| 引用本文: | 杨克杰,黄纯.配电网反时限过电流保护优化整定方法[J].电力自动化设备,2019,39(3): |
| YANG Kejie,HUANG Chun.Optimal setting method of inverse time over-current protection for distribution network[J].Electric Power Automation Equipment,2019,39(3): |
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| 摘要: |
| 提出一种含分布式电源的配电网反时限过电流保护优化整定方法。以配电网主保护与后备保护的总动作时间最小为目标函数，考虑保护选择性要求等约束条件，建立保护优化整定的数学模型；通过设置动态参数并引入最优解权重改进和声搜索算法，提高算法收敛速度和获取全局最优解的能力。利用改进的和声搜索算法求解模型。优化整定参数基于配电网各故障点的短路电流获得，在计算短路电流时考虑分布式电源对短路电流的贡献，使优化整定结果适用于含分布式电源的配电网。对两相、三相短路故障分别进行保护离线优化整定，实时根据故障类型自动选择优化整定参数，克服保护易受故障类型影响的缺陷。仿真结果表明，所提方法可有效提高有源配电网反时限过电流保护的选择性和速动性。 |
| 关键词: 反时限过电流保护 配电网 分布式电源 和声搜索算法 优化 |
| DOI：10.16081/j.issn.1006-6047.2019.03.026 |
| 分类号:TM77 |
| 基金项目:国家自然科学基金资助项目(51677060) |
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| Optimal setting method of inverse time over-current protection for distribution network |
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YANG Kejie, HUANG Chun
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College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
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| Abstract: |
| An optimal setting method of inverse time over-current protection for distribution network with DGs(Distributed Generations) is proposed. Taking the minimum total operation time of main protection and backup protection as the objective function and considering the constraints such as the selectivity, the mathematical model of protection optimization is established. By setting the dynamic parameters and introducing the optimal weight, the HSA(Harmony Search Algorithm) is improved in aspects of convergence speed and the ability to obtain the global optimal solution. The mathematical model of protection optimization is solved by the improved HAS. The optimal setting parameters are obtained based on the short circuit currents from different fault points in distribution network and the contribution of DGs is considered in short circuit current calculation, which makes the optimal setting results applicable to the distribution network with DGs. The off-line protection optimization is carried out respectively for the two-phase short circuit fault and three-phase short circuit fault, and the optimal setting parameters are selected automatically and real-timely according to the different fault types, by which the defect that the protection is easily affected by fault types can be overcome. Simulative results show that the proposed method can effectively improve the selectivity and speed of the inverse time over-current protection for distribution network with DGs. |
| Key words: inverse time over-current protection distribution network distributed power generation harmony search algorithm optimization |
