【摘要】 基于双单元柔性直流背靠背输电系统(back-to-back flexible DC transmission system, DC-BTB)两侧为同步交流电网的应用场景，提出一种根据DC-BTB两侧交流电网电压幅值和相角的变化自动调整DC-BTB有功功率的自动角差控制方法。针对双单元DC-BTB结构，提出单元间有功功率分配方法，研究自动角差控制下单元闭锁和交流故障的暂态特性。在实时数字仿真(real time digital simulation, RTDS)系统中搭建双单元DC-BTB模型进行仿真分析，结果表明自动角差控制稳态下功能投退冲击小，单元闭锁或交流故障穿越后能维持系统稳定运行。仿真结果验证了所提控制方法的有效性。更多还原

【Abstract】 In view of that the double-uni flexible DC back-to-back transmission system(DC-BTB) can be used to interconnect AC power grids on both side, an automatic angle difference control method is proposed to automatically adjust the active power according to the changes of voltage amplitudes and phase angles of AC network on both sides of DC-BTB. Meanwhile for the structure of the double-unit DC-BTB, an active power distribution method between units is proposed to study the transient characteristics of unit failure and AC fault under angle difference control. Based on the actual control and protection equipment, the real time digital simulation system(RTDS) simulation model of double-unit DC-BTB is built for simulating analysis. The results indicate the impact of inputting and quitting is small under the steady state of angle difference control, and this strategy can ensure stable operation of the system after unit interlock or AC fault ride-through. The simulation results verify the effectiveness of the proposed control method.更多还原