A method for determining the value range of the 3rd harmonic current of the distributed power flow controller
A technology of power flow controller and value range, applied in AC network circuits, circuit devices, AC networks with the same frequency from different sources, etc. The output efficiency of the flow device, etc.
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[0077] One, at first introduce the method principle of the present invention.
[0078] figure 1 It is the equivalent diagram of the DPFC device when there is only one series-side converter.
[0079] Among them, the access point bus voltage is The bus voltage at the end of the line is R L +jX L is the line impedance on the series side, P L , Q L is the active and reactive power at the outlet of DPFC. The working principle of DPFC is that the three-phase converter VSC-SH1 on the parallel side passes through the three-phase transformer T 1 Injecting reactive power into the busbar -Q sh To increase the access bus voltage the magnitude of . At the same time absorb active power P from the bus sh As a single-phase converter VSC-SH2 on the parallel side, the 3rd harmonic current is emitted The active source, VSC-SH2 via Δ-Y transformer T 2 3rd harmonic current from neutral point After flowing through the series side converter and the line, it finally passes through ...
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