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The presented paper deals with control strategy of flying capacitors multilevel inverters. The main issue is the analysis of the permissible switching states, especially the possibility of the multiple commutations.
In this paper, according to power sharing algorithm and types (2 Con & 2 Inv, 2 Con & 1 Inv, 1 Con & 1 Inv) of photovoltaic (PV) and fuel cell (FC) hybrid generation system, control algorithms of converter and inverter are presented. Almost algorithms of PV and FC hybrid generation system are performed and verified to use by technology for commercialization. Moreover, a comparative study...
Actually, AC 16.7-Hz railway grids are fed via back-to-back converters from the public grid. A flux-based multivariable control for the three-phase-side converter is presented, which takes the resonant circuit of the single-phase-side converter into account, leading to excellent stationary and dynamic behaviour.
This contribution deals with a new configuration of traction converter with medium-frequency transformer for multi-system suburban units and locomotives. This paper introduces control of primary voltage source active rectifiers with direct control of trolley current, presents simulation and experimental results of designed low-voltage laboratory prototype of traction converter of rated power of 12...
The paper presents a comparative study of three different 3D-SVM techniques for the control of flying-capacitor multi-level inverters under both balanced and unbalanced operating conditions. Simulation results show that Direct 3D-SVM is the most efficient in computational effort. Application of this scheme to a three-level FCMI is simulated using the Alternative Transients Program (ATP). Output performance...
A project is presented, in which four-quadrant converter, resonant tank and machine-side inverter of a railway traction vehicle operating at single-phase 16.7 Hz are treated as one unit, featuring an integrated model-based control of all quantities. The project aims at improving the dynamic behaviour of the overall system.
This paper deals with the control of the output part of a power electronics converter, which we have designed for a diesel-electric power supply unit for military applications. The output part of the unit is composed of a four-leg three-phase voltage source inverter and a sinusoidal filter. The output part of the power supply unit with help of proposed control system allows to create three-phase symmetrical...
An innovative solution to slip rings and plug connectors is the contactless energy transmission system which is aligned to resonance. For an efficient energy transmission high frequencies (around 100 kHz) as well as an operation in resonance is useful. Some applications need a single-phase (50 Hz) supply a new energy conversion principle can be used to solve the problem. This paper describes a new...
This paper describes an experimental tool to evaluate and support the development of fault tolerant machines designed for aerospace motor drives. Aerospace applications involve essentially safety critical systems which should be able to overcome hardware or software faults and therefore need to be fault tolerant. A way of achieving this is to introduce variable degrees of redundancy into the system...
Integrating various interface converters of small-rated distributed generators into the power system has become a promising solution to rapidly increasing demand of premium electric power. The output voltage of distributed generators, such as PVs, is usually so low that a low-frequency coupling transformer is required to place between the interface inverter and the grid for proper power delivery....
Railway grid interaction is a major concern when developing the power chain of a railway traction vehicle and its control. Especially line-current harmonics and grid stability have to be considered. Developing an optimised control scheme for the four-quadrant line-side converter of a railway traction vehicle operating at the 15-kV, 16.7-Hz grid requires advanced simulation tools, combined with suitable...
Previous research work has demonstrated that microgeneration improves security of supply and contributes to reduce carbon emissions. However, it has also been recognized that it imposes various challenges in particular with regards to network stability, control and protection. This paper focuses on controlling the power flow from converter-connected microgeneration units to the distribution network...
This contribution deals with a new configuration of main traction converter for locomotives containing a medium-frequency transformer. The main emphasis is given on the proposed control of the converters around the medium-frequency transformer which transmits power using 400-Hz square-wave voltage. This paper describes designed control algorithms and presents theoretical conclusions, which are verified...
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