Solid-state switch-mode rectification converters have reached a matured level for improving power quality in terms of power-factor correction (PFC), reduced total harmonic distortion at input ac mains and precisely regulated dc output in buck, boost, buck–boost and multilevel modes with unidirectional and bidirectional power flow. In this paper, an improved power quality converter employing con...

The single phase cascaded H-bridge multilevel inverter (Thirteen level) is designed for industrial applications and has a decreased number of switches. Cascaded Multilevel Inverters are widely used in the electric utility industry motors. When these inverters directly drives, THD contents output voltage extremely important since performance drive highly dependent on quality applied to it. symme...

With the development of flywheel technology, speed and voltage level continue to increase. The Z-type self-balancing modular multilevel converter can have a wide frequency range at medium is suitable for driving application. However, current characteristics variable drive still affect capacitor balance in each phase-leg. new be achieved by controlling circulating current. This paper proposed co...

This paper presents a new three-phase five-level inverter for direct torque control (DTC) drives application. The advantages of the inverter are reduced output harmonics, switching losses and number of power switches. The multilevel PWM modulation method as well as output voltage analysis based on symmetrical sampling are presented. The proposed inverter is compared with the conventional invert...

In this paper, we present the performance of a hybrid alternative phase opposition disposition pulse width modulation technique for soft switched cascaded five level inverters. The proposed modulation scheme inherits the switching loss reduction along with reduced harmonic performance of cascaded multilevel inverter fed drive system. The inverter topology used here has recently suggested in the...

theoretically and empirically, it has been often argued that production uncertainty affects the farmers’ production efficiency. insurance can play an impactful role in reducing the uncertainty and, consequently, increasing the investment. using multilevel models, we examined the effect of agricultural insurance programs on investment in the agricultural sector of khorasan razavi province. the c...

background : the age standardized incidence rates of esophageal cancer in women and men in iran have the fifth and eighth ranks, respectively. due to the high incidence rate of esophageal cancer and the necessity of knowledge of its geographical distribution, the incidence of this cancer was mapped at province and county levels in the present study. methods: the study population of this empiric...

Use of multilevel inverters has become popular in recent years for high-power applications. Various topologies and modulation strategies have been investigated for utility and drive applications in the literature. Trends in power semiconductor technology indicate a tradeoff in the selection of power devices in terms of switching frequency and voltage-sustaining capability. New power converter t...

this paper develops new results on the use of model predictive control to regulate the attitude of a ground station antenna. two degree of freedom az-el pedestal is considered as ground station antenna. permanent magnet synchronous motors are taken into consideration as the best choice for satisfaction of control objectives as actuators. the design is based on a two cascade controller consist o...