发电技术 (Jun 2024)
Optimal Control Strategy of Peak Shaving of Flow Battery Energy Storage System Under High Wind Power Permeability
Abstract
ObjectivesUnder the background of the “dual carbon” target, the safety and economic problems of peak shaving caused by the construction of high wind power penetration system are urgent to be solved.MethodsBy using the solution of peak shaving and valley filling of battery energy storage system, a peak shaving optimization control method for zinc-bromine flow battery (ZBB) energy storage taking into account both technology and economy was proposed. According to the actual battery device, the structure analysis and the mathematical model construction of ZBB energy storage were carried out. Considering the technical effects of peak shaving, and taking the minimum standard deviation of load curve after peak shaving as the objective function, a bidirectional optimization control strategy for energy storage considering peak shaving effects was proposed. On this basis, according to the time of use (TOU) policy of the power grid, taking the technical and economic optimization as the objective function, an economic model of energy storage peak shaving based on the TOU price mechanism was proposed, and the optimal power timing results for energy storage were obtained. Finally, taking the load and wind power data of a certain area in Northeast China as an example, the effectiveness of the proposed strategy was verified by comparison.ResultsCompared with the original load, the proposed strategy reduces the daily average load peak-valley difference and peak-valley difference rate by 35.973% and 34.205%, respectively, and improves the peak shaving economic optimization by 5.582%. In addition, the problem of wind curtailment in the power grid is alleviated.ConclusionsThe proposed strategy achieves a certain peak shaving effect while maintaining a good peak shaving economy throughout its life cycle.
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