Research on the Improvement of Capacitive Opening and Closing Ability of Fast Circuit Breaker Under High Proportion of New Energy Access
With the high proportion of new energy access to the power system,especially the large-capacity distributed photovoltaic access to the 10kV medium-voltage distribution network with large randomness and volatility on the user side,it is easy to cause the reactive power compensation of the shunt capacitor bank on the 10kV side of the conventional substation to be switched frequently,and the conventional capacitive opening and closing special switch does not meet the requirements.Therefore,it is necessary to carry out the key technology research and engineering prototype development of high-capacity opening and closing electrical life vacuum circuit breakers.In this paper,the actual switching conditions of three-phase back-to-back capacitor banks are analyzed,and the key technical parameters of fast vacuum circuit breakers with high electrical life are proposed.The structure and working principle of the circuit breaker are designed.The coaxial vertical split-phase operation structure can be used to realize the selective correlation closing,and the opening and closing characteristics are optimized to adapt to the capacitive performance.The research on high-voltage and high-current aging technology has been innovatively carried out,which has improved the surface microstructure of the contact surface of the body contact,improved the anti-welding ability and medium recovery strength,correlation selection strategy is proposed.Based on this,a high-precision closing algorithm is studied,which fully suppresses the generation of closing inrush current and improves the capacitive opening and closing ability.Based on the above research results,12kV high capacitive electrical life fast vacuum circuit breaker was developed,and a third-party type test verification was carried out.The test results show that the fast vacuum circuit breaker completes two rounds of C2-level total 416 three-phase back-to-back capacitor bank opening and closing tests without phase selection and phase selection,respectively.The performance indicators meet the technical requirements and have engineering application conditions.
new energyreactive compensationfast vacuum circuit breakerdistributed photovoltaic
万方数据
维普
