ALectureonImprovePowerQualityConverters.ppt

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Single-Phase Zeta AC-DC ConverterSpecifications Single-Phase Buck-Boost Zeta AC-DC Converter in CCM Steady state output voltage in DCM at 100% load Source voltage and current in DCM at 100% load Single-Phase Buck-Boost Zeta AC-DC Converter in CCM Steady state output voltage in CCM at 100% load Source voltage and current for 100% load in CCM Single-Phase Zeta AC-DC Converter Idc (A) Test results of AC mains voltage, AC mains current, output DC voltage and output DC current waveform of AC-DC zeta converter for load perturbation response on equivalent resistive load (60W to 200W to 60W). (Scale on X-axis 1div=20ms, Y-axis channel-1 1div =150V, channel-2 1div =3A, channel-3 1div= 100V, channel-4 1div= 1.75A) Vs (V), is(A) Vdc (V) Single-Phase Zeta AC-DC Converter TABLE I Comparisons of Zeta Converter Operation in DCM and CCM Quantity DCM Operation CCM Operation 10% Load 100% Load 10% Load 100% Load Input Current THD 11% 4.98% 9.2% 1.36% PF 0.993 0.9975 0.994 0.998 Output Ripple 0.62% 1.99% 0.67% 1.98% Normalized Current of Switch Peak 9.21 4.15 2.92 1.75 Average 0.92 1.01 0.45 0.62 RMS 2.15 1.71 1.04 0.95 Normalized Current of Diode Peak 36.90 20.01 14.6 8.73 Average 4.52 3.02 3.24 3.17 RMS 10.45 5.41 5.37 4.57 Control Technique Voltage Mode Control Average Current Control Size of Converter Small Large Circuit Simplicity Simple Complex References R. W. Erickson, Fundamentals of Power Electronics. New York: Chapman Hall, 1997. A. I. Pressman, Switching Power Supply Design. Second Edition, New York: McGraw-Hill, 1998. P. T. Krein, Elements of Power Electronics. New York: Oxford University Press, 1998. M. H. J. Bollen, Understanding Power Quality Problems: Voltage Sags and Interruptions. New York: IEEE Press Series on Power Engineering, 2000. D. Boroyevich and S. Hiti, Three-phase PWM converter: Modeling and Control Design. Seminar 9, IEEE APEC’96, 1996. M. F. Schlecht and B.A Miwa,