A coordinated control strategy is proposed for smoothing power fluctuation of grid-connected photovoltaic (PV) plant
including the operating point control of maximum power point tracking (MPPT) of PV’s and charging/discharging power control of hybrid energy storage system (HESS). The proposed strategy could effectively smooth PV power fluctuations within the acceptable range of the utility grid with the close cooperation between PV and HESS. Multi-objective nonlinear constraint model is adopted to optimize the charging/discharging power of the battery and supercapacitor. During the dispatching process
the lifetime of HESS
state of charge (SOC) deviation of HESS and the discharge efficiency are fully considered. Moreover
the moving average algorithm is utilized to dynamically control the operation point of the MPPT of PV. Besides
three typical scenarios of PV power fluctuations are established by using K-means clustering algorithm. Also
several comparisons are made between the proposed strategy and the conventional strategy which also uses HESS to smooth power fluctuations. Simulation results demonstrate that the proposed approach could not only achieve a significant effect of smoothing the PV power fluctuations
but also reduce the operation loss of HESS and prolong the lifetime of HESS.
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Related Author
YAN Gangui
SHA Qianli
LI Junhui
ZHAN Shuo
LI Yongyue
QIAO Xin
LI Hao
TAI Nengling
Related Institution
Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education (Northeast Electric Power University)
Key Laboratory of Control of Power Transmission and Conversion (Ministry of Education)
School of Smart Energy, Shanghai Jiao Tong University
School of Electric Power Engineering, Shanghai University of Electric Power
College of Electrical Engineering, Zhejiang University