基于用户侧储能的电压暂降分级治理方案及其经济性分析

Hierarchical voltage sag mitigation scheme based on user-side energy storage systems and its economic analysis

为提高工业园区内用户侧储能系统的经济效益,在储能削峰填谷的基础上,提出基于用户侧储能系统的优质电力园区电压暂降分级治理方案并对方案作了经济性分析。设计了用户侧储能系统的拓扑和控制策略,使之在常规削峰填谷功能的基础上具备电压暂降治理功能。为避免用户侧储能系统在不同控制模式之间切换可能带来的负面影响,提出了基于用户侧储能系统与动态电压恢复器(DVR)协同的电压暂降分级治理方案,其中第一级供电不含任何电压暂降治理设备,第二级供电由单一电压暂降治理设备提供,第三级供电由用户侧储能系统和DVR协同保障,并通过PSCAD/EMTDC中的仿真验证了所提分级供电方案的有效性。建立了用户侧储能系统的成本收益模型,以常规削峰填谷型用户侧储能系统为对比,对所提电压暂降分级治理方案作经济性分析,论证了对于受电压暂降影响较大的用户而言,所提方案可以显著提高用户侧储能系统的经济效益、缩短投资回收期。

A hierarchical voltage sag mitigation scheme based on user-side energy storage systems(UESS)was proposed for premium power parks to improve the economic benefits of UESS located in industrial parks,in addition to improving the peak-shaving and valley-filling function of UESS,and economic analysis was conducted.First,the topology and control strategy of UESS were designed so that the UESS could perform the voltage sag mitigation function in addition to the conventional peak-shaving and valley-filling function.A hierarchical voltage sag mitigation scheme based on the coordination of UESS and dynamic voltage restorer(DVR)was proposed to avoid the possible negative impacts of switching between different control modes of UESS.In this scheme,the lowest power supply level does not contain any voltage sag compensation equipment.The medium level of power supply is provided by a single device,while the highest level of power supply is ensured by coordinating UESS and DVR.The effectiveness of the proposed hierarchical power supply scheme was verified by simulations conducted in PSCAD/EMTDC.Finally,the cost and benefit model of UESS was established,and economic analysis of the proposed hierarchical power supply scheme was conducted by comparing the conventional peak-shaving and valley-filling type UESS,demonstrating that the proposed scheme can significantly improve the economic benefit and shorten the payback period of UESS for users suffering from voltage sag.