含逆变型分布式电源配电网自适应电流速断保护方案

近年来,针对含有逆变型分布式电源(IIDG)的配电网保护受到广泛关注。然而,现有的基于远方信息或就地信息的保护原理都存在着一定的局限性,尤其是IIDG以T形接入方式接于线路上的情况。为此,文中首先研究了IIDG的控制策略及其故障电流输出特性,进而提出了计及控制策略的含IIDG配电网自适应电流速断保护新原理;其次,提出了利用基于IEC 61850通信协议中的制造报文规范(MMS)服务获取IIDG的功率参考值和控制参数的保护实现方案,以较小的经济代价确保自适应电流速断保护在不同的分布式电源出力条件下具有固定的保护范围;最后,基于实时数字仿真(RTDS)和自主研发的保护装置平台,实现并验证了所提保护方案的有效性。

Adaptive Current Protection Scheme for Distribution Network with Inverter-interfaced Distributed Generators

In recent years, the protection of distribution network with inverter-interfaced distributed generators(IIDGs)has caused great concerns. However, there are some limitations in the existing protection principles based on the remote or local information, especially when IIDGs are connected to the transmission line. Therefore, a novel adaptive current protection scheme is proposed. First, with the fault control strategy of IIDG taken into consideration, the output fault current characteristics are analyzed followed by an adaptive current instantaneous trip protection principle. Then, in order to get the power reference value and control parameters, a telecontrol communication model based on manufacturing message specification(MMS)service in IEC 61850 protocol is proposed and implemented to ensure the proposed principle has a fixed protection range under different distributed generator(DG)output conditions at a lower cost. Finally, testing results using real time digital system(RTDS)and the self-designed protection device have verified the validity of the whole proposed protection scheme. This work is supported by National Natural Science Foundation of China(No. 51477057).