Abstract
At present, which has gradually become a technical development trend that the energy storage grid-connected inverter system is connected to the grid to ensure the stable operation of the whole system. However, the stability of the energy storage system itself is also very important for the safe operation of the power grid. Therefore, improving the stability of grid-connected energy storage system is still the key technology of current research. Aiming at the strong coupling and low-voltage ride-through fault of grid-connected system, a second-order mathematical model of grid-connected control system is established. Based on its state space model, a linear extended state observer (LESO) for state observation and a linear state error feedback (LSEF) control law for disturbance estimation are designed. The second-order linear active disturbance rejection control (LADRC) is introduced into the voltage loop, the stability of the second-order LADRC controller is proved by the Lyapunov stability theory, and the stability conditions are given. Finally, the simulation model of the grid-connected energy storage system is built on the MATLAB/Simulink digital platform, and the low-voltage ride-through fault is designed on the grid-side. The simulation results show that the effect of the second-order LADRC control is better than that of the traditional PI control obviously, which reflects the superiority of the second-order LADRC in controlling the grid-side low-voltage ride-through fault.
Highlights
In recent years, with the continuous development of new energy power generation technology, more stable and safe energy storage measures are of vital importance
Reference [7] is based on a voltage source converter, taking into account unbalanced and non-linear working conditions, the battery energy storage system (BESS) is connected to the DC link of the VSC through a bidirectional DC-DC converter, which is a distributed generation (DG) unit control structure
After parameterization, the parameters of the second-order linear active disturbance rejection control (LADRC) can be simplified as the observer bandwidth ω0 and the controller bandwidth ωc, and the selection of ω0 and ωc will affect the performance of LADRC directly
Summary
With the continuous development of new energy power generation technology, more stable and safe energy storage measures are of vital importance. Reference [7] is based on a voltage source converter, taking into account unbalanced and non-linear working conditions, the battery energy storage system (BESS) is connected to the DC link of the VSC through a bidirectional DC-DC converter, which is a distributed generation (DG) unit control structure. This control structure is suitable for island operation and grid-connected operation mode of microgrid. The main research idea of this paper is to use the energy storage system to adopt a high-performance second-order LADRC strategy to analyze the stability of Lyapulov and to control the grid-connected inverter for better realization the stability of DC bus voltage.
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