柔性直流与常规直流协调的紧急功率支援策略研究
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南方电网公司科技项目


Emergency Power Support Control Strategy of VSC-HVDC and LCC-HVDC Coordination
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Science and Technology Project of Southern Power Grid

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    摘要:

    柔性直流(VSC-HVDC)具有响应速度快、有功无功解耦、可向交流系统提供无功支撑等运行特性。将柔性直流纳入电网紧急控制系统,可在提升交直流电网暂态稳定性基础上降低常规切机切负荷控制的代价。基于扩展等面积法则(EEAC),研究直流紧急功率支援提高故障后系统暂态安全稳定性的机理;通过对不同类型直流功率调制的对比研究,指出柔性直流与常规直流(LCC-HVDC)的紧急功率支援在改善故障后系统功角恢复方面存在差异,紧急控制应考虑不同类型直流的控制优先级;提出为保障故障后电网暂态稳定所需直流紧急支援功率计算方法,并结合不同故障情况下直流功率支援的优先级制定相应的紧急协调控制策略。

    Abstract:

    The VSC-HVDC has the characteristics of fast responding, active and reactive power decoupling and AC bus voltage stabilizing. Emergency control system with VSC-HVDC control can enhance the level of transient stability of power grid while reduce the conventional control costs of generator tripping and load shedding. The mechanism of improving transient stability by emergency HVDC power support based on Extended Equal Area Criterion (EEAC) is proposed. Based on the comparison of different kinds of HVDC power modulation, the difference control effect on power angle recovery between VSC-HVDC and LCC-HVDC is shown. The priority of different kinds of HVDC in the emergency control should be taken into consideration. A method to calculate the amount of HVDC power support and the emergency coordination control strategy considering both the priority and the amount of HVDC power support in different fault conditions are proposed.

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陈睿,孙仲卿,杨银国,刘福锁,李威,郜建良,吴晨曦.柔性直流与常规直流协调的紧急功率支援策略研究[J].电力工程技术,2017,36(6):14-19,26

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  • 收稿日期:2017-06-17
  • 最后修改日期:2017-07-27
  • 录用日期:2017-09-11
  • 在线发布日期: 2017-11-27
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