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Active power filter and control method thereof

A technology of power filter and control method, applied in active power filter, AC network to reduce harmonics/ripple and other directions, can solve the problems of control lag, system instability, etc., achieve fast dynamic response, and achieve dynamic performance and steady state performance, the effect of good suppression effect

Active Publication Date: 2018-04-17
XJ POWER CO LTD +3
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Problems solved by technology

[0013] The purpose of the present invention is to provide an active power filter and its control method, which is used to solve the problems that cannot be solved in the prior art. It not only retains the advantages of high compensation accuracy of repetitive control, but also solves the tracking error caused by repetitive controllers through PR control. The control effect lags behind a fundamental wave cycle, and it is easy to cause system instability in the case of severe nonlinear load changes. At the same time, fast dynamic response is guaranteed through PI control

Method used

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Embodiment Construction

[0056] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0057] Such as figure 1 The active power filter shown is a topology of a three-level inverter, and its equivalent circuit is shown as figure 2As shown, the definitions of each variable are as follows:

[0058] i s Represents the current value on the grid side, the grid current i s Refer to the waveform indicated by the arrow in the figure for the waveform; i L Represents the current value on the load side; i C Represents the compensation current value output by the APF, and its waveform refers to the waveform indicated by the arrow in the figure; i Lf Represents the fundamental component value of the load current; i Lk Representing the harmonic component value of the load current, the waveforms of the load voltage and load current refer to the waveforms indicated by the arrows in the figure.

[0059] Grid current i s equal to the lo...

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Abstract

The invention relates to an active power filter and a control method thereof. An repeated control mode is employed and an improved PR-controlled controller is combined. For the repeated control, memorization and correction of the harmonic disturbance are realized by using an internal mode; and floating tracking of sinusoidal currents is realized by the improved PR control. With the composite control, the current harmonic wave of the power grid is small; the dynamic response is done fast; the harmonic disturbance of the power grid is suppressed well; and optimization of dynamic performance andsteady-state performance are realized.

Description

technical field [0001] The invention belongs to the technical field of active power filter control, and in particular relates to an active power filter and a control method thereof. Background technique [0002] The control target of the active power filter (APF) is the grid current, and its performance requirements are high steady-state accuracy and fast dynamic response. Therefore, the APF needs to accurately track the output current command, the fundamental wave command is relatively easy to control, and it is difficult to track the harmonic command. [0003] For the closed-loop control of APF grid current, from the perspective of specific control methods, there are not only traditional hysteresis and PI control based on triangular wave comparison, but also relatively new control methods such as repetitive control and proportional resonance control. There are many types. In practical applications, repetitive control and proportional resonance control are widely used. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 李新元马骏曹智慧高鹏于浩然刘超王佰超吕孟帅刘秀华黄艳丽
Owner XJ POWER CO LTD
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