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Functioning the hydroelectric pumped storage power plant in condenser regime for network stabilization is a common practice. During this operation, hydroelectric machines (doubly fed synchronous machine and doubly fed asynchronous machine) are influenced by various power quality perturbations causing failure to the system. This paper investigates the electro-thermomechanical effects on hydroelectric...
When an internal fault occurs in the wave-connected windings of salient-pole synchronous generators, the symmetry between the parallel windings is broken, and different currents flow in them since unsymmetrical magnetic linkage exists between the stator windings. The aim of this article is to present a model to investigate the internal fault currents in large hydro generators with wave windings. This...
Rotor earth fault protection is used to detect earth faults in the excitation circuit of synchronous machines, ping pong type and injecting-step-voltage rotor earth fault protection are both used in Three Gorges Hydropower Plant. This article analyzes both the principle and application of the two types of protections, together with the operation on giant generating set, advantages and disadvantages...
Externally excited synchronous machines exceptionally suit the needs of axle drives in automotive applications due to their high efficiency over the whole operation range and the advantages for the realization of the functional safety. With the rotor current giving an additional degree of freedom new possibilities and necessities come up, bearing special challenges regarding the control. A loss minimum...
The paper deals with the fault tolerant analysis of several permanent magnet synchronous machines (PMSM) used in hybrid automobiles. There will be treated 3 distinctive elements: the electrical traction, the starter/generator and the steering system. By means of numerical analysis and through experiments, three different types of PMSM and their drives will be verified, while the fault tolerant concept...
In this paper a simple dynamic circuit-based model for a rotor surface mounted PMSM with inter-turn winding short-circuit fault is presented. Finite element analysis is used for parameter determination and study the PMSM under fault conditions. The Analytical expressions are proposed for determining the fault model parameters. The proposed circuit model and parameter expressions are validated by time...
The overexcitation limit of synchronous generator plays an important role in the voltage stability of power systems. Achieving maximum use of the overexcitation capability requires adequate coordination between generator control and protection. This paper provides an example of coordination between overexcitation limiter (OEL), field overcurrent protection and automatic voltage regulator (AVR) for...
The effects of magnet faults on the rotor of permanent magnet synchronous machines are analyzed in the present work. In particular, demagnetization effects are analyzed using the finite element method. Two different stator winding configurations are considered in the analysis, series and parallel connected windings. From this analysis, a fault detection strategy based on the information contained...
This paper widens the knowledge about the microgeneration transient response under faulted conditions. The paper provides the following significant contributions: Firstly, a range of microgeneration transient models have been developed in PSCAD/EMTDC and tested on a typical distribution network. Two types of technologies are considered: a small diesel engine driving a three-phase synchronous machine...
Permanent magnet (PM) synchronous machines are becoming increasingly popular for a wide range of applications. This is mainly due to the significant advantages they provide in terms of power density and efficiency. One of the key challenges of using PM machines is fault-tolerance issue as the machine cannot be simply de-excited. This becomes even more important in safety-critical applications. The...
In the last decade, the field of Fault Detection and Diagnosis in the electric motor manufacturing industry, are becoming more important. The methods used to study the fault detection and diagnoses are based on an explicit mathematical model of the system under test. This article presents, in detail, a method for the study and the simulation of a symmetrical short-circuit of a synchronous machine...
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