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In this paper, a modified three-phase synchronous reluctance motor model based on stator-fluxes and rotor-fluxes in synchronously rotating reference frame is presented. Being a nonlinear system, three-phase synchronous reluctance motor state estimation is carried out using extended Kalman filter. Additionally, parameter sensitivity analysis is performed to convey which parameter is critical in case of actual motor and model parameters mismatch. Extensive simulation studies are performed under different machine operating conditions and machine model uncertainties. The simulation studies are verified on a 5.5 kW synchronous reluctance motor using MATLAB software. The validity and effectiveness of the proposed model is verified by simulation results.

When a fault occurs in the Radial Distribution System, it may take some time to repair the faulted section, and there is no supply to the rest of the sections which are connected to the faulted section until it is repaired. Therefore, the problem of service restoration is an important task in distribution systems. Service must be restored to out-of-service areas by connecting the isolated sections to the other feeders. This can be done by changing the status of the switches between the zones. The generalized algorithms for the problem of service restoration in distribution systems during a fault at a particular zone were developed using Breadth-First Search are tested on a practical test distribution system. The effectiveness of the proposed Breadth-First search method in terms of computational burden is the efficacy of the presented strategy.

Multilevel inverter plays a crucial role in industrial applications. The performance of cascaded multilevel inverter (CMLI) with reduced switch count is analyzed in this paper. If the switches have been increased the switching loss and THD will increase. The preferred topology is simulated for seven level and fifteen level by considering isolated DC source and PV. The reduced % THD is identified compare to other topologies. Four switches continuously working at fundamental switching frequency is considered as one of the advantage of the topology.

In recent years multilevel inverters have been extensively worn in high voltage and high power applications for their unique performance. Reliability of the power electronic equipment is very essential to make sure that inverter operation should be stable and it is most important to detect and locate the faults as speedily as possible. This paper deals with open switch-fault finding method in a multilevel inverter using wavelet transformation tool. A fault diagnosis procedure is proposed and executed using MATLAB.

In the modern industrial drive system, power electronic converters are employed not only to control the electromechanical energy conversion process, but also facilitate energy efficiency and continued automation. In the drive system, induction motor (IM) is a preferred energy conversion device because of its inherent features. Nowadays, power converters using MLI’s playing vital role in the energy conversion process also multilevel configuration allow raising the power-handling capability of the system. Thus, in this paper fifteen level cascaded MLI fed closed loop V/f controlled IM drive is developed and its performance indicators have been analyzed for multicarrier carrier PWM strategy executed using MATLAB/Simulink.

Many wound rotor induction motor models are available in the literature. In this paper, a modified extended wound rotor induction motor model using reference frame theory is presented. State estimation of the proposed WRIM model is carried out using discrete-time extended Kalman filter (DTEKF). Rotor current sensors are required for state estimation which are usually present in all WRIM applications. Analytical simulations are carried out for a 3.7 kW four-pole wound rotor induction motor using MATLAB scientific environment-version R2016a. The results show the advantage of the proposed state estimation in realistic applications from the rotor prospective.