ÇUKUROVA UNIVERSITY INSTITUTE OF NATURAL AND APPLIED ...
ÇUKUROVA UNIVERSITY INSTITUTE OF NATURAL AND APPLIED ...
ÇUKUROVA UNIVERSITY INSTITUTE OF NATURAL AND APPLIED ...
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3.2.2.1. Inverters .................................................................................. 17<br />
3.2.2.2. Rectifier .................................................................................. 19<br />
3.2.2.3. DC-DC Converters ................................................................. 21<br />
3.2.2.4. AC-AC Converters ................................................................. 22<br />
3.2.3. Energy Storage ..................................................................................... 23<br />
3.2.4. Injection Transformer........................................................................... 24<br />
3.2.5. Filter ..................................................................................................... 27<br />
3.3. Control of DVR ............................................................................................... 31<br />
3.3.1. Sag/swell detection............................................................................... 31<br />
3.3.2. Operation Mode ................................................................................... 31<br />
3.3.2.1. Protection Mode ..................................................................... 32<br />
3.3.2.2. Standby Mode ......................................................................... 32<br />
3.3.2.3. Injection Mode ........................................................................ 33<br />
3.3.3. Voltage Injection Strategies ................................................................. 33<br />
3.3.3.1. Pre-sag compensation ............................................................. 34<br />
3.3.3.2. In-phase compensation ........................................................... 34<br />
3.3.3.3. Phase advance compensation .................................................. 35<br />
3.3.4. Reference Voltage Generation ............................................................. 36<br />
3.3.5. Voltage Control Methods ..................................................................... 37<br />
3.3.5.1. Open Loop .............................................................................. 37<br />
3.3.5.2. Closed Loop ............................................................................ 40<br />
3.3.6. Gate Signal Generation ........................................................................ 42<br />
4. MODELING <strong>OF</strong> PROPOSED DVR ...................................................................... 45<br />
4.1. Design of Grid and Load ................................................................................. 45<br />
4.2. Power Circuit Design of DVR Components ................................................... 46<br />
4.2.1. Design of Inverter Circuit .................................................................... 47<br />
4.2.2. Design of Inverter Filter ....................................................................... 50<br />
4.2.3. Design of DC-DC Converter ................................................................ 55<br />
4.3. Control System ................................................................................................ 59<br />
4.3.1. Sag Detection ....................................................................................... 60<br />
4.3.1.1. Enhanced Phase Locked Loop (EPLL) .................................. 60<br />
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