This paper presents a new trend in the transportation industry to adopt the multilevel inverter-based propulsion systems and gives the design procedure of a new dc/ac 3-phase 6-level inverter for powering the rail metro cars. The proposed inverter is based on the multilevel converter as it possesses much lower component voltage stress compared with the pulse width modulated topologies. Space vector pulse width modulation (SVPWM) with Back-to-Back Clamped Diode (BBCD) voltage modulation operation is used to achieve voltage regulation and high efficiency at any loading condition. Zero Current Switching (ZCS) operation is achieved without using an auxiliary circuit, which leads to minimum switching losses. The novelty of the proposed inverter lies within the proposed control methodology, which uses a new switching pattern that guarantees a modified SVPWM to eliminate the unwanted harmonics from the output voltage. The new algorithm is developed using numerical iterative solution using Newton-Raphson technique, that was downloaded to the processor using digital signal processing (DSP) developed code. The mathematical model is simple but proven to be effective. As a result, a higher operating efficiency at full-load of 98.5% is achieved as compared to previous efficiency of 97%. Analytical, simulation and experimental results of a 1500Vdc/700Vac 400kW converter are presented to offer the proof of concept. The converter provides real estate savings for the train under floor layout, higher operating efficiency as well as better cost price than the conventional two level pulse width modulated (PWM) hard switched converters.
Purpose
The aim of this paper is to present a method for calculating the electromagnetic fields, forces and current density distribution using Fourier series for a two-dimensional quasi steady state model consisting of a conducting uniform plate moving relative to an arbitrary current source with time harmonic excitation.
Design/methodology/approach
The presented solution is valid for an arbitrary source. A specific source is chosen consisting of a single coil made up of two-time harmonic current filaments. The solutions are derived and presented in a form that allows its expansion to include an arbitrary number of spatially shifted coils conducting arbitrary harmonic currents.
Findings
The analytical solution is compared to simulations produced using commercial finite element analysis software, ANSYS Maxwell2D and COMSOL, and is found to be in good agreement. The analytical solution provides a direct method to analyze the spatial harmonics in the system and can be computationally significantly faster especially at high relative speeds between the primary source and conducting plate.
Originality/value
The presented Fourier series solution is applied to simple 2-D model of a single coil with AC current excitation moving relative to a conducting plate. An analytical solution and analysis of this system has not been presented before, to the authors’ knowledge, using Fourier series or any other method.
Purpose
This paper aims to present a method for calculating electromagnetic fields, eddy currents and forces for a quasi-static two-dimensional (2-D) model of linear induction motors (LIMs) where the primary side is modeled as a collection of individual coils.
Design/methodology/approach
An analytical solution using Fourier series is derived for a general source with current excitations residing in an airgap and moving relative to a conducting plate and back iron. Ideal magnetic material with infinite permeability is used to model the primary iron above the primary source and the back iron below the conducting plate.
Findings
The analytical solution is compared to a commercial 2-D finite element analysis (FEA) simulation for validation and then compared to a 2-D FEA model with a more detailed geometry of the LIM. The analytical model accurately predicts LIM thrust even though the geometry of the primary core is simplified as an infinitely long flat slab. 2-D frequency FEA can be used successfully to predict in motion LIM performance.
Originality/value
The analytical solution presented here models the primary excitations as individual discrete coils instead of current sheets, which all existing models are based on. The discrete coils approach provides a more intuitive and realistic model of the LIM.
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