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| Energy Management Strategy of PV and Micro-Turbine Hybrid Micro-Grid |
| Zhou Niancheng, Deng Hao, Wang Qianggang, Li Chunyan |
| State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China |
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Abstract The dynamic model and operating characteristics of photovoltaic and micro-turbine generation system are analyzed, and the power management strategy of PV and microturbine hybrid micro-grid is proposed. The time series method with variable steps is adopted to predict the power of PV and load based on the frequency characteristics of corresponding fluctuation, and the output powers of micro-turbine on grid-connected and islanding mode are controlled by the predicted result. In order to guarantee the reliability of hybrid micro-grid and improve the efficiency and lifespan of batteries, a modular control mode for battery management is proposed. When the micro-grid operated on the grid-connected mode, the controllable micro-turbine is used to smooth the photovoltaic power fluctuation and makes the hybrid microsource becoming a scheduled power source. When the micro-grid operates on the islanding mode, the storage battery which responses the rapidly changing power together with micro-turbine compensate the power difference between PV and load, and this could realize the stable operation of micro-gird. The PSCAD/EMTDC and MATLAB software are used for simulation and verification. The results show that the proposed technique is effectively for energy management of the hybrid micro-grid and can reduce the capacity of storage devices.
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Received: 13 December 2010
Published: 19 March 2014
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2012, Vol. 27 
