Generator with modulated magnetic flux for wind turbines

Abstract

Abstract. In the paper, the concept of a permanent magnet synchronous generator (PMSG) with uniquely designed stator windings for wind turbines is presented. Two 3-phase windings in the stator are used, one of which is connected in the star, while the other in the delta configuration. Six-pulse rectifiers, mutually coupled by the pulse transformer, whose primary winding is supplied by the so-called "current modulator", are placed at the outputs of both windings. The modulator output current should meet all the necessary and strict requirements. Both rectifiers operate on a common DC circuit. These solutions provide the sinusoidal magnetomotive force in the stator of the PMSG and the quasi-sinusoidal (taking into account the non-linearity of the magnetic circuit) magnetic flux. In light of the generator principle, it has been called the "PMSG with modulated the magnetic flux". The slightly higher complexity in the structure of the generator, as compared to the normal threephase construction, is compensated by the exceptional simplicity of the power electronics section of the system, which allows high efficiency to be reached. The current modulator (as well as the pulse transformer) is a power electronics converter with a relatively low output power as compared to the overall output power of the system. In comparison to other known solutions, the expected cost of the system should be lower. It is also expected that a high degree of reliability in terms of its operation will be achieved, and consequently, that the the ongoing costs of its maintenance will be reduced. In the paper, concept, theoretical basis of operation, and results of the studies of the simulation models of the generator, including the basic power electronics section, are presented.

Modified Efficient Energy Conversion System Based on PMSG with Magnetic Flux Modulation

“…The geometries of the magnetic circuits of both models were identical. The only difference was related to the design of the stator windings [10]. The individual coils were placed in the same slots, and the numbers of turns in the star and delta coils were set to produce the same value of electromotive force between the lines.…”

“…The individual coils were placed in the same slots, and the numbers of turns in the star and delta coils were set to produce the same value of electromotive force between the lines. For comparison purposes, the simulation parameters, including mesh density, time step size, and Newton Raphson procedure tolerance, were retained during model testing [10]. Due to the different numbers of turns in the star and delta winding coils, the slot current eq i was determined.…”

“…Figure 1. Block scheme of the power conversion system based on synchronous generator with magnetic flux modulation, where i A1 , i B1 , i C1 -phase currents for star windings; i A2 , i B2 , i C2 -phase currents for delta windings; i RCT1 , i RCT2 -output currents of diode rectifiers; u RCT1 , u RCT2 -output voltages of diode rectifiers; i CM -current of modulator; and i out -load current [10].…”

Bulletin of the Polish Academy of Sciences: Technical Sciences

“…The method stil can be used on a preliminary stage of a multidimensional numerical optimisation process to significantly shorten the overall time consumption The computational efficiency is particularly important when multi variable optimisation is conducted, using some modern algorithms such as: PSO [20], GA [21], or ABC. The development of fast method for numerical support of design processes has a great importance for designing the machines best suited for particular applications [22,23].…”

Electromagnetic energy converter based on the claw pole principle

“…Weltweit ist der dringend notwendige Paradigmenwechsel von der Nutzung fossiler Rohstoffe als Basis der Elektroenergieerzeugung hin zur nachhaltigen Gewinnung von Elektroenergie aus erneuerbaren Quellen zu beobachten [1]. Besonders die Nutzung von Windenergie zeigt in diesem Prozess großes Potenzial mit hohen Wachstumsraten [1,2]. Dies geht einher mit dem allgemeinen Trend zur Nutzung von Alternativen zu fossilen Energieressourcen in nahezu allen Wirtschaftsbereichen.…”