Experimental Findings and Theoretical Explanations on Time-Varying Immunity of <i>LCC</i>-HVdc Inverters to Commutation Failure Caused by Sending End AC Faults

A sending-end AC fault may lead to commutation failure (CF) in a line-commutated converter high-voltage direct current (LCC-HVDC) system. In this paper, a theoretical analysis of the impact mechanisms of a CF and its recovery speed on the transient stability of a sending-end power system (TSSPS) is performed. Firstly, the models of the sending-end power system and DC power of CF are established; the ramp function is utilized to characterize the DC power recovery process. Secondly, the swing direction of the relative rotor angle caused by a sending-end AC fault is discussed, and the DC power flow method is employed to theoretically analyze the impacts of CF and its recovery speed on TSSPS. Next, the mathematic relations between parameters of the voltage-dependent current order limiter (VDCOL) and DC power recovery speed are further derived. It is concluded that the impacts of CF and its recovery speed on transient stability are related to the swing direction caused by a sending-end AC fault, the inertia of generators, and the location of the rectifier station. Finally, the theoretical analysis is validated by Kundur’s two-area system and IEEE 68-bus-based AC/DC asynchronous interconnection test power systems, respectively.

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Experimental Findings and Theoretical Explanations on Time-Varying Immunity of LCC-HVdc Inverters to Commutation Failure Caused by Sending End AC Faults

Cited by 3 publications

References 31 publications

Resilience enhancement of active distribution networks under extreme disaster scenarios: A comprehensive overview of fault location strategies

Resilience enhancement of active distribution networks under extreme disaster scenarios: A comprehensive overview of fault location strategies

An SFCL Suppression Strategy for Inverter Commutation Failures Caused by Sending-End Faults in LCC-HVDC Systems

Impact Mechanisms of Commutation Failure Caused by a Sending-End AC Fault and Its Recovery Speed on Transient Stability

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