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4. MODELING <strong>OF</strong> PROPOSED DVR Mustafa İNCİ V (s) - V ref (s) - v - c i Error Signal for PWM V (s) I (s) Figure 4.22. Proposed multiloop control method To track the load voltage properly, it is necessary to include a load voltage feedback. If the filter capacitor current is fed back to achieve a sinusoidal capacitor current while an outer voltage loop is used to regulate the output voltage. A feedforward loop will also be incorporated to improve dynamic response of the load voltage(Vilathgamuwa et al., 2002). After a voltage sag/swell is detected, the difference between the reference voltage and measured load voltage is calculated in per unit. The DVR injected voltage feedback ( V l ) is compared with its reference ( V ref ) and the capacitor current(Ic) is used to improve dynamic performance of DVR. Then, the error is used to generate PWM signals. The natural damping frequency of closed-loop ω damping , 1 ω damping = ( 1+ nkikckv ) (4.51) L C f f The natural damping frequency in closed loop system is therefore approximately 1+ nk k k ) times filter resonance frequency. The value of LC ( i c v cutoff frequency is about 300 Hz in open loop control method. By choosing n 2 , k = 1, k = 50, k = 0.15 in proposed controller, Figure 4.23 explain the effect = i v c of closed loop method compared to open loop. 77
4. MODELING <strong>OF</strong> PROPOSED DVR Mustafa İNCİ Vbusbar(rms) CLOSE-LOOP VOLTAGE CONTROL METHOD Vload(rms) 7.00 6.80 6.60 6.40 6.20 6.00 5.80 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 4.00 7.00 6.80 6.60 6.40 6.20 6.00 5.80 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 4.00 0.200 0.240 0.280 0.320 0.360 0.400 0.440 0.480 Vbusbar(rms) OPEN-LOOP VOLTAGE CONTROL METHOD Vload(rms) 0.200 0.240 0.280 0.320 0.360 0.400 0.440 0.480 Figure 4.23. Comparison of Close Loop and Open Loop in proposed DVR As it is seen from Figure 4.23, Closed loop shows better performance than open loop method. Closed loop regulate the output voltage and keeps it constant at the side where a nonlinear load is connected. 4.3.4. Gate Signal Generation In proposed DVR, gate signals are generated for two converters: • Symmetrical five level diode clamped multilevel inverter • Full bridge DC-DC converter 78
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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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1. INTRODUCTION Mustafa İNCİ 4
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2. POWER QUALITY Mustafa İNCİ 2.1
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2. POWER QUALITY Mustafa İNCİ •
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3. FUNDAMENTALS OF DVR Mustafa İNC
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Page 140 and 141: BIOGRAPHY Mustafa İNCİ was born i
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Page 144 and 145: LIST OF PUBLICATIONS International
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