继电保护灵敏度是保障电力系统故障快速检测与准确动作的关键因素,但当前配电网规划中缺乏对其考量。随着分布式电源的接入可能导致继电保护灵敏度低于最小阈值,从而无法满足电气安装要求。因此,在不平衡配电网中提出一种考虑电流保护灵敏度的逆变型分布式电源（IIDG）优化配置方法。首先,分析IIDG并网对保护灵敏度有效边界的影响,并提出一种含IIDG的不平衡配电网继电保护灵敏度再评估方法;然后,计及继电保护灵敏度评估约束,构建以IIDG并网容量最大、系统综合成本及网损最小的多目标IIDG规划模型;最后,在改进后的IEEE 33节点三相配电网进行算例分析。结果表明,与未考虑灵敏度限值的优化方法相比,所提方法使保护装置作为本线路后备保护平均灵敏度提升8.67%,作为相邻线路后备保护平均灵敏度提升6.18%,从而验证了所提IIDG优化配置方法的有效性。
Abstract
The sensitivity of relay protection is a key factor to ensure the rapid detection and accurate action of power system faults, but it is not considered in the current distribution network planning. With the integration of distributed generation, the sensitivity of relay protection may be lower than the minimum threshold, which cannot meet the requirements of electrical installation. Therefore, this paper proposes an optimal configuration method of inverter-interfaced distributed generation（IIDG） considering the sensitivity of current protection in unbalanced distribution network. Firstly, the influence of IIDG grid connection on the effective boundary of protection sensitivity is analyzed, and a re-evaluation method of relay protection sensitivity of unbalanced distribution network with IIDG is proposed. Then, considering the sensitivity evaluation constraints of relay protection, a multi-objective IIDG planning model with the maximum IIDG grid-connected capacity and the minimum system comprehensive cost and network loss is constructed. Finally, an example analysis is carried out in the improved IEEE33 node three-phase distribution network. The results show that compared with the optimization method without considering the sensitivity limit, the proposed method improves the average sensitivity of the protection device as the backup protection of the local line by 8.67% and the average sensitivity as the backup protection of the adjacent line by 6.18%, which verifies the effectiveness of the IIDG optimization configuration method proposed in this paper.
关键词
配电网 /
分布式电源 /
过电流保护 /
电压不平衡 /
优化配置
Key words
power distribution networks /
distributed power generation /
overcurrent protection /
voltage imbalance /
optimal configuration
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基金
陕西省自然科学基础研究计划（2024JC-YBMS-405）; 西安市科技计划（24GXFW0071）; 国家重点研发计划（2023YFC2810902）
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