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Sivakumaran, T. S.
- Implementation of FPGA based DPWM-Digital PI Closed Loop Controller for Voltage Regulation
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Authors
Affiliations
1 Department of Electronics and Instrumentation Engineering, Annamalai University, Annamalai Nagar, Chidambaram - 608002, Tamil Nadu, IN
2 Department of Electrical and Electronics Engineering, Arunai Engineering College, Velu Nagar, Tiruvannamalai - 606603, Tamil Nadu, IN
1 Department of Electronics and Instrumentation Engineering, Annamalai University, Annamalai Nagar, Chidambaram - 608002, Tamil Nadu, IN
2 Department of Electrical and Electronics Engineering, Arunai Engineering College, Velu Nagar, Tiruvannamalai - 606603, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 38 (2016), Pagination:Abstract
Objectives: In this paper, a Field Programmable Gate Array (FPGA) based real time implementation of a closed loop controller for regulating the load voltage under line and load disturbances by generating Digital Pulse Width Modulation (DPWM) is developed. Digital Proportional Integral (DPI) controller is designed to generate the DPWM. Methods: DPWM are developed by two methods: Counter based and Delay line based. The closed loop DPWM activated DC-DC buck converter is simulated using MODELSIM and tested in real time using Xilinx Spartan 3A DSP FPGA. Findings: Hardware results show the regulated load voltage by updating the DPWM control signal duty cycle to compensate the line and load disturbances. FPGA based DPWM provides less complexity in design. Improvements: Hybrid based DPWM method with closed loop control for DC-DC Buck converter could be used for voltage regulation.Keywords
Closed Loop Controller, Digital PI, DPWM, FPGA.Full Text
- Analysis of Asymmetrical Cascaded Multi-Cell Multilevel Inverter Employing Multicarrier Level Shifting PWM Technique on Different Loads
Abstract Views :143 |
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Authors
Affiliations
1 Bharath University, Chennai, IN
2 Department of EEE, Arunai College of Engineering, Tiruvannamalai, Tamil Nadu, IN
1 Bharath University, Chennai, IN
2 Department of EEE, Arunai College of Engineering, Tiruvannamalai, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 31 (2016), Pagination:Abstract
Background: Multilevel inverters are very exciting alternative for intermediate and other high power drives. The Multicell group is widely growing owing to its advantages such as simplicity in circuit configuration with modularity and expandable. This paper proposes a new circuit configuration of 15 level cascaded H bridge Multicell Inverter which is the mixed form of flying capacitor and cascaded group. Methods: This work suggests a novel structure of new multilevel multicell inverter. The conventional structure uses two positive switch and two negative switch. Here the proposed inverter uses only one positive switch and only one negative switch. The circuit with one DC voltage along with one positive and negative switch forms a cell. Interconnection of more than one cells form multicell structure which is used to generate multilevel output. This multilevel inverter uses asymmetric voltage sources to produce multiple levels at the output. Here, Level Shifting Pulse Width Modulation (PWM) system is used to generate the switching signals to the inverter. Findings: The simulation of the proposed work shown with few number of semiconductor switches, is capable of achieving 15 levels at the output. Incorporating the Level Shifting PWM technique, the Total Harmonic Distortion (THD) has been reduced. Application: The proposed Multicell Multilevel inverter is used to drive the induction motor. Further controllers like PI, Fuzzy and Neuro can be added to reduce the THD and to develop the power quality.Keywords
Asymmetric Voltage Sources, Level Shifting Pulse Width Modulation (LSPWM), Multicell, Multilevel Inverter, Total Harmonic Distortion (THD).Full Text