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Minimization of the dc capacitor is an essential step towards developing and manufacturing compact low-cost hybrid electric vehicle (HEV) converter/inverter systems for high temperature operation, long life and high reliability. Previously, most papers have been focused on the AC-DC-AC pulse-width modulation (PWM) converters with relatively complicated close-loop control methods, while few papers...
Multilevel inverters are increasingly being used due to their superior performance compared to two-level inverters. Different circuit topologies on multilevel inverters have been extensively researched. Conduction and switching losses of IGBT in multilevel inverter is the key factor which could influence the converter reliability and efficiency. In this paper, thermal evaluation is described for four...
There are many proposed inverter design topologies, which exhibit certain advantages and disadvantages in various performance aspects. However there exist few quantitative techniques to optimally develop inverters to achieve different objectives such as size minimization, power loss minimization and reliability maximization. Without the relevant techniques, the selection and design of inverters are...
In large drive applications load-commutated inverters (LCIs) are one of the most used technologies, mainly because of their excellent reliability records. However, LCIs are known to generate interharmonics. They can interact with the mechanical system at torsional natural torsional frequencies of the rotating train, both on the inverter and on rectifier side in weakly connected power systems, such...
MTBF Mean Time Between Failure is a life unit as a million hours or years of the electronic product or systems. Reliability engineering as a scientific discipline is introduced in this paper, with an emphasis on the specific nature of reliability analysis. Applications of reliability analysis in the form of reliability tests are discussed for the ZCZVT (Zero Current Zero Voltage Transition) PWM (Pulse...
This paper presents a new approach for increasing the power capability of standard two level voltage source inverters while increasing the effective PWM frequency by sequential switching of parallel connected inverters. The improved power capability and increased PWM frequency is used for an electrical test bench to test drive inverters under real power conditions. Thereby the parallel connected inverters...
This paper presents a control scheme based on random switching hybrid nonsinusoidal PWM (RS-HNSPWM) in stand-alone inverter-based distributed generation source to regulate and produce a sinusoidal voltage at the point of common coupling (PCC). Due to the nonlinear currents, drown by the nonlinear loads, VPCC becomes nonsinusoidal. The proposed controller takes VPCC as an input and generates a nonsinusoidal...
Pulse width modulated (PWM) inverter can generate common-mode voltage (CMV) which will decrease the system reliability. Firstly, some theoretic analysis and experimental results validate the characteristics of CMV and its adverse effects in this paper, and the methods for its cancellations are also presented. Then a novel inverter output active filter based on a single-phase inverter and a five-winding...
In this paper, physics-based IGBT and diode models are used to simulate two 3-phase VSI systems using different power modules in SABER. The device parameters for two standard SEMIKRON power modules, the 1200 V/75 A single chip module and the 1200 V/300 A multi-chip module, are extracted following parameterization procedure. The effects of three typical degradations are considered, including solder...
Three-level Diode Clamped Multilevel Inverter, generally known as Neutral-Point-Clamped (NPC) Inverter, has an inherent problem causing Neutral Point (NP) potential variation. Until now, in many literatures NP potential problem has been investigated and lots of solutions have also been proposed. However, in the cases of fault and fault tolerant control state, distinctive feature of NP potential variation...
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