Power fluctuation and allocation of hybrid energy storage system based on optimal exponential smoothing method and energy entropy

Abstract

In order to solve the problems of power quality reduction and power fluctuation caused by large-scale wind power grid-connected, an advanced control strategy to smooth the power fluctuation and allocation of hybrid energy storage system is proposed. Based on theoretical researches, the mathematical model of hybrid energy storage system is adopted to well analyse the fluctuation and smoothing strategy of wind power. Compared with the traditional filtering algorithms, the study proposes a method combined optimal exponential smoothing with complete ensemble empirical mode decomposition with adaptive noise and normalized energy entropy to improve the accuracy of grid-connected output power and power allocation. Furthermore, the fuzzy control theory is used to improve the reliability of the algorithm after obtaining the smoothed power output and initial power allocation instructions. To prove the validity of the algorithm, case studies are constructed to demonstrate the performance in this paper. Experiments and example simulations show that the proposed method can effectively realize adaptive power allocation and improve the accuracy of identification. After effectively improving the efficiency and service life of the energy storage system, it provides a basis for large-scale grid operation. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Active power smoothing control strategy of offshore wind power system based on reduced matrix converter

“…The existing solutions can be divided into the following categories: (1) installation of energy storage devices; (2) adopting variable pitch control; (3) adopting generator speed control; (4) adopting coordinated control of variable pitch and speed change. In [2], by installing battery storage devices, the output power of WPGS is clipped and valley-filled to reduce the amplitude of active power fluctuation. Although this method can smooth the active power of the WPGS to a certain extent, it needs to install an auxiliary energy storage device, which increases the investment cost of the WPGS.…”