Due to its high instantaneous power and power density,flywheel energy storage has found wide application in energy storage microgrids and high-power UPS systems.Flywheel systems can quickly disburse energy which facilitates regulation of output frequency and voltage of microgrids.However,when the energy storage flywheel is discharging in a wide speed range,it is difficult to avoid mutual exclusion of high dynamic response and low speed stability,and conse-quently dynamic performance and discharge depth of the flywheel are seriously affected.To improve dynamic response and stability of flywheel energy storage in discharge mode,this paper puts forward sliding mode control-based constant-switch-frequency direct power control strategy.The control strategy facilitates simultaneously high dynamic performance and low speed stability and improves flywheel's utilization rate by 7.5％,as it makes the flywheel to achieve a 45％ increment of load mutation voltage recovery time,and to maintain stable following voltage within low speed section.The feasibility of this control strategy is confirmed through simulation analysis.
关键词
飞轮储能/动态响应/滑模控制/电池放电深度
Key words
flywheel energy storage/dynamic response/sliding mode control/discharge depth
维普
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