Step-by-Step Controller Design for LCL-Type Grid-Connected Inverter with Capacitor–Current-Feedback Active-Damping
Step-by-Step Controller Design for LCL-Type Grid-Connected Inverter with Capacitor–Current-Feedback Active-Damping
复制标题
DOI：
10.1007/978-981-10-4277-5_5
复制
发表时间：
2014-03
影响因子：
6.7
通讯作者：
Chenlei Bao;X. Ruan;Xuehua Wang;Weiwei Li;Donghua Pan;Kailei Weng
中科院分区：
文献类型：
--
作者：
Chenlei Bao;X. Ruan;Xuehua Wang;Weiwei Li;Donghua Pan;Kailei Weng
对于LCL型并网逆变器，电容电流反馈有源阻尼相当于在滤波电容上并联一个电阻来阻尼LCL滤波器谐振。这种主动阻尼方式没有功率损耗，已得到广泛应用。本章提出了一种基于电容电流反馈有源阻尼和比例积分（PI）调节器作为电网电流调节器的LCL型并网逆变器的分步控制器设计方法。通过仔细检查稳态误差、相位裕度和增益裕度，可以获得满足系统规格的电容器电流反馈系数和 PI 调节器参数的满意区域。有了这个满意的区域，就可以非常方便地选择控制器参数和优化系统性能。此外，所提出的设计方法扩展到采用电网电压前馈方案的PI调节器或比例谐振（PR）调节器的情况。最后，给出了单相LCL型并网逆变器的电容电流反馈系数和电流调节器参数的设计实例，并通过实验验证了所提出的设计方法。
For theLCL-type grid-connected inverter, the capacitor-current-feedback active-damping is equivalent to a resistor in parallel with the filter capacitor to damp theLCLfilter resonance. This active-damping method has no power loss and has been widely used. Based on the capacitor-current-feedback active-damping and the proportional-integral (PI) regulator as the grid current regulator, this chapter proposes a step-by-step controller design method for theLCL-type grid-connected inverter. By carefully examining the steady-state error, phase margin, and gain margin, a satisfactory region of the capacitor-current-feedback coefficient and PI regulator parameters for meeting the system specifications is obtained. With this satisfactory region, it is very convenient to choose the controller parameters and optimize the system performance. Besides, the proposed design method is extended to the situations where PI regulator with grid voltage feedforward scheme or proportional-resonant (PR) regulator is adopted. Finally, design examples of capacitor-current-feedback coefficient and current regulator parameters are presented for a single-phaseLCL-type grid-connected inverter, and experiments are performed to verify the proposed design method.