Publications by Roland Wetter | EPFL Graph Search

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The present paper investigates transient overvoltages on ac induction motors when connected through a cable of arbitrary length to IGBT-PWM inverters. Considering classical transmission line analysis, and traveling-wave analysis with zero initial charges o ...

The Laboratory of Electrical Machines of the Swiss Federal Institute of Technology (Lausanne) has developed a software (TLSim) for the simulation of electrical urban transportation systems. This program can simulate the behaviour of the power supply network (current and voltage level at any point of the topology) comprising uni- and bi- directionnal sub-stations. In the network the vehicules (trolleybus) may run along any defined path through different electrical supply sectors. Several models of trolleybus

The present paper addresses the use of a Windows™ DLL to simulate the real code of a DSP for faster development time and advanced testing, especially in high power systems. The development of power system control usually starts with simulations and the development of the control is done with the simulation tool native blocs. Once the control is validated in simulation it is usually C coded into a DSP and real test can be performed. The present paper introduces a way of simulating the real DSP code to fill t

The current source thyristor inverter is still today a suitable choice for supplying high power adjustable speed drives for pumps or compressors. This paper presents a 12-pulse LCI (load commutated inverter) synchronous drive for a 20 MW compressor, it focuses on the following main aspects: modeling of the complete drive system, numerical simulation and comparison between calculated and measured values of the pulsating torque components in steady-state operations. The modeling of the six- phase synchronous

This paper describes a novel and patented air-gap monitoring system for large low speed synchronous hydro-generators. This new system is based on inductive sensors, it is able to measure in real time a static or a dynamic rotor eccentricity, a stator or a ...

Large low speed hydro-generators (Fig. 1) have a very small specific air-gap to stator bore diameter ratio making it virtually impossible to have a perfect centering of the rotor within the stator during the assembly process. Therefore the machines are ope ...

The LCI (Load commutated Inverter) is still today a suitable solution for supplying high power variable speed drive systems. The following main topics are described in this contribution: The modeling of a 20 MW LCI synchronous drive system for a compressio ...

The present paper deals with the determination of voltage stresses on PWM inverter fed induction motors by considering first the cable modeling and the measurement of different parameters. Then, based on this model, voltage stresses on the motor windings are determined precisely by an analytical approach, which takes into account the motor windings, and the filters. Different aspects related to such installations will be briefly described and discussed. hes will be discussed.

This paper presents a refined approach to obtain the parameters of synchronous machine equivalent circuits from standstill DC decay tests. A dedicated program for the time- constants and reactances identification was developed and applied for both d- and q ...

Roland Wetter

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Investigation of transient overvoltages of low voltage induction motors due to IGBT-Inverter supply

TLSim: A software for Electrical Public Transportation Systems

Simulating real DSP code using a DLL, application to a 3-level VSI SVC

12-Pulse LCI synchronous drive for a 20 MW compressor : modeling, simulation and measurements

A Novel Air-Gap Monitoring System For Large Low Speed Hydro-Generators

12-Pulse LCI Synchronous Drive for a 20 MW Compressor - Modeling, Simulation and Measurements

An innovative Inductive Air-Gap Monitoring System for Large Low Speed Hydro-Generators

20 MW Compressor LCI Drive: Modeling, Simulation and Measurements

Voltage stresses on PWM inverter fed induction motors : cable modeling and measurement.

An Original Inductive Air-Gap Monitoring System for Large Low Speed Hydro-Generators

On the Identification of the Synchronous Machine Parameters Using Standstill DC Decay Test

A New Inductive Air-Gap Monitoring System for Large Low Speed Hydro-Generators, Tests in Operation