考虑混合量测的配电网二次约束二次估计方法

A Quadratic Constraint Quadratic Estimation Method Based on Hybrid Measurements for Distribution Networks

为适应同步相量测量技术的应用对配电网产生的影响,提出一种基于二次约束二次估计的配电网状态估计方法。基于配电网节点注入方程以及相量量测的特性,考虑数据采集与监控(supervisorycontrolanddataacquisition,SCADA)系统和同步相量测量单元(phasormeasurement unit,PMU)装置量测数据的融合,通过引入中间变量和二次等式约束,提出直角坐标系下二次形式的混合量测方程,建立了二次约束二次估计模型,并采用合适的优化算法求解,提高了计算精度和计算效率,并具有良好的抗差性。IEEE-123节点算例的分析验证了所提方法的有效性和实用性。

This paper proposed a quadratic constraint quadratic estimation(QCQE) model for distribution network state estimation in order to adapt to the impact of application of synchronous phasor measurement technology on distribution system. Based on node injection equation of distribution network and phasor measurement characteristics, this method took the mixed measurements collected with SCADA and PMU into account. By introducing intermediate variables and quadratic equality constraints, measurement models were proposed to establish QCQE model, which could be solved with suitable optimization algorithm, thus improving calculation accuracy and computational efficiency with better robustness. Case studies on IEEE 123-bus test system verified effectiveness and practicality of the proposed method.