Abstract
To improve the anti-disturbance ability of LCL grid-connected inverter system, a novel immersion and invariance based on active disturbance rejection control(I&I-ADRC) scheme is proposed in this paper. First, the target system with stronger anti-disturbance ability is immersed into the ADRC standard model by using the target system mapping method of immersion and invariance control. Then, the disturbance estimated by extended state observer (ESO) is compensated, and the immersion and invariance(I&I) control law is adopted to design the state error feedback（SEF）control law, thus I&I-ADRC is built, which has improved anti-disturbance ability and dynamic response performance. The stability of grid-connected inverter system is proved by Lyapunov theory. Simulation results show that the proposed strategy can effectively suppress the disturbance and has better tracking performance.
Highlights
Grid-connected inverter is the hub connecting distributed generation and public power grid, which plays a key role in the stability of the system
Based on the third-order linear active disturbance rejection control (LADRC), the derivative observation signal obtained from the linear extended state observer (LESO) is used as the active damping feedback to suppress the resonance in LCL inverter system [11]
The results show that compared with the traditional LADRC, the proposed strategy has better interference suppression ability and tracking performance
Summary
Grid-connected inverter is the hub connecting distributed generation and public power grid, which plays a key role in the stability of the system. With the development of control theory, a variety of control strategies with strong antidisturbance ability have appeared and widely employed in LCL inverter, such as sliding mode control, robust control, model predictive control, adaptive control and disturbance observer [3,4,5,6,7,8]. Based on the third-order LADRC, the derivative observation signal obtained from the linear extended state observer (LESO) is used as the active damping feedback to suppress the resonance in LCL inverter system [11]. The paper proposes a novel immersion and invariance based active disturbance rejection control (I&I-ADRC) for LCL grid-connected inverter to improve the anti-disturbance ability. The I&I-ADRC combines an immersion and invariance control law with a LESO, which obtains high anti-disturbance ability and better dynamic response performance. The results show that compared with the traditional LADRC, the proposed strategy has better interference suppression ability and tracking performance
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