Coordinated control of active disturbance rejection and grid voltage feedforward for grid‐connected inverters

• Published in: IET power electronics
• Main Authors: Zhong, Guang‐Xin, Wang, Zhiteng, Zhou, Jiahua, Li, Jian, Su, Qingyu
• Format: Journal Article
• Language: English
• Published: 01.12.2022
• ISSN: 1755-4535; 1755-4543
• DOI: 10.1049/pel2.12428

Abstract This paper introduces the research on the inductance‐capacitor‐capacitor‐inductance grid‐connected inverter using active disturbance rejection and grid voltage feedforward coordinated control technology. The pade approximation is performed on the inductance‐capacitor‐capacitor‐inductance filter to derive the first‐order discretization mathematical model of the system. Use the tracking differentiator to suppress the noise pollution of the input signal and smooth the sudden change of the signal. The interference and uncertainty in the system are expanded into state variables, and the linear expansion state observer is used to observe the state in real time, and the control rate of the system is reasonably selected. Grid voltage feedforward is used to suppress the harmonic influence of the grid voltage on the grid current. Finally, a digital simulation and hardware‐in‐the‐loop experimental simulation platform was built. The evaluation results show that the strategy has good control performance and can achieve high‐performance control of the grid‐connected system, so that the grid‐connected current of the system meets the grid‐connected standard total harmonic distortion (THD) less than 5%.