reliability, balance, mode, network, Microgrid.


The use of renewable energy installations in local systems affects the reliability of power supply. At the moment, in order to assess the reliability of power supply in local systems with renewables, there is a large number of indicators that are not directly related to each other.
Reliability is one of the key concepts in electricity. The reliability of the power system is a feature of the continuous supply of electricity to consumers to meet their needs. The concept of reliability includes such features as failure-free, durability and maintainability. But this terminology has not become commonplace, it has not embraced or streamlined many terms for reliability. Thus, many authors use the concepts of structural, mode (functional) and balance reliability. This separation is conditional, first, to simplify the solution of the task of assessing the reliability of complex networks, and secondly, based on quantitative assessments of the components, measures can be taken to improve the level of reliability.

Changes in energy sector related to the implementation of market relations and disyributed generation require an update of terminology that can be used to decompose the reliability assessment task. Because assessing the reliability of distribution grids in today's environment is quite a challenge.
The purpose of the article is to analyze the reliability of power supply for local systems with renewables. One of the main issues in this topic, despite the large amount of research work involved, is the uncertainty of the method for calculating the reliability of power supply in Microgrids. The paper assesses the reliability of power supply and proves the need to introduce new indicators for local systems with renewables, since distributed energy sources, including renewables, affects systems reliability. Such indicators will allow assessing the reliability by each factor individually, and will show the impact of each factor on the overall state of the system.


Rybak VP: “Assessing the impact of renewable energy sources on the quality of electricity supply”. Master's qualification work - Vinnitsa: VNTU, 2015. - 102 p.,

Lezhniuk, PD The influence of distributed generation on the reliability of electrical networks / PD Lezhniuk, VO Komar, SV Kravchuk, IV Kotilko // Bulletin of NTU "KPI", Series: New solutions in modern technologies. - Kharkiv: NTU "KPI". - 2018. - № 45 (1321). - P. 25-31. - doi: 10.20998 / 2413-4295.2018.45.04.

Denisyuk S.P. Assessment of the Effectiveness of the Collaboration of Dispersed Electricity Generation Sources, including Renewables, in Power Systems / SP Denisyuk, TM Bazyuk, DG Derev'yanko, - Bulletin of the Kremenchuk National University named after Mikhail Ostrogradsky. - 2013. - №3 (80). - P.54-59.

DG Derev'yanko, Analysis of features of stability and reliability of systems with integration of sources of dispersed generation / Derev'yanko DG, Sumenko K.Yu., Protsko V.G. // Materials of the conference "Energy. Ecology. Man". - 2013. - P. 432–439.

CIGRE, International Council on Large Electricity Systems,

Zhuikov V., Petergerya J. Intellectual systems for control of energy generation and consumption in local objects // Proceeding of the 2-nd Conference “Power Electronic Devices Compatibility” PEDC – 2001. - Poland. - Zielona Gora: Technical University Press. P. 208-212.

Beregovsky VZ, Adaptive energy efficient control of electric energy converters with regard to the consumption mode / Beregovsky VZ, Petergery Yu.S. - Tech. electrodynamics. Subject. issue of Power Electronics and Energy Efficiency. –2001. - Part 3. - P.27-29.

Renewable energy sources in local facilities / Yu.I. Yakimenko, EI Sokol, V.Ya. Zhuykov, Yu.S. St. Petersburg, OL Ivanin. - K .: Polytechnic Research Center, 2001. - 114 p.

Ackerman T., Knyazkin V. Interaction between Distributed Generation and the Distribution Network // Transmission and Distribution Conference and Exhibition: Asia Pacific IEEE / PES. - 2000. - Vol. 2. P. 1357-1362.

OV Kyrylenko, Technical Aspects of Implementation of Distribution Generation Sources in Electric Networks / OV Kyrylenko, VV Pavlov, LM Lukyanenko. - Tech. electrodynamics. - 2011. - №1. - P.46-53.

Wang S. Distributed generation and its effect on the distribution network system // Electricity Distribution - Part 1. 20th International conference and exhibition on. - 2009. - P. 1-4.

Dolezal J., Sautarius P., Tlusty J. The effect of dispersed generation on power quality in the distribution system // Quality and Security of Electric Power Delivery Systems.CIGRE / IEEE PES International Symposium. - 2003. P. 204-207.

Esposito G., Golovanov N., Lazaroiu C., Zaninelli D. Impact of Embedded Generation on Voltage Quality of Distribution Networks // Electrical Power Quality and Utilization, EPQU. - 2007. - Vol. 3. - No. 1. [Electronic resource]. - Access mode:

DG Derev'yanko, Analysis of Peculiarities of Connecting Generated Generation in Microgrid Systems Building / DG Derev'yanko, M. Yu. // Materials of the conference "Energy. Ecology. Man". –2013. - P. 348–357.

Baggini A.B. Handbook of Power Quality // Chichester, England; Hoboken, NJ: John Wiley & Sons. - 2008. - 642 p.

Vorobyov S.Yu. Questions of increase of reliability of work of power systems / Vorobyov S.Yu. - An energy engineer. - №3. - 2006.

Diakov AF Problems of reliability and safety of electricity supply to consumers / Dyakov AF - An energy engineer. - №2

VV Tomilov, Power quality management of power systems. / Tomilov VV, Golubkova RR, Elovenko VG - St. Petersburg: Publishing House of St. Petersburg State University, 2000. P. 30 - 31.

European standard EN 50160 Voltage characteristics of electricity supplied by public distribution systems, CENELEC TC 8X, 2006. NRS-048-2, Electricity Supply - Quality of Supply Part 2: Voltage characteristics, compatibility levels, limits and assessment methods.