Flexibility Evaluation Method of Power System Considering the Impact of Multi-Energy Coupling

Abstract

With the increasing penetration of renewable energy resources, the problems of energy fluctuation and economic decline are exacerbated in the power system, especially on accommodating anti-peak-regulation of wind power. To make full use of flexible resources and improve the operational economy, a flexibility evaluation structure is proposed in this article, which can effectively evaluate the flexibility of the power system considering the impact of multi-energy coupling. First, the upward and downward adjustable margins of various flexible resources are quantified by analyzing their working principles and operating characteristics. Furthermore, considering the transmission capacity and energy conversion constraints, the flexibility margin index is proposed to evaluate the flexibility from the aspect of the acceptable range of wind power fluctuations. Second, the flexibility operating cost index is proposed to evaluate the economy of flexible resource dispatching, which can guide the operation of the power system with multi-energy coupling more economical and reasonable. Finally, a modified IEEE39-NGS20-HS4 integrated system model is established to verify the proposed methods. The simulation results demonstrate the effectiveness and superiority of the proposed index structure in flexibility and economy evaluation.