低电压加速反时限过电流保护

低电压加速反时限过电流保护(论文12000字)
摘要：新能源的应用的不断扩大，使分布式电源技术快速发展。在常见的低压配电网中，随着分布式电源的接入，电网的传统结构发生改变，使继电保护设备无法满足基本要求。因此，本文在分析了分布式电源的基本特性和会给传统三段电流保护及反时限过电流保护的影响后，加入了低压加速因子。在反时限过电流保护的原理上，其利用本地电流和电压的信息加速了继电保护装置的动作。该方案保证了保护切除线路故障的速动性，也能够满足继电保护要求的选择性。同时，建立线路模型，并通过matlab仿真软件对其进行验证，保证了原理的正确性。
关键词：低电压加速反时限过电流保护；分布式电源；配电网;Matlab
 
Application of inverse-time overcurrent protectionon Low Voltagegrid
Abstract：with the applicationsof green energy continue to expand, so the distributed power technology develop rapid. In the common low-voltage distribution network, with the distributed power supply, the traditional structure of the grid changes, so that relay protection equipment can not meet the basic requirements. Therefore, with analyzing the basic characteristics of distributed power supply and the influence of traditional three-stage current protection and inverse time overcurrent protection, ainverse-time overcurrent  protectionfactor is proposed. In the inverse-time overcurrent protection principle, the use of local current and voltage information to speed up the relay protection device action. The scheme ensures the quickness of the fault of the cut-off line, and also satisfies the selectivity of the relay protection requirements. At the same time, establishment of line model of grid ,and through matlab simulation software to verify it to ensure the correctness of the principle.
Key words:inverse-timeovercurrent protection;distributedgenerator; Distribution network;Matlab
 

目录
摘要    I
Abstract    II
1引言    1
2分布式电源简介    2
2.1分布式电源的定义与特征    2
2.2分布式电源电气模型    3
2.3分布式电源接入对配电网继电保护的影响    5
3电网的电流保护    7
3.1 电流保护原理    7
3.2三段式电流保护    8
3.3反时限过电流保护    9
3.3.1 保护整定    9
3.3.2 DG接入对保护影响    11
3.4低电压加速反时限过电流保护    12
4 算例分析    14
4.1算例模型    14
4.2 并网运行    15
4.3 孤岛运行    19
5总结与展望    22
参考文献    23
致谢    24