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对同步旋转坐标谐波检测法建立统一的正、负序数学模型,在此基础上对其进行定量研究和参数优化设计。针对同步旋转坐标谐波检测法数字实现中存在的采样延时与数字量化误差之间的矛盾,提出一种基于高采样频率的多级指数平均值低通滤波器,该数字低通滤波器能降低量化误差,提高谐波检测精度,算法简单,能实现同步旋转坐标(synchronous reference frame,SRF)谐波检测法的优化设计。仿真和实验都充分证实该文理论分析的正确性和所提出的数字低通滤波器的实用性。
A unified positive and negative sequence mathematical model of synchronous rotating coordinate harmonic detection is established, on the basis of which quantitative research and parameter optimization design are carried out. Aiming at the contradiction between sampling delay and digital quantization error in digital realization of synchronous rotating coordinate harmonic detection method, a multi-level exponential average low-pass filter based on high sampling frequency is proposed. The digital low-pass filter Reduce the quantization error, improve the harmonic detection precision, and the algorithm is simple, so that the optimal design of the synchronous reference frame (SRF) harmonic detection method can be realized. Both simulation and experiment fully confirm the correctness of the theoretical analysis and the practicality of the proposed digital low-pass filter.