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| Boundary Conditions of Commutation Failure in Multi-Infeed HVDC Systems |
| Wang Zengping, Liu Xiyang, Li Linze, Yang Yujin |
| State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China |
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Abstract In multi-infeed HVDC systems, AC faults at the terminal will likely lead to concurrent commutation failures of multiple HVDC converters, eventually cause the blocking of multiple HVDC system. Therefore, it is important to explore the interaction of voltages at different inverter side AC nodes and identify boundary conditions of concurrent commutation failure. The expression of the multi-infeed interaction factor (MIIF) was derived considering the influence of the HVDC system by steady-state power flow equations at the receiving-end bus. Then, concurrent commutation failure interaction factor (CCFIF) was derived, according to the minimum extinction angle of the inverters and the change in the DC current after the fault. The boundary conditions of concurrent commutation failures were investigated by this CCFIF index. Finally, the simulation results on a modified CIGRE benchmark of dual-infeed HVDC test system demonstrate the accuracy of the boundary conditions of concurrent commutation failure.
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Received: 18 November 2016
Published: 26 May 2017
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2017, Vol. 32 
