以光伏为代表的逆变型分布式电源（IIDG）以T接方式并网导致配电网中原有距离保护装置存在不正确动作风险,据此,提出一种适用于IIDG-T接的配电线路自适应距离保护原理。首先,结合IIDG故障输出特性分析IIDG-T接的配电网中传统距离保护误动、拒动原因;其次,基于故障等值网络探究IIDG-T接的配电线路故障电气量的演变规律;最后,针对三相短路和两相相间短路两类故障场景构建了完备的自适应距离保护方案。仿真结果表明,所提方案仅需依托本地量测信息即可自适应调整定值,可降低配电网通信成本,同时所提方案不受IIDG-T接容量、出力波动、故障位置及类型的干扰,在IIDG-T接的有源配电网场景中具有良好的适用性。
Abstract
The inverter-type distributed generation （IIDG） represented by photovoltaics is connected to the grid by T-connection, which leads to the risk of incorrect operation of the original distance protection device in the distribution network. Based on this, an adaptive distance protection principle for distribution lines suitable for IIDG-T connection is proposed. Firstly, combined with the output characteristics of IIDG fault, the causes of misoperation and rejection of traditional distance protection in IIDG-T connected distribution network are analyzed. Secondly, based on the fault equivalent network, the evolution law of the fault electrical quantity of the distribution line with IIDG-T connection is explored. Finally, a complete adaptive distance protection scheme is constructed for three-phase short-circuit and two-phase short-circuit fault scenarios. The simulation results show that the proposed scheme can adaptively adjust the setting value only by relying on the local measurement information, which can reduce the communication cost of the distribution network. At the same time, the proposed scheme is not disturbed by the IIDG-T connection capacity, output fluctuation, fault location and type, and has good applicability in the IIDG-T connected active distribution network scenario.
关键词
分布式电源 /
配电网 /
继电保护 /
T接分支 /
距离保护 /
自适应整定
Key words
distributed power supply /
distribution networks /
relay protection /
T-connected branch /
distance protection /
adaptive setting
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基金
国家电网公司总部科技基金资助项目（5400-202340556A-3-2-ZN）
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