Study on the Fault Characteristic and the Fault Ride-Through Strategy of High-Voltage and Large-Capacity System
摘要
The high-voltage and large-capacity system for transmitting renewable energy has become a research focus in the field of power transmission. The strategies adopted by the system to deal with faults are directly related to the safety and reliability of the system. This paper mainly studies the fault characteristics and the fault ride-through strategy of the system. Firstly, the generation and impact of surplus power in the system are analyzed. The impact of absorbing surplus power by energy dissipation devices on the system is studied. Next, the applicability of different types of energy dissipation devices is studied. Finally, a joint fault ride-through strategy is proposed, and the strategy is verified on the PSCAD simulation platform. The simulation results show that when a fault occurs in the AC power grid at the receiving end of the system, the system can achieve fault ride-through through the combined action of the renewable energy power plant, the energy dissipation device, and the transmitting system. No serious overvoltage or overcurrent phenomena occur during the entire fault ride-through process, which verifies the effectiveness of the proposed strategy.