基于多回直流功率转移的受端电网节假日期间电压控制  

Voltage Control for Receiving End Power Grid Based on Power Transfer in Multi Infeed HVDC Transmission System During Holidays

作　　者：缪源诚[1] 程浩忠[1] 庄侃沁[2] 

机构地区：[1]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市闵行区200240 [2]国家电网公司华东分部,上海市浦东新区200120

出　　处：《电网技术》2014年第11期3045-3051,共7页Power System Technology

基　　金：国家自然科学基金项目(51337005)~~

摘　　要：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。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 into AC 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.

关 键 词：节假日 多回直流功率转移 多直流馈入系统 无功交换 电压控制 

分 类 号：TM72[电气工程—电力系统及自动化]