可变遗忘因子RLS谐波电流检测方法研究

Study on Harmonic Current Detection Method Based on Variable Forgetting Factor Recursive Least-squares Algorithm

为提高谐波检测环节的动态响应性能和精度,提出了一种基于可变遗忘因子RLS算法的谐波电流检测方法。该方法给定一种判别条件来判断负载谐波电流动态过程是否发生,根据判别结果动态地给出遗忘因子的取值,化解了常遗忘因子RLS谐波电流检测方法中稳态与动态过程对遗忘因子不同的要求所产生的矛盾,从而提高算法收敛速度。仿真和实验结果表明所提方法比传统的递归最小二乘谐波电流检测方法具有更好的收敛速度和稳态精度。

To improve precision and the dynamic response characters of harmonic current detection,a harmonic current detection method based on variable forgetting factor RLS algorithm was presented. This method gives a judgment condition to identify the occurrence of the harmonic current dynamic process,and then the forgetting factor was assigned dynamically according to the situation to releases the contradiction cased by the conflicting requirements of forgetting factor value between steady process and dynamic process in the situation of invariable forgetting factor,so that the convergent speed was significantly improved. Simulation and experimental results prove that the harmonic current detection method presented has a better convergence speed and steady state accuracy than the traditional one.