V. Jamuna

Development of Matlab Simulink model for photovoltaic arrays

This paper presents the mathematical model for a photovoltaic array. It has been developed with the help of Matlab/Simulink software package. Since the PV module has non linear characteristics, it is necessary to model it for the design and simulation of maximum power point tracking (MPPT) for PV system applications, and to study the dynamic analysis of converters. This model of photovoltaic array is user-friendly. The developed model is simulated and analyzed in conjunction with power electronics, for a maximum power point tracker. The parameters of the photovoltaic array model are obtained from the information available in the datasheet. The same is also explained in this paper.

Digital simulation of multicarrier PWM strategy for multi-level inverter

This paper presents a design of a Multi-Carrier Pulse Width Modulation (MCPWM) Strategy for an eleven level inverter. The emergence of multilevel inverters (MLI) has increased since the last decade. They are suitable for high voltage and high power applications, due to their ability to synthesize waveforms with a better harmonic spectrum. Numerous topologies have been introduced and widely studied, for utility and drive applications. Multi-level inverters are commonly modulated, by using multicarrier pulse width modulation techniques, such as phase-shifted multicarrier modulation, and level-shifted multicarrier modulation. Amongst these, the level-shifted multicarrier modulation technique produces the best harmonic performance. This work studies a multilevel inverter with equal DC sources, using the level shifting MCPWM technique. By applying this concept, harmonics can be eliminated, and in the output voltage, the Total Harmonic Distortion (THD) can be improved. A procedure to achieve the appropriate level shifting is presented in this paper.

Single Phase Matrix Converter as an ‘all silicon solution’

This paper presents the SPMC topology which offers many advantages with unrestricted switch control or with minimal reactive device use, as an all silicon solution. It elucidates the implementation of SPMC as an inverter and as a Controlled Rectifier. Also, with proper switching control algorithm, a type of converter that can buck and boost with step-changed frequency called a Single-Phase Z-Source Buck-Boost Matrix Converter is proposed. It employs a safe-commutation strategy which results in the elimination of voltage spikes on switches without the need of a snubber circuit. The operating principles of this converter for all these configurations are described and the circuit behaviour is confirmed by MATLAB / Simulink simulation results.

Digital simulation of single and interleaved soft switching boost converter for PV

In this paper an interleaved soft switching boost converter (ISSBC) for a photovoltaic power generation system is presented. This topology uses a resonant soft switching technique and hence the switching losses are minimized. Performance comparison is made between a single switch soft switching boost converter (SSSSBC) and the ISSBC converter. It is proved that the ISSBC topology is superior to the SSSSBC topology. The simulation is performed using MATLAB the Simulink package.

Voltage control scheme for three phase SVM inverter fed induction motor drive systems

This paper presents an efficient implementation scheme for the closed-loop voltage control of an induction motor incorporating ‘Space Vector Pulse Width Modulation (SVPWM)’. Voltage control is required to meet the variation in the input voltage and to regulate the output of the inverter. Space Vector Modulation (SVM) is an algorithm for the control of Pulse Width Modulation (PWM). SVM gives better harmonic response and higher efficiency compared to pulse width modulation techniques.

Dynamic analysis Of positive output super lift converter

In this paper the state space averaging technique is applied for positive output super lift Luo converter and the transfer function is obtained. In voltage lift technique, the output voltage increases in each stage along in arithmetic progression. Super lift technique has been developed which implements the output voltage increasing stage by stage along in geometric progression. The elementary circuit and relift circuit are simulated using MATLAB and hardware result for re-lift circuit is presented.

A New Approach for Torque Ripple Minimization of PMBLDC Motor Drive

This objective of this paper is to minimize the torque ripple content of Permanent Magnet Brushless DC motors (PMBLDC) by using an Asymmetric Cascaded Multilevel Inverter (ACMI). Torque ripple reduction in BLDC motor has been main concern of the drive system. The BLDC motor is fed from the Asymmetric Cascaded Multilevel Inverter where the rotor position is the input. The proposed system is an effective replacement for the conventional method, which has a high torque ripple. The usage of BLDC enhances various performance factors ranging from higher efficiency, high power density, and low maintenance and less noise. This paper presents a mathematical model of BLDC motor and shows the values of various technical parameters using MATLAB/SIMULINK.

Control of Three Phase to Three Phase Matrix Converter—A Direct Transfer Function Approach

In recent years, Matrix converters have received enormous attention, due to their power control capability. They are capable of providing simultaneous transformation of amplitude and frequency of a three phase system. They are simple in structure and use bidirectional switches. In this paper the direct transfer function method is proposed to create variable voltage and variable frequency output and the same is simulated using MATLAB/SIMULINK simulation software.

Power Quality Problems in PV Fed Grid Connected Inverter

—– In this paper, problem faced by grid connected pv inverter is presented. Inverters connected to grid are mostly affected due to short circuit problems in the power systems. Therefore it is essential to analyze power quality disturbances in order to improve the quality of the system. Performance of inverter is affected severely by voltage sag compared to other type of power quality disturbances. Also in this paper, multilevel inverter with sag condition and without sag condition is simulated using MATLAB/SIMULINK software

Simulation and Modeling of SVM Based WECS with PMSG Using Cuk Converter

This paper presents the modeling and simulation of PMSG based wind energy conversion systems (WECS) using MATLAB Simulink. This model contains the wind turbine, PMSG, diode rectifier, DC–DC converter (Buck – Boost) and SVPWM based inverter. Due to the wind fluctuations, output voltage varies continuously. Cuk Converter can be controlled to maintain the constant DC voltage. The SVPWM based inverter can be used to produce the constant output voltage with constant frequency for the stand alone load (Remote locations, Island, Hills Stations etc). The simulation results show that the developed model complies with the theoretical results. The controller maintains constant output voltage .