제주대학교 Repository

Modeling and Analysis of DFIG Operation under Unbalanced Gnd Voltage and Non-linear Load Conditions

Metadata Downloads
Abstract
This thesis presents the modeling and analysis of doubly fed induction generator (DFIG) operations under unbalanced grid voltage in the normal and non-linear load conditions. For the simulations, a novel control strategy for wind power generation system is also applied. The oscillations of the DFIG electromagnetic torque and power in the stator side are fully described in the unbalanced grid voltage. Besides, the harmonic current components in the network which come from non-linear loads are also analyzed. A current controller, proportional-resonant (PR) controller, implemented in the stationary reference frame is proposed to mitigate the negative sequence current components in both grid side converter (GSC) and rotor side converter (RSC). To provide enhanced operation, the RSC is controlled to mitigate the stator active power and the rotor current oscillations at double supply frequency under unbalanced grid voltage while the GSC is controlled to mitigate ripples in the dc-link voltage and compensate harmonic components of the network currents. Simulation results using Psim simulation program are presented for a 2 MW DFIG wind generation system to explain the operations of DFIG under normal conditions and confirm the effectiveness of the proposed control strategy during unbalanced gird voltage and non-linear load conditions.
Author(s)
왓나우덩
Issued Date
2011
Awarded Date
2012. 2
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000005824
Alternative Author(s)
Quach Ngoc Thinh
Affiliation
제주대학교
Department
대학원 에너지응용시스템학부 Electrical Engineering
Advisor
김일환
Table Of Contents
List of figures viii
I. Introduction 1
1.1 Theoretical and historical background 1
1.2 Purpose of the thesis 2
1.3 Thesis layout 3
II. The modeling of DFIG 4
2.1 Wind turbine operation 4
2.2 Doubly fed induction generator control 7
2.2.1 DFIG equivalent circuit and equations 8
2.2.2 Rotor side converter control 10
2.2.3 Grid side converter control 13
III. The design of proposed control strategies 15
3.1 Proportional-resonant (PR) control 16
3.2 Rotor side converter 18
3.2.1 The operation of RSC under unbalanced grid voltage 18
3.2.2 Proposed control strategy for RSC 21
3.3 Grid side converter 22
3.3.1 The operation of RSC under unbalanced gird voltage 22
3.3.2 Non-linear load 23
3.3.3 Proposed control strategy for GSC 24
IV. Simulation results 26
4.1 DFIG normal operation 26
4.2 DFIG operation with non-linear load 33
4.3 DFIG operation under unbalanced grid voltage condition 35
V. Conclusion 37
Appendix 38
References 39
Degree
Master
Publisher
제주대학교
Citation
왓나우덩. (2011). Modeling and Analysis of DFIG Operation under Unbalanced Gnd Voltage and Non-linear Load Conditions
Appears in Collections:
Faculty of Applied Energy System > Electrical Engineering
Authorize & License
  • AuthorizeOpen
Files in This Item:

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.