Multiobjective Optimal Design of Three-Phase Induction Motor for Traction Systems using an Asymmetrical Cascaded Multilevel Inverter

Select Volume / Issue:

• Volume 2,Issue 1, Jan. 2014

Year:

2014

Type of Publication:

Article

Keywords:

Multilevel Inverter, Electric Traction, Multiobjective Optimization, PWM, THD, Induction Motors

Authors:

Soumya Ranjan; Sudhansu Kumar Mishra; Subhendu Behera; Sachidananda Dehuri

Journal:

IJISM

Volume:

2

Number:

1

Pages:

119-125

Month:

January

Abstract:

This paper presents the multiobjective optimal design of induction motor using a cascaded asymmetrical multilevel inverter in the railway traction drive. The problem of optimization of induction motor design is tackled as a nonlinear programming problem. Here, the Pareto-optimal (non-inferior) solutions are found from which the “best” is chosen based on the designer’s preferences. The objective function or the cost function is formed by taking the power density, efficiency and material cost into account. The design of three phase squirrel cage induction motor (SCIM) in which efficiency is maximized and the power density as well as material cost is minimized. Moreover, it also shows the total harmonic distortion (THD) reduces with the increase in the voltage level. Various modulation techniques such as Phase Shifted Modulation (PSM), Level Shifted Modulation (LSM) and Selective Harmonic Elimination Techniques (SHE) were implemented in order to find the best modulation techniques among them. Also it is shown that SHE technique results in low THD. Thus, an IGBT based cascaded five level asymmetrical inverters with SHE method has been modelled to lower the supply voltage to a level convenient for the traction induction motors. Analysis and synthesis programs needed for the problem have also been developed. To verify its validity, the method is applied to a three phase squirrel cage induction motor (SCIM).

Full text: IJISM_45_Final.pdf [Bibtex]