Studying a voltage stabilization algorithm in the cells of a modular six­level inverter

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.185404

Keywords:

modular multilevel inverter, transducer, space-vector modulation algorithm, pulse-width modulation

Abstract

Multi-level autonomous voltage converters are increasingly used in industry, specifically: in wind and solar energy generation, high-voltage substations, in industrial and traction electric drives. In comparison with two-level inverters, multilevel inverters have a series of significant advantages, specifically, greater output power, greater efficiency value, smaller content of higher harmonics at loading and in a power grid. Reducing the content of higher harmonics in the output current of a multilevel inverter directly decreases additional losses at loading and improves the overall value of efficiency.

Our study of a six-level modular inverter has shown that the algorithm of a spatial-vector modulation causes a disbalance in voltage on the capacitors of cells. In this case, voltage in half the cells tends to zero while in the other half of the cells it increases two-fold, which leads to a significant distortion of the output voltage. This paper gives reasons for this instability, as well as presents the improved spatial-vector modulation algorithm of the multilevel converter, which makes it possible to stabilize voltage in cells.

We have proposed an algorithm of voltage stabilization on the cells of a modular multilevel inverter. The voltage stabilization is achieved by a hysteresis regulation with an alternating transition of the spatial-vector pulse-width modulation and inverse vector control system under condition that the voltage deviation on the cell is above or below the predefined permissible level.

The MATLAB 2017b software was used to conduct simulation of the six-level voltage inverter, which confirmed effectiveness of the proposed modulation algorithm

Author Biographies

Oleksandr Plakhtii, LLC «VО ОVЕN» Hvardiytsiv-Shyronivtsiv str., 3A, Kharkiv, Ukraine, 61153

PhD, Electronic Engineer

Volodymyr Nerubatskyi, Ukrainian State University of Railway Transport Feierbakha sq., 7, Kharkiv, Ukraine, 61050

PhD, Associate Professor

Department of Electric Power Engineering, Electrical Engineering and Electromechanics

Nadiia Karpenko, Ukrainian State University of Railway Transport Feierbakha sq., 7, Kharkiv, Ukraine, 61050

PhD, Associate Professor

Department of Electric Power Engineering, Electrical Engineering and Electromechanics

Olha Ananieva, Ukrainian State University of Railway Transport Feierbakha sq., 7, Kharkiv, Ukraine, 61050

Doctor of Technical Sciences, Associate Professor

Department of Automation and Computer Telecontrol Train Traffic

Hryhorii Khoruzhevskyi, LLC «VО ОVЕN» Hvardiytsiv-Shyronivtsiv str., 3A, Kharkiv, Ukraine, 61153

Сonstructor Engineer

Vitaliy Kavun, Ukrainian State University of Railway Transport Feierbakha sq., 7, Kharkiv, Ukraine, 61050

Postgraduate Student

Department of Electric Power Engineering, Electrical Engineering and Electromechanics

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Published

2019-12-02

How to Cite

Plakhtii, O., Nerubatskyi, V., Karpenko, N., Ananieva, O., Khoruzhevskyi, H., & Kavun, V. (2019). Studying a voltage stabilization algorithm in the cells of a modular six­level inverter. Eastern-European Journal of Enterprise Technologies, 6(8 (102), 19–27. https://doi.org/10.15587/1729-4061.2019.185404

Issue

Vol. 6 No. 8 (102) (2019): Energy-saving technologies and equipment

Section

Energy-saving technologies and equipment

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Copyright (c) 2019 Oleksandr Plakhtii, Volodymyr Nerubatskyi, Nadiia Karpenko, Olha Ananieva, Hryhorii Khoruzhevskyi, Vitaliy Kavun

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