N. Hingorani - Academia.edu (original) (raw)

Papers by N. Hingorani

Under some circumstances, the earth itself serves as an electrical conductor. A dc transmission s... more Under some circumstances, the earth itself serves as an electrical conductor. A dc transmission system may operate at more than 50% load with one of its two conductors out of service, using the earth as a return path. But that underground current can have side effects on gas or oil pipelines that lie within a few miles of the system electrodes. Pipelines can act as conductors for the current returning via the earth, and when current exits a pipeline, it can, with repeated occurrences, cause disbonding of the metal (corrosion). Operation of a system using earth as the return path, therefore, should be minimal. And a way has been found to accomplish this - the metallic-return mode. Most instances of dc lines forced to operate in the earth-return mode are caused when terminal equipment is out of service or when one conductor sustains partial damage to its insulation. In these cases, the unserviceable line can substitute for the earth as a path for return current, thus avoiding potentia...

IEEE Electric Ship Technologies Symposium, 2009

Real-time simulations of modern power electronic systems require very short frame times of the or... more Real-time simulations of modern power electronic systems require very short frame times of the order of a few microseconds or less. Recent research has developed techniques using digital signal processors or field-programmable gate arrays to meet this need. Integrating these high-speed simulations in a complete power system simulation often requires multi-rate simulation techniques and integration of the high-speed platforms with

2010 IEEE International Symposium on Industrial Electronics, 2010

High power electronics has an increasing scope and important role to play for enabling renewable ... more High power electronics has an increasing scope and important role to play for enabling renewable generation, efficiency improvement, electric energy storage. Scope of these applications is a function of cost, losses, weight and size of power electronics, and this paper describes Power Electronics Building Block (PEBB) concept, as an strategy for achieving these objectives. This paper also describes IEEE activity on PEBB concept.

International Journal of Electrical Engineering Education

The problem of developing real-time simulations that include both high-speed (<10 μS frame tim... more The problem of developing real-time simulations that include both high-speed (<10 μS frame time) and slower components can be alleviated using multi-rate simulation. Collaboration between California State University, Chico; the University of South Carolina; and the University of Glasgow, aims to develop a multi-rate demonstration example that includes a power electronic subsystem requiring high-speed simulation. The selected application is an unmanned underwater vehicle (UUV) that uses a battery as its energy source feeding an a.c. motor drive through a d.c. to a.c. converter. The drive powers the vessel which is modeled as a 6-degree of freedom platform with control surfaces. The model separates the system into subsystems that are simulated with different frame rates: the converter (fast), its controller (fast medium) the motor drive (slow medium), and the vessel and the battery (slow). The initial effort aims to combine the subsystems within a VTB environment using a new VTB mu...

Proceedings of The Institution of Electrical Engineers, 1965

2011 IEEE Electric Ship Technologies Symposium, 2011

Modern power-electronic systems need real-time simulations with short frame times to minimize swi... more Modern power-electronic systems need real-time simulations with short frame times to minimize switch-timing errors. At ESTS&amp;#x27;09 we reported using FPGAs to achieve frame times as low as 400nS. We also described a non-real-time implementation of a multi-rate benchmark of an unmanned underwater vehicle. Recent research has resulted in a real-time implementation of the UUV benchmark with hardware in the loop

2009 11th International Conference on Computer Modelling and Simulation, 2009

Multi-rate simulation techniques offer advantages to the computer simulation of large scale dynam... more Multi-rate simulation techniques offer advantages to the computer simulation of large scale dynamic systems. Each part of the system is solved using the most appropriate time step and numerical integration method. The approach can be particularly advantageous in real-time applications, where it is essential to complete each set of calculations in the allotted real-time interval. The ESL simulation language has

Petroleum and Chemical Industry, Industrial Applications Society Annual Conference, 2010

Most marine applications, from ships to drilling platforms, are increasingly using power electron... more Most marine applications, from ships to drilling platforms, are increasingly using power electronics for motor drives and HVDC power conversion for shore to platform transmission. IEEE Working group i8 is well along in developing a standard for control/protection architecture for power electronics converters. In this digital age control/protection technology is advancing rapidly and substantial improvements can be attained through cost

3rd IET International Conference on Power Electronics, Machines and Drives (PEMD 2006), 2006

... Dr. Yuri Khersonsky received an ... He joined American Superconductor in December 2000 as Dir... more ... Dr. Yuri Khersonsky received an ... He joined American Superconductor in December 2000 as Director of Sales and Marketing of the company's Power Electronics Business Unit and is responsible for the development, marketing, and distribution of the company's power electronic ...

