'", DECLARATION. ')C,jC'/ (()\..,c'l

Transcription

1 DECLARATION The work submitted in this dissertation is the result of my own investigation, except where otherwise stated. It has not already been accepted for any degree, and is also not being concurrently submitted for any other degree. ji,c),:) < }, <c',/ I P. R. D. Dayananda I endorse the declaration by the candidate. "'~ \ \ (., -. _i \ (. \(- -- '\:.:: '", Dr. Sisil Kumarawadu ')C,jC'/ (()\..,c'l 11

2 CONTENTS IlECLARATION... I I ABSTRACT... V A.CKNOWLEDGMENTS... VI LIST OF FIGURES... VII 1. INTRODUCTION Background and Motivation Importance of the project... ] 1.3 Organization of the report Objectives Background Study V IF control Mechanism Six Step and Sinusoidal PWM Generation OVERVIEW OF THE PROJECT Project Life Cycle Project timeline Design Requirements Calculations Required Variac Calculation... R 2.5 Frequency Selection Component Selection Selection of IGBT Module Converter Selection Object Oriented PIC (OOPic) F767 Microcontroller IR21094 IC... ll 2.7 Heat Sink Design IMPLEMENTATION Main Control Circuit Six Step Inverter Design Implementation of Six Step Algorithm in the system PWM Techniques Sinusoidal PWM method Implementation of sinusoidal PWM in the system Control Algorithm of sinusoidal PWM Acceleration and Deceleration Program Flowchart Driver Circuit ofigbt Module Introduction Drive Circuit Design Designing protection circuits Consideration of Drive circuit implementation I points of caution Po\ver Supply Unit DC supply before the optical isolation DC supply after the optical isolation Sensor Design The Hall phenomenon Sensor Mounting SYSTEM DETAILS Ill

3 4.1 Test panel or the User Interface CONCLUSIONS... "'4 ANNEXTURE IV

4 ACKNOWLEDGMENTS This project is an academic requirement of the l\f.sc. We wanted to do a project that relates with Automation. My project is "Development Platform for Motor Controls" and the project supervisor is Dr. Sisil Kumarawadu. My sincere thanks go to my Project supervisor Dr. Sisil Kumarawadu for allowing us do this project and guiding us. Many challenges were faced while designing the power electronic circuits and the controllers. Finding solutions to the many issues, which were encountered, really built a strong link between the power electronics and Electrical drives principles, which vvc learnt especially in throughout the course. Next we thank Dr. J.P. Karunadasa, the head of the Electrical Engineering Department and other staff members of the Department for imparting us the knowledge required to do this project and their comments and suggestions during presentations were also very useful. We have the pleasure of thanking all the non-academic staff members in the department laboratories and administration division who honestly supported me. Again we take this an opportunity to thank everyone whose names were not mentioned, for all the support given in many ways to accomplish this project successfully. VI

5 LIST OF FIGURES Figure 1.01: Torque Speed characteristics... 4 Figure 1. 02: VI f characteristics... 4 Figure 2. 01: Project L~fe cycle... 6 Figure 2. 02: Project Time line... 7 Figure 2. 03: Encapsulated IGBT Module (7 MBR15NFJ20)... 9 Figure 2. 04: Internal diagram of7mbr15nf120 IGBT Module Figure 2. 05: OOPic Hardware Module Figure 2. 06: Pin diagram of PIC 16F Figure 2. 07: Pin diagram of IR Figure 2. 08: Duty Cycles in one leg two IGBTs... J 3 Figure 2. 09: System Block diagram Figure 3. 01: Six-step MA TLAB output Figure 3.()2: Inverter with six IGBT switches Figure 3. 03: Six-step switching signal patterns Figure 3. 04: Sinusoidal PWM method MATLAB output Figure 3. 05: Sinusoidal PWM Technique Figure 3. 06: Oscilloscope Image for Sinusoidal PWM Figure 3. 07: Three phase implementation Synthesis Figure 3. 08: Duty cycle change with Timerl Figure 3. 09: Program Flowchart Figure 3.10: Drive Circuit Block Diagram Figure 3.11: Flowchart of Drive Circuit Design Figure 3.12: Schematic diagram Figure 3.13: PC816 Optocoupler oscilloscope Images Figure 3.14: 6N 135 Schematic Diagram Figure 3.15: 6N135 Circuit Diagram Figure 3.16(a): 6N135 Optocoupler oscilloscope Image (Pulse Stream) Figure 3.16(b): 6N135 Optocoupler oscilloscope Image (Single Pulse) Figure 3.17: IR211 0 Connection diagram Figure 3.18: IR Connection diagram Figure 3.19: Dead band time signals Figure 3. 20: Inverted Control Signal Figure 3.21 (a): Dead band time observation using Oscilloscope (Pulse Stream) 31 Figure (b): Dead band time observation using Oscilloscope (c)ingle Pulse). 32 Figure 3.22: Short circuit withstand capability Figure 3.23: Over current detector insertion methods Figure 3.24: Over current detector insertion positions andfimctions Figure 3.25: Turn-off current and wave forms Figure 3.26: G-E over voltage circuit protection circuit Figure 3.27: Gate signal oscillations counter measure Figure 3.28: DC supply before isolation Figure 3.29: DC supply after isolation Figure 3.30: Hall Effect phenomena Figure 3. 31: Sensor Internal circuit Figure 3. 32: Sensor pulse waveform Figure 3. 33: Sensor mounting on the motor Figure 3.34: chipset LCD pin diagram and OOPic connections Figure 4. 01: Us er Interface Vll