Rakesh Saxena

Solar PV stand-alone water pumping system employing PMSM drive

This paper deals with the stand alone solar PV (Photo Voltaic) supplied PMSM (Permanent Magnet Synchronous Motor) drive for water pumping system. An interlink Boost converter is used between solar PV panel and DC bus of PMSM drive. The DC bus voltage of PMSM drive is maintained constant by controlling the duty cycle of boost converter. Three phase VSI (Voltage Source Inverter) is controlled to supply PMSM under change in solar irradiation to regulate discharge of water. Solar PV stand-alone water pumping system employing PMSM drive is modelled in MATLAB/SIMULINK environment using the sim power system toolboxes. The performance of the proposed system is obtained under wide variation in PMSM speed with change in solar irradiation.

Experience in the design optimization of a voltage source inverter fed squirrel cage induction motor

Abstract The paper deals with the design optimization of a voltage source inverter (VSI) fed squirrel cage induction motor. A set of nine independent variables is selected and to make the machine feasible and practically acceptable certain constraints are imposed on the design. Different objective functions are considered, namely, the active material cost, operating cost, a mixed objective function of the active material cost and operating cost, and the torque pulsation, to facilitate a suitable design for a given application. In this investigation the sequential unconstrained minimization technique (SUMT) with interior penalty function approach in conjunction with Rosenbrocks method of rotating coordinates is used to optimize the design. The optimized design results of a 7.5 kW, delta-connected, voltage source inverter fed cage motor are given and discussed in detail.

Modeling and Simulation of BLDC Motor Using Soft Computing Techniques

In this paper a soft computing technique PSIM is used for the performance simulation of the BLDC motor. With the help of its user friendly approach and some basic theories, the corresponding PSIM models for the BLDC can easily be constructed. The simulation results of BLDC motor performance can critically evaluate under various input parameters in the PSIM environment. The accuracy of this approach can also be verified by comparing the simulation results in PSIM with the response obtained from the BLDC motor established results.

Comparative study of different residential illumination appliances based on power quality

The main emphasis of this paper is on the power quality based comparison of different house hold illumination appliances. An attempt has been made to measure the THD of different illumination system i.e. Incandescent lamp, Fluorescent Lamp with magnetic and electronic ballast, Compact fluorescent lamp (CFL) and Light Emitting diode (LED). All above illumination system were used for experimental work. An experimental set up were developed to measure THD. The total THD of all the system will affect the power system as a whole. Also the comparative study of basic power quality aspect measured is wattage, luminous performance and power factor of different types of illumination system. The various energy savings fluorescent lamps with core-coil and solid-state ballasts were studied. Fluorescent lighting incorporating solid-state ballasts revealed a larger harmonic content, in the measured current with odd multiples of the fundamental frequency than that obtained for lighting systems equipped with core-coil ballasts. The scope of the proposed work is to focus the harmonics contents from various modern residential illumination system, which deteriorate the power quality.

Measurement of Flux Linkage and Inductance Profile of SRM

389 Abstract— The main goal in modeling of SRM is to provide a good accuracy over the entire speed and torque range. This paper introduces significant physical phenomenon that needs to be included in a realistic model of the SRM. The proposed methodology is applied on submersible pump switched reluctance motor for measurement of flux linkage and inductance of phase winding. Experimental results are well accurate for modeling and performance analysis of proposed SRM.

PERFORMANCE ANALYSIS OF LOAD COMMUTATED INVERTER FED CAGE INDUCTION MOTOR DRIVE

ABSTRACT An approach, to analyse the performance of a variable speed cage induction motor drive fed from load commutated inverter (LCI), is presented. Induction motor with an appropriate capacitor across its stator terminals constitutes the load on the inverter. A fully controlled bridge converter, supplied by a variable dc voltage source, commutated with the back emf of the motor, acts as an inverter. An algorithm to compute the motor performance, is developed using equivalent circuit representation of the system. Strategies for the selection of control variables, in order to achieve the desired speed range for satisfactory performance of the drive are given. The performance of a 3-hp, cage induction motor fed from LCI is computed, using the developed algorithm for wide range of speed; and is verfied experimentally.

Digital control technologies for improving the power quality of power supplies

The power supply designs are becoming digital in nature due to its several advantages. It is common to see what would have once been a completely analog design, now incorporate some combination of DSP, microcontroller, and FPGA technologies. The current harmonics are measured in power supply of color television. This paper presents the digital control technologies and simulation techniques that have been developed to greatly reduce the input filter requirements for converters. The input filter’s inductor size and the capacitor size can be reduced while maintaining the same power quality specifications of the power supplies. The paper also deals with VHDL codes and FPGA modules for PWM generator.

Analysis of a modified positive output Luo converter and its application to solar PV system

The modified positive output Luo converter is a type of a high-gain DC-DC converter. It is derived from the positive output Luo converter. This topology uses combination of inductors and capacitors to lift the input voltage to a higher value of the output voltage. The voltage gain of the converter in a re-lift configuration is two times of that provided by a boost converter while using a single switch. In this paper, the steady state analysis of the re-lift configuration of the modified positive output Luo converter operating in the continuous conduction mode is presented and the relevant expressions are derived. The possible application of this converter as one of the stages in a single phase transformer-less grid integrated solar PV system is suggested. Simulation results are presented to support the theoretical analysis.

Photo-voltaic system for refrigeration plants in isolated areas

This paper presents design and modeling of quasi resonant ZCS (Zero Current Switching) converter used in standalone PV based PMSM (Permanent Magnet Synchronous Motor) drive used in refrigeration system for remote locations. Solar cooling is an attractive and plentiful in the nature application, due to cooling demand match with the peak incident solar radiation. Three phase vector controlled VSI (Voltage Source Inverter) is employed for supplying the PMSM drive with variation in solar irradiation. MATLAB/SIMULINK environment is used to developed the proposed quasi resonant converter fed standalone PV based PMSM drive. The performance of developed system is investigated under various operating conditions.

Direct torque and power controlled pmsm drive

This paper presents design and modeling of Direct Torque Control (DTC) and Direct Power Control (DPC) four quadrant Permanent Magnet Synchronous Motor (PMSM) drive. Three phase Insulated Gate Bipolar Transistor (IGBT) based Voltage Source Converter (VSC) is used as an Improved Power Quality Converter (IPQC) for power control from supply system at DC link. Three phase Voltage Source Inverter (VSI) is employed with DTC scheme for supplying the PMSM. To control an IPQC, a modified DPC scheme based on three level and two level hysteresis controllers is designed to get a power factor close to unity with minimum Total Harmonic Distortions (THDs) of the supply currents. MATLAB/ SIMULINK environment is used to model the proposed PMSM drive. The proposed drive system is investigated under wide variations in PMSM reference speed and loading.