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Capacity Allocation of Energy Storage System Considering Its Action Moment and Output Depth in Rapid Frequency Regulation
Author(s): 
Pages: 454-464
Year: Issue:  12
Journal: Transactions of China Electrotechnical Society

Keyword:  Energy storagerapid frequency regulationaction momentaction depthcapacity allocation;
Abstract: An energy storage system(ESS) capacity allocation method considering its action moments and depth in rapid frequency regulation(RFR) is proposed in this paper. Firstly, frequency characteristics of regional power grids involving ESS were analyzed with sensitivity theory on complex frequency domain. Based on it, a comprehensive control mode composed of virtual inertial control and virtual droop control was proposed for ESS. Then, based on sensitivity theory on time domain and frequency regulation evaluation indices, the frequency response characteristics on time domain of ESS in RFR were derived in theory, the conditions to determine the reasonable action moments for ESS were analyzed, and the relative action moments and adopted control modes were presented according to these conditions; meanwhile, in accordance with the requirements of frequency regulation evaluation indices, the action depth was determined and its relationship with the rated power was derived, thus forming the capacity allocation method of ESS and putting forward its process. Finally, simulations ran with reference accidents of a typical grid as their initial conditions. The results show that the proposed method can satisfy the requirements of frequency regulation evaluation indices with a small ESS capacity.
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