Optimal Digital Controller Design for Passive Stabilization of a Grid-Connected Three-Phase Inverter with LCL filter
Optimal Digital Controller Design for Passive Stabilization of a Grid-Connected Three-Phase Inverter with LCL filter
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DOI：
10.1109/ecce.2019.8912644
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发表时间：
2019-09
期刊：
影响因子：
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通讯作者：
T. Kato;Kaoru Inoue;Yuki Yamamoto
中科院分区：
文献类型：
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作者：
T. Kato;Kaoru Inoue;Yuki Yamamoto
有时会观察到由于逆变器和电网系统之间的相互作用而导致的不稳定性。提出了一种基于LCL滤波器的三相并网逆变器无源稳定的最优数字控制器设计方法，以改善输出频率阻抗特性，使其充分满足Nyquist稳定性判据。其原理是利用所设计的前馈回路特性将输出阻抗设计为无源，保证系统在电网系统阻抗较弱的情况下也能稳定运行。建议的三相控制系统是由最优数字控制设计的单相子系统的两相组合而得。介绍了该系统的工作原理和设计过程，并通过仿真和实验对所设计的系统进行了研究和验证。
Instabilities due to mutual interactions among inverters and grid systems are sometimes observed. This paper proposes an optimal digital controller design method for passive stabilization of a grid-connected three-phase inverter with LCL filter to improve output frequency impedance characteristics which sufficiently satisfy the Nyquist stability criterion. The principle is that the output impedance can be designed to be passive with the designed feedforward loop characteristics and the system is assured to be stable even if the grid system impedance is weak. The proposed three-phase control system is derived from combination of two phases of the single-phase subsystem designed by the optimal digital control. The principle and the design process are described and the designed system is investigated and validated through simulation and experimental results.