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首页> 外文期刊>IEEE Transactions on Power Electronics >A Robust Passive Damping Method for LLCL-Filter-Based Grid-Tied Inverters to Minimize the Effect of Grid Harmonic Voltages
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A Robust Passive Damping Method for LLCL-Filter-Based Grid-Tied Inverters to Minimize the Effect of Grid Harmonic Voltages

机译：基于LLCL滤波器的并网逆变器的鲁棒无源阻尼方法，可最大程度地减小电网谐波电压的影响

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摘要

In order to minimize the effect of the grid harmonic voltages, harmonic compensation is usually adopted for a grid-tied inverter. However, a large variation of the grid inductance challenges the system stability in case a high-order passive filter is used to connect an inverter to the grid. Although in theory, an adaptive controller can solve this problem, but in such a case the grid inductance may need to be detected online, which will complicate the control system. This paper investigates the relationship between the maximum gain of the controller that still keeps the system stable and the Q-factor for a grid-tied inverter with an RL series or an RC parallel damped high-order power filter. Then, a robust passive damping method for LLCL-filter-based grid-tied inverters is proposed, which effectively can suppress the possible resonances even if the grid inductance varies in a wide range. Simulation and experimental results are in good agreement with the theoretical analysis.
机译：为了最小化电网谐波电压的影响，并网逆变器通常采用谐波补偿。但是，在使用高阶无源滤波器将逆变器连接到电网的情况下，电网电感的较大变化会给系统稳定性带来挑战。尽管从理论上讲，自适应控制器可以解决此问题，但是在这种情况下，可能需要在线检测电网电感，这会使控制系统复杂化。本文研究了保持系统稳定的控制器的最大增益与带有RL系列或RC并联阻尼高阶功率滤波器的并网逆变器的Q因子之间的关系。然后，针对基于LLCL滤波器的并网逆变器，提出了一种鲁棒的无源阻尼方法，即使电网电感在较大范围内变化，该方法也可以有效地抑制可能的谐振。仿真和实验结果与理论分析吻合良好。

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