Convertor station containing resistance type superconducting current limiter and direct current circuit breaker, and direct current fault processing strategy thereof

Abstract

The invention discloses a convertor station containing a resistance type superconducting current limiter and a direct current circuit breaker, and a direct current fault processing strategy thereof. According to the technical scheme, a high-resistance characteristic of a superconducting current limiter after failure is utilized, breaking capacity of the direct current circuit breaker under prior art conditions can be fully exerted, and requirements for breaking current of the direct current circuit breaker in a multi-terminal flexible direct-current power grid are reduced. Meanwhile, a problemthat recovery speed of the resistance type superconducting current limiter is too low is solved by using a direct current fault restart protection module and a superconducting current limiter bypassprotection module, so that quick restart of a system after direct current faults becomes possible. In addition, a set of complete direct-current fault processing and restarting recovery strategy are provided aimed at the converter station containing the resistance type superconducting current limiter and the direct current circuit breaker.

Description

technical field [0001] The invention belongs to the technical field of electric power transmission and distribution, and in particular relates to a converter station including a resistive superconducting current limiter and a DC circuit breaker and a DC fault processing strategy thereof. Background technique [0002] There are contradictions in geographical conditions between my country's energy production and demand, and it is necessary to transmit electric energy from energy-sparse areas to load-intensive areas through "west-to-east power transmission" and "north-to-south power transmission". So far, the high-voltage DC transmission system (Line Commutated Converter based HVDC, LCC-HVDC) based on grid commutated converters has become the main way of long-distance large-capacity DC transmission. However, decades of operating experience have shown that it has the following insurmountable inherent defects: (1) LCC needs to rely on AC power for commutation during the commutati...

AI Technical Summary

Problems solved by technology

However, decades of operating experience have shown that it has the following insurmountable inherent defects: (1) LCC needs to rely on AC power for commutation during the commutation process, but new energy power plants such as wind power and photovoltaics do not It has the ability to provide AC power, so this directly limits the application of LCC-HVDC technology in many new energy grid-connected occasions

(2) Similarly, due to the excessive sensitivity of LCC to AC voltage, the inverter side system at the receiving end is prone to commutation failure, resulting in a large amount of DC transmission power interruption; in the case of multiple infeeds, multiple DC lines simultaneously Commutation failure will cause serious power flow transfer, which directly thre

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