Implementation and Dynamic Validation of an Adaptive Protection System during Microgrid Restoration

Valov, Maria; Nuschke, Maria

doi:10.1109/icepe.2018.8559892

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…While island mode standards like [19] require accuracy of fault detection and clearance equal to the grid-connected mode, the traditional overcurrent protection devices become problematic in operation in these two modes. Indeed, especially with distributed IBG, [40][41][42][43][44] the fault current decreases and lead to longer tripping times (e.g., due to blinding effects) and unselective disconnection. For medium voltage (MV) MGs, [20] recommends using protection devices like the ones in the transmission system (e.g., current differential, distance protection).…”

Section: Protection Systemmentioning

confidence: 99%

“…This is why using fuses is very common in traditional LV networks. Common suggestions for MG protection are adaptive protection, additional protection devices, additional measurement points, directional protection devices, and using communication for protection devices [41][42][43][44][45][46], even if some devices need special adaptations [47]. Others [40] suggest using fault current limiters to keep unidirectional overcurrent relays with one single set of parameters for both the grid-connected and islanded mode.…”

Section: Protection Systemmentioning

confidence: 99%

“…Both strategies should ensure fast and selective detection of faults for the different fault current levels of the operation modes and different generation and load conditions. Adaptive protection, as in [42,43], is a decentralized protection strategy with centralized coordination.…”

Section: Protection Systemmentioning

confidence: 99%

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Microgrid Systems: Towards a Technical Performance Assessment Frame

et al. 2021

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A microgrid is an independent power system that can be connected to the grid or operated in an islanded mode. This single grid entity is widely used for furthering access to energy and ensuring reliable energy supply. However, if islanded, microgrids do not benefit from the high inertia of the main grid and can be subject to high variations in terms of voltage and frequency, which challenge their stability. In addition, operability and interoperability requirements, standards as well as directives have addressed main concerns regarding a microgrid’s reliability, use of distributed local resources and cybersecurity. Nevertheless, microgrid systems are quickly evolving through digitalization and have a large range of applications. Thus, a consensus over their testing must be further developed with the current technological development. Here, we describe existing technical requirements and assessment criteria for a microgrid’s main functionalities to foster harmonization of functionality-level testing and an international conception of system-level one. This framework is proposed as a reference document for assessment frame development serving both microgrid research and implementation for a comprehensive understanding of technical microgrid performance and its current assessment challenges, such as lack of standardization and evolving technology.

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