1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;2.Hangzhou Xiaoshan Power Supply Company of State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 311200, China
When large-scale renewable energy such as wind power is integrated into power grid, the intermittency and fluctuation of its output characteristics bring problems such as insufficient frequency regulation capacity and unsatisfactory frequency regulation performance to power grid. Therefore, a bi-level control strategy for power grid frequency regulation with participation of large-scale energy storage is proposed. Firstly, a criterion for switching between area regulation requirement and area control error allocation modes is proposed based on the analysis in the complex frequency domain. Secondly, considering technical characteristics of different frequency regulation power sources comprehensively, a bi-level control strategy is proposed for the coordinated response to automatic generation control instructions with large-scale battery energy storage and thermal power generation units. In the upper layer, the economic distribution of power is realized based on the frequency regulation cost function of power sources. In the lower layer, distributed optimal control of frequency is realized based on model predictive control. Finally, the economics and effectiveness of the proposed strategy are verified by simulation.
This work is supported by National Key R&D Program of China (No. 2016YFB0901300).
|||ZHANG Shupeng, DONG Shufeng, XU Chengsi, et al. Bi-level Control Strategy for Power Grid Frequency Regulation with Participation of Large-scale Energy Storage[J]. Automation of Electric Power Systems,2020,44(19):55-62. DOI:10.7500/AEPS20200312007|