Analysis of the influence of sources of distributed generation on the power quality

І. Kozakevich; M. Kotyakova

Analysis of the influence of sources of distributed generation on the power quality

І. Kozakevich M. Kotyakova

Received 19.01.2021, Revised 14.04.2021, Accepted 27.04.2021

Abstract

Purpose. To develop a control system for inverters of distributed generation sources with minimization of harmonic distortions of the output voltage. This area is relevant due to the rapid development of renewable energy sources, as well as their potential impact on reducing the power quality. Research methods. The methods of automatic control theory in the analysis of dynamic system renewable energy source - inverter - filter - network and development of control system controllers, methods of mathematical modeling for analysis of processes in power system with renewable energy sources, methods of theoretical foundations of electrical engineering for analysis of active components and reactive power circulating between the energy source and the centralized power supply network. Scientific novelty. The principle of functioning of systems of integration of renewable energy sources into power supply grids with minimization of influence on indicators of power quality is developed. The developed principle is based on a twocircuit control system, which contains an external control circuit of the output voltage and inverter frequency, and the internal circuit - control of the components of the grid current vector. Practical significance. The developed control system can find practical implementation in systems of integration of renewable energy sources, as well as in systems for improving the power quality. Results. The principles of formation of control systems of grid inverters for minimization of their influence on power quality in a grid are considered. Analytical dependences describing a dynamic system renewable energy source - inverter - filter - AC network are considered and a model in the state space is made, which can be the basis for the synthesis of the control system. It is proposed to implement the internal current control system using H∞-regulators, and the external control system of the amplitude and frequency of the output voltage - using the method of statism

Keywords:

renewable energy sources; electric energy quality; harmonic components; law of statism; total harmonic distortion coefficient

Retrieved from Vol. 19, No. 1, 2021

Pages 175–179

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Kozakevich, І., & Kotyakova, M. (2021). Analysis of the influence of sources of distributed generation on the power quality. Journal of Kryvyi Rih National University, 19(1), 175-179. https://doi.org/10.31721/2306-5451-2021-1-52-175-179