A. Ramesh Babu

Performance analysis of novel three phase High step-up dc-dc interleaved boost converter using coupled inductor

This paper proposes the novel three phase non isolated high voltage gain boost converter using coupled inductor. The proposed converter consists of coupled inductor based three phase switch cell network, voltage multiplier cell. The high voltage gain is obtained by recycling stored energy in inductor and voltage multiplier cell. The reduced current stress of main switch was obtained by this proposed three phase configuration. Hence conduction loss of three phase boost converter reduced compared to other conventional boost converter. The voltage stress across the switch is reduced by introduction of voltage multiplier at output. This novel three phase configuration reduce input current ripple by use of three phases at input side. The detailed analysis of proposed three phase interleaved boost converter was done by using simulation MATLAB/simulink simulation. The simulation results are presented to analyze the performance parameters of proposed converter.

Analysis of non-isolated two phase interleaved high voltage gain boost converter for PV application

This paper proposes the two phase interleaved non isolated boost converter to achieve high voltage gain for Photovoltaic (PV) application. The high voltage gain of the proposed converter increased by high turns ratio of coupled inductor. By the use of coupled inductor in input side of boost converter voltage stress across the switch reduced. The conduction loss and current stress across the switch are reduced by increasing the number of phase. Hence easy to select the power switch reduced input current ripple and output voltage ripple achieved. The primary leakage inductor energy of coupled inductor utilized efficiently. Each switch is turn on by same frequency with phase difference of 2π/2. The simulation results for non-isolated two phase interleaved high voltage gain boost converter was carried out using MATLAB/SIMULINK. The performance parameters such as voltage gain, input ripple are analyzed for single phase and two phase interleaved boost converter. Simulation results are presented to validate proposed converter.

Application of DSTATCOM for Loss Minimization in Radial Distribution System

Power system consists of three parts, first one is generation, second one is transmission, and third one is distribution. The distribution system provides electric power to end consumer. The distribution line has three configurations. They are radial, two end fed, and ring distribution system. Among them radial distribution is most commonly used which is economical and rugged system. This radial distribution system is suffers by loss. This loss can be reduced by including capacitor in the system which is discrete size and not suitable for fine adjustment and it is a passive device and has slow response. Distributed static compensator (DSTATCOM) is flexible AC transmission system (FACTS) device which is fast and continuous adjustable device. The DSTATCOM provide adequate reactive power support and reduce losses in the radial distribution system. To demonstrate the effect of DSTATCOMIEEE 33 Bus test system is considered.

Novel cascaded H-bridge sub-multilevel inverter with reduced switches towards low total harmonic distortion for photovoltaic application

ABSTRACT The main objective of this paper is to develop a novel inverter to produce multilevel output voltage. This paper proposes the cascaded H-bridge with sub-multilevel inverter (CHBSMLI) using three unequal DC sources in order to get 15-level output voltage. The unequal DC sources can be obtained from photovoltaic cell. The proposed CHBSMLI reduces the number of switches which in turn reduces the switching losses. The multicarrier sine Pulse Width Modulation (PWM) technique is proposed to obtain pure sinusoidal signal with reduced total harmonic distortion (THD). The performance analysis of the proposed three-phase CHBSMLI carried out using MATLAB/simulink with minimised THD and switching loss. The gating signals are generated using a Spartan-3E FPGA processor. The single-phase 15-level CHBSMLI with PWM developed to validate the simulation result.

Experimental investigation on the performance and emission characteristics of CI engine using waste cotton seed biodiesel with ZNO as a fuel additive

ABSTRACT The energy crisis created by depletion of fossil fuels and the toxic emissions from the fossil fuel demands for eco-friendly potential alternative sources of energy. Even though unclean, biodiesel is found to be a potential alternative for the fossil fuels. In the present work, the emission characteristics and performance of biodiesel blend with and without ZNO additive was studied. There are four biodiesel blends studied in the first part of the research and found that the B25 combination gives a better result compared to others; therefore, this blend is tested with three proportion of ZNO additive in the second part of the research. The addition of 125 PPM of ZNO to the selected B25 blends gives a better performance, the efficiency improvement is found to be 4.2% and the emission of NOx is by 10.3% under full load condition.

Novel non-isolated high step-down three phase interleaved DC-DC converter with capacitor voltage division techniques

The novel non-isolated high step-down DC-DC converter is proposed to reduce the voltage stress of main switch. The new capacitive voltage division method is used to store the input energy in input capacitors. The three input capacitors are connected across the input supply to store and release the energy to three interleaved buck converter with high step down ratio without less duty ratio. The input capacitor voltage division method will reduce the voltage stress of switch, hence easy to select the low rating switch. The low rating switch offer low on state resistance, which result in reduced conduction loss of switch. The application of interleaved PWM provides input ripple current cancellation as a result input and output current ripple get reduced. The three phase interleaved converter proposes analysis, principle of working and simulation results are presented. The proposed new method is examined under various simulation parameters are such as switching loss, conduction loss, current ripple, and voltage gain. The proposed converter simulation was done using MATLAB/Simulink environment. The presented simulation result is validated by experimental result of prototype proposed converter with 29.1 volt input 1.091 volt output.

Development of FPGA controller based high step-up DC-DC converter using coupled inductor

This paper proposes three phase high step up DC-DC converters are in need for applications, where increased loads are used. The proposed three phase DC-DC converter has with input-parallel, output series combination, accompanied by dual coupled inductors. The proposed converter inherits the advantage of being used in three phase applications, compared to the conventional converter. At the input, the presence of the paralleled dual coupled inductors shares the input current. The prototype circuit of the conventional converter has been modified by The prototype The proposed three phase converter has a rating of about 100 W output power at a switching frequency of about 40 kHz and satisfactory agreement between experimental and theoretical analysis has been observed. An output voltage of about 295 V has been harvested.