基于灵敏度分析的多区域互联电力系统状态估计

研究了多区域互联电力系统的状态估计问题,提出了基于灵敏度分析的互联电力系统的状态估计方法.该方法将互联系统联络线两端子系统状态估计独立计算所得线路功率不匹配量作为各子系统的虚拟变化量测量,基于各子系统量测量、状态量和功率估计值之间的灵敏度关系,计算修正各子系统状态量和功率估计值,迭代求解互联系统状态估计解.仿真试验结果充分说明该状态估计方法计算结果准确、速度快,且在互联系统计算中心无法获得部分子系统数据情况下,能够最大限度地准确给出互联的可观测系统状态估计解.

State Estimation of a Multi-area Interconnected Power System Based on Sensitivity Analysis

The state estimation in a multi-area interconnected power system is investigated and a new approach based on sensitivity analysis is presented.The state estimators of subsystems at both ends of tie lines carry out individual calculation. And the mismatch power obtained is taken as the virtual variation of measurement.Based on the relations between the sensitivity among state variables,measurements and power estimates,the state vector and power estimates of the interconnected power system are resolved in the computation center by iteration.Test results show that the calculation is very accurate and rapid.Even with part of the subsystem data unavailable,this approach can still provide the state estimation solution for the interconnected power system composed of the observable subsystems.