Since last decades, the pulse width modulation (PWM) techniques have been an intensive research subject. Also, different kinds of methodologies have been presented on inverter switching losses, inverter output current/ voltage total harmonic distortion (THD), inverter maximum output of DC bus voltage. The Sinusoidal PWM is generally used to control the inverter output voltage and it helps to maintains drive performance. The recent years have seen digital modulation mechanisms based on theory of space vector i.e. Space vector PWM (SVPWM). The SVPWM mechanism offers the enhanced amplitude modulation indexes (MI) than sinusoidal PWM along with the reduction in the harmonics of inverter output voltage and reduced communication losses. Currently, the digital control mechanisms have got more attention than the analog counterparts, as the performance and reliability of microprocessors has increased. Most of the SVPWM mechanisms are performed by using the analog or digital circuits like microcontrollers and DSPs. From the recent study, analysis gives that use of Field Programmable Gate Arrays (FPGA) can offer more efficient and faster solutions. This paper discusses the numerous existing research aspects of FPGA realization for voltage source inverter (VSI) along with the future line of research. Keyword:Analog circuits Digital circuits Copyright © 2018 Institute of Advanced Engineering and Science.All rights reserved. Corresponding Author:Shalini Vashishtha, Visvesvaraya Technological University, Belagavi, India. Email:-shaliniv.vtu@gmail.com INTRODUCTIONThe concepts of PWM are turning out to be increasingly prevalent in today's motor drives. In the inverters, PWM makes it conceivable to control both the frequency and magnitude of the current and voltage connected to a motor. Along these lines, PWM for motor drives offers better efficiency and higher performance contrasted with fixed frequency motor drives. PWM systems have been the subject of serious research amid the most recent couple of decades. The PWM techniques have been the intensive research subject. Also, different kinds of methodologies have been presented on inverter switching losses, inverter output current/ voltage THD, inverter maximum output voltage of DC bus voltage [1].The sinusoidal PWM is utilized to control the output current/voltage of the inverter and keeps up a better performance of the drive in the whole operational range between 0-78percent of the value that would be come to by square operation. In the event that the MIs surpass this value, straight relationship amongst MI and output voltage is not kept up, and the over modulation techniques are required. As of late, a characteristically advanced modulation system known as SVPWM which depends on space vector hypothesis [2]. It has been accounted for that SVPWM mechanisms offers better performance over different methods regarding torque ripple, better DC link utilization, lower THD, switching loss and easier digital system
In this paper, we have proposed an effective hybrid partial transmit sequence (EHPTS), which addresses the problem of peak-to-average power ratio (PAPR) in a reconfigurable high-speed multi-input, multi-output orthogonal frequency division multiplexing (RHS-MIMO-OFDM) technology and efficiency minimizes PAPR in orthogonal frequency division multiplexing (OFDM).But the PTS technique needs to analysis all the probability of phase rotation factors which results in increases of mathematical model computation complexity grows exponentially with the increase of various subcarrier and sub-blocks. To reduce the analysis complexity, we propose a method mainly operated on to select the optimized phase factors to reduce the high PAPR. The proposed RHS-MIMO-OFDM system incorporated the novel local analysis operations that are designed and implemented to explore the optimum phase factors. The results of the simulation show that the proposed EHPTS method are reduced PAPR effects on OFDM system when it compared to the conventional PTS techniques (U = 4).
The power generation using solar photovoltaic (PV) system in microgrid requires energy storage system due to their dilute and intermittent nature. The system requires efficient control techniques to ensure the reliable operation of the microgrid. This work presents dynamic power management using a decentralized approach. The control techniques in microgrid including droop controllers in cascade with proportional-integral (PI) controllers for voltage stability and power balance have few limitations. PI controllers alone will not ensure microgrid’s stability. Their parameters cannot be optimized for varying demand and have a slow transient response which increases the settling time. The droop controllers have lower efficiency. The load power variation and steady-state voltage error make the droop control ineffective. This paper presents a control scheme for dynamic power management by incorporating the combined PI and hysteresis controller (CPIHC) technique. The system becomes robust, performs well under varying demand conditions, and shows a faster dynamic response. The proposed DC microgrid has solar PV as an energy source, a lead-acid battery as the energy storage system, constant and dynamic loads. The simulation results show the proposed CPIHC technique efficiently manages the dynamic power, regulates DC link voltage and battery’s state of charge (SoC) compared to conventional combined PI and droop controller (CPIDC).
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