LI Xinyu,LYU Yu,XU Jianzhong.Interline DC Power Flow Controller with Fault Current Limiting Function[J].Automation of Electric Power Systems,2020,44(21):80-88.
LI Xinyu,LYU Yu,XU Jianzhong.Interline DC Power Flow Controller with Fault Current Limiting Function[J].Automation of Electric Power Systems,2020,44(21):80-88. DOI: 10.7500/AEPS20200307003.
Interline DC Power Flow Controller with Fault Current Limiting Function
which endangers the safe operation of the entire system. The DC breaker used to cut off the fault current has a limited breaking capacity
which needs to work with the fault current limiter. With the increasing complexity of the DC power grid structure
the problem of power flow control is increasingly prominent. Based on the original power flow control capability of the DC power flow controller
this paper explores its fault current limiting capability and proposes a novel topology of the interline DC power flow controller with fault current limiting capability. The power flow control part adopts the interline DC power flow controller
and the fault current limiting part adopts thyristors to control the inductor into service
which realizes the current limiting. The working principle
operation process and theoretical analysis of the proposed controller are investigated
and simulation verification is performed in the single-terminal equivalent system and the four-terminal flexible DC power grid. The simulation results show that the controller can control the power flow of two lines during the normal operation
limit the fault current when a pole-to-ground fault occurs on the line
and complete the clearance of the fault current by cooperating with DC circuit breaker. The feasibility and effectiveness of the device and the control strategy are verified.
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