Single-pole grounding fault line selection method for multi-terminal small-current grounding flexible direct-current system
A single-pole grounding fault and low-current grounding technology, applied in fault location, fault detection by conductor type, short-circuit test, etc., can solve problems such as difficulty in line selection, and achieve the effect of reducing investment, avoiding communication delay, and quickly identifying
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[0023]The present invention will be further described below in conjunction with specific embodiments.
[0024]This embodiment takes the four-terminal low-current grounded ring-shaped flexible DC distribution network as the research object, and its system structure is asfigure 1 As shown, the AC system is connected to the MMC converter through a connecting transformer. The medium voltage system uses pseudo-bipolar wiring to save costs. The positive and negative poles of the DC lines L1-L4 are equipped with protection devices P12-P41, F1-f3 are single-pole ground fault points respectively. The system adopts the common master-slave control strategy of medium voltage DC power distribution system, suppose MMC1 adopts constant DC voltage and constant AC voltage control, and the other three terminals adopt constant active power and constant AC voltage control.
[0025]figure 2 Middle: Larmk Is the equivalent inductance of the converter bridge arm, Carmk Is the equivalent capacitance of the conve...
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