Abstract
The energy storage inverter system has the characteristics of nonlinearity, strong coupling, variable parameters, and flexible mode switching between parallel and off grid. In order to improve the control performance of the grid-side inverter of the energy storage system, an improved Linear Active Disturbance Rejection Control (LADRC) based on proportional differentiation is proposed to replace the traditional LADRC in the voltage outer loop control. In this paper, the observation gain coefficient of the sum of the disturbances of the traditional Linear Extended State Observer (LESO) is improved to a proportional differentiation link, which effectively reduces the degree of the disturbance observation amplitude drop and the phase lag, and increases the observation bandwidth of LESO. Compared with traditional LADRC, it not only improves the observation accuracy of LESO for disturbance, but also improves the anti-interference performance of LADRC. Finally, the control effects of improved LADRC and traditional LADRC on low-voltage ride-through at different degrees are analyzed and compared through simulation, which proves the rationality of the controller designed in this paper.
Highlights
In recent years, due to the needs of renewable energy and smart grid construction, power storage technology, as a new regulatory means, has been highly valued because of its flexible control and convenient use [1,2]
It can be seen from Equation (39) that the mathematical model of the energy storage grid-connected inverter is a second-order system, so the improved second-order Linear Active Disturbance Rejection Control (LADRC) based on the proportional differential can be used in the control of the energy storage inverter
In order to verify the effectiveness of the control strategy designed in this paper, the simulation model of grid connection of 0.3 MW super-capacitor energy storage system was established in MATLAB/Simulink
Summary
Due to the needs of renewable energy and smart grid construction, power storage technology, as a new regulatory means, has been highly valued because of its flexible control and convenient use [1,2]. In the case of strong coupling, strong nonlinearity, severe unknown disturbance and system parameters changing, the traditional PI control makes it difficult to achieve the ideal control effect For this reason, Reference [8] proposed an active disturbance control technology, only the rough model of the controlled object and the input and output signals of the system, which can design Extended State Observer (ESO) to observe the total disturbance and unmodeled error of the system [9], and make feed-forward compensation in the control quantity, so it has good engineering adaptability and robustness. The dynamic process and anti-interference performance of grid-connected inverter with energy storage under the control of improved LADRC and traditional LADRC are compared and analyzed by theoretical proof. The controller designed in this paper is verified by Matlab/Simulink simulation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
