A STUDY OF HYBRID ENERGY STORAGE SYSTEM AND DOUBLE-CLOSED-LOOP ACTIVE DISTURBANCE REJECTION CONTROL APPLIED IN WIND POWER

摘要

The characteristics of wind power are instability and unpredictability. The allocation of energy storage device can be assisted to achieve energy flow between the Wind-Storage-Grid and to alleviate the impacts to the grid. Among the storage devices, the obvious advantages of hybrid energy storage caused the scholars' attention. In this paper, we consider superconducting magnetic energy storage (SMES) as the foundation and design a two-level cascaded structure of hybrid energy storage system (HESS), in order to achieve high efficiency and large capacity simultaneously. Following consideration of the uncertainty of wind power and inherent nonlinear and time-vary properties of energy storage devices, we took advantage of active disturbance rejection control (ADRC) and proposed a comprehensive control strategy independent of the accurate dynamic models of Wind-Storage-Grid. The dynamic performances of HESS are analyzed through the comparison of PI and ADRC in MATLAB/SIMULINK. The simulation results show that the double-closed-loop ADRC has better dynamic performances and wide adaptability under the condition of voltage/current fluctuation, change of reference values, system parameter variation and line-interactive.