Large-Signal Impedance Modeling and Stability Analysis of a Grid-Connected Inverter Considering the Influence of a Limiter in Different Control Links

Xiaodan Cui, Jialong Wu, Xiaoke Liu (), Yandong Chen, Zhiwei Xie, Feng Xue, Yucheng Liu and Cong Luo
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Xiaodan Cui: State Key Laboratory of Smart Grid Protection and Control, Nari Group Corporation, Nanjing 211106, China
Jialong Wu: State Key Laboratory of Smart Grid Protection and Control, Nari Group Corporation, Nanjing 211106, China
Xiaoke Liu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yandong Chen: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Zhiwei Xie: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Feng Xue: State Key Laboratory of Smart Grid Protection and Control, Nari Group Corporation, Nanjing 211106, China
Yucheng Liu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Cong Luo: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Energies, 2023, vol. 16, issue 17, 1-17

Abstract: The limiter in grid-connected inverter control may cause sustained oscillation in the system. The large-signal impedance model is provided since the traditional small-signal impedance model cannot accurately describe the characteristics of the limiter. In this paper, there are three established large-signal impedance models of grid-connected inverters that take into account the limiter in the phase-locked loop (PLL), the limiter in the current control loop and the limiter in the pulse width modulation (PWM). Based on the established models, the influences of these different limiters on the output impedance characteristics of the grid-connected inverter are discussed. Furthermore, the stability of the system considering the influence of different limiters is analyzed and the oscillation frequency and amplitude of the system are predicted. The simulation verifies the accuracy of the large-signal impedance model and the predicted oscillation frequency and amplitude.

Keywords: limiter; sustained oscillation; description function; large-signal impedance; oscillation frequency; oscillation amplitude (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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