基于安全域的区域综合能源系统储能优化配置

Optimal Allocation of Energy Storage in Regional Integrated Energy System Based on Security Region

区域综合能源系统的安全域是由若干基于N-1安全准则的实用化安全边界围成的超几何空间。而储能装置除了能够利用“低储高发”特性降低系统运行成本,还可作为N-1故障后的临时电源,扩展系统安全域,从而提升系统的安全性。首先,构建考虑储能的实用化安全边界,并提出全维安全裕度标准差指标;其次,建立以储能的全寿命周期成本及效益、最大供能能力(total supply capability,TSC)指标、全维安全裕度标准差指标为目标的多目标双层储能优化配置模型,下层优化模型包括运行成本优化和TSC求解优化模型;最后,结合具体算例对所提兼顾经济性与安全性的多目标双层储能优化配置方法进行验证。结果表明,通过合理配置储能装置可有效解决系统N-1不安全问题,并提升系统安全性指标。此外,该储能优化配置方法可提供经济性与安全性不同的配置方案集,为决策者提供更多选择。

A regional integrated energy system security region is a hypergeometric space surrounded by several practical security boundaries based on the N-1 security guideline.An energy storage device can not only reduce the operation cost of the system by using the low-storage high-incidence operation strategy,but also be used as the temporary power supply after an N-1 contingency so as to expand the security region and improve the safety of the system.Firstly,the practical security boundary considering energy storage is constructed,and the full dimensional security margin standard deviation index is proposed;Secondly,the multi-objective bi-level optimal allocation model of energy storage is built with the life cycle cost and benefit of energy storage,the total supply capability(TSC)index and the full dimensional security margin standard deviation index as the objectives,in which the lower optimization model includes the operation optimizing model and the TSC solution model;Finally,a case is given to verify the proposed method with consideration of economy and safety.The results show that the N-1 insecurity problem of the system can be effectively solved by reasonably allocating the energy storage devices,and that the security indexes can be improved.In addition,the method can generate a set of schemes with different economy and safety allocations,which offers more choices for the decision makers.