Analysis and suppression of the aliasing in real-time sampling for grid-connected LCL-filtered inverters
Analysis and suppression of the aliasing in real-time sampling for grid-connected LCL-filtered inverters
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DOI：
10.1109/iciea.2016.7603599
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
Binfeng Zhang;Jinming Xu;Shaojun Xie
中科院分区：
文献类型：
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作者：
Binfeng Zhang;Jinming Xu;Shaojun Xie
实时采样和反馈可以有效地减小采样延迟，提高并网LCL滤波逆变器主动阻尼控制的鲁棒性。然而，这种方法的实用性将受到采样的混叠问题的限制。针对数字信号处理器（DSP）的混叠问题，根据DSP的实际工作模式，建立了混叠分析模型，系统地分析了DSP采样时刻与混叠程度的关系。结果表明，传统同步采样方法的混叠现象比实时采样方法的混叠现象要轻。此外，结合主动阻尼对信号采样的要求，提出了多次采样和实时采样加高通滤波器两种抑制混叠的方法。仿真和实验结果表明，多次采样增加了软硬件实现的难度，实时采样加高通滤波器简单实用。
Real-time sampling and feedback can effectively reduce the sampling delay and improve the robustness of the active damping control for grid-connected LCL-filtered inverter. However, the practicability of this approach would be limited by the aliasing problem of sampling. In order to solve the aliasing problem, a systematic analysis is done to figure out the relation between the sampling instant of digital signal processor (DSP) and the level of aliasing by establishing an aliasing analysis model based on the actual DSP working mode. Results show that the aliasing of traditional synchronous sampling method is lighter than that of the real-time sampling. Besides, combining with the demand of signal sampling for active damping, two methods including the multiple sampling and the real-time sampling with additional high-pass filter are presented to suppress the aliasing. Finally, simulation and experimental results show that the multiple sampling increases the difficulty of the software and hardware implementation, and real-time sampling with additional high-pass filter is simple and practical.