This paper deals with a 36-pulse AC-DC converter fed 5-level cascaded H-bridge multilevel inverter (CHB-MLI) based induction motor drive (IMD). A new configuration of a multi winding transformer (MWT) is designed for a 36-pulse AC-DC converter at the utility end. The existing MWT for a 36-pulse AC-DC converter requires phase-shift in both primary and secondary windings. Whereas, this MWT does not require any phase-shift on the secondary side and it only requires phase-shift in primary windings. Therefore, this MWT needs less numbers of isolated winding than existing MWT. Because of it, the design and manufacturing of this MWT, are quite easy than the existing MWT. Apart from it, a modified PWM technique is used to operate a 5-level CHB-MLI in such a way that, this MLI has less power losses than the existing 5-level CHB-MLI. Therefore, this IMD has enhanced efficiency than an existing IMD. This system configuration performance is validated by simulating it in MATLAB/Simulink environment during various operating conditions of IMD.

Modified PWM Technique for a Multi-Pulse Converter fed Multilevel Inverter Based IM Drive

This study presents a performance evaluation of a high power induction motor drive, which is operated by a 13-level cascaded H-bridge multilevel inverter (CHB-MLI) and a 54-pulse AC-DC converter. The higher number of voltage levels to adhere the power quality standard IEEE 519 at drive end and less- number of power switches are feasible due to asymmetric DC supplies, having 1:2:3 voltage ratio. A Nearest level control switching technique is presented to minimize the pole voltage transitions for CHB-MLI, thereby diminishing the switching losses of the high power converter. A 54-pulse rectification system is presented to adhere the power quality standard IEEE519 at utility end. Simulation results demonstrate the performance of a 30kW induction motor drive in steady and dynamic states. A sensitivity study is conducted in the experimental setup with 7.5kW(10hp) to evaluate the steady and dynamic state performances of this drive system. A comprehensive study shows a superior power quality performance both at grid and drive end of the system.

Adjustable Speed Induction Motor drive fed by 13-level Cascaded Inverter and 54-Pulse Converter

https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/iet-pel.2020.0473

A multilevel inverter using switched capacitors with reduced components

Here, 18-pulse rectification system is presented to supply clean power to medium voltage drives used in applications such as oil and gas production. High pulse rectification systems are demanded by industry to satisfy international power quality standards like the IEEE-519. A cascaded multilevel inverter is used here, which is cascading three –phase voltage source inverter (VSI) in unique manner. The presented four –level inverter has three 2-level VSI in cascaded arrangement. This induction motor drive (IMD) system is compact in size as it requires less number DC voltage sources, thus making it reliable. A Simulink model is built to analysis the performance of an indirect field-oriented control (IFOC) technique based 30kW IMD. Therefore, to validate the Simulink result a 7.5kW induction motor (IM) experimental setup control by a DSP (dSPACE DS1006) controller. A comprehensive study shows a superior power quality performance both at grid and drive end of the system.

An 18-Pulse Converter and 4-Level Cascaded Inverter Based Induction Motor Drive

This paper presents the Genetic Algorithm-Selective Harmonic Elimination (GA-SHE) technique to suppress lower order harmonic in 7-level binary cascaded H-bridge multilevel inverter (CHB-MLI). Genetic Algorithm (GA) based selective harmonic elimination (SHE) technique is utilized to govern the optimal switching angles of 7-level binary CHB-MLI. The optimized switching angles calculated offline are utilized to improve the drive end power quality of a 36-pulse AC-DC converter fed 7-level binary CHB-MLI based indirect field-oriented control (IFOC) for induction motor drive (IMD) system. A low-frequency fundamental switching technique is employed to reduce the switching losses in a high-power converter for a medium voltage induction motor drive application. A multi-winding transformer (MWT) fed 36-pulse AC-DC converter configuration is utilized to improve the power quality at the grid end. The performance of the system is analyzed at various operating conditions through simulated result. A DSP (dSPACE DS-1006) controller based 7.5kW IMD prototype is utilized to validate the simulated results.

Harmonic Suppression Scheme for Multi-Pulse Converter Fed Multilevel Inverter Based IM Drive

Renewable energy sources such as fuel cell, solar, Magneto hydro Dynamic (MHD), geothermal are the best alternatives to solve the problem of environmental issue and increasing demand of energy. The output of these resources is dc, therefore to connect these resources to the grid, multilevel inverter is the key device. But the output of multilevel inverter has power quality issues such as harmonic generation and notching due to conversion of dc to ac and high number of switch. Hence, this paper deals with harmonic elimination using Genetic Algorithm based Selective Harmonic Elimination (GA-SHE) techniques for asymmetric and symmetric topology of MLI. In the present study, comparative study among various multilevel inverters with reduced number of switches topologies has been discussed. A novel topology of single phase 15-level inverter which consists least number of switches has been designed for a desired voltage level. Also, the comparison of Total harmonic distortion(THD) developed in the proposed 15-level inverter with output voltage generated by different topology at different levels are discussed. The output of proposed topology contains THD (<5%) as per IEEE 519 standard.

A Novel Topology of Fifteen Level Multilevel Inverter with Harmonic Elimination Using GASHE

The demand of quality power is increasing continuously. The problem of global warming and rate of decrease of non-renewable energy sources are increasing day by day. Hence renewable energy sources such as fuel cell, solar, Magneto hydro Dynamic (MHD), geothermal are the best alternatives to solve the problem of environmental issue and increasing demand of energy.  The output of these resources is dc, therefore to connect these resources to the grid, multilevel inverter is the key device. But the output of multilevel inverter has power quality issues such as harmonic generation and notching due to conversion of dc to ac and high number of switch. Hence, this paper deals with harmonic elimination using Genetic Algorithm based Selective Harmonic Elimination (GA-SHE) techniques for asymmetric and symmetric topology of MLI. In the present study, comparative study among the 5-level, 7-level, 9-level, 11-level and 15-level multilevel inverters with reduced number of switches topologies has been discussed. A novel topology of 15-level inverter which consists least number of switches has been designed for a desired voltage level. Also, the comparison of Total harmonic distortion developed in the output voltage generated by different topology at different levels with the proposed 15-level inverter topology are discussed. 

/pdf/modelling-and-analysis-of-novel-topology-for-multilevel-2334o50rdy.pdf

Shivendra Kaura

Papers

A Novel Topology of Fifteen Level Multilevel Inverter with Harmonic Elimination Using GASHE

Modelling and Analysis of Novel Topology for Multilevel Inverter With Reduce Number of Switches