect of solving DC voltage unbalance

Active Publication Date: 2020-11-27
辽宁荣信电力电子技术有限公司
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Problems solved by technology

This patent proposes a method based on using the integral value of the zero-sequence voltage to compensate the output voltage of the active filter when compensating for even-order harmonics, which can effectively solve the problem of DC voltage imbalance caused by compensating for even-order harmonics

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  • Three-level APF direct-current voltage balance control method capable of compensating even harmonics
  • Three-level APF direct-current voltage balance control method capable of compensating even harmonics
  • Three-level APF direct-current voltage balance control method capable of compensating even harmonics

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Embodiment Construction

[0024] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] Such as Figure 1-2 As shown, a three-level APF DC voltage balance control method that can compensate even harmonics includes the following steps:

[0026] Step 1: collecting grid-side three-phase voltage and three-phase current and performing filter processing, ua, ub, uc are grid voltages, Ia, ib, ic are current values;

[0027] Step 2: Obtain the DC voltage difference △UDC from the DC positive and negative voltages of the three-level APF after filtering;

[0028] Step 3. Obtain the zero-sequence current target value from the DC voltage difference △UDC of the APF, the DC capacitor value C, and the program sampling period Ts:

[0029] Iv0=-C*△UDC*1 / Ts

[0030] Among them: Iv0 is the zero sequence current target value;

[0031] C is the capacitance value of the DC capacitor;

[0032] △UDC is the positive and negative d...

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Abstract

The invention provides a three-level APF direct-current voltage balance control method capable of compensating even harmonics, and particularly relates to direct-current voltage balance control underthe working condition of compensating even harmonics. Conventional three-level equipment does not need to process even harmonics, but for a three-level active filter, multiple harmonics need to be compensated at the same time, and when a conventional algorithm compensates the even harmonics, direct-current voltage balance control cannot be effectively controlled. According to the method for compensating the output voltage of the active filter by using an integral value of the zero-sequence voltage during even harmonic compensation, the problem of DC voltage imbalance caused by even harmonic compensation can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of APF, in particular to a three-level APF DC voltage balance control method capable of compensating even harmonics. Background technique [0002] Three-level low-voltage active filter control has extensive research and application in China. The three-level APF DC voltage control of the three-phase four-wire system generally uses the zero-sequence current control method, which is relatively simple. However, the DC voltage control of the three-phase three-wire system cannot use the zero-sequence current control algorithm. Its DC voltage balance controls the control focus of the three-level active filter. Among them, the DC voltage control of the three-phase three-wire system mainly includes injection method and space vector modulation method, and the injection method mainly includes zero-sequence voltage injection control and harmonic injection control. Among them, the harmonic injection algorithm needs to...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J3/01
CPCH02J3/26H02J3/01Y02E40/50Y02E40/20
Inventor 杨洋张万金王飞义息鹏郭自勇崔效毓刘国辉黄仕鹏李海生王继浩刘永杰杨骏
Owner 辽宁荣信电力电子技术有限公司
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