一种改进的自适应谐波电流检测方法

针对现有的基于双曲正切函数变步长LMS算法的谐波电流检测仍存在稳态误差和收敛速度不能同时满足要求的问题，分析了一种在基于双曲正切函数变步长LMS算法的基础上改进的变步长算法，利用误差的时间均值估计建立步长与误差之间的新型双曲正切函数关系以控制步长的更新，降低稳态误差，提高算法的检测精度。并且同时对权值采用两次迭代更新，将两次迭代的结果作为新的权值，以加快权值的更新速度，提高算法的收敛速度。该算法具有较高的检测精度的同时还有较快的响应速度。Matlab/Simulink的仿真结果证明了该算法用于谐波电流检测具有很好的效果。

Improved Adaptive Harmonic Current Detection Method

Aiming at the existing harmonic current detection based on the hyperbolic tangent function variable step size LMS algorithm, there still exists the problem that the steady-state error and the convergence speed cannot satisfy the requirement at the same time. A variable step size LMS algorithm based on the hyperbolic tangent function is analyzed. Based on the improved variable step size algorithm, a new type of hyperbolic tangent function relationship between step size and error is established by using the mean time estimate of the error to control the update of the step size, reduce the steady state error, and improve the detection accuracy of the algorithm. At the same time, the weights are updated twice, and the results of the two iterations are taken as new weights to speed up the update of weights and improve the convergence speed of the algorithm. The algorithm has higher detection accuracy and faster response speed. The simulation results of Matlab/Simulink show that this algorithm has a good effect for harmonic current detection.