A universal algorithm of space vector pulse width modulation for three-level three- and multi-phase NPC inverters with DC-link voltage balancing

The project concerns the development of the universal space-vector pulse width modulation algorithm of multi-phase drive supplied by three-level Neutral Point Clamping Voltage Source Inverters (NPC VSIs) with DC-link voltage balancing. Nowadays, the three-phase motors supplied by three-phase voltage source inverters are mainly used in drive systems. Along with this growing interest among scientists and engineers are multiphase systems. It is the properties of multi-phase motors that make these motors an interesting alternative to three-phase motors. The properties of multi-phase motors make these machines an interesting alternative to three-phase motors. In five-phase induction motors, the nominal torque can be enhanced by up to 15% by injection the third harmonic into the motor current. It is also possible to control independently several motors supplied by a single inverter. This approach, however, requires the utilizing of complex modulation methods. These modulation algorithms use m to the n-th power space vectors, where m-number of levels and n-number of phases of the inverter, so for a three-level, five-phase inverter, the modulation algorithm deals with 243 vectors. The multiphase motors are also more reliable than their three-phase counterparts. They allow generating the torque also in the case of the failed phase. The research will be carried out using the three-level five-phase neutral point clamped (NPC) inverters. The three-level (but three-phase) NPC inverters are commonly used in industrial applications. They can be used in medium voltage applications, where give the ability to generate the output voltages higher than the blocking voltage of semiconductors. In low voltage applications, the NPC inverters can replace commonly used two-level inverters. The NPC inverters can be built of cheaper transistors with a lower blocking voltage. The main problem to be solved in VSIs with more than 2 levels is the requirement to maintain (preferably) the same DC link voltages and correct generation of output voltages when the DC-link voltages are not identical. The developed SVPWM will be able to be used in both applications: to supply a single multi-phase motor with increased electromagnetic torque, as well as to supply (n-1)/2 (n is an odd number) motors supplied by a single inverter. Proposed solution will be developed taking into account the necessity to balance the DC-link voltages.

Details

Financial Program Name:: PRELUDIUM
Organization:: Narodowe Centrum Nauki (NCN) (National Science Centre)
Agreement:: UMO-2021/41/N/ST7/01968 z dnia 2021-11-26
Realisation period:: 2022-01-01 - 2022-12-31
Project manager:: dr inż. Dmytro Kondratenko
Realised in:: Department of Electric Drives and Energy Conversion
Request type:: National Research Programmes
Domestic:: Domestic project
Verified by:: Gdańsk University of Technology

Papers associated with that project

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total: 6

Year 2024

Dead time effects compensation strategy by third harmonic injection for a five-phase inverter
Publication
- Archives of Electrical Engineering - Year 2024
This paper proposes a method for compensation of dead-time effects for a fivephase inverter. In the proposed method an additional control subsystem was added to the field-oriented control (FOC) scheme in the coordinate system mapped to the third harmonic. The additional control loop operates in the fixed, orthogonal reference frame ( α - β coordinates) without the need for additional Park transformations. The purpose of this method...

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Hybridized PWM Strategy for Three- and Multiphase Three-Level NPC Inverters
Publication
- A. Lewicki
- D. Kondratenko
- C. Odeh
- IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS - Year 2024
A simple hybridized pulsewidth modulation (PWM) algorithm for three- and multiphase three-level neutral point clamped (NPC) inverters is proposed. The proposed solution is based on classical space vector PWM (SVPWM) algorithms for two-level inverters but can also be based on sinusoidal PWM with min–max injection. An additional level of output voltage is obtained by modifying the resulting switching patterns taking into account...

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Year 2023

A Simplified SVPWM Technique for Five-leg Inverter with Dual Three-phase Output
Publication
- D. Kondratenko
- A. Lewicki
- Year 2023
This article proposes a simplified space vector pulse-width modulation (SVPWM) technique five-leg inverter with dual three-phase output. An idea to fed the dual tree-phase machine by the multiphase voltage source inverters (VSIs) is not new. Dual- and multi-motor drive systems are widely used in the industry applications. The most popular fields are: electric vehicles (EVs) and traction systems. Moreover, the specific characteristic...

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Augmented speed control scheme of dual induction motors with mutual flux angle control loop
Publication
- Archives of Electrical Engineering - Year 2023
This paper proposes an augmented speed control scheme of dual induction motors fed by a five-leg voltage source inverter (VSI) with a common/shared-leg. An additional control loop is proposed here and based on the mutual flux angle – the difference between flux angular positions of the IMs. The main purpose of this research is to minimize the energy losses in the common inverter leg by controlling the mutual flux angle, at equal...

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Increasing the Utilization of dc-link Voltage of a Five-Leg VSI Based on Rotor Angle Control of Dual Induction Motors
Publication
- Year 2023
This paper introduces an increased utilization of the dc-link voltage of a five-leg voltage source inverter (VSI) based on the rotor flux angle control technique for dual induction motors, IM. The main purpose is to utilize additional abilities provided by a multi-motor drive system in limited operating conditions. Generally, a multi-motor drive system is widely used in electric vehicles (EVs), traction systems and in several industrial...

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Year 2022

Single-phase, Five-level Inverter with SPWM-Based Neutral Point Voltage Balancing Scheme
Publication
- Year 2022
Multilevel inverter topologies provide several advantages over two-level inverter configuration. These benefits are the reason for the growing interest in multilevel topologies among research society. One of the most popular topological concepts (diode and active switch clamping) requires neutral-point potential balancing due to series-connected capacitor banks across the input dc link in such derived inverter configurations. This...

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