- Protection, Automation & Control
- Protection & Control
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- Energy Management
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Transmission Line Protection
PCS-8600 UHVDC Converter Valve System
The PCS-8600 UHVDC converter valve system is the demarcation point and the converter between AC system and DC system, and it mainly includes converter valve and valve control unit (VCU). The converter valve, as the core primary equipment of DC transmission system, is comprised of thyristor, equalizing damping circuit, reactor, thyristor control unit (TCU) and surge arresters, etc. VCU is the bridge between the control & protection system and the converter valve, and it is responsible for receiving control signals from the control & protection system, and according to the signals generating trigger pulses through appropriate modulation scheme, then sending the pulses to the converter valve, while receiving the return signals from converter valve, transmitting them to the control & protection system after treatment, and monitoring converter valve state.
By VCU, converter valve could cooperate with the DC control & protection system, and can realize AC/DC power conversion and quickly adjust transmission power. The converter valve system features fast adjust-speed, reliable operation, and it can guarantee stable output under normal conditions, in case of an accident it could provide emergency support. The system is applicable to long-distance DC transmission, back-to-back DC transmission and multi-terminal DC transmission under a variety of voltage level.