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| Integrated Control of Primary Frequency Regulation Considering Dead Band of Energy Storage |
| Ma Zhihui1, Li Xinran1, Tan Zhuangxi1, Huang Jiyuan2, He Li1 |
1. College of Electrical and Information Engineering Hunan University Changsha 410082 China
2. State Grid Hunan Electric Power Corporation Limited Changsha Power Supply Company Changsha 410015 China |
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Abstract An integrated control of primary frequency regulation (PFR) considering the dead band of energy storage was proposed in this paper. Furthermore, a dead band limitation of energy storage in PFR was defined by analyzing the mechanism of dead band in conventional generators. In order to completely develop the potential of energy storage reflecting in the power grid PFR fast and precisely, the dead band limitation of energy storage was set within the range of the conventional generators, which could also improve the quality of power grid frequency effectively and avoid the frequent operation of the conventional generators. Then, through analyzing the influence of VDC and VIC on the frequency of the system, a control method that combines the virtual droop control (VDC) strategy and the virtual inertia control (VIC) strategy was proposed. To realize the coordination and mutual complement of the two control strategies, the control method was selected according to the frequency regulation demand of the system. Besides, in order to restrain the output of the energy storage, an adaptive control law based on a logistic function was adopted for the VDC and VIC, so as to avoid the consumption or saturation of state of charge (SOC). Finally, the typical regional power grid in Matlab/Simulink was simulated. The results show that the proposed integrated control can improve the quality of frequency effectively and reduce the percentage of conventional generator operations obviously.
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Received: 21 December 2018
Published: 29 May 2019
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2019, Vol. 34 
