Full Record

Author | Upadhyay, Abhishek Kumar |

Title | A GENERALIZED CONTROL METHOD FOR CONSTANT SWITCHING FREQUENCY THREE PHASE PWM BOOST RECTIFIER UNDER EXTREME UNBALANCED OPERATION CONDITION |

URL | http://rave.ohiolink.edu/etdc/view?acc_num=csu1449719352 |

Publication Date | 2015 |

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 |

Sample Search Hits | Sample Images | Cited Works

…*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…