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This paper presents a novel GaN switching power device-based DC-AC converter using Heterodyne Technique. Compared with the traditional DC/AC converters, the proposed converter has a simpler circuit topology with less number of high speed switching devices, thus making more efficient and cost-effective converter with reduced size and weight. By the aid of Heterodyne Technique, DC power is converted...
Multilevel inverter technology has emerged recently as a very important alternative in the area of high power energy control. Number of topologies have been introduced and widely used in drive applications. Among these topologies, the cascaded H-Bridge inverter is used in this paper because of its advantages over other topologies. Different control techniques are available to control these inverter...
This paper presents a diagnostic study on the regular sampled Space Vector PWM (SVPWM) for sub-harmonics, when operated with fractional carrier ratios in variable frequency applications. Also a modified approach is proposed for refinement of the harmonic profile of SVPWM with a low computational dynamic sampling and carrier generation. When inverters are operated at fractional fundamental frequencies...
Development of renewable energy has become crucial for the global warming and shortage of fossil fuel. Solar energy is one of the promising renewable energy to meet the energy crisis. One of the big disadvantage of solar array is the efficiency level remains between 14%–25%. So maximum power extraction and reduction of associate losses is a challenge for the researchers. Multilevel inverters are being...
In recent years, as an eco-friendly EV charging system, the wireless charging has become a topic due to the merits such as convenient, safety, and clean. In this paper, in order to realize a large-gap wireless charger which can communicate between the power feeding and receiving units without any additional communication device, a wireless power transfer (WPT) system using a single-ended push-pull...
This paper reports the design, simulation, hardware implementation and testing of a sinusoidal pulse width modulation (SPWM) based single-phase voltage-source sine-wave inverter. SPWM is a promising method of switching for motor drive control and inverter applications. In this development, we implemented the bipolar SPWM voltage modulation scheme as this method, compared to the unipolar scheme, offers...
This paper presents a simplified sinusoidal pulse width modulation (SSPWM) proposed to control a half-bridge multilevel inverter. This topology has less number of switching components compared to conventional types of multilevel inverter. It can be supplied from separated dc sources or renewable energy sources like solar energy via photovoltaic modules. This topology can be a symmetric or an asymmetric...
In this study, a modified carrier is proposed to generate PWM gating signal. Proposed PWM method reduces total harmonic distortion (THD) of the output voltage of inverter up to 5.8% than the traditional triangular carrier based PWM. Major harmonic components in output voltage are less in magnitude when proposed PWM technique is applied to inverter. Fundamental component of output voltage is also higher...
A modified multilevel inverter (MLI) structure has been presented for Photovoltaic (PV) fed 2.3 kV micro-grid applications. To feed the cascaded multilevel micro-grid connected inverter (CM-MGCI) voltage, a PV array is designed considering the environmental effects of Bangladesh. We have estimated the performance of the classical and a modified cascaded H-bridge (CHB) MLI with level-shifted carrier...
This paper presents two novel modulation schemes for a bidirectional single phase inverter with a high frequency link. The topology with the proposed modulation scheme can be used for the grid integration of renewable energy sources like photovoltaic and fuel cell, energy storage system, hybrid and electrical vehicle, vehicle to grid (V2G) integration, uninterruptible power supply (UPS) system. The...
Impedance source converters, are very fast growing technology for electrical energy conversion and particularly appropriate for distributed energy generation. These network avoid limitation associated with traditional voltage and current source converter by adding additional state, called as shoot-through state. These shoot-through states can be controlled by various control methods and pulse width...
This research work is organized in two sections. Performance comparison of single phase half bridge inverter and single phase full bridge inverter is done in the first section. It is observed the output current and output voltage of full bridge inverter is twice and generates less total harmonic distortion as compared to half bridge inverter. In the second section, performance comparison of Unipolar...
This work presents the FPGA design of a DC/AC pulse width modulated converter for teaching purposes. The design allows to change in real time the PWM modulation scheme, the amplitude and frequency of the desired first harmonic, as well as the harmonic spectrum depending on the requirements of the application. Therefore, a teaching platform to be used in practices related to power electronic subjects...
A new strategy for controlling single-phase dual-active-bridge converter is proposed in this paper. It is realized by employing dynamic control of the direct and quadrature current components, detached from the transferred current. The direct component Id is determined approximately from the terminal current, whereas, the quadrature one, Iq, is estimated by a reduced-order observer. All the models...
This paper presents a single-phase seven levels cascaded and asymmetric-bridge inverter for grid-connected photovoltaic system with non-linear power load. The asymmetric cascaded H-bridge inverter appears to be the perfect candidate for photovoltaic applications; thanks to its modularity, scalability and distributed maximum power point tracking possibility. However the power mismatch from cascaded...
This paper presents the analyses and design of a GaN device based differential-mode Cuk inverter (DMCI). The DMCI follows a hybrid modulation scheme (HMS) that introduces discontinuity in modulation or yields topological switching, which results in enhanced energy conversion efficiency. Owing to very small device capacitance and high dv/dt of GaN devices, it becomes crucial to limit the leakage inductance...
Multi-frequency wireless power transfer (WPT) is advantageous in facilitating compatibility with different WPT standards. However, implementing a multi-frequency transmitter often requires compromises in system size, complexity, power transfer capability, or output regulation. In this paper, a single-inverter based dual-mode WPT system is proposed. The system employs a multi-frequency programmed pulse...
This paper presents an implementation technique of a high resolution Unipolar Pulse Width Modulator (UPWM) for power inverter applications. Unipolar switched inverter has the advantage of a higher efficiency and lower harmonic distortion. The technique was tested in a 2kW inverter with a typical LC filter and it was achieved a Total Harmonic Distortion below 2%. Simulations and experimental results...
The article aims to investigate the influence of sub-modulating function form to the harmonic structure of output voltage and coefficient of power-supply voltage use in the systems with multilevel inverters. Comparative analysis for different types of modulation and different sub-modulating functions shows the advantage of multi-level inverter with APWM.
This manuscript presents modified scheme of synchronous space-vector modulation allowing providing nonlinear dependences between the fundamental voltage and fundamental frequency of dual three-phase open-winding ac drive with four modulated inverters. Behavior of the system with six control modes (characterized by different dc-voltages and switching frequencies of inverters) and two nonlinear Voltage/Frequency...
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