Direct current grid fault current complex frequency domain calculation method
A fault current, DC grid technology, applied in the field of power transmission and distribution, can solve problems such as no fault self-clearing capability, weak damping, and DC grid damage
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[0011] In order to further illustrate the calculation process of the present invention, the principle of the invention will be described in detail below in conjunction with the accompanying drawings.
[0012] figure 1 It is a schematic diagram of a four-terminal DC grid. In the case of overhead line power transmission, the MMC DC grid usually adopts a symmetrical bipolar structure in which the positive and negative poles can operate independently. After a DC line failure of one pole, the other pole can still transmit half of the power. Thereby improving the reliability of DC grid power supply. The 4 MMC converter stations are connected by 4 positive and negative DC lines to form a network. Smoothing reactors and DC circuit breakers are installed at both ends of the lines, and grounding reactors are installed between the converter outlet and the neutral line. It is mainly used to suppress the rising speed of the fault current and buy a certain time for the action of line prote...
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