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Title A GENERALIZED CONTROL METHOD FOR CONSTANT SWITCHING FREQUENCY THREE PHASE PWM BOOST RECTIFIER UNDER EXTREME UNBALANCED OPERATION CONDITION
URL
Publication Date
Degree MSin Electrical Engineering
Discipline/Department Washkewicz College of Engineering
Degree Level masters
University/Publisher Cleveland State University
Abstract This thesis presents a generalized control method for constant switching frequency PWM Boost Type Rectifier under extremely unbalanced operating conditions in the power system. The proposed analytical method is verified by using MATLAB/ Simulink model developed under severe unbalanced conditions of input source voltages and input impedances. The closed loop control method for controlling the output DC voltage is also presented and verified by using MATLAB/Simulink model. An experimental model is built to prove the feasibility of the proposed constant switching frequency operation of the PWM Boost Type Rectifier under extreme unbalanced operation conditions by using DSPACE RT1104 digital control system.
Subjects/Keywords Electrical Engineering; Three phase PWM boost rectifier; Extreme Unbalanced Operation; Constant Switching frequency; converter; variable hysteresis controller; Unity power factor operation; Output voltage control
Contributors Stankovic, Ana (Committee Chair)
Language en
Rights unrestricted ; This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
Country of Publication us
Format application/pdf
Record ID oai:etd.ohiolink.edu:csu1449719352
Repository ohiolink
Date Indexed 2016-12-22
Grantor Cleveland State University

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converter model with fictitious midpoint M at output DC link…… 9 4. Simulation plot for synthesized voltage Vs1 at the input of three phase boost converter of phase‘a’……………………………………………………………………………………... 10 5. Three phase PWM boost converter average model…

…with DC output voltage reflected to AC side of converter module……………………………………………………………………. 10 6. Three phase PWM boost converter model with midpoint M grounded at output DC link…. 11 7. Simulation plot of synthesized voltage Vs1 at the input of three

phase boost converter of phase ‘a’ with grounded M………………………………………………………………………... 11 8. Single phase equivalent circuit with three phase boost rectifier with grounded ‘M’……….. 12 9. Switching waveform for hysteresis controller for positive cycle of…

…rectifier with midpoint floating…………….. 17 13. Equivalent Circuit for three phase PWM Converter with DC link mid-point grounded…… 18 14. Single phase equivalent circuit for grounded DC mid-point (a) phase ‘a’,(b) phase ‘b’ and (c…

…respectively…... 22 16. Schematic diagram for implementation of current controller as a variable hysteresis controller for each phase……………………………………………………………………. 23 17. Schematic diagram for implementation of three phase PWM boost converter for unbalanced…

…the converter is designed. V1*, V2*, and V3* and S* are complex conjugate of the three phase input voltages and the apparent power respectively. Equation (7) is derived for second harmonic elimination from the output DC voltage. 𝑆𝑤1 𝐼1…

…Fig. 2 has no drawn out mid-point of output DC link, hence it is redrawn by considering a DC-link mid-point M as shown in Fig. 3 where L1, L2 and L3 are values of input inductances. Figure 3: Three phase PWM boost converter model with fictitious…

…voltage Vs1 is shown in Fig. 4 for balanced input condition. 2Vdc /3 Vdc /3 Vdc /3 0 Figure 4: Simulation plot for synthesized voltage Vs1 at the input of three phase boost converter of phase ‘a’ The voltage takes instantaneous value of 0, ±Vdc/3 and…

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