Girish Nanjundaiah

Publication date : Dec 2010
Paper File : India Conference 2011_LAG_final.pdf

Authors

Luc-André Gregoire, Laurence A. Snider, Jean Bélanger, Girish Nanjundaiah,

Abstract

This paper describes today's power system simulation challenge. Simulator technology has evolved from physical/analogue simulators (HVDC simulators, TNA’s) for electromagnetic transients and protection and control studies, to hybrid TNA/Analogue/Digital simulators with the capability of studying electro-mechanical transient behaviour [1], to fully digital real-time simulators. Today’s global power system infrastructure is rapidly changing towards increasingly distributed generation/distribution systems, and this transformation mandates expanded use of power electronic devices: HVDC, FACTS and interfacing devices for dc and variable-frequency power sources (photovoltaic, wind generation).

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Publication date : Jan 2011
Paper File : IICPE2010-HIL_multilevel_rectifier.pdf

Authors

Luc-André Gregoire, Kamal Al-Haddad, Girish Nanjundaiah,

Abstract

This paper proposes a validation methodology for implementing solutions to challenges involved with power electronic converter design. Typically, the design process consists of first simulating the converter and then implementing it on hardware. Here, an intermediate step is added where the controller is connected to a real-time simulator before being connected to real hardware. This allows for virtual testing of scenarios that cannot be conducted with physical hardware without risking damage to the hardware. This technique will be demonstrated by implementing a new method of control, the drifting PWM, for a multilevel packed U-cell (PUC) converter. The drifting PWM allows for a slight variation in the switching state so that regulation of the auxiliary capacitor can be achieved. This method will be simulated offline and in real-time to demonstrate its long term reliability. Once fully functional, the controller is implemented on an FPGA board, from which it will control the real converter. Simulation results, as well as experimental results, are presented and compared. It is demonstrated that the HIL technique is a very effective tool for designing multilevel converter controllers.

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Publication date : Dec 2005
Paper File : npec2005_opalrt_paper.pdf

Authors

Simon Abourida, Jean Bélanger, Girish Nanjundaiah, Christian Dufour,

Abstract

This paper presents the RT-LAB Electrical Drive Simulator technology along with practical applications. The RT-LAB simulation software enables the parallel simulation of an electrical circuit on clusters of PC running QNX or RT-Linux operating systems at sample time below 10 µs. Using standard Simulink models including SimPowerSystems models, RT-LAB build computation and communication tasks necessary to effectively make parallel simulation of electrical systems with low cost off-the-shelf PC technology. To accommodate the high bandwidth of electrical systems, the RT-LAB Electrical Drive Simulator comes with special Simulink-based modeling tools, namely ARTEMIS and RT-EVENTS that permits real-time simulation of electrical systems at practical time step of 10 µs but with sub-µs equivalent precision through the use of interpolation techniques.

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