MTPA Control of Double Inverter Fed Wound Rotor Induction Motor Drive
Cheshta Jain, Navneet Vaishnav, Amit Kumar Jain
Abstract
This article presents the Maximum Torque Per Ampere (MTPA) control for the Double-Inverter fed Wound Rotor Induction Machine (DI-WRIM). The MTPA control, in general, is investigated using variable-sweeping and mathematical optimization methods. However, owing to the complexity of the variable sweeping strategy, an MTPA control with the mathematical optimization method is a pressing priority. This article proposes an MTPA control based on the mathematical optimization method for a speed-controlled DI-WRIM. This MTPA control emphasizes the various Regions of Operation (ROPs), described in terms of control variable limitations and system constraints, and covers the wide-speed operation of DI-WRIM, i.e., below the base speed region and the flux weakening region (FWR). The flux weakening is particularly emphasized for DI-WRIM, as it has received little attention in the literature. A thorough graphical representation of the trajectories for various operational variables, e.g., machine voltages and currents in the synchronous <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$d$</tex-math></inline-formula>-<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$q$</tex-math></inline-formula> plane, is also provided for better understanding. The efficacy of the MTPA control and associated analysis are validated on two design configurations of WRIMs, namely, Design-I and Design-II WRIMs, with suitable simulation and experimental results.