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首页> 外文期刊>Energies >A Systematic Method for Designing a PR Controller and Active Damping of the LCL Filter for Single-Phase Grid-Connected PV Inverters
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A Systematic Method for Designing a PR Controller and Active Damping of the LCL Filter for Single-Phase Grid-Connected PV Inverters

机译：用于单相并网光伏逆变器的PR控制器设计和LCL滤波器的有源阻尼的系统方法

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摘要

The Proportional Resonant (PR) current controller provides gains at a certain frequency (resonant frequency) and eliminates steady state errors. Therefore, the PR controller can be successfully applied to single grid-connected PV inverter current control. On the contrary, a PI controller has steady-state errors and limited disturbance rejection capability. Compared with the L- and LC filters, the LCL filter has excellent harmonic suppression capability, but the inherent resonant peak of the LCL filter may introduce instability in the whole system. Therefore, damping must be introduced to improve the control of the system. Considering the controller and the LCL filter active damping as a whole system makes the controller design method more complex. In fact, their frequency responses may affect each other. The traditional trial-and-error procedure is too time-consuming and the design process is inefficient. This paper provides a detailed analysis of the frequency response influence between the PR controller and the LCL filter regarded as a whole system. In addition, the paper presents a systematic method for designing controller parameters and the capacitor current feedback coefficient factor of LCL filter active-damping. The new method relies on meeting the stable margins of the system. Moreover, the paper also clarifies the impact of the grid on the inverter output current. Numerical simulation and a 3 kW laboratory setup assessed the feasibility and effectiveness of the proposed method.
机译：比例谐振（PR）电流控制器在一定频率（谐振频率）下提供增益，并消除了稳态误差。因此，PR控制器可以成功地应用于单台并网光伏逆变器电流控制。相反，PI控制器具有稳态误差和有限的干扰抑制能力。与L和LC滤波器相比，LCL滤波器具有出色的谐波抑制能力，但LCL滤波器的固有谐振峰值可能会导致整个系统不稳定。因此，必须引入阻尼以改善系统的控制。将控制器和LCL滤波器的有源阻尼视为一个整体系统，会使控制器的设计方法更加复杂。实际上，它们的频率响应可能会相互影响。传统的试错法太耗时，设计过程效率低下。本文对作为整体系统的PR控制器和LCL滤波器之间的频率响应影响进行了详细分析。此外，本文提出了一种系统的方法，用于设计控制器参数和LCL滤波器有源阻尼的电容器电流反馈系数因子。新方法依赖于满足系统的稳定裕度。此外，本文还阐明了电网对逆变器输出电流的影响。数值模拟和3 kW实验室设置评估了该方法的可行性和有效性。

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