中文摘要：

考虑集电系统的风电场可靠性评估是风电场优化规划的基础,而当前少有研究对其进行定量计算。针对现有评估方法在频率指标计算中的困难和在闭环结构中应用的不足,提出一种基于保护区和等值风机模型的风电场集电系统可靠性建模与评估方法。该方法能有效减少系统故障状态数,对系统进行等效解环、化简,通过全概率公式得到系统停运表与概率、频率指标。采用中国西北某实际风电场为例验证方法的可行性,并分析拓扑结构、开关配置策略、馈线容量和馈线与断路器可靠性等因素对集电系统可靠性的影响。

英文摘要：

Reliability evaluation of wind plant considering collector grid is the basis of wind plant planning. Nevertheless, few studies on its quantitative calculation are conducted at present. Aiming at problems in existing methods with difficulty in frequency index calculation and inadequate application on closed-loop structure topology, an approach based on protect zone and equivalent generator models was proposed in this paper. The scale of outage state was decreased and the system was simplified equivalently. The system outage tables, probability and frequency indexes were obtained from the total probability formula. The proposed approach had been verified by the case studies on a wind farm project in the northwest of China. In addition, factors which have effect on the reliability of wind plants were analyzed, including the topology, breaker configuration, feeder line capacity, and reliability of elements.