摘要
分布式电源接入配电网使得传统的单电源辐射状网络变成部分线路多电源供电的复杂网络,仅依靠阶段式电流保护已不再适用,因此急需对配电网原有保护进行改造。而由于分布式电源的结构特征与控制方法不同于传统发电机,传统方向元件的灵敏性大大降低甚至存在误判的可能性。以逆变型电源接入配电网为例,提出一种新的方向判别元件。通过限制逆变型电源接入位置实现短路电流性质区分;设置电流整定值,将各保护进行分类并采用不同的方向判别逻辑,仅根据短路电流与整定值之间的大小关系,便能准确区分正、反方向故障。
The access of DG(distributed generation) to distribution network makes the traditional radiant network with single generation become a complex network with multiple generations, which makes the phased current protection no longer suitable.Thus, it is urgent to renovate the original protections of distribution networks. However, due to the difference between DGs and traditional generators in structure and control method, the sensitivity of traditional directional components significantly decreases,which makes misjudgment even possible. In this paper, an adaptive direction discriminating element is proposed by taking the distribution network with IIG(inverter-interfaced generation) as an example. Firstly, the characteristics of short-circuit currents are distinguished by restricting the access position of IIG. Then, by setting the current setting value, the relay protections at different locations are classified and equipped with different logics of determining the direction of fault. Finally, according to the relationship between the short-circuit current and the setting value, the faults of positive and reverse directions can be distinguished.
引文
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