Hysteresis current control method of single-phase parallel type active power filter
A power filter and control method technology, applied in active power filtering, AC network to reduce harmonics/ripples, etc., can solve the problems of large current distortion and unfixed current error, and reduce current error and electromagnetic interference. Weak, low output current distortion effect
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[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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