基于直流侧储能的新型统一潮流控制器优化设计

Optimal Design of a Novel Unified Power Flow Controller Incorporated With a Battery Energy Storage System at DC Side

首先提出一种新型的考虑有功源(active power,AP)的统一潮流控制器(unified power flow controller,UPFC)UPFC-AP,该有功源从可再生能源发电获取能量,同时使用储能电池组作为储能装置;然后提出了该UPFC-AP的优化设计方案,该优化设计能同时实现两个目标:AP的最优容量和最小化功率传输角。通过优化设计,得到了UPFC-AP的可行工作区域(feasible operating regime,FOR)。使用FOR和经济调度策略,推导得出了上游电源和AP输出功率的最优经济调度策略。在此基础上,提出了最优负荷跟踪机制,同时实现了最经济的上游电源和AP的功率调度,且使功率传输角最小,最后通过仿真实例验证了所提方案的有效性。

A unified power flow controller （UPFC） incorporated with a battery energy storage system at DC side was examined. The battery system forms an active power （AP） source. The design of the UPFC-AP was formulated as an optimization problem in which practical operating constraints of the network and that of the UPFC-AP were taken into consideration. A feasible operating regime was obtained, within which the range of the AP output power that can be dispatched for given load demand was prescribed. The application of a proposed economic dispatch strategy results in an optimal load tracking scheme, the effectiveness of which is demonstrated through numerical examples.