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Electrolytic Capacitor (E-cap) is one of the lifetime bottlenecks in power electronic converters. In the last two decades, various active power decoupling circuits have been proposed to improve the reliability of the DC link by eliminating the DC-link E-caps. However, additional active devices could change the stresses of the existing converters, whether the system reliability is improving or not...
In this paper, key aspects of silicon-carbide (SiC)-based automotive traction drives are reviewed. Firstly, the required supporting factors to achieve optimal operating conditions and best performance are described. Major component sizing methodologies and constraints are included. Expectations on gate threshold voltage, trans-conductance, and transient oscillation are discussed. Tolerance against...
The model based temperature control system examined in this paper increases the expected lifetime of IGBT power modules by decreasing the magnitude of temperature swings occurring during operation. In order to achieve this goal additional power losses are produced during low load conditions. This is carried out by presetting a reactive current. The three level neutral point diode clamped three phase...
In the last decades, the interest in solar photovoltaic (PV) energy has increased considerable around the world. That are many publications that focus on the temperature assessment of PV modules and solar heat collectors but fewer discuss the temperature and reliability evaluation of PV-inverters components. IGBT power modules are the key components from the reliability point of view. Some solar power...
Reliability of Active Front End (AFE) converter can be improved if converter faults can be identified before startup. Startup diagnostics of the LCL filter can be an useful tool to accomplish this. An algorithm based on Fast Fourier Transform (FFT) of the filter step response is shown to be able to detect variation of filter components. This is extended to consider conditions of short circuit and...
The global environmental activities in industries requires for motor drive inverters to expand application fields to higher capacity and with higher reliability. The paper introduces some of developments satisfying the requirements. The first development is a cell unit rated at high current in the range of kA. The advanced paralleling technologies are taken in both electric and cooling designs. The...
For electric vehicle applications, the AC inverter used for the electric propulsion drive has to be dimensioned for a sufficiently long lifetime and high reliability. During start-up processes the semiconductors are mostly stressed which has a negative effect on this reliability. With the help of active thermal controllers, these critical states can be reduced by a temporary adaption of the switching...
This paper presents the concept and characterization of a NPC1 phase leg built up out of three PrimePACK™ 2 power modules with .XT and 1200 V IGBT5. The target application of such a topology is 1500 V solar central inverter. After a short description of the cosmic ray reliability issues leading to the NPC1 approach, different design concepts will be discussed. Double pulse measurements have been used...
Battery energy storage system(BESS) connected to the grid by power conversion system(PCS). Currently Cascaded Multilevel Converter(CMC) and Modular Multilevel Converter (MMC) are two more advanced topologies for PCS. This paper compares CMC and MMC topologies in aspects of efficiency, harmonic characteristics, reliability, control system complexity and cost, the simulation results are presented. Suggestions...
Power Electronics is essential in almost most of the modern renewable energy generation in order to enhance the efficiency of the generation. Converters are used as an interface between load and PV panels particularly for Maximum Power Point Tracking (MPPT). This paper introduces the reliability model of solar PV generation system not only on the physical characteristics but on the simulated operating...
This paper investigates the reliability of different topologies of grid connected photovoltaic (PV) systems. The topologies considered in this study are centralized topology, string topology and multi-string topology. The reliability of each topology is evaluated by using suitable reliability indices that are based on calculating the probability of different operating states. These states are evaluated...
This paper investigates the reliability of 3-phase, 2×3-phase and 5-phase inverters for a marine propulsion application. Analytical formulae and thermal model are used to assess the junction temperature of the semiconductors. The overall failure rate of the inverter is calculated by using the individual failure rate of each semiconductor, which depends on its junction temperature. In case of open-phase...
Solar inverters are mainly classified as voltage source based solar inverter and current source based solar inverter. The comparison of voltage source inverter (VSI) and current source inverter (CSI) is presented in this paper. Conventional CSI generate high earth leakage current into the grid. Therefore, conventional CSI requires an intermediate isolation transformer to feed power to the grid. The...
The widespread adoption of mixed renewables urgently require reactive power exchange at various feed-in points of the utility grid. Photovoltaic (PV) inverters are able to provide reactive power in a decentralized manner at the grid-connection points even outside active power feed-in operation, especially at night when there is no solar irradiance. This serves as a motivation for utilizing the PV...
X new reliable three-phase inverter using three intelligent power modules is proposed, of which the performances are improved in size and reliability. The intelligent power module has ite ow n DSP(ARM Cortex M) which can monitor the operation at each pole of the inverter, protecting the faults, and transfers the important data between the main controller and the module. One of the receiving data is...
Reliability of Power inverter in an Electric Vehicle is of great importance as it is one of the most critical components of the electric powertrain. The failure rate prediction model (parts count method) is utilized to calculate reliability of Power inverter topologies. It is found that paralleling the switching devices increases the reliability of the Power inverter but the reliability saturates...
Current energy paradigm of mixed renewables seems to urgently require reactive power provision at various feed-in points of the utility grid. Photovoltaic (PV) inverters are able to provide reactive power in a decentralized manner at the grid-connection point even outside active power feed-in operation, especially at night. This serves as a motivation for utilizing the PV inverters at night for reactive...
Reliability is one of the most important parameters in aircrafts. In this paper, a method for the calculation of reliability (i.e. number of failures / 106 hours) of a three-phase full-bridge inverter, which is employed in the dynamic waste heat recovery system of an aircraft, is presented. The main factors for the reliability analysis that have to be considered is the topology of the inverter, the...
The three-level (3L) neutral-point-clamped (NPC) voltage-source (VSC) converter has been the standard solution in medium-voltage range for industrial applications. Recently, the NPC converter structure was improved by adding two extra active switches per phase leg, thus overcoming one of its main drawbacks: the unequal power loss among the power semiconductors. The resulting structure became known...
Fuji Electric developed a 1200V class RC-IGBT based on our latest thin wafer process. The performance of this RC-IGBT shows the same relationship between conduction loss and switching loss as our 6th generation conventional IGBT and FWD. In addition its trade-off can be optimized for hard switching by lifetime killer. Calculations of the hard switching inverter loss and chip junction temperature (Tj)...
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