Abstract
In the photovoltaic inverter grid-connected power generation system, the output power of photovoltaic panels is affected by illumination and temperature. The change of output power of photovoltaic panels will lead to the fluctuation of DC bus voltage. If the control is improper, it will directly affect the regular operation of the system. In order to improve the performance of the grid-connected inverter system, an active disturbance rejection control method based on adaptive extended state observer (ESO) is proposed. Firstly, a feedforward PI current inner loop controller is designed, which simplifies the structure of the control system and improves the tracking performance of the current. Then, the DC bus voltage outer loop ADRC is designed, and a conversion method that ignores the essential difference between nonlinear/time-varying and time-varying/linear is proposed. Through the conversion of time-invariant nonlinear system and time-varying linear system, the stability of the extended state observer is proved by the Routh criterion. Secondly, to solve the problem of mutual restriction between the stability and observation accuracy of the extended state observer, an adaptive function online automatic tuning ESO parameter method is proposed. Finally, the simulation results show that the proposed method has better dynamic and static performance, and the grid-connected voltage and current harmonics are small, which proves the correctness and effectiveness of the proposed method.
Highlights
Photovoltaic power generation has the characteristics of environmental protection and efficiency, which is widely used in the fields of electric power, agriculture, modern architecture, and so on [1]
Since the output power of photovoltaic panels is affected by illumination and temperature [5], the DC-side bus voltage fluctuates, and improper control will directly affect the normal operation of the system. e existing technologies and methods to improve the stability of photovoltaic inverter grid-connected power generation system are mainly studied from three aspects: circuit structure, filter circuit, and control strategy
It is easy to induce resonance by using the filtering method, and it is easy to be affected by power grid impedance. e use of circuit structure leads to complex circuit structure; by improving the control strategy, the method becomes convenient, flexible, and low cost. e control strategy is usually the DC bus voltage control algorithm, controlled by the inverter
Summary
Received 29 June 2021; Revised 5 September 2021; Accepted 7 September 2021; Published 28 September 2021. In the photovoltaic inverter grid-connected power generation system, the output power of photovoltaic panels is affected by illumination and temperature. In order to improve the performance of the gridconnected inverter system, an active disturbance rejection control method based on adaptive extended state observer (ESO) is proposed. En, the DC bus voltage outer loop ADRC is designed, and a conversion method that ignores the essential difference between nonlinear/time-varying and time-varying/linear is proposed. Rough the conversion of time-invariant nonlinear system and time-varying linear system, the stability of the extended state observer is proved by the Routh criterion. To solve the problem of mutual restriction between the stability and observation accuracy of the extended state observer, an adaptive function online automatic tuning ESO parameter method is proposed. The simulation results show that the proposed method has better dynamic and static performance, and the grid-connected voltage and current harmonics are small, which proves the correctness and effectiveness of the proposed method
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