Venkata Dinavahi

Publication date : Nov 2009
Paper File : Permanance-Network-Based-RT-Induction-Machine-Model.pdf

Authors

Babak Asghari, Venkata Dinavahi,

Abstract

In this paper a real-time permeance network based distributed model for induction machines is proposed which can accommodate the local phenomena such as slotting and space harmonics inside a machine. A linear permeance network model (PNM) of a squirrel cage induction motor is successfully simulated in real-time by optimizing the numerical procedures inside the model. Particular attention is paid to the selection of an efficient linear solver for the model. Also, the moving band technique which is already used in the finite element analysis of electrical machines is extended to the PNM to reduce the domain of study to one quarter of the machine. Real-time oscilloscope results of the simulation of an induction machine during the start up, no load and loaded operating conditions are shown in the paper. The real-time simulation results are validated by comparing the effect of rotor slot harmonics in the frequency spectrum of the steady-state stator current with analytical formulas. In order to investigate the effect of saturation on the performance of the machine, a comparison between the simulation results from the real-time linear PNM and offline nonlinear PNM is also presented in the paper.

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RT-LAB Professional_en

Publication date : Apr 2006
Paper File : 3_A_Versatile_Cluster-based_Real-Time_Digital_Simulator_for_Power_Engineering_Research.pdf

Authors

Xin Nie, Venkata Dinavahi, Omar Faruque, Lok-Fu Pak,

Abstract

This paper presents the development of a unique parallel and distributed real-time digital simulator for power engineering research at the University of Alberta. The simulator is built entirely from commodity-off-the-shelf (COTS) hardware and software components, making it very flexible and scalable. In parallel multi-tasking operations, a combination of real-time Linux operating system and an ultra-fast network forms the backbone for the internal communication between the 16 powerful processors of the Xeon-Cluster. Field programmable gate array (FPGA)-based multi-channel digital and analog I/O ports are interfaced to communicate with the external hardware components. The model development software utilized for power applications is based on the highly customizable industry-standard MATLAB/SIMULINK environment. A detailed case study of the real-time simulation of a three-level 12-pulse vector-controlled ac drive is presented to illustrate the precision capabilities of the simulator. Multiple integration algorithms and multirate computation have been applied for the simulation of the system, with slow (machine) and fast (converter) dynamic components. Real-time simulation of the entire system has been achieved with a maximum computation time of 5.35 s on a step-size of 10 s for the first time. Results obtained from the real-time simulation have been validated with an offline simulation using PSCAD/EMTDC.

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