A Judgment Method and System for Simultaneous Commutation Failure of Multi-circuit DC
A DC system, commutation failure technology, applied in the direction of power transmission AC network, etc., can solve the problems of long time consumption, large amount of calculation, multi-circuit DC transmission power interruption, etc., to simplify the calculation and analysis process, easy to use, and shorten time consumption Effect
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Embodiment 1
[0041] figure 1 A flow chart of a judging method for simultaneous commutation failure of multiple DC circuits provided by the present invention, as shown in figure 1 As shown, the present invention provides a method for judging the failure of multi-circuit DC simultaneous commutation, including:
[0042]Calculate the mutual impedance between at least two commutation buses on the inverter side of the DC system at the same AC system, and the self-impedance of the commutation buses on the inverter side of the DC system;
[0043] Calculate the multi-feed interaction factor according to the mutual impedance between the DC system inverter side commutation buses of the same AC system and the self-impedance of the DC system inverter side commutation buses;
[0044] According to the multi-infeed interaction factor and the preset universal critical multi-infeed interaction factor, it is judged whether the multi-circuit DC system will fail to commutate at the same time.
[0045] The mu...
Embodiment 2
[0059] Based on the same inventive concept, the present invention also provides a multi-circuit DC simultaneous commutation failure judging system, which may include:
[0060] The first calculation module is used to calculate the mutual impedance between at least two commutation buses on the inverter side of the DC system that fall on the same AC system, and the self-impedance of the commutation buses on the inverter side of the DC system;
[0061] The second calculation module is used to calculate the multi-feed interaction factor according to the mutual impedance between the DC system inverter side commutation buses of the same AC system and the self-impedance of the DC system inverter side commutation busbars ;
[0062] The judging module is used to judge whether the multi-circuit DC systems will fail to commutate at the same time according to the multi-infeed interaction factor and the preset universal critical multi-infeed interaction factor.
[0063] The second calculat...
Embodiment 3
[0075] The present invention is further described in detail with a two-feed AC and DC example system, figure 2 It is a schematic diagram of the equivalent system of the two-feed AC and DC example system, such as figure 2 As shown in the example system, the commutation buses on the inverter side of the two-circuit DC system in the two-feed AC and DC system are connected by one AC line, and the AC system model at the receiving end is represented by the series equivalent impedance of the system equivalent potential source.
[0076] In the example system of the two feed-in AC and DC systems, the inverter side of the two-circuit DC system is connected to the adjacent same side, and the rectification side is independent from each other, and the sending end system is an infinite unit.
[0077] Using the multi-circuit DC simultaneous commutation failure judging method provided by the present invention to quickly judge whether a three-phase metallic short-circuit fault on the commuta...
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