Quarter-Wave Symmetric Space Vector PWM with Low Values of Frequency Modulation Index in Control of Three-Phase Multilev
The paper deals with the three-phase multilevel voltage source inverter (MLVSI) load current quality issue, which is important, in particular, for the MLVSI application to adjustable-speed AC drive. Here the problem of MLVSI control is solved by the use o
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Quarter-Wave Symmetric Space Vector PWM with Low Values of Frequency Modulation Index in Control of Three-Phase Multilevel Voltage Source Inverter Nikolay Lopatkin Abstract The paper deals with the three-phase multilevel voltage source inverter (MLVSI) load current quality issue, which is important, in particular, for the MLVSI application to adjustable-speed AC drive. Here the problem of MLVSI control is solved by the use of the low-frequency space-vector PWM with the quarter-wave symmetric output voltages (QWS-SVPWM), based on the approach operating with the integer and fractional parts of the reference delta voltages relative values. The specified technique has low dynamic losses in power semiconductor switches. QWSSVPWM is applied to control MLVSIs of any arbitrary numbers of the equal levels and any arbitrary topologies. Comparisons of dependences on a modulation depth for the THD and the first three orders’ integrated voltage harmonics factors (IHF) of the simulated MLVSI output voltage waveforms are carried out between the three lowest appropriate values of frequency modulation index. To obtain the most appropriate voltage waveform for the best quality MLVSI load current, the amplitude modulation index ranges for preferable use of each of the three considered frequency modulation index values, under the terms of minimization of the appropriate orders’ IHF values (depending on the particular kind of the load) are revealed.
36.1 Introduction Multilevel voltage source inverters (MLVSI) perfectly fits into the modern trend of renewable energy application both in municipal engineering and in industry [1, 2] due to their specific features, to progress in implementation of high-rated in voltage and current values IGBT power switches and to a wide variety of their circuitry solutions and control techniques [3–7]. The above MLVSI features include the ability N. Lopatkin (B) Shukshin Altai State University for Humanities and Pedagogy, 53, Korolenko Str, 659333 Biysk, Altai Region, Russia e-mail: [email protected] © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021 A. Ronzhin and V. Shishlakov (eds.), Proceedings of 15th International Conference on Electromechanics and Robotics “Zavalishin’s Readings”, Smart Innovation, Systems and Technologies 187, https://doi.org/10.1007/978-981-15-5580-0_36
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to obtain high quality output AC power, the lowered requirements to the individual voltage ratings of power switches and the comparatively low value of the switches commutation frequency leading to the corresponding low level of the switching losses. The modulation strategy is a key factor in the best utilization of the MLVSI full potential [7]. Due to affordability of microcontrollers and FPGAs, the method of the pulse-width modulation (PWM) with the sinusoidal reference and the carrier signals of different levels is now being superseded in engineering practice by the space vector (SV) PWM (SVPWM) of various techniques. The advanta
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