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access icon free Central energy management method for photovoltaic DC micro-grid system based on power tracking control

© The Institution of Engineering and Technology
Received 30/04/2016, Accepted 28/11/2016, Revised 08/11/2016, Published 02/12/2016

To reduce the impact of high penetration of renewable energy on the utility grid and suppress the influence of micro-grid power fluctuation on power quality, a power tracking control strategy for DC micro-grid has been studied. Furthermore, a central energy management method (CEMM) based on this control strategy has been designed. The DC micro-grid, which contains renewable energy and hybrid energy storage unit, is used to build a complete control system model according to the distributed power supply and its control system model. The power tracking control strategy has been analysed and designed based on frequency domain method. With the designed control strategy, the system can realise coordinated operation of the hybrid energy storage unit by absorbing the load power fluctuation within different frequency range. Furthermore, based on the CEMM, the system is controlled to absorb/deliver predefined amount of power from/to the utility grid under grid-connected mode. In this way, smooth switching between different modes and the stable operation of the micro-grid are realised. Finally, the function of the system is verified with an emulated DC micro-grid system.

Inspec keywords: distributed power generation; frequency-domain analysis; photovoltaic power systems; power generation control; power supply quality; energy management systems; power control

Other keywords: distributed power supply; photovoltaic DC microgrid system; load power fluctuation; microgrid power fluctuation; central energy management method; power tracking control strategy; utility grid; power quality; hybrid energy storage unit; renewable energy high-penetration; frequency domain method; CEMM; smooth switching

Subjects: Power and energy control; Solar power stations and photovoltaic power systems; Distributed power generation; Power supply quality and harmonics; Power system management, operation and economics; Control of electric power systems

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