戴维南等值跟踪的参数漂移问题研究

RESEARCH ON PARAMETERS DRIFT PROBLEM IN TRACKING THEVENIN EQUIVALENT

导出了戴维南等值参数的分式解析表达式;探讨了跟踪戴维南等值的参数漂移问题,并揭示了其本质原因;指出了在解析表达式中,分子分母真值与误差数量级间的关系决定参数漂移起伏的幅度,并据此提出了抑制参数漂移跌宕起伏的策略和候选采样运行点优选的方法:P-V关系检验和运行模式检验。该策略和方法能保证戴维南等值参数跟踪的结果,比较贴近实际。

This paper derives analytical fraction expression formulas of Thevenin parameters and thoroughly discusses the parameters drift problem in tracking Thevenin equivalent. After the essential reason of the parameters drift problem is revealed, the rise and fall ranges of parameters drift are decided by the relation between the magnitude order of the true values of numerator and denominator of analytical fraction expression formulas and their error. The strategy that the rise and fall of parameters drift can be rejected and the optimization method of the samples waiting to be selected are proposed. It is useful to adopt the P-V relation checking and the operation pattern checking. The works in this paper can guarantee that the results of tracking Thevenin equivalent parameters are close to the reality.