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

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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)
Realisation period:
unknown - unknown
Project manager:
Dmytro Kondratenko
Realised in:
Department of Controlled Electric Drives
Request type:
National Research Programmes
Domestic:
Domestic project
Verified by:
Gdańsk University of Technology

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