Abstract
The article examines main issues regarding the admissibility and conditions of operation of microgrids in the so-called " islanding mode" (IM), namely: identification of the appearance of an IM, regulatory and legal aspects of admissibility, and technical requirements for its implementation. Main methods and approaches to the issue of identification of IM, concepts of "planned" and "unwanted" IM are analyzed, possible advantages and consequences of the operation of a part of the distribution network in the IM are considered. An analysis and comparison of the legal framework regarding the possibility of IM usage in the countries of the European Union and Ukraine was carried out. Changes to the national legislation regarding the harmonization of regulatory documentation of Ukraine and the European Union, which were caused by Ukraine's desire to integrate its energy system into the European Network of Transmission System Operators for Electricity (ENTSO-E), are presented. The normative and legal documentation of both national and international use, regarding the norms of integration into the distribution networks of sources of distributed generation and their functioning in the IM, is presented and reviewed. Issues related to the technical support of the operation of the IM in the distribution network, subject to compliance with the relevant requirements for power supply quality indicators, are considered. Additionally, analysis of the advantages that distribution networks and consumers have with the possibility of using IM was carried out and the problems that may arise in the event of incorrect planning, identification and technical implementation of the isolated operation of a part of the network with local energy sources were identified. Information has been collected and presented regarding the maximum limits to the frequency and voltage in the distribution network, which are permissible for short-term deviations of these indicators depending on the standard that regulates the operation of the corresponding distribution networks. The importance of taking into account all the previously mentioned aspects of the operation of distribution networks in the IM is summarized, and conclusions are drawn regarding the feasibility of ensuring the possibility of the operation of networks in the specified mode in Ukraine
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