基于主导性评估的电网支路参数估计

摘要

A theory of branch parameter estimation based on dominance assessment is presented.First,to raise the measurement redundancy in parameter estimation,the definitions of dominant parameters and non-dominant parameters are given based on the application target of parameter estimation and the effect branch parameters have on state estimation,and the dominant parameters are selected as the parameters to be estimated.Second,to avoid the interference of the parameters with large diversity in the dominance,the definitions of strong dominant parameter and weak dominant parameter are further proposed,and an iterative estimation method is presented.The flow chart of branch parameter estimation based on dominance assessment and the implementation technique to determine dominant parameters are also given.Finally,the effectiveness of the new theory is tested on the IEEE 14-bus system and the IEEE 300-bus system.%系统地研究了基于主导性评估的电网支路参数估计的理论与方法。为提高参数估计的量测冗余度,从参数估计的应用目标及电网支路参数对状态估计的影响入手,给出主导参数、非主导参数的严格定义,并将主导参数确定为待估计的参数。为了解决主导性差异较大的参数在估计过程中相互干扰较大的问题,进一步提出强主导参数和弱主导参数的定义,并形成强主导参数和弱主导参数交替估计的参数估计方法。给出了基于主导性评估的电网支路参数估计的流程以及主导参数集的确定方法。IEEE 14节点系统和IEEE 300节点系统的仿真结果表明所提出的电网支路参数估计主导性评估方法的有效性。