The modular multilevel converter is capable to reach high-voltage levels with high flexibility, reliability, and power quality as it became the standard solution for high-power applications that operate fixed frequency. However, in machine-drive applications, shows critical problems since an extremely submodule-capacitor voltage ripple occurs machine start-up at low-speed operation, which can d...

Multilevel topologies with SiC devices for medium-voltage (MV) motor drive have advantages to reduce the harmonics and device voltage stress increase efficiency. However, application of devices, reflected wave phenomenon still happens in multilevel drives due its high dv/dt, resulting overvoltage at terminals. This article proposed a T-type circuit-based active canceller (ARWC) suppress an M-le...

First of all, in this paper, the topology and operation of the three-phase three-level Z-source inverter based on neutral-point-clamped (Z-NPC) are studied. Moreover, different combinations of permissible switching states and control signals are explained for this inverter. In this paper, the topology of the three-phase three-level Z-NPC inverter is extended for an n-level state. Also, a combin...

In this paper, one-cycle control (OCC), as a constant-frequency PWM control strategy for current control of a six-switch brushless dc (BLDC) motor drive is investigated. Developed current regulator is a unified controller and PWM modulator. Employing the one-cycle control strategy, decreases the torque ripple resulted from the conventional hysteresis current controllers and therefore, the vibra...

Drawing on the conceptual foundations of feedback and behavior modeling we investigate the effects of managers’ coaching intensity on the performance of those they supervise, at multiple levels of an organizational hierarchy. Data from 328 sales associates reporting to 114 middle managers, and 93 middle managers reporting to 32 executive managers are used to test the research hypotheses. Using ...

this research develops a two-level model based on hypotheses, which concern relationships among role ambiguity, role conflict, job involvement and salesperson performance at individual level and collective sale self efficacy, customer orientation and competitive climate at sale unit level in iranian food industry. data was drawn from 482 sales people in 30 companies , using a 51-item self-repor...

In order to remove undesirable lower harmonics from a cascaded H-bridge multilevel inverter and solve constrained in design optimization issue with parameters involved changeable objective function for the given system, TLBO approach is provided. To test stability of recommended system output was designed be supplied various load drive systems. The entire efficiency wind grid inverters has now ...

This article sets the stage for a special issue that examines interplay between subnational and supranational governance. It begins by discussing how territorial architecture of government has become more multilevel as national governments have shifted authority both downwards to upwards international institutions. Next, we argue this structure emanates from tension drive reap functional benefi...