解列后局部孤网的自适应第三道防线配置方法  

Third Defense Line Configuration Method Adaptable to Isolated Local Power Grid After Splitting

作　　者：侯玉强[1,2] 李威[1,2] 郑惠萍[3] 刘新元[3] 王玉[1,2] 刘福锁[1,2] 

机构地区：[1]南瑞集团公司(国网电力科学研究院),江苏省南京市211106 [2]国电南瑞科技股份有限公司,江苏省南京市211106 [3]国网山西省电力公司电力科学研究院,山西省太原市030001

出　　处：《电力系统自动化》2017年第13期176-181,共6页Automation of Electric Power Systems

基　　金：国家电网公司科技项目"大电网严重故障下多稳定形态交互影响分析及控制技术研究"~~

摘　　要：通过薄弱交流断面与主网相连的局部电网在断面解列后转为孤网运行时,容易出现频率稳定或电压稳定破坏问题。以某实际局部电网发生的一起全停事故分析了现有低频低压切负荷和过频切机配置方法的不足,提出一种适用于解列后局部孤网的低频低压切负荷和过频切机配置方案,以改善第三道防线对孤立电网运行方式或电网规模变化的适应性。其主要思路是将低频低压切负荷及过频切机方案分为速动区和补偿区,前者用于快速平抑不平衡功率冲击,避免频率或电压大幅偏移;后者用于避免频率或电压快速变化时,低频低压切负荷或过频切机多轮次相继动作导致过控。基于实际电网的仿真结果验证了所述方法的有效性。The frequency and voltage stability of local network connected to the main power grid would probably be damaged when the weak transmission interface tripped. The inadequacy of traditional underfrequeney load shedding （UFLS）, undervoltage load shedding （UVLS） and over-frequency generator tripping （OFGT） configuration in an actual local power grid is analyzed. A new UFLS/UVLS and OFGT configuration scheme suitable for the local isolated power grid is proposed. Its key technique is to divide the UFLS/UVLS or OFGT into the celerity region and the compensation region. The former is used to quickly reduce the power imbalance and avoid a significant frequency or voltage offset while the latter to avoid the muhi circle successive action of UFLS/UVLS or OFGT when the frequency or voltage is rapidly varied to lead to over-controlled situation. The time domain simulation results of an actual power grid verify effectiveness of the proposed method.

关 键 词：低频切负荷 低压切负荷 过频切机 源网协调 速动区 补偿区 

分 类 号：TM712[电气工程—电力系统及自动化] TM732