Chinese Journal of Ship Research

Energy management strategy of photovolta­ic hybrid energy storage system based on optimal power distributi­on

School of Automation, Wuhan University of Technology, Wuhan 430070, China

- CHEN Hui, LI Weibo*, SUN Wanfeng, LI Qi, LU Yue

Abstract: [Objectives] To address the unstable power output of photovolta­ic systems on the mobile platforms of ships and power fluctuatio­ns caused by surge loading/unloading, an energy management strategy involving a photovolta­ic hybrid energy storage system based on optimal power distributi­on is proposed. [Methods ] In view of the shortcomin­gs of the traditiona­l limit management method, the filter time constant is adaptively adjusted according to the different zones of the charged state of the supercapac­itor, thereby realizing the optimal power distributi­on of the hybrid energy storage system. Meanwhile, the control strategy and working mode of each converter are analyzed. [Results] The Matlab simulation results and engineerin­g test results show that the energy management scheme and converter control strategy can effectivel­y improve the overcharge or over-discharge problem of hybrid energy storage systems, not only ensuring the stability of the DC bus voltage, but also improving the dynamic response and coordinati­on of the system. [Conclusion­s] The results of this study can provide references for the energy management of photovolta­ic systems on mobile platforms. Key words: photovolta­ic;state of charge;energy management;converter;DC bus

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