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A Hysteresis Current Control Method for Single-Phase Parallel Active Power Filter

A technology of power filter and control method, which is applied in active power filter and AC network to reduce harmonics/ripples, etc. It can solve the problems of large current distortion and unstable current error, and reduce current error and electromagnetic interference. Weak, the effect of light output current distortion

Active Publication Date: 2018-05-29
SOUTHEAST UNIV
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  • Description
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Problems solved by technology

The main disadvantage of this method is that the current distortion is relatively large, and the current error is not fixed and fluctuates with the clock frequency and the current change rate.

Method used

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  • A Hysteresis Current Control Method for Single-Phase Parallel Active Power Filter
  • A Hysteresis Current Control Method for Single-Phase Parallel Active Power Filter
  • A Hysteresis Current Control Method for Single-Phase Parallel Active Power Filter

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] The main circuit structure of the single-phase parallel APF system described in the present invention is as follows: figure 1 shown. In the figure, APF adopts H-bridge structure, T 1 , T 2 represent the up and down switches of the left bridge arm respectively, T 3 , T 4 represent the up and down switches of the right bridge arm respectively; U dc is the DC side voltage; L is the grid side connection inductance; u s is the grid voltage; i c Compensation current for APF output.

[0028] Define switch functions Sa and Sb: Sa=0 represents switch T 1 Turn off, switch T 2 Open; Sa=1 means switch T 1 Open, switch T 2 Turn off; Sb=0 means switch T 3 Turn off, switch T 4 Open; Sb=1 means switch T 3 Open, switch T 4 off.

[0029] The present invention takes APF compensation of fundamental wave reactive current as a specific case to analyze the problem. se...

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Abstract

The invention discloses a hysteresis current control method of a single-phase parallel type active power filter. The switch on / off of the APF is commonly decided by three variables: APF output current, current error and power grid voltage; through the reduction of current change rage dic / dit, the reduction of current error theta and the reduction of APF output current distortion degree, the switches at a left bridge arm and a right bridge arm of the single-phase APF alternatively work in the positive / negative half cycle of the power grid voltage, and the switch loss of the APF power device is less. The method is equally suitable for the current tracking control of the APF in three-phase four-wire system, and is good in feasibility and practical value.

Description

technical field [0001] The invention relates to the technical field of electrical power electronics, in particular to a current control strategy applied to a single-phase parallel active power filter. Background technique [0002] Active Power Filter (APF for short), as an advanced harmonic control device, can effectively suppress nonlinear load harmonics. In practical engineering, the digital timing hysteresis current control method is widely used in APF current tracking control due to its advantages of fast dynamic response, strong control system robustness, fixed switching frequency and simple implementation. [0003] The basic principle of the traditional digital timing hysteresis current control method is: sample the command current i at a fixed frequency point * and APF output compensation current i c , calculate current error δ=i c -i * , by comparing the current error δ with the current hysteresis limit value to control the on-off of the APF switch, so that the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 许胜赵剑锋曹武刘康礼
Owner SOUTHEAST UNIV
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