Unit connected operator with diode valve rectifier scheme

The application of a diode bridge rectifier unit connected to a generator feeding a sending-end HVDC station shows a substantial reduction in the station cost. One of the major problems of this configuration is its slow recovery from a DC line fault. The authors propose and analyze a few types of control and protection schemes for the generator. The minimum time required to restore full power subsequent to a DC line fault is studied for each scheme. The results of a digital computer study are presented, as are some results obtained from a real-time physical component HVDC simulator