SIMULATION, 2008

ABSTRACT Real-time simulators have been used as an aid to power system design for many years. Ove... more ABSTRACT Real-time simulators have been used as an aid to power system design for many years. Over time, scaled-down physical models and analog computer-based simulators have given way to real-time simulators based on digital technology. Another trend has been the need for shorter and shorter frame times for these digital real-time simulators. Modern power electronic systems use highfrequency Pulse-Width Modulated (PWM) controllers. Indications are that frame times of 2 μS are needed for PWM switching frequencies of 10 KHz. As frequencies increase further it is possible that frame times of less than 1 μS may be required.

Proceedings of the Institution of Electrical Engineers, 1968

Electric Ship Technologies identified by the IEEE Technical Activities Board (TAB) as one of the ... more Electric Ship Technologies identified by the IEEE Technical Activities Board (TAB) as one of the 10 emerging technological challenges that cut across the fields of multiple IEEE societies as well as engineering societies outside IEEE. The goal of this integrated initiative is to enhance technological advances utilization for all related applications by combining advanced research & development accomplishments in universities and research laboratories with well established engineering practices and industrial standards. As implementation of this initiative; the bi-annual Electric Ship Technologies Symposium was established as the permanent forum to bring together the knowledge of the entire scientific and technical community working in the field .for the exchange of broad spectrum of view points (end users, designers, manufacturers, etc,)

Proceedings of the eighteenth workshop on Parallel and distributed simulation - PADS '04, 2004

Real-time simulation is a familiar technique for testing hardware and software in the loop and fo... more Real-time simulation is a familiar technique for testing hardware and software in the loop and for operator training. An important parameter of these simulations is the frame-time necessary to capture the dynamics of the system being simulated. Modern power electronic systems, using higher frequency pulse-width modulation (PWM) converter control demand frame times that are significantly shorter than those found in

2007 IEEE Electric Ship Technologies Symposium, 2007

The power and propulsion system for an electric ship is a complex combination of electrical, mech... more The power and propulsion system for an electric ship is a complex combination of electrical, mechanical, thermal and fluid dynamic components. Effective analysis of its behavior requires detailed computer simulations. Simulations of the complete system can be computationally very demanding, and execution times can be particularly problematical when multi-run optimization studies or real-time simulations are required. One approach to reducing

Development of power electronics - solid-state technology for the efficient handling of bulk elec... more Development of power electronics - solid-state technology for the efficient handling of bulk electric power - stands at the point where integrated circuits did 30 years ago. Like their microelectronic counterparts, power electronics devices are expected to have a revolutionary effect, changing the way that electricity is generated, delivered, and used. The power electronics revolution is discussed.

IEEE Transactions on Power Systems, 2000

The NGH Subsynchronous Resonance (SSR) Damping Scheme designed to damp subsynchronous currents in... more The NGH Subsynchronous Resonance (SSR) Damping Scheme designed to damp subsynchronous currents in transmission lines and to protect generating machines from SSR was installed at Southern California Edison&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;s Lugo Substation in June, 1984. The NGH Scheme has been in Operation for about two years and has been operating satisfactorily. The paper describes the NGH Scheme installation and its operating experience

IEEE Transactions on Industry Applications, 2000

Abstract Tomorrow's marine electrical systems will be profoundly different from today's... more Abstract Tomorrow's marine electrical systems will be profoundly different from today's systems. Power electronics is making major impacts on virtually every marine system including propulsion, power distribution, auxiliaries, sonar, and radar. Newly emerging ...