The traditional overcurrent protection' s setting value is computed by a fixed value, and is influenced by the operating modes and fault type. So the protection range is not fixed and not suitable for micro-grid. Typical fault characteristics is first analyzed, and combines the rapid development of information and communication technology, aimed at improving traditional overcurrent protection by real-time computing impedance and fault types and without the effects of the operating modes and fault types. PSCAD simulation proves that the method can adapt to the change of operating modes and fault type and improve the protection performance.%传统的过流保护,整定值是离线计算的固定值.受运行方式和故障类型的影响,保护范围不定,无法适用于微网中.通过分析微网特有的故障特性,以及结合目前迅速发展的信息通信技术,旨在对传统过流保护进行改进.实时计算系统阻抗和判别故障类型,使其保护范围不受运行方式和故障类型的影响.通过PSCAD建模仿真,证明了该方法能够自适应运行方式和故障类型的变化,提高了保护的性能.
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