The thesis focuses on constructing dynamic model - synchronous generator with using magnetic equivalent circuit diagrams. The model construction is based on knowledge of geometric parameters, magnetic characteristic of used material and fyzical deployment of vindings placed in stator slots. Computed reults are compared with results optained from model created with finite element method.

This thesis deals with the reactive power compensation, namely the possibility of reactive power compensation in Petrochemie company using a passive power factor correction system instead of synchronous generators, as part of the contract Kompel company. The thesis analyzes problems of definition of power in circuits with sinusoidal and nonsinusoidal voltages and currents. Furthermore, this thesis describes the power factor correction systems used in the low and medium voltage industrial and distribution networks. The last four chapters contain description of the existing state of power plant in Petrochemie company. There are considered the possibility of use of existing power factor correction system owned by company. The new static power factor correction system is suggested and functionality of power factor correction systems is verified through the simulations.

This master thesis is focused on the synchronous generator mathematical model analysis. Based on the analysis are compiled mathematical models of main generator and exciter cooperating in brushless synchronous generator excitation system. Mathematical models of both machines are based on system of differential equations and their validity is verified in Matlab-Simulink. The master thesis is devided into three main parts. First part is focused on the derivation of differential equations to describe the behavior of electrical quantities of machines. In the second part are compiled and simulated mathematical models of both synchronous machines in Matlab-Simulink. The correctness of models are verified by approximate analytical calculations of selected steady and dynamic states. The last part is focused on design and simulation of concept for main generator rapid field winding deexcitation in brushless synchronous genereator excitation system.

The aim of this work is to theoretically evaluate the test (type and routine) of synchronous generators and then practically measure and evaluate in the resulting protocol type. The theoretical part contains an analysis of standards for individual tests and a description of the actual design in the test room of electrical machines. Part of this work is to show the cost of the tests with the analysis of the incremental costs and measurement uncertainty.

This Master’s thesis deals with analysis of mechanical behaviour of the synchronous generator and assessment of the possibility of reducing the mass of the frame of the generator. The aims of this work were: to perform the stress-strain analysis and modal analysis of the required model of the synchronous generator, to assessment influence of single part of the frame of the generator over its stiffness and design construction modification of the frame of the generator, which reduce its mass.

This thesis focuses on creating of a computational model for stress-strain analysis of parts of a generator. Computational model is parametric and it allows use of various geometric variants of the shaft and rotor lamination. Parametric computational model in APLD language is compiled in the attached sheet of software MS Excel after entering input values. After solving in software ANSYS 14.5 are results imported into MS Excel sheet for further post processing.

This research work focuses on the reactive power compensation of the permanent magnet synchronous generator (PSG) in wind power plants. PSG feeds a fixed voltage dc grid through a rectifier bridge. In variable speed operation, the PSG will be able to build torque only in small speed range. This is due to the fixed magnet of the PSG. External reactive power compensation provides an attractive solution to overcome this problem. Different reactive power compensation configurations were examined. Statics synchronous series compensation and a shunt passive filter were chosen as a compensation method. Simulation and implementation of small wind power plant were performed. The wind power plant consists of the synchronous generator, inverter, rectifier, coupling transformers and shunt passive filter. The experimental results agree to the proposed theory and simulation results. / Der Schwerpunkt meiner Promotion ist die Blindleistungskompensation bei einem permanenterregten Synchrongenerator. Der Synchrongenerator speist das Gleichsspannungsnetz über ein Gleichrichter. In der Drehzahlvariablen Betriebsverhalten können Nachteile auftreten. Die Folge ist, dass bei konstanter Gleichspannung und fester Erregung durch die Permanenterregung nur ein sehr kleiner Drehzahlbereich mit vernünftiger Drehmomentausbeute bedienbar ist. Ein möglicher Ausweg wäre eine variable Kompensationsspannung. Verschiedene Kompensationsverfahren wurden untersucht. Ein Series Active Filter und ein Shunt Passive-Filter wurden als Blindleistungskompensation gewählt. Im Rahmen meiner Dissertation beschäftige ich mich mit dem Aufbau und der Simulation einer Windkraftanlage. Diese besteht aus einem permanenterregten Synchrongenerator, einem Wechselrichrter, einem Gleichrichter, drei Transformatoren und einem passiven Filter. Das Versuchsergebnis zeigt, dass die Theorie mit der Simulation übereinstimmt.

