Abstract
In this article, a new structure is used for induction motor drive (IMD). A Δ-polygon configuration based multi-winding transformer is designed in it to get an eighteen pulse AC-DC converter, which fulfill the DC-supply requirement of a 7-level cascaded H-bridge (CHB) inverter. This 7-level CHB-inverter is utilized at the drive end, to drive an induction motor (IM) and it requires less semiconductors switches and DC-supplies than the existing 7-level CHB-inverter. Therefore, a modified multi-winding transformer is designed to fulfil the need of a 7-level CHB-inverter, which also makes the input current closer to sinusoidal and reduces its THD to an acceptable value. A vector control is used to control an IM, which has good performance than v/f control. A new fundamental frequency switching technique (area equalization modulation strategy) is used in this work, to operate a 7-level CHB-inverter at fundamental frequency switching, which reduces the switching losses and increases efficiency of the system. The comparative study is also given to show the effectiveness of the system. Performance of the system is analyzed in MATLAB/Simulink under various operating conditions of IM. The simulated performances are validated from the experimental results captured from the developed laboratory prototype.
Highlights
With technology advancements in semiconductor devices such as insulated gate bipolar transistors (IGBTs), modern high-power medium voltage (MV) drives are increasingly used in petrochemical, mining, steel and metals, transportation and other industries to conserve electric energy, increase productivity and to improve product quality
EFFICIENCY OF medium voltage induction motor drive (MVIMD) The bar-chart diagram of efficiency is depicted in Fig. 9, which represent the comparison of efficiency of an 18-pulse AC-DC converter fed 7-level binary cascaded H-bridge (CHB)-inverter based induction motor drive (IMD) when it is controlled by proposed area equalization modulation strategy (AEMS) and existing phase disposition (PD) sinusoidal pulse width modulation (SPWM) technique with carrier frequency equal to 1500 and 3000 Hz
An eighteen pulse AC-DC conversion has made ‘is’ almost sinusoidal with less THD within adequate limit according to the IEEE-519 standard
Summary
With technology advancements in semiconductor devices such as insulated gate bipolar transistors (IGBTs), modern high-power medium voltage (MV) drives are increasingly used in petrochemical, mining, steel and metals, transportation and other industries to conserve electric energy, increase productivity and to improve product quality. In this work, a binary principle is used to choose the DC voltages By this principle, a 7-level CHB-inverter needs 24 power semiconductor switches and 6-isolated DCsupplies only. This problem can be solved by utilizing fundamental frequency switching (FFS) to control this 7-level CHB-inverter. The calculation of the switching angles corresponding to each modulation index varying from 0 to 1, is not possible It is because, quite complex and time taking methods are utilized to solve the transcendental equations. In the case of NLMT, switching angles calculation is not required as like SHE technique This modulation strategy is more suitable for higher numbers of levels (more than 13-levels). The complete theory and implementation of AEMS for IMD, are given in this study
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