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4. MODELING <strong>OF</strong> PROPOSED DVR Mustafa İNCİ 4.2.3. Design of DC-DC Converter This topics presents the controller design procedures of the full bridge isolated dc/dc converter used in proposed DVR. Figure 4.8 shows the structure of proposed dc-dc converter. Figure 4.8. Circuit diagram of full bridge DC–DC Converter The main function of the dc-to-dc converter is to maintain and control the dc voltage of the inverter during voltage sag. Proposed DC-DC converter allows the DVR to compensate deep and long duration voltage sags(Jowder et al., 2009). Timing diagram with basic operating waveforms are presented in Figure 4.9. Gate signals (S1, S2, S3 and S4) are generated with comparison of reference signal with carrier. Primary switches, S1-S4, are hard switched and operated in pairs, S1-S2 and S3-S4 respectively. Drive signals are 180 degree phase shifted. Switch transistor duty cycle, D, is below 50 percent to avoid switch overlap and thus short circuit of input (Nymand et al., 2010). 55
4. MODELING <strong>OF</strong> PROPOSED DVR Mustafa İNCİ Figure 4.9. Timing diagram and basic waveforms for isolated full-bridge dc-dc converter 2010). Basic converter operation can be divided into four main states(Nymand et al., State 1, First on-period, T1:A first converter on-period, T1, starts when switches, S1-S2, are turned on. Switches, S3-S4, and diodes, D3-D4, are off. Reflected inductor current flows from input capacitor, C1, through switch, S1, transformer, T1, diode, D1, and inductor, L1 to the output, and returns to input through diode, D2, and switch, S2. The period ends when switches, S1 and S2, are turned off again. Duration of the on-period is (Nymand et al., 2010): T = DT 1 (4.11) The plot for the secondary voltage Vs is shown on Figure 4.9, 56
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ÇUKUROVA UNIVERSITY INSTITUTE OF N
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ABSTRACT MSc THESIS MODELING AND AN
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ACKNOWLEDGEMENTS First and foremost
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3.2.2.1. Inverters ................
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VII
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LIST OF FIGURES PAGES Figure 1.1. D
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Figure 5.3. Injected voltages by us
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LIST OF SYMBOLS C : DC Link Capacit
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LIST OF ABBREVATIONS A AC APF ASD C
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1. INTRODUCTION Mustafa İNCİ 1. I
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5. SIMULATION RESULTS AND CASE STUD
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5. SIMULATION RESULTS AND CASE STUD
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6. CONCLUSION Mustafa İNCİ 6. CON
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6. CONCLUSION Mustafa İNCİ • En
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DELFINO, B., FORNARI, F., PROCOPIO,
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KARIMI-GHARTEMANI M., IRAVANI M.R.
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OĞUZ, G., 2004. Performance Of A D
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TESTA A., AKRAM M.F., BURCH R., CAR
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BIOGRAPHY Mustafa İNCİ was born i
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APPENDIX 123
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LIST OF PUBLICATIONS International
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