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  • 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.

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  • Optimized structure design
    • Based on the small-sized series thyristor modules, adopt U-shaped flat layer structure and include a sunken dedicated maintenance channel.
    • Compact structure and well integrality, facilitating for modular production, installation and maintenance.
    • Use suspension insulators and helical main water pipes for connecting the valve layers, with well shock resistance.
    • Adopt one-side-insulated indirect water-cooling columnar damping resistance, with clear, simple electrical connection and structure.
  • High reliability and availability
    • The valve subassembly and the valve tower both adopt water-electricity separation design, avoiding the waterway fault impact on the circuit.
    • The materials and components used in the valve are self-extinguishing and flame-retardant, which can reach UL94-V0 flame retardant grade.
  • Low loss and low thermal resistance
    • Adopt multi-objective constrained damping parameter optimization method, with low-loss converter valve damping and small thyristor reverse voltage stress.
    • Flow-disturbing helical channel used in radiator, with low thermal resistance and high thermal efficiency.
    High performance TCU
    • Use dual high-potential self-energy technology, with strong low-voltage ride through capability.
    • Provide the complete thyristor protections, trigger circuit fully installed in the shielded enclosure.
    • Adopt variable pulse width technology, effectively distinguishing protective trigger pulse and normal resend trigger pulse, eliminating the risk of tripping under OLT operating mode.
  • High integration VCU
    • Adopt high performance general hardware platform based on embedded technology, with high integration, fast processing speed and high reliability.
    • Provide online monitoring and fault alarm functions for the key components of the converter valve.
    • Fast fault location for the control unit link failure based on the built-in high-speed recording function, easy operation and maintenance.