ВОЗМОЖНОСТИ КОМПЕНСАЦИИ РЕАКТИВНОЙ МОЩНОСТИ В СЕТИ ПОСРЕДСТВОМ ВЫСОКОМОЩНОГО РЕКУПЕРАТИВНОГО ЭЛЕКТРОПРИВОДА ПЕРЕМЕННОГО ТОКА

Abstract

Relevance At present, there is no complete understanding of the possibilities of reactive power compensation by means of high-power regenerative AC drives (RACD) with active frondend rectifiers (AFE), given the limitations and associated problems with electromagnetic compatibility. Aim of research The article is devoted to the issues of reactive power compensation and improvement of the voltage quality in the grid by high-power RACD with AFE. Research methods Methods of theoretical and experimental researches are applied in the work. Results It was noted that the smooth component of the first harmonic of the AFE output voltage is limited by the voltage in the DC link and the maximum allowable AFE current, and this affects the range of transmitted reactive power in the system «RACD with AFE – grid». Thus, there are restrictions for the generation of reactive power in the system «RACD with AFE – grid», which requires their special calculation in the synthesis of the control system. Power quality improving by powerful RACD with AFE is possible only with the correct choice of the grid connection, the switching frequency of semiconductor modules, resonance analysis, AFE control system parameters and thermal control of the power modules. The experimental curves of current consumption from the grid presented in the paper with two different PWM algorithms for the AFE demonstrates a decreasing of current total harmonic distortion. Keywords: active front-end rectifier, pre-programmed PWM, selective harmonic elimination, electromagnetic compatibility, power quality Acknowledgments: The work was supported by the Grant of the President of the Russian Federation for young scientists — candidates of sciences MK-3803.2022.4.