Abstract
Multiphase (more than three) power system has gained popularity due to their inherent advantages when compared to three-phase counterpart. Multiphase power supply is extensively used in AC/DC multi-pulse converters, especially supply with multiple of three-phases. AC/DC converter with multi-pulse input is a popular solution to reduce the ripple in the DC output. Single-phase and three-phase transformers and phase transformation from single to multiphase are employed in variable speed drives application to feed the multi-cell H-Bridge converters and multi-pulse AC-DC converters. Six-phase system is extensively discussed in the literature for numerous applications ranging from variable speed drives to multiphase wind energy generation system. This paper shows the systematic phase transformation technique from three-phase to six-phase (both symmetrical and asymmetrical) for both understanding and teaching purposes. Such an approach could help students understand a promising advanced concept in their undergraduate courses. When phase difference between the two consecutive phases of six phases has a phase difference of 60, it is called a symmetrical six-phase system; while an asymmetrical or quasi, six-phase has two set of three-phase with a phase shift of 30 between the two sets. Simulation and experimental results are also presented.
Highlights
Electric machines (EM) are used in numerous applications and are called the workhorse of industries
The input is connected in delta and Anotheroutputs scheme for quasi six-phase is in byFigure using7b.six single-phase transformers as shown the outputs in star and delta
Multiphase system is increasingly employed in generation, transmission and utilization of electrical energy
Summary
Electric machines (EM) are used in numerous applications and are called the workhorse of industries. Single-phase and three-phase transformers theory is taught and is reinforced with the laboratory exercises [3,4,5] It includes the basic electromechanical energy conversion process and rotating machines concepts. While teaching the course of power electronics at senior level, phase conversion of transformer is needed in order to explain the concept of increasing input pulses to reduce the output ripple in AC/DC converters. There are several techniques available in the literature to obtain high pulse supply such as combining three-phase transformers and using zigzag connection. Since any variable speed high performance drive applications need precise values of the motor parameters, motors are designed to operate for sine waves, in the current practice, inverters are used to feed the motor for testing and getting their parameters.
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