In diesem Beitrag wird eine fertigungsoptimierte Methode der Nutrastmomentreduzierung durch Magnetverschiebung am Beispiel eines Synchrongenerators für Kleinwindenergieanlagen mit in die Läuferoberfläche eingelassenen Permanentmagneten vorgestellt. Auf Grundlage der Drehfeldtheorie wird ein analytisches Berechnungsmodell unter Einbezug der Magnetverschiebung zur Bestimmung des Nutrastmoments entwickelt und mit FEM-Simulationen verifiziert. Durch experimentelle Untersuchung eines gefertigten Prototyps wird der optimierende Effekt der Magnetverschiebung nachgewiesen und mit einem Referenzläufer mit ungeschrägt, symmetrisch verteilten Polen verglichen. Abschließend werden mögliche Ursachen für die verbleibenden Abweichungen identifiziert und Ansätze für die weiteren Betrachtungen abgeleitet. / A production-optimized method of reducing cogging torque by magnet shifting using the example of a synchronous generator for small wind turbines with a rotor with inset surface magnets is proposed in this paper. On the basis of rotating field theory an analytical calculation model is developed taking into account the magnet shifting for determination of cogging torque. The analytical results are verified with FEM simulations. By experimental investigation of a manufactured prototype, the optimizing effect of magnet shifting is verified and compared to a rotor with symmetrically distributed poles. Finally, possible reasons for remaining discrepancies are identified and approaches for further considerations are presented.

This thesis is a study on an unconventional slow speed direct drive permanent magnet (PM) generator. Unlike a standard permanent magnet synchronous generator (PMSG) which has the copper coils wound around iron teeth, the work in this thesis will present a generator where the copper coils are directly mounted on the stator which eliminates the slots and teeth in the generator. By having a slotless design it is possible to eliminate cogging torque, iron losses in teeth and achieve a lightweight design. These characteristics can prove useful when developing generators for an application such as wind turbines, or more specifically vertical axis wind turbines (VAWTs) in remote areas where weight and serviceability is of concern. This thesis consists of two main parts where the main focus was on the design and simulation of slotless generators. The second part of the thesis was to investigate an available slotless axial flux machine. For the simulations, three different models were created in 2D using CAD software. Two of the models were double-rotor slotless generators and one was a single rotor variant. The electromagnetic properties of these models were analysed using FEMM and COMSOL. The results showed that the double rotor variant with the smaller magnets were more favourable considering the price of magnets and no iron core losses. The experimental results of the axial flux machine gave insight into the construction of commercially available axial slotless generators which could be used to further analyse these types of machines.

Bei eigengekühlten Elektromaschinen in Außenläuferbauweise resultiert aus der schwierigeren Abführung der Statorverluste üblicherweise eine Reduktion der elektromagnetischen Ausnutzung. Im Beitrag wird am Beispiel eines permanentmagnetisch erregten Synchrongenerators für eine Kleinwindenergieanlage das Verfahren der intensivierten Statorrohrinnenkühlung unter Nutzung der Windströmung durch einen im Statorrohr angeordneten Kühlkörper diskutiert. Neben der elektromagnetischen und strömungsmechanischen bzw. thermischen Modellierung wird die experimentelle Trennung der Einzelverluste vorgestellt. Es wird gezeigt, dass die Ausnutzung der Maschine durch die intensivierten Statorrohrinnenkühlung um ca. 40 % gesteigert werden kann. / For self-ventilated electrical machines in outer rotor design, the difficult dissipation of stator losses usually results in a reduction of the electromagnetic utilization. Based on an example of a permanent magnet synchronous generator for a small wind turbine, the method of intensified inner stator tube cooling using the wind flow through a heat sink arranged in the stator tube is discussed in the article. In addition to the electromagnetic and fluid mechanical as well as thermal modeling, the experimental separation of the losses is presented. It is shown that the utilization of the machine can be increased by approx. 40 % by means of the intensified internal cooling of the stator tube.