On the Improvement of the Power Supply Reliability of 10 kV Auxiliary Power System in Hydropower Stations
Taking Shuibuya Hydropower Station as an example,the improvement methods for the power supply reliability of its 10 kV auxiliary power system are studied.Specific optimization schemes are proposed from two aspects:optimiza-tion of the interlocking control logic of the automatic switchover backup and the control of the auxiliary high voltage transformer circuit breakers.Firstly,a protection control logic of locking the automatic switchover backup in case of breaker protection tripping is added to prevent the switching of the automatic switchover backup on the faulty busbar and the escalation of the accident.Secondly,the control sequence of the auxiliary high voltage transformer circuit breakers in the shutdown process of the units is optimized,so that the units can continue to supply power to the auxiliary power sys-tem through the auxiliary high voltage transformer breakers after disconnection.The effectiveness of the optimization is verified by practical application,which ensures the power supply reliability of the auxiliary power system in emergency situations and reduces the risk of large-scale power outages.
hydropower stationauxiliary power systemreliabilityautomatic switchover backup
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