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This paper reviewed the development of a 3-phase 125 kW grid connected PV inverter and changes in the conversion performance of the inverter based on the gain of the low frequency isolation transformer for isolation between solar and the grid. The 125 kW PV inverter consists of a transformer with the grid frequency for isolation between input and output (galvanic isolation) and it has the output power...
This paper presents a method for characterizing the average error voltage in the zero-crossing region of the inductor current during the dead time. The analysis makes use of an existing analytical solution to model the reverse recovery of the power diodes in this region. The proposed analytical solution is verified by experimental results.
This paper presents a new methodology for fault detection and identification in power system drives. The stationary wavelet transform is the tool used through the analysis of the three phase stator current signals measured at the stator of an induction machine fed by a three phase voltage inverter. Fault scenarios with one open-switch are considered because they are the most likely to occur. Several...
This paper presents a new design for general inverter using line voltage direct PWM technique. This new scheme is different from the conventional inverter basing on the SPWM technique. This new scheme doesn't using high frequency signal injection method to improve the DC voltage utility of inverter, so the algorithm is very simple contrast to the SPWM technique. The system is very clear and suitable...
A new dasiaextended turn-off timepsila compensation parameter is introduced to overcome the low-current nonlinear voltage distortion effect in IGBT inverters. The compensation technique uses datasheet parameters in conjunction with an analytical approach to model the low-current switching characteristics of an IGBT. As a result, output voltage amplitude is accurately controlled and low-order voltage...
Actual market of medium-voltage inverter for industrial applications: 1. Voltage Source Inverters cover a power range up to 30MW with high control dynamic demand IGBT-Modules: for standard applications IGCT/IGBT-semiconductor discs: for applications with high load cycling requirementsSiemens Converter-Portfolio Actual market of medium-voltage inverter for industrial applications:1a.3L-NPC:-suitable...
This paper proposes the experimental characterization and modeling of thermal runaway phenomena affecting high-voltage devices in the blocking state. In particular, it considers 6.5 kV rated multi-chip IGBT modules, of the kind employed in railway traction applications, showing how temperature and reverse bias voltage influence the off-state power losses and how the same thermal design may yield thermal...
Short circuit III is the occurrence of a short circuit across the load during the conducting mode of the freewheeling diode. This has the same importance for the application of high power IGBTs as the known short circuit II. Different to short circuit II, the IGBT of the same module is now turned-on starting from very low voltage across its terminals and showing a forward recovery voltage before saturating...
This paper aims to determine the maximum frequency achievable in a 25 kW series inverter for induction heating applications and to compare, in hard switching conditions, four fast transistors IGBTs 600 A and 1200 V modules encapsulated in 62 mm from different suppliers. The comparison has been done at 25 and 125degC in a set-up. Important differences between modules have been obtained depending on...
In this paper a precise and simple methodology will be introduced for modeling and calculating the voltage source inverter (VSI) losses in hybrid electric vehicles (HEV) application. The noteworthy traction inverter losses, consisting switching and conduction losses of diodes and IGBTs, are important for evaluating the overall efficiency and obtaining the optimized value of its dc-link voltage as...
State-of-the-art doubly-fed induction generator drives avoid operation at synchronous speed. Engineers point out stability problems and unequal heating of semiconductors and windings as the main reasons. The latter problem is consequence of unequal losses distribution in the semiconductors and rotor windings. This work investigates the thermal behaviour of the inverter switches at this singular point...
F3E (fundamental frequency front end) is the denomination for a converter with active rectifier and negligibly small DC-link-capacitance. These converters are normally used to operate 3-phase-motors, especially in applications where power regeneration is required. The simplicity and high efficiency of F3E-converters makes them suitable also for renewable energy applications (wind, water etc.), or...
A simple method of serial connecting IGBT's is applied and standard low voltage IGBT modules are used in the MV test inverter to evaluate the method. The dc link voltage is 2.4 kV and the RMS output line to line voltage is 1.7 kV. The method works and test experiences are presented in paper.
This paper presents the 70 kW inverter dedicated for future aeronautical applications in the frame of the MOET program, a FP6 European Integrated Project. Design considerations, principle of operation and experimental results will be presented hereunder. For DC to AC conversion, technologies improvements and specific integration allow reducing weight and volume and increase the power density up to...
Modern railway traction converters are equipped with IGBT-modules. Due to the mode of operation and a service lifetime of 30 years, typically specified for traction applications, the cycling capability is an important issue in converter design. The requirements from the application are summarized and design targets for the next generation of IGBT modules are discussed in this paper.
Power electronics has been a major technology driver in traction applications. Today we find an established and well proven converter solution for the whole power- and voltage range needed in traction. Today's challenges therefore lie mainly in two aspects, how to provide a platform with minimum engineering effort for new vehicles and how to incorporate new technologies like permanent magnet machines,...
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