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The fault characteristics of inverter-based distributed generator (IBDG) differ from those of traditional resources, which makes the conventional protection schemes ineffective in active distribution networks. This paper first analyses the features of measured positive sequence impedance at both ends of protected line section in internal and external fault cases. Based on the amplitude difference...
It is needed to take islanding or micro grid as the power supply which can provide fault current when it concerns the fault diagnosis, on this premise, can the protection still maintain their its selectivity, because the micro grid or the intentional island will also serve as a power point to provide fault current for the fault point. How to select a set of protection algorithm, fully take the impact...
The flexible operation modes of microgrid result in an extreme challenge for the protection and control of microgrid. Therefore, this paper proposed a centralized protection and control scheme for microgrid. To identify the faulted region conveniently, the microgrid is divided into several zones in advance. Intelligent circuit breakers communicate with each other, then send real-time information by...
This paper introduces the scheme for protection based on the needs of DG growth and automatic device control, which is to minimize fault duration, to prevent the DG damage by changing the substation grounding mode, configuration of protective device, the scheme for fixed value setting, automatic switch-on device and low-frequency low-voltage separation mode. Among them, the corresponding "Islands"...
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