中性点不接地配网的三相潮流模型  

Three-phase Power Flow Model for Ungrounded Distribution Networks

作　　者：颜伟[1] 杨焕燕[1] 赵霞[1] 余娟[1] 杜跃明 王俊杰 邓亚拓 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400030 [2]萧山供电局,浙江省杭州市311200 [3]丽水电业局,浙江省丽水市323000

出　　处：《中国电机工程学报》2013年第19期135-141,10,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51177178);输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512712203)~~

摘　　要：针对中性点不接地系统无零序通路的特点,以零序电流为0的约束条件为基础,建立电源的PQ、PV和平衡端点模型以及负荷的恒阻抗与恒功率模型,进一步推导出注入电流形式的配网三相潮流模型。采用牛顿拉夫逊方法求解该模型,并通过IEEE13节点修正系统仿真分析不接地系统中零序电压的特点、三相功率不独立可控的特点、中性点电压与零序电压的关系以及相对地功率与相对中性点功率的差别。结果表明,网络结构不对称或平衡端点电压不对称时,零序电压具有非零特性;潮流不对称时,三相功率具有不完全可控性。In a neutral ungrounded system, zero sequence network is open with a characteristic of zero sequence current of 0. Based on this fact, endpoint models, including PQ, PV and balance forms, as well as load models, including constant impedance and constant power forms, were established. Furthermore, a three-phase power flow model with injection current form was developed for a distribution network. Newton-Raphson method was used to solve the presented model, and the modified IEEE-13 bus distribution system was tested to verify the characteristic of zero sequence voltage, the uncontrollability of three-phase power. Meanwhile, the relationship of neutral voltage and zero sequence voltage, also the discrepancy between phase-to-ground power and phase-to-neutral power was analyzed. The results show that zero sequence voltage has nonzero characteristic when the network structure or the voltage of balance endpoint is asymmetrical; three-phase power is not completely controllable when the power flow is asymmetrical.

关 键 词：电力系统 配电网 中性点不接地 三相潮流 注入电流方程 

分 类 号：TM74[电气工程—电力系统及自动化]