同步发电机辨识参数对数据误差的敏感性分析

摘要

The results of parameters identification are usually imprecise due to the data error. In order to illustrate the influence, based on six order model of the synchronous generator, the sensitivity of the parameters and the data errors is studied. Firstly, a model between the steady parameters and transient parameters and the data errors are built respectively, and then the upper bound estimates of the sensitivity between the parameters and the data errors are derived. Using the proposed analysis method and taking current error for example, a numerical example of estimate equation of calculation parameter to data error is given based on the PMU current data. The conclusion shows that influence degree of current data error to synchronous generator parameter in order is static parameters, transient parameters and sub-transient parameters.%为了从理论上描述参数辨识结果受数据误差的影响程度,针对同步发电机六阶模型,给出了一种参数对数据误差的敏感性分析方法.基于稳态参数与暂态参数的辨识模型,分别构造了同步发电机稳态参数、暂态参数与数据误差的关系式,给出了参数对数据误差的上界估计.基于实测PMU数据,利用该分析方法,以电流误差为例,进行了计算参数对数据误差估计式的实例分析.结果表明,同步发电机参数受到电流数据误差的影响程度依次为稳态、暂态、次暂态参数.