S. Nagarajan ¹, N. Rajendran ²

Affiliations
1 Department of Electrical and Electronics Engineering, Jerusalem College of Engineering, Pallikaranai, Chennai – 600100, Tamil Nadu, IN
2 Department of Electrical and Electronics Engineering, Bharath University, Chennai–600073, Tamil Nadu, IN

Abstract

This paper investigates the performance of Trans Z- source inverter (abbreviated as T ZSI) fed induction motor drive under various fault conditions. With development in power electronics and remarkable improvement in control techniques, induction motor has evolved as a variable speed machine. For critical applications, continuous operation of the drive is of paramount importance. However, their performance is restricted by electrical and mechanical faults. When any fault occurs, the phase and line voltages of the inverters get decreased. This leads to reduction of torque and speed of the motor and hence the operation of induction motor is interrupted. This states the importance for fault diagnosis of T Z-Source inverter fed induction motor to analyse the performance of the drive under faulty conditions. The performance of the induction motor under various faults is verified by MATLAB simulation of a 5 Hp induction motor fed by a high performance ZSI and the simulation results are presented. A comparative evaluation of Z-source and T Z-source topologies is done for the same load torque conditions.

Keywords

AC Motor Drives, Fault Diagnosis, T Z-source, Z-source Inverter

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S. Balasubramani ¹, N. Rajendran ²

Affiliations
1 Department of Electrical and Electronics Engineering, Jerusalem College of Engineering, Chennai – 600100, Tamil nadu, IN
2 Department of Electrical and Electronics Engineering, Bharath University, Chennai – 600073, Tamil nadu, IN

Abstract

This paper presents simulation and analysis of twelve pulse rectifier transformer unit configured in series and also in parallel to have higher current capability and reduced harmonics, which creates the current imbalance and hence circulating current can be observed with parallel connection. Balanced current can be achieved with the introduction of Inter Phase Transformer (IPT) while paralleling two six pulse rectifier in rectifier transformer unit. PSCAD is used for performing all the simulations.

Keywords

Circulating Current, Harmonics, Inter Phase Transformer

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N. Rajendran ¹

Affiliations
1 Department of Electrical and Electronics Engineering, Bharath University, Chennai - 600073, Tamil Nadu, IN

Abstract

This paper presents a survey of system studies on electrical machines for variable speed applications. All electrical machines in general are classified based on their unique characteristic features as inductive - interactive type and variable reluctance type machines. In this paper three electrical machines with three different characteristic features are studied and a choice is made as to which machine is best suited for a variable speed application. The subject of System Theory is applied to study the structure of the three machines. Wind energy generation being a typical variable speed application is chosen as the specific application for which the machine is designed. The three machines taken up for study are Induction Machine and Synchronous Machine for inductive - Interactive type and Switched Reluctance Machine for variable reluctance type. Optimization of power generation and increasing the energy efficiency from wind energy by proper choice and design of a machine is the objective of the study.

Keywords

Induction Machines, Switched Reluctance Machines (SRM), Synchronous Machines, Torque Production, Variable Speed Application, Wind Turbine Generator

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