Abstract
Photovoltaic grid-connected power generation systems are easily affected by external factors, and their anti-interference performance is poor. For example, changes in illumination and fluctuations in the power grid affect the operation ability of the system. Linear active disturbance rejection control (LADRC) can extract the “summation disturbance” information from the system and eliminate the disturbance at the fastest speed by controlling the signal before it affects the final output of the system. In this paper, an improved linear ADRC based on the principle of deviation control is proposed, and the voltage outer loop is controlled by an improved LADRC. This improved LADRC takes the deviation between each state variable and its observed value as the regulation basis for each state variable of the linear extended state observer (LESO). Based on the analysis of the bode diagram in the frequency domain, it can be concluded that, compared with the unimproved LADRC, the new LADRC has better disturbance rejection performance. The simulation results show that the control performance of the new, improved LADRC is better than that of the unimproved LADRC under different operating conditions, and it has better stability performance and anti-disturbance performance.
Highlights
In today’s era, environmental pollution is becoming more and more serious, and environmental protection has become a concern of people; in particular, the question of how to reduce the emission of pollutants and how to save resources has become a hot topic
This paper innovatively proposes an improved linear active disturbance rejection controller (LADRC) based on the error control principle: the adjustment process of each state variable in the traditional linear extended state observer (LESO) is analyzed and improved, and the voltage outer loop is controlled by this improved linear active disturbance rejection controller
In order to solve the problems of poor stability and susceptibility to external interference of the photovoltaic grid-connected inverter system under the traditional control strategy, this paper innovatively proposes an improved LADRC’s double closed-loop control strategy
Summary
In today’s era, environmental pollution is becoming more and more serious, and environmental protection has become a concern of people; in particular, the question of how to reduce the emission of pollutants and how to save resources has become a hot topic. The general form of the control parameter reaches 12, which is not conducive to engineering applications, and it is difficult to perform frequency domain analysis, commonly used in engineering to determine the stability boundary On this basis, in view of the shortcomings of the original nonlinear ADRC, inspired by the time scale proposed by Han Jingqing, Gao Zhiqiang proposed the concept of frequency scale, and related the ADRC parameters to the frequency, making the physical significance of the parameters of the auto-disturbance controller more intuitive [30]. This paper innovatively proposes an improved linear active disturbance rejection controller (LADRC) based on the error control principle: the adjustment process of each state variable in the traditional linear extended state observer (LESO) is analyzed and improved, and the voltage outer loop is controlled by this improved linear active disturbance rejection controller. Through the simulation under multiple working conditions, the superiority of the improved linear active disturbance rejection controller is verified through the performance index
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