关键词: 混合多端高压直流输电, 整体控制策略, 稳态运行, 暂态故障

Abstract: A hybrid multi-terminal HVDC transmission system is established. The rectifier side of the system is two sets of twelve pulsating line commutated converter (LCC) in series, t the inverter side is double-ended three-phase two-level voltage source converter (VSC).. On the basis of expounding its topology and working principle, the overall control strategy of system is designed and analyzed. The steady-state operation and transient fault process of the system are simulated by the electromagnetic transient simulation software PSCAD/EMTDC. The simulation results verify the effectiveness of the hybrid multi-terminal HVDC transmission system control strategy.

Key words:  Hybrid Multi-terminal HVDC; overall control strategy, steady-state operation, transient failure