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The unbalanced magnetic forces which act upon the rotor of a salient-pole synchronous generator due to eccentric motion of the rotor shaft in the presence of magnetic field originating from the field current in no-load operation have been calculated using finite-element method. The displacement of the rotor has been modeled using the actual shaft orbit recorded on a 5 MVA salient-pole generator driven...
This paper addresses the usage of digital temperature sensors in rotor temperature measurement. A rotor temperature measurement system had to be developed because of the complete synchronous machine thermal analysis. Rotor temperatures are measured using multiple DS18B20 digital thermometers and sent via a wireless link to the host. The measurement system has been mounted on a 400 kVA synchronous...
In the future, distributed generation (DG) needs to be enabled to actively participate in control of grid voltage and frequency. An efficient grid integration strategy is required to interconnect the DG to conventional power systems and to improve the power quality and reliability (PQR) as well. The main task of the interconnected system is to control and maintain frequency and voltage of the power...
After 40 years, the laboratory of electric machines and drives had to be rebuilt. So it has been decided to do it from scratch. Therefore some other issues had to be taken into consideration. This paper will present approach to laboratory design regarding didactics, methodology and praxis.
The paper investigates the performance of variable speed wind turbine (VSWT) configuration with DC-DC converter under restricted output power conditions. The considered regimes of turbine operation are: at maximum available aerodynamic power and at limited output electric power. The wind turbine system consist of synchronous generator (SG) connected to diode rectifier, DC chopper and load. Two different...
Different current source converter topologies for permanent magnet synchronous generator (PMSG) wind turbine applications are presented and analyzed in the paper. In high-power and medium-voltage range, current source converter has its natural advantages, such as simple topology, compact size, high power capability, excellent short circuit protection, and flexible power flow control. However, it also...
This paper presents the possibilities of using switched mode rectification for the doubly fed induction generator system for wind power generation. Doubly fed induction generator requires the frequency converter system for the secondary side excitation. This paper shows that the small capacitance capacitor can reduce the harmonics at ac side, and increase the power factor without PWM control. Avoiding...
The paper describes the methodology, test rig and results of vacuum gauge tests under rotational conditions. The gauge is dedicated to measurements of vacuum in the rotor of an HTS power generator. The tests were performed using a dedicated test rig where the data of the measurements were transmitted using a Bluetooth device.
The configuration and control of two cascaded half-controlled-converters (HCC) designed for use with an open-winding permanent magnet synchronous generator (PMSG) wind turbine are investigated in this paper. The system is modeled and simulated in Simulink with the assistance of PLECS. The simulations results demonstrate that by using speed-control-based hysteresis current regulator, pure sinusoidal...
This paper introduces a new designed diesel-electric power-supply unit developed for military purposes. The power-supply unit is divided to two main electric parts, (i) input part which is composed of a sensorless controlled active voltage source rectifier supplied by a permanent magnet synchronous generator, and (ii) output part which is composed of a four-leg three-phase voltage source inverter...
The paper presents the mathematical model of the electric power system with several synchronous generators. It enables the analysis of stability in the circumstances of large disturbance in a power system. The analysis has been performed for the generator with separate excitation and the generator with self-excitation.
The paper analyses the control problem of the fixed speed wind energy conversion system based on the grid connected PMSG drive train and series converter located in its star point. It proposes unique approach to modeling of different types of sinusoidal PMSG in quasi-stationary operation. This provides basis for the development of the control algorithm whose primary function is active damping of the...
This paper addresses some of the problems related to direct temperature measurement of synchronous generator excitation winding in rotation. Excitation winding temperature is used for determining the dynamic limit in a PQ diagram. The paper also addresses procedures of improving the accuracy of surface temperature measurement using the DS18B20 digital temperature probes. The paper also provides experimental...
The paper studies the performance of variable speed wind turbine (VSWT) configuration with non-inverting buck-boost converter. The wind turbine systems consist of permanent magnet synchronous generator (PMSG) connected to diode rectifier, DC chopper and load. New control strategy, based on the maximum power point tracking (MPPT) and limited power point tracking (LPPT) algorithms is used to improve...
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