Informatics Publishing Limited

R. Palanisamy ¹, K. Vijayakumar ¹, K. Selvakumar ¹, D. Karthikeyan ¹, G. Santhoshkumar ¹

Affiliations
1 Department of EEE, SRM University, Chennai – 603203, Tamil Nadu, IN

Abstract

Objectives: This paper illuminatessimulation and modelling of 5-level single phase Z-source based cascaded scheme inverter and its progress for output voltage twice the applied input voltage. Methods/Analysis: Z-source network utilizes a unique impedence network (L-C) combinations to connect with 5-level cascaded inverter, which gives unique features that cannot be obtained from the conventional inverter citcuits. Z-source network trounce the various restrictions of conventional voltage source inverter and current source inverters like reduced losses, voltage stress, improved output voltage. By using the shoot-through conditions the duty ratio of the proposed system can be speckled to achieve better output source voltage compare to conventional methods. This method is imitation using matlab - simulink with experimental results are verified using dsPIC controller. Findings: Z-source cascaded type H-bridge inverter facilitates to boost functional source voltage without any conservative dc - dc boost converters. The output source voltage of the planned system increased twice that of conventional inverter system and better current control is achieved.SPWM technique used to contorl the power switches placed in the proposed system. Novelty/ Improvement: The total harmonic level in the proposed system diminished and voltage stress in the each power switches also reduced. The method keeps away from the convention of dc/dc converter, diminishes the expenditure of the scheme and reduces voltage stress in the switches.

Keywords

Cascaded Type H-Bridge Inverter (CHBI), Matlab/simulink, Sinusoidal based Pulse Width Modulation (SPWM), Z-source Network.

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R. Narayanamoorthi ¹, A. Vimala Juliet ¹, G. Santhoshkumar ¹, K. Selvakumar ¹

Affiliations
1 Faculty of Engineering and Technology, SRM University, Kattankulathur - 603203, Tamil Nadu, IN

Abstract

Objective: The main theme of this paper is to eliminate the frequency split in short range Wireless Power Transfer (WPT) system by magnetic resonance coupling. Analysis: The common basic two coils based magnetic resonance WPT system is taken for the analysis; the frequency and transfer coefficient are plotted for different dimensions of the coil. Using genetic algorithm, the lumped impedance parameters are determined, which is used for the tuning of the active matching circuit. Based on the experimental results it has been observed that the frequency split can be eliminated by tuning the matching circuit properly for the corresponding distance and higher efficiency can be achieved for short range. Findings: The frequency split elimination techniques can be used in dynamic transmitter and receiver wireless charging system. Application: This system can be employed in short range wireless power transfer such as neural implants, capsule robots, micro-robots and electric vehicle charging and so on.

Keywords

Maximum Energy Efficiency, Magnetic Resonance, Wireless Charging.

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R. Palanisamy ¹, K. Vijayakumar ¹, K. Selvakumar ¹, D. Karthikeyan ¹, G. Santhoshkumar ¹

Affiliations
1 Department of EEE, SRM University, Chennai - 603203, Tamil Nadu, IN

Abstract

Objectives: The implementation of five phase three level Neutral Point Clamped (NPC) inverter is illustrated using space vector modulation technique based on the optimized five vectors switching strategy. Methods/Analysis: In 5 phases 3 levels NPC inverter consists of 243 switching state vectors, which can be reduced to 113 states by optimized Space Vector Modulation (SVM) switching strategy. The system has 11 sectors, which is converted into 6 sectors in that sub regions can be identified by optimised technique in d-q voltage vector. Simulation results of the five phase three level neutral point clamped inverter using SVM verified using Matlab/Simulink. Findings: SVM utilities switching states among the available various redundant states to reduce the common mode voltage and capacitor balancing problem. Dwell time calculations for this proposed does not need of any lockup table and park transformation. It’s applicable for high power medium voltage, remote sensing and industrial applications. Novelty/Improvement: The 3level 5phase NPC inverter has improved power density of the machine, enhanced dissection of power source among the inverter legs, abridged amplitude and augmented frequency of the torque pulsation than the traditional inverters.

Keywords

Neutral Point Clamped Inverter (NPCI), Optimised Space Vector Modulation (OSVM), Pulse Width Modulation Method (PWM), Switching States.

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R. Narayanamoorthi ¹, A. Vimala Juliet ¹, G. Santhoshkumar ¹, K. Selvakumar ¹

Affiliations
1 Faculty of Engineering and Technology, SRM University, Kattankulathur-603203, IN

Abstract

Objective: The main theme of this paper is to analyze the wireless power transfer system efficiency in real time with different medium, distance and angle between the source and load coil. Analysis: The transmitter side of Wireless Power Transfer (WPT) system connected to the supply and receiver side is connected with load. The analysis is carried out for 2, 3 and 4 coil system in experimental test setup. Based on the experimental results it has been observed that the 4 coil WPT system gives better performance as compared with other two. Also it shows higher efficiency, if the angle of orientation of the load coil is small with the source coil.Findings: The four coil WPT system can be used in low power wireless charging devices with the distance of 3 to 15c.m between transmitter and receiver. Application: This system can be employed in electric vehicle charging, Bio implants, microrobots and so on.

Keywords

Magnetic Resonance, Maximum Energy Efficiency, Wireless Charging.

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