【摘要】 为克服S变换计算量大和不能准确估计某些电能质量扰动参数的缺陷,结合改进S变换和不完全S变换提出了一种估计电能质量扰动参数的新方法。首先给出了改进不完全S变换的计算过程,接着讨论了不同类型扰动信号求改进不完全S变换所需的最佳窗宽系数;然后介绍了参数估计的特征量提取,它是针对不同扰动频率点自适应地采用最佳窗宽系数求改进不完全S变换得到的模向量;最后说明了由这些特征量进行电能质量扰动参数估计的方法。仿真结果验证了所提方法具有算法简单、运算量小、估计精度高等特点。更多还原

【Abstract】 This paper proposes a new method of parameter estimation of power quality disturbances based on modified incomplete S-transform,which combines the modified S-transform with incomplete S-transform.The method complementary advantages in time frequency resolutions and computation speed.First,the computational procedure is provided.After that the optimal windowing coefficients in connection with different disturbances are discussed.Then the extraction of characteristic quantities is introduced,which are the module vectors obtained from the modified incomplete S-transform.The computation of each vector based on adaptive selection of optimal windowing coefficient.Finally,the parameters estimation method which utilizes these characteristic quantities are illustrated.Simulation results verified that the proposed method has characteristics of lower complexity,less computation and high precision.更多还原