Ranganath Muthu

Mathematical modeling of photovoltaic module with Simulink

This paper presents a unique step-by-step procedure for the simulation of photovoltaic modules with Matlab/ Simulink. One-diode equivalent circuit is employed in order to investigate I-V and P-V characteristics of a typical 36 W solar module. The proposed model is designed with a user-friendly icons and a dialog box like Simulink block libraries.

Application of Circuit Model for Photovoltaic Energy Conversion System

Circuit model of photovoltaic (PV) module is presented in this paper that can be used as a common platform by material scientists and power electronic circuit designers to develop better PV power plant. Detailed modeling procedure for the circuit model with numerical dimensions is presented using power system blockset of MATLAB/Simulink. The developed model is integrated with DC-DC boost converter with closed-loop control of maximum power point tracking (MPPT) algorithm. Simulation results are validated with the experimental setup.

Comparison of Cascaded H-Bridge, Neutral Point Clamped and Flying Capacitor multilevel inverters using multicarrier PWM

Multilevel Inverters are becoming popular for their high voltage operating capability for high power applications. This paper presents a comparative study of Cascaded H-Bridge, Neutral Point Clamped and Flying Capacitor multilevel voltage source inverters. These five-level inverters are simulated in MATLAB/ Simulink using multi carrier sine pulse width modulation. FFT analyses of output voltages for an RL load is carried out. The advantages of Cascaded H-Bridge inverter over the other two types of inverters are brought out in this paper.

Elimination of common mode voltage using phase shifted dual source matrix converter with improved modulation index

Purpose – The high-frequency common-mode voltage introduced by power converters, using conventional modulation techniques, results in common-mode current that has the potential to cause physical damage to the shaft and bearings of electric drives as well as unwanted tripping of ground fault relays in motor drives and electrical networks. The paper aims to provide a complete elimination of common mode voltage using a matrix converter (MC) with a new modulation strategy that reduces the size of the power converter system considerably. Further, a new MC topology is proposed to eliminate the common mode voltage with improved voltage transfer ratio (VTR). Design/methodology/approach – The direct MC topology is selected, as it is the only converter topology that has the potential to eliminate common mode voltage in direct AC to AC systems. Using the rotating space vector technique, common mode voltage is eliminated but this reduces the VTR of the converter. To improve the VTR, a modified MC topology with a modi...

Viability analysis on photovoltaic configurations

Energy research is basis for wealth creation that leads to successful societal transformation. PV systems play important role in sun energy extraction process. The different PV system configurations are compared on the basis of operational difficulties in the life long energy recovery processes of the module with a view of efficiency improvement and cost reduction. Significance of grid-connected PV Systems in the sun energy extraction process is presented.

Drug infusion control for mean arterial pressure regulation of critical care patients

Postoperative hypertension is a common but a critical parameter observed in patients recovering in critical care units. This parameter is well indicated by the measurement of the hemodynamic variable, the mean arterial pressure (MAP). The MAP is regulated by the infusion of vasoactive drugs like sodium nitroprusside (SNP). This would be time-consuming if carried out manually, hence the need to automate this setup. This paper proposes a closed loop system with a model predictive controller, which will react automatically to the changes in the patients state and trigger drug infusion to maintain the MAP at the required set value. It was found that the proposed controller was able to track the set point changes and keep the MAP within the required values.

An Overview of Maximum Power Point Tracking Techniques for Wind Energy Conversion Systems

This paper presents on overview of maximum power point tracking (MPPT) techniques for different types of wind energy conversion systems (WECS). In order to obtain maximum power from the wind turbine (WT), variable speed wind energy conversion systems (VSWECSs) are preferred over constant speed wind energy conversion systems (CSWECSs).In VSWECS, the rotational speed of the turbine is varied by controlling the aerodynamic or electrical parameters of WECS to maintain a constant tip-speed ratio (TSR). This is called maximum power point tracking and different techniques are applied to WECS namely Squirrel Cage Induction Generators (SCIGs) based WECS, Permanent Magnet Synchronous Generators (PMSGs) based WECS.

Modeling and simulation of D-STATCOM for voltage regulations

This paper gives the State Space modeling of Distribution Static Synchronous Compensator (D-STATCOM). It is important to keep the voltage constant in the distribution system, hence voltage regulation is required in the distribution network. Voltage Source Converter (VSC) based D-STATCOM achieves voltage regulation in the connected bus by absorbing/supplying the required reactive power. The capability of the DSTATCOM is demonstrated by simulation using MATLAB.

Doubly fed induction generator for wind energy conversion system - A survey

This paper surveys the doubly-fed induction generator (DFIG) used in wind energy conversion systems (WECS). Most of the present day WECS is the variable speed type. The variable speed WECS generators are: synchronous generator (SG), permanent magnet synchronous generator (PMSG), wound rotor induction generator (WRIG) and DFIG. Of these, the DFIG is finding increasing attention in the use of WECS because of its requirement of partial rated converters and complete control of active and reactive power transferred.

Matrix Converter Switching Strategy for Abnormal Voltage Conditions using Selective Harmonic Tracking Algorithm

Abstract A dynamic space vector modulation (SVM) approach for matrix converter operation in unbalanced and non-sinusoidal input voltage condition is presented. The concept of varying the modulation index based on the output of the selective harmonic tracking algorithm with reference to the fictitious DC bus is introduced. The complex relationship between output voltage and input voltage vectors of matrix converter for unbalanced and non-sinusoidal conditions is avoided using selective harmonic tracking algorithm. Using the oscillating fictitious DC bus vector, a simplified SVM approach is proposed to operate the matrix converter under extreme input voltage conditions. This approach is based on simple compensation of the output voltage modulation vector with respect to the oscillating fictitious DC bus vector. The unbalanced and non-sinusoidal input voltages are automatically compensated so that the output voltage is balanced and sinusoidal with minimum compromise in the sinusoidal nature of input current. The validity of the selective harmonic tracking algorithm approach is verified through simulation.