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Controller Design for LCL-Type Grid-Connected Inverter with Capacitor-Current-Feedback Active-Damping

2017; Springer Nature; Linguagem: Inglês

10.1007/978-981-10-4277-5_5

2520-8861

Xinbo Ruan, Xuehua Wang, Donghua Pan, Dongsheng Yang, Weiwei Li, Chenlei Bao,

Advanced DC-DC Converters

For the LCL-type grid-connected inverter, the capacitor-current-feedback active-damping is equivalent to a resistor in parallel with the filter capacitor to damp the LCL filter 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 the LCL-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-phase LCL-type grid-connected inverter, and experiments are performed to verify the proposed design method.