CAJ | 학술논문

节假日期间，电网负荷大幅下降，潮流轻载导致容性无功过剩，电压显著升高。对于多直流馈入受端电网，受直流换流站内绝对最小滤波器投入组数的制约，密集落点的多个直流换流站在直流低功率运行方式下会同时向交流电网注入大量容性无功，导致电网电压大幅升高且难以通过常规电压调整手段控制。提出了考虑多回直流功率转移的电压控制策略，在不改变直流总送电计划的基础上，通过优化分配多回直流的功率来改变直流与交流电网的无功交换数量，进而有效降低电网电压。华东电网实际案例和仿真计算均显示，在多回直流之间进行有功功率转移能有效地改善多直流馈入受端电网的无功潮流分布，合理控制系统电压。
절가일기간，전망부하대폭하강，조류경재도치용성무공과잉，전압현저승고。대우다직류궤입수단전망，수직류환류참내절대최소려파기투입조수적제약，밀집낙점적다개직류환류참재직류저공솔운행방식하회동시향교류전망주입대량용성무공，도치전망전압대폭승고차난이통과상규전압조정수단공제。제출료고필다회직류공솔전이적전압공제책략，재불개변직류총송전계화적기출상，통과우화분배다회직류적공솔래개변직류여교류전망적무공교환수량，진이유효강저전망전압。화동전망실제안례화방진계산균현시，재다회직류지간진행유공공솔전이능유효지개선다직류궤입수단전망적무공조류분포，합리공제계통전압。
Due to significant decrease of power load during holidays, the light load leads to the excess of capacitive reactive power and it causes the voltage rise evidently. For AC power grid located at the receiving end of multi infeed HVDC transmission system, restricted by absolute minimum number of the switched on filter banks in the HVDC converter station, under low DC power operating mode the multi HVDC converter stations, which are densely arranged in a limited area, inject a great amount capacitive reactive power simultaneously intoAC power grid located at the receiving end of multi infeed HVDC transmission system, therefore AC grid voltage significantly rises and it is hard to be controlled by conventional voltage regulation measures. A voltage control strategy, in which the DC power transfer among multi HVDC infeeds is considered, is proposed, without changing the total HVDC transmission plan, the interchanged reactive power amount between HVDC transmission system and AC power grid is changed by optimally allocating the power among multi HVDC infeeds, and further the AC grid voltage can be effectively decreased. Both actual case of East China power grid and simulation results show that the active power transferring among multi HVDC infeeds can improve the reactive power flow distribution in the AC power grid at the receiving end of multi infeed HVDC transmission system effectively and the AC grid voltage can be controlled reasonably.