High-capacity unified power quality conditioner based on chain structure and control method thereof
A technology of power quality and control method, applied in the direction of AC network voltage adjustment, reactive power compensation, multi-phase network asymmetry reduction, etc., can solve the problems of capacitor voltage imbalance, high requirements, small UPQC capacity, etc.
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[0030] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0031] The chain structure-based large-capacity three-phase three-wire system serial-parallel structure UPQC main loop topology proposed by the present invention is as follows: figure 2As shown, it includes series-connected voltage source converters and parallel-connected voltage source converters connected through the common DC bus. The capacitor is connected to the grid on the AC side (system side or power supply side). The parallel voltage source converter is a single-phase H-bridge structure, which forms a "back-to-back" structure with the H-bridge links on the series side. Each H-bridge link of the parallel voltage source converter is connected to the secondary side of the single-phase multi-winding transformer. On the load side (load side or DC side). The parallel voltage source converter plays the role of volta...
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