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基于自适应噪声对消原理的自适应谐波电流检测方法具有实现简单、自适应性强等优点;但是算法中步长的选择需要在收敛速度和稳态精度之间折中考虑,大大降低了算法的实用性。在以往研究的基础上,提出了一种改进的变步长自适应谐波电流检测方法,它利用滑动积分器提取真正的跟踪误差,并采用带有自调整因子的模糊调整器来动态调整步长,能够保证谐波检测过程既具有较快的动态响应速度,又保持较小的稳态失调。此滑动积分器及模糊调整器结构简单,容易用数字信号处理器(digital signal processor,DSP)实现。同时对三相系统中谐波检测及各次谐波电流的检测方法进行了讨论,拓宽了算法的应用范围。仿真与实验结果验证了该文所提出算法的有效性。
The adaptive harmonic current detection method based on adaptive noise cancellation has the advantages of simple implementation and strong adaptability. However, the step selection in the algorithm needs to be compromised between the convergence speed and steady-state accuracy, greatly reducing Practicality of the algorithm. Based on the previous research, an improved variable step size adaptive harmonic current detection method is proposed, which uses the sliding integrator to extract the true tracking error and uses a self-adjusting fuzzy adjuster to dynamically adjust the step Long, to ensure that both harmonic detection process has a faster dynamic response speed, but also to maintain a smaller steady-state disorders. The sliding integrator and the fuzzy adjuster have a simple structure and are easy to implement by a digital signal processor (DSP). At the same time, the methods of harmonic detection and harmonic current detection in three-phase system are discussed, which broaden the application range of the algorithm. Simulation and experimental results verify the effectiveness of the proposed algorithm.