A Short-Circuit Fault Handling Method for Flexible DC Grid Based on Combined HVDC Circuit Breaker
A high-voltage direct current and short-circuit fault technology, applied in the field of power system, can solve the problems of large fault current of circuit breakers, reduce the application prospect of combined high-voltage direct current circuit breakers, increase the manufacturing cost of circuit breakers, etc. The effect of reducing the number of power electronic devices and reducing investment costs
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[0029] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0030] The application occasion of the combined high-voltage direct current circuit breaker-based DC side short-circuit fault coordinated processing strategy of the present invention is a flexible direct-current power grid equipped with a combined high-voltage direct current circuit breaker connected by an overhead line based on a voltage source converter. exist figure 1 In the shown case, the DC grid contains 4 flexible DC converter stations. The flexible DC converter stations are connected by overhead lines. The converter station adopts the true bipolar arrangement, and for the convenience of analysis, the converter stations are all the positive poles of the true bipolar. The configuration of the combined high-voltage DC circuit...
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