LCL并网逆变器即时采样的混叠现象与抑制

发布时间：2018-04-12 17:28

本文选题：并网逆变器 + LCL有源阻尼　；参考：《中国电机工程学报》2016年15期

【摘要】：采用即时采样技术可有效地减小采样延迟,提高LCL并网逆变器有源阻尼控制的鲁棒性。然而,该采样方法受到频率混叠的影响,导致信号采样不准确,限制了其实用性。为分析并解决频率混叠问题,该文建立了基于实际数字信号处理器(digital signal processor,DSP)工作模式的频率混叠分析模型,系统地分析了采样时刻与频率混叠程度的关系。分析表明,无论是传统的采样方案还是即时采样方案,均存在一定的频率混叠现象,但相对来说,传统采样方案混叠程度较轻。在此基础上,结合LCL并网逆变器有源阻尼控制对信号采样的需求,分析了多次采样和即时采样附加高通滤波两种频率混叠抑制方案,给出了相应的仿真与实验结果。多次采样方案增加了软硬件的实现难度,而附加高通滤波器的方案较为简便,更具实用性。
[Abstract]:The real-time sampling technique can effectively reduce the sampling delay and improve the robustness of LCL grid-connected inverter active damping control.However, the sampling method is influenced by frequency aliasing, which leads to inaccurate signal sampling and limits its practicability.In order to analyze and solve the frequency aliasing problem, a frequency aliasing analysis model based on the actual digital signal processor digital signal processor (DSP) is established, and the relationship between the sampling time and the frequency aliasing degree is analyzed systematically.The analysis shows that both the traditional sampling scheme and the real-time sampling scheme have a certain frequency aliasing phenomenon, but the traditional sampling scheme has a relatively low degree of aliasing.On this basis, considering the demand of active damping control of LCL grid-connected inverter for signal sampling, two kinds of frequency aliasing suppression schemes, multiple sampling and real-time sampling plus high-pass filter, are analyzed, and the corresponding simulation and experimental results are given.The multiple sampling scheme increases the difficulty of software and hardware implementation, while the scheme with additional high pass filter is simpler and more practical.
【作者单位】：南京航空航天大学自动化学院;
【基金】：国家自然科学基金项目(51477077)~~
【分类号】：TM464

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