A three-phase four-wire parallel apf double closed-loop nonlinear composite control method
A three-phase four-wire system, compound control technology, applied in AC network to reduce harmonic/ripple, AC network circuit, electrical components, etc. Difficulties in filter design and other issues
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[0086] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0087] figure 1 Flowchart of the new double-closed-loop nonlinear compound control method for three-phase four-wire parallel APF.
[0088] A three-phase four-wire parallel APF double-closed-loop nonlinear composite control method, the specific steps are:
[0089] Step (1): Detect the power supply voltage U s(abc) , power side current I s(abc) , load side current I L(abc) , APF compensation current I f(abc) and DC side upper and lower capacitor voltage U dc1 , U dc2 .
[0090] Step (2): The sum of the voltages of the upper and lower capacitors on the DC side U dc (Udc =U dc1 +U dc2 ) and DC side reference voltage value U dc_ref For comparison, the error signal is obtained, and the error signal is passed through the sliding mode PI controller to obtain the current i...
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