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A T-type three-level inverter topology with RB-IGBT is researched. The operation modes and modulation strategy is analyzed. The power loss of T-type inverter with RB-IGBT and normal IGBT is calculated and compared. Experimental results show that T-type inverter with RB-IGBT has better efficiency than that of normal IGBT.
In this paper, a hybrid multilevel inverter topology for the generation of dodecagonal space vectors is presented which eliminates all (6n±1), n=odd harmonics from the motor phase currents in the entire range of modulation with an increase in the range of linear modulation. The topology is a hybrid of flying capacitor, H-bridge and conventional two-level inverter cells. With this topology, any standard...
Direct Water and Double-Sided Cooled Power Modules (DWDSCPM) are especially attractive due to high thermal performances. The DWDSCPM was able to reduce the thermal resistance by 50% and increase power density of the traction inverter by 70% in comparison with a conventional power module.
In current paper it is described a new topology of a three phase soft switching inverter. The aim is to develop a robust and practical soft switching inverter used in high power and high switching frequency applications. The presented topology is using coupled inductors and gives significant practical advantages when compared with similar topologies. The circuit can provide a mechanism by which the...
The penetration of the distributed power generation systems (DPGSs) based on renewable sources (PV, WT) is strongly dependent on the quality of the power injected to the utility grid. However, the grid impedance variation, mainly caused by grid faults somewhere in the electric network, can degrade the power quality and even damage some sensitive loads connected at the point of the common coupling...
With a new control concept presented in this paper, wind power stations with inverter-coupled synchronous generators (SG-WPS) behave to a great extent like the turbine-generator sets of conventional thermal power plants including the ability of the release of active- and reactive reserve power. This allows every single SG-WPS to improve its contribution to power grid stability. The new control concept...
The paper considers on-board battery charging of electrical vehicles (EVs) using a multiphase voltage source and a multiphase propulsion motor. The multiphase inverter and the multiphase machine are fully integrated into the charging process. The proposed integrated on-board battery charger has an advantage of unity power factor operation with no torque production in the machine during the charging...
Large power three-level voltage source inverters with IGCTs are widely used in medium and large power drive systems now and have prospective future. Measures should be carefully taken to protect the inverter when over-current occurs due to every reason, especially that due to short circuit in the load or in the inverter itself. The short circuit process of the inverter with IGCTs is analyzed. With...
This paper proposes a systematic procedure to evaluate, compare and select different modulation techniques for a medium voltage variable speed drive. Several indicators are proposed to be analyzed, mainly based on thermal analysis, voltage limitations, dc bus evaluation and load current quality. The suggested procedure is evaluated on a simulation based analysis in a 6.6 kV adjustable speed drive...
This paper presents a hybrid PV-battery grid connected system suitable for high power PV power applications. High power PV systems have impressive voltage fluctuation with regards to their maximum power point voltage. Using DC/DC converters to regulate this voltage is inefficient in high power systems as it adds an extra power conversion stage. On the other hand switching frequency, voltage stress...
In this paper the recently introduced control strategy referred as variable switching point predictive torque control (VSP2TC) is employed to control a three-level neutral point clamped (NPC) voltage source inverter driving an induction machine (IM). Based on a predictive torque control (PTC) scheme, the controller aims to reduce the high current and torque ripples that occur. In order to actualize...
Parallel voltage-source inverters with common dc bus present very interesting advantages from an industrial point of view. Indeed, by paralleling several units the power supply system includes capability to handle high power requirement, modularity and the possibility of maintenance through redundancy, within an uninterruptible supply operation. However, a special attention is required to avoid the...
In variable speed drive applications the inverter fed induction machine is one of the most reliable systems. However, increasing demands on efficiency leads to higher wear of all system components. Unexpected machine breakdowns cause economic losses and/or undesired scenarios in safety-critical areas. Thus condition monitoring of all components can reduce the risk of outages due to faults. High electrical...
The four-leg inverter (4LI) which drives two induction motors have been studied, but the drives of two permanent magnet synchronous motors (PMSMs) fed by a four-leg inverter have not been studied. PMSMs can drive not only speed control but also position control. This paper shows the characteristics of two PMSMs independent drives fed by a 4LI. First, this paper shows the method of 4LI to drive motor...
This paper deals with the approach of integrating a CSI into the power train of a BEV using a nouveau control strategy. The proposed control strategy for CSI provides a better harmonic performance of the electrical machine and is therefore a beneficial advantage for the system performance. Using a test setup especially designed for experimental validation of CSI the introduced control strategy is...
This paper presents a comparison of two-level and three-level converters for high frequency drives. The maximum output power per chip area is calculated and compared by the Total Harmonic Distortion (THD). A variable DC-link voltage is assumed and it is derived, that the three-level topologies suffer more from an increasing DC-link voltage than the two-level inverter. The influence of the cooling...
CERN is studying the implementation of high power active front ends, implying the operation of a voltage source inverters connected to a grid that can be considered as weak when compared to the converter nominal power. Proper synchronisation is a key point for current control stability. The handling of networks with asymmetric disturbances implies the accurate handling of the second harmonic component...
This paper presents a voltage balancing method for a four-level hybrid-clamped inverter. The relationship between the capacitor currents and switching functions is studied. A modified phase-shifted PWM method is used to regulate the capacitor currents by adjusting the start and end time of the PWM signals slightly according to the capacitor voltages and the polarity of the output current. Experimental...
This paper presents the analysis of two AC photovoltaic modules: i) a flyback based, and ii) a full-bridge based. The comparative analysis takes into account the number of semiconductor components, such as switches and diodes, and the delivered power to the grid by each topology. The full-bridge based AC module has one of the highest component count among all the AC modules. In spite of it, it achieves...
The low switching losses of the Silicon Carbide (SiC) components enable power converter to operate at higher switching frequencies and higher junction temperature. Operating at high switching frequencies enables to reduce volume and weight of passive component. Operating at high junction temperature helps to reduce size and weight of the cooling system or even enables the use of a natural cooling...
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