Microgrid tie-line power fluctuation mitigation with virtual energy storage

Abstract

There is a large amount of controllable loads in the microgrid. They can be described as virtual energy storage to participate in microgrid tie-line power fluctuation mitigation. Firstly, in order to meet the grid-connected requirement, the wavelet packet decomposition algorithm is used to smooth the tie-line power fluctuation. Furthermore, in order to prevent overcharge and overdischarge of battery or virtual energy storage, the power allocation between two types of energy storage is implemented equally based on the concept of energy. In addition, the fuzzy control strategy is applied to revise virtual energy storage power based on its SOC (i.e. state-of-charge), so that virtual energy storage can operate within a reasonable work range. Finally, an example is given to verify the effectiveness of the control strategy.

Keywords

• secondary cells
• distributed power generation
• fuzzy control
• microgrid tie-line power fluctuation mitigation
• virtual energy storage power
• grid-connected requirement
• wavelet packet decomposition algorithm
• battery overdischarge
• battery overcharge
• power allocation
• fuzzy control strategy
• state-of-charge