MMC converter DC power distribution network single-pole high-resistance grounding fault protection method
A technology for high-resistance ground faults and single-pole ground faults, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc., can solve the problem of imperfect DC protection equipment for DC distribution network protection and affect the accuracy of single-pole ground fault protection , complex fault features and other issues, to achieve the effect of improving safety and reliability, reducing the scope of power outages, and high accuracy
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[0024]In order to further illustrate the technical details and its advantages of the present invention, it will be described with reference to the drawings.
[0025]Such asfigure 1 As shown, a MMC converter DC power distribution network single extreme high-resistance ground fault protection method, including the following steps:
[0026]S1: According to the flow direction of the bus and the line;
[0027]S2: By monitoring the direction of each line current during normal operation of the DC distribution network, it is determined whether the mounting direction of the transformer is correct;
[0028]S3: Determine the ratio of each line current transformer, synchronously collect the DC distribution network bus line, the negative electrode voltage and the current value of each line start end, the negative electrode;
[0029]S4: By measuring the size, variation rate, pole voltage value of the positive and negative electrode voltage, integrated determination of a single-pole ground fault;
[0030]S5: When a...
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