一种针对高压环型网络的参数估计策略

A Parameter Estimation Method with High Voltage Looped Network AC Line Characteristic Consideration

在电力系统实际运行过程中,环型网络内部多条线路间潮流存在相互影响,导致状态估计结果残差在环网内部多处涌现,造成环型网络实际潮流与理论计算潮流偏差大。这一难题一直困扰着人们,特别是在电磁环网中表现更为明显。文章针对该题,分析了线路参数与有功、无功灵敏度关系,建立了高压交流线路有功潮流与电阻、无功潮流与电抗近似解耦模型。在此基础上提出了考虑环网特性的参数估计问题模型及求解算法。实现了环网参数问题的精确定位,解决了实际运行过程中环网状态估计偏差大的问题。最后,通过某省级电网实际系统算例证明了本文方法有效性。

Power system state estimation is the important basis of smart grid dispatching and controlling system, name- ly DS000 system. In the actual operation of the power system,the interaction of power flow between different power lines of the looped network is so significant that it makes the state estimation residuals very big, which resulting in the large deviation between the actual power flow and the theoretical power flow. In this paper,the sensitivity of AC line parameters to active power and reactive power is firstly analyzed, and then a decoupled model between active power and resistance,reactive power and reactance is buih. On this basis,a parameter estimation model and algorithm tak- ing looped network AC line characteristic into account is proposed. The proposed method could effectively improve the accuracy of state estimation and parameter. Finally, the onsite test results from actual electric system prove the va- lidity of the proposed method.