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The paper present a MATLAB-SIMULINK model of a single phase 1.5 KVA RMS controlled VSI inverter using MOSFET. The paper describes the behavior of output voltage and current, the total harmonic distortion (THD), with the variation in input dc capacitor (Cdc), Snubber capacitor (Cs) and Snubber resistance (Rs) for linear and non-linear load. The values of Cdc, Rs and Cs as suggested by other authors...
The operation of PWM motor drives with long cables results in several undesired phenomena. In order to avoid them all, it was proposed in a previous work that the long cable be used to connect the rectifier to the inverter, which would then be placed beside the motor, thus establishing a DC line transmission. In the mentioned work, the additional benefit of the proposal, which is the reduction of...
In this paper, in order to realize high voltage static switches of voltage source inverters in high power applications, two series connected 4.5kV rate Si-IEGT with SiC-PiN diode pairs (hybrid combination) are considered with hard switching method. The switching test of power module that is hybrid combination is carried out under 5kV DC bias voltage. The gate driver circuit is designed by high output...
This paper presents a full-bridge full-wave DC-DC converter used in 35 kVA power grade auxiliary static inverter (SIV) of first low-floor light rail vehicle (LFLRV) in China, where reducing voltage stress in output rectifier diodes is so important for the converter reliability. DC-bias function of high frequency transformer is analyzed and a sensorless digital dc-bias control method by DSP and CPLD...
This paper presents different topologies of voltage inverters with alternative input LC networks. The basic topology is known in the literature as a Z-source inverter (ZSI). Alternative passive networks were named by the authors as T-sources. T-source inverter has fewer reactive components in comparison to conventional Z-source inverter. The most significant advantage of the T-source inverter (TSI)...
Planar busbars have played a significant role in reducing the parasitic/stray inductance in modern high power converters, which is caused by physical current path loop from the IGBT to DC capacitors. Consequently, it may lead to such problems as non-ideal converter operation, over-voltages, voltage drop, current unbalance and resonance with DC capacitors as well as snubber capacitors, especially applied...
This paper proposes an active clamp interleaved forward converter with a single-capacitor turn-off snubber constructed with a full-bridge inverter for stunning poultry applications. The proposed converter can use active clamp circuit to recover the energy trapped in magnetizing and leakage inductors of transformer and to achieve zero-voltage switching at turn-on transition. In addition, the proposed...
This paper presents a single capacitor active snubber circuit for the asymmetric inverters used to drive switched reluctance motors. The proposed configuration uses the motor coil inductance as an integral component in the snubber process, acting in sequence to ensure the low-loss commutation of each inverter main power device. The two auxiliary snubber switches naturally commutate in ZCS mode. Only...
In this paper, the efficiency of the conventional two-level and three-level grid-connected inverter for the photovoltaic (PV) generation is analyzed. And the DC-link voltagepsilas influence on it is also studied. It can be seen that when the inverter does not control the gridpsilas frequency and voltage, a conventional three-level inverter has higher efficiency than that of a conventional two-level...
In the field of electrical solar power conversion efficiency is the most important topic. In most applications a special DC-to-DC converter is necessary to couple the solar cells, operating at low DC voltages, to the inverter's DC-link. These converters with rather low input respectively high output voltage ratings have, due to the high current ratings, a relatively low efficiency. Therefore, a special...
In this paper a new snubber circuit design for three-level inverter will be presented. The so-called "dual snubber circuit" still comprises most of the positive features as a low number of components, improved efficiency due to the low snubber element and power semiconductor losses, reduced over-voltage across the semiconductor devices and no balancing problems. With these advantages, the...
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