Principles of building powerful microgrids for uninterrupted power supply of industrial enterprises

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Chinese explanation / 中文解读

中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。

Original abstract

Introduction. In conditions of unstable external power supply, industrial enterprises with critical electrical technological processes require reliable backup power supply. Traditional approaches to power supply backup, based on separate diesel generators or uninterruptible power supply systems, do not provide the required quality and continuity of power supply during long-term emergency outages from the national power grid. Problem. Existing theoretical principles for building microgrids are focused mainly on single-phase distribution networks of low power and do not take into account the features of powerful three-phase industrial microgrids. In particular, the problems of ensuring system stability under conditions of low inertia (absence of rotating masses of generators) and implementing «seamless» transitions between the parallel operation mode with the external grid and the autonomous («island») mode, as well as effective local power balancing taking into account the priority of consumers, remain unresolved. Goal. Development of the principles for building powerful three-phase microgrids capable of providing uninterrupted and high-quality power supply to industrial enterprises with critical energy consumers in conditions of unstable general power supply. Methodology. The study is based on a systematic analysis of international standards and modern publications in the field of microgrids, hierarchical control theory, methods of computer modeling of microgrid modes, as well as on the generalization of experience in designing, installing and long-term (more than one year) experimental and industrial operation of a microgrid with a capacity of more than 1.5 MVA at a real industrial enterprise in Ukraine. Results. Six basic principles for building powerful industrial microgrids have been developed and systematized. The effectiveness of these principles is confirmed by the successful operation of the designed microgrid, which includes a cogeneration unit (up to 1.5 MW), a diesel generator (up to 825 kW), a solar station (72.5 kW), four specialized uninterruptible power supplies with a total capacity of up to 1.95 MW, and an electricity storage unit with a capacity of up to 10 MWh. Scientific novelty. For the first time, the principles for building powerful three-phase industrial microgrids has been developed as a system of six interconnected principles, which, unlike existing approaches, cover the physical aspects of stabilization, system aspects of control and quality aspects of electricity (reactive power compensation, load balancing). The proposed principles are intended for microgrids with a capacity of more than 1 MVA and take into account the specifics of industrial enterprises. Practical value. The proposed principles provide a methodological basis for the design and modernization of powerful industrial microgrids in Ukraine and other countries with unstable power supply. References 36, figures 3.

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