微网反时限低阻抗保护方案

发布时间：2018-06-16 14:37

本文选题：微电网 + 反时限低阻抗保护　；参考：《中国电机工程学报》2014年01期

【摘要】：为解决传统配电网保护在不借助通信技术的情况下,很难满足微电网线路保护的复杂要求,提出了一种基于负荷阻抗的反时限低阻抗保护(inverse-time low-impedance,ITLI)方案。在微电网结构及故障特点的基础上,类比传统反时限过电流保护,对新型保护的原理、反时限动作特性、配合及整定方法进行研究,给出保护的特点及配置方法。分析过渡电阻对反时限低阻抗保护的影响,并提出低电压加速和配合加速2种改进方法。ITLI保护方案无需借助通信技术,不仅不受微电源控制方式影响,而且适用于微电网并网与孤岛2种运行状态。利用PSCAD/EMTDC建立微网模型,仿真结果表明,ITLI保护方案在不同运行方式下均具有良好的动作特性,并具备较好的抗过渡电阻能力。
[Abstract]:In order to solve the problem that it is difficult for traditional distribution network protection to meet the complex requirements of microgrid line protection without the aid of communication technology, a inverse time-limited low-impedance protection scheme based on load impedance is proposed. On the basis of the structure and fault characteristics of the microgrid, the principle of the new protection, the characteristics of the anti-time-limited operation, the coordination and setting methods are studied, and the characteristics and configuration methods of the protection are given by analogy with the traditional anti-time-limited overcurrent protection. This paper analyzes the influence of transition resistance on reverse time low impedance protection, and puts forward two improved methods of low voltage acceleration and matching acceleration. The ITLI protection scheme does not need to use communication technology, and is not affected by the control mode of micro power supply. And it is suitable for the two operation states of microgrid and isolated island. Using PSCAD / EMTDC to build a microgrid model, the simulation results show that the ITLI protection scheme has good operational characteristics and good resistance to transition resistance in different operation modes.
【作者单位】：上海交通大学电子信息与电气工程学院;阿尔斯通电网中国技术中心;
【分类号】：TM773

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