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Three-level Vienna Rectifier with a Brushless and Permanent Magnetless Generator for Wind Energy Conversion Systems

Bhattacherjee Haimanti, Mukherjee Debranjan, Chakraborty Chandan

Power Electronics and Drives

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2022

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Vol. 7 (42)

84--102

EN

This paper proposes a system design and control technique for a newly developed brushless and permanent magnetless synchronous generator-based variable-speed wind energy generation system, transferring power to a constant voltage dc grid via a three-level Vienna rectifier (VR). The recently established generator named Brushless Induction excited Synchronous Generator (BINSYG) is a wound field synchronous generator (WFSG), whose excitation is developed by controlling an Induction Machine fitted to the same machine structure and sharing the same magnetic core. A new controller is proposed that ensures the stable operation of BINSYG for a wide variation of shaft speeds. VR achieves sinusoidal input current and can control the power factor at its input, which is particularly suitable for wind energy applications. The top and bottom capacitor voltages of the VR are balanced using redundant switching combinations. The system with its proposed control algorithm is modelled in MATLAB/Simulink for a 5 kW rated BINSYG feeding power to a 750 V dc grid. The steady-state and dynamic state simulation results are presented and the controller performance is verified for a wide range of wind speeds. Further, real-time results using the OPAL-RT testbed are presented for the same system to verify the effectiveness of the overall control strategy.

2

Feasibility study of the electric power generation unit start-up using the three-phase synchronous generator with the AC exciter

Racewicz S., Olejnik A.

Journal of KONES

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2016

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Vol. 23, No. 3

411--417

EN

The article presents the feasibility study of using the three-phase synchronous generator with the AC exciter as a starter for the Fiat 0.9 TwinAir CNG 80 HP internal combustion engine. The investigated power generation unit consists of the above mentioned internal combustion engine which can be powered by a biogas and the three-phase electric power generator MeccAlte 16 kW with the AC exciter. The use of an electric generator for starting a combustion engine is an innovative approach, which eliminates the need for additional components like starter reducing the mass and the failure frequency of the device. Similar approaches have been already investigated by the aircraft manufacturers for starting the jet engines of the airliners and are widely used in the hybrid engines for vehicles. The field winding of the three-phase synchronous generator described in the paper is connected to the AC exciter via a rotating rectifier bridge. This solution eliminates the necessity of using slip rings and facilitates a voltage regulation of the generator. The authors of the paper analyse the technical and practical possibilities of using such a synchronous generator with the exciter as a starting motor by measuring its output power and starting torque. The economic aspects of such a solution for unit and mass production have been also considered.

3

Conception and design of a hybrid exciter for brushless synchronous generator. application for autonomous electrical power systems

Yong J., Kostro G., Kutt F., Michna M., Ronkowski M.

Prace Naukowe Politechniki Śląskiej. Elektryka

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2010

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z. 1

7-21

EN

In this paper a hybrid excitation system for a brushless synchronous generator working with variable speed in an autonomous energy generation system (e.g. airplane power grid) is presented. A conception of a dual-stator hybrid exciter is proposed. Comparison study of classical and hybrid exciter has been carried out. For the electromagnetic calculation two approaches have been applied: analytical approach (based on the circuit model and sizing equations) and numerical approach (using field simulator FLUX2D). Provisional design calculations have been performed using the analytical approach. Next, to verify the calculation results and to optimise the magnetic and electric circuit of the machine, the field simulator FLUX2D has been used.

PL

W artykule zaprezentowano hybrydowy układ wzbudzenia bezszczotkowego generatora synchronicznego, pracującego ze zmienną prędkością obrotową w autonomicznych systemach generacji energii (np. sieć elektroenergetyczna na pokładzie samolotu). Zaproponowano koncepcję wzbudnicy hybrydowej z podwójnym stojanem. Wykonano analizę porównawczą wzbudnicy klasycznej i hybrydowej. Obliczenia elekromagnetyczne wykonano dwoma sposobami: analitycznie (oparte na modelu obwodowym i zależnościach wymiarowych) i numerycznie (zastosowano symulator polowy FLUX2D). W pierwszym etapie wykonano obliczenia wstępne metodą analityczną, a następnie do weryfikacji wyników obliczeń wstępnych i optymalizacji maszyny zastosowano symulator FLUX2D.