本論文旨在探討風力發電用繞線型轉子感應發電機之負載潮流分析，並研究當發電機組運轉於穩態時，轉子阻抗的變化對於功率輸出之影響。在本論文中，亦討論一系列適用於分析感應電機之數學方程式，並加以整理變化，於複數平面上繪製成新型特性圓線圖，以作為分析工具，藉以瞭解感應發電機連接至電力系統的負載潮流特性。繞線型轉子感應發電機之轉子阻抗值會受轉差率的改變因而有所變動，本論文探討當以風力帶動感應發電機組併聯至電力系統時，因風速改變而造成轉差率的改變，而對於整個系統其負載潮流所造成的影響。為此本論文提出適合的模型以及數學方程式以建立出分析架構，以瞭解風力發電機運作於穩態時負載潮流與轉差率之間的關係。

The purpose of this thesis is to study the power flow of wound rotor wind induction generators (WIG) connected to a power system. The research of the thesis is to determine the influence of the machine output power subject to the variations of external rotor impedance of the studied WIG under steady-state conditions. A series of suitable mathematical formulas for the analyses of WIG are discussed and reformed into novel characteristic power circles on the complex plane. The characteristic power circles are powerful tools for understanding the power flow of WIG. One reason for varying rotor impedance of the studied WIG is to change the value of slip. The influence caused by wind speed and the associated slip of WIG on the power flow is examined. To understand the relationship between the slip of the studied WIG and power flow of the power system to which the WIG is connected, suitable models and mathematical formulas are also presented and examined.

[1] D.B. Watson, J. Amlaga and T. Densem, “Controllable d.c. power supply from wind-driven self-excited induction machines,” IEE Proceedings, vol. 126, no. 12, 1979, pp. 1245-1248.
[2] J.B. Patton and D. Curtice, “Analysis of utility protection problems associated with small wind turbine interconnections,” IEEE Transactions on Power Apparatus and Systems, vol. 101, no. 10, 1982, pp. 3957-3966.
[3] R. Ramakumar, “Renewable energy sources and developing countries,” IEEE Transactions on Power Apparatus and Systems, vol. 102, no. 2, 1983, pp. 502-510.
[4] K. Nandigam and B. H. Chowdhury, “Power flow and stability models for induction generators used in wind turbines,” IEEE 2004 Power Engineering Society General Meeting, vol. 2, 2004, pp. 2012-2016.
[5] S.S. Murthy, C.S. Jha and P.S.N. Rao, “Analysis of grid connected induction generators driven by hydro/wind turbines under realistic system constraints,” IEEE Transactions on Energy Conversion, vol. 5, no. 1, 1990, pp. 1-7.
[6] J.A. Pecas Lopes, F.P.M. Barbosa and J.C. Pidre, “Simulation of MV distribution networks with asynchronous local generation sources,” IEEE Proceedings, Electro- technical Conference, vol. 2, 1991, pp. 1453-1456.
[7] N.D. Hatziargyriou, T.S. Karakatsanis and M. Papadopoulos, “Probabilistic load flow in distribution systems containing dispersed wind power generation,” IEEE Transactions on Power Systems, vol. 8, no. 1, 1993, pp. 159-165.
[8] S.S. Murthy, C. Prabhu, A.K. Tandon and M.O. Vaishya, “Analysis of series compensated self excited induction generators for autonomous power generation,” Proceedings of International Conference on Power Electronics, Drives and Energy Systems for Industrial Growth, vol. 2, 1996, pp. 687-693.
[9] V.M. da Costa, N. Martins and J.L.R. Pereira, “Developments in the Newton Raphson power flow formulation based on current injections,” IEEE Transactions on Power Systems, vol. 14, no. 4, Nov. 1999, pp. 1320-1326.
[10] D.L. Skaar, “Analysis of single phase induction motors using the IODEKICE LOCUS,” IEEE Transactions on Power Systems, vol. 9, no. 2, May 1994, pp. 579-584.
[11] A. Toumi, “An aid for teaching doubly fed synchronous machines based on the circle diagram,” IEEE Transactions on Education, vol. 45, no. 2, May 2002, pp.171-176.
[12] T.F. Chan, K. Nigim and L.L. Lia, “Voltage and frequency control of self-excited slip-ring induction generators,” IEEE International Conference on Electric Machine and Drives, 2001, pp. 410-414.
[13] Y. Baghzouz and O.T. Tan, “Optimal efficiency speed control of induction motors by variable rotor impedance,” IEEE Transactions on Energy Conversion, vol. 4, no. 2, June. 1989, pp. 1320-1326.
[14] 莊二龍，高效率感應電機之特性分析，國立成功大學電機工程研究所碩士論文，民國92年6月。
[15] 黃智明，電機機械，鼎茂圖書，民國86年。
[16] P.C. Krause, Analysis of Electric Machinery, New York: McGraw-Hill Book Company, 1987.
[17] C.S. Moo, C.C. Wei, C.L. Huang and C.S. Chen, “Starting control of wound-rotor induction motors by using chopper-controlled resistance in rotor circuit,” IEEE Industry Applications Society Annual Meeting Conference Record, vol. 2, Oct. 1989, pp. 2295-2300.
[18] S. Lesan, M.S. Smiai, and W. Shepherd, “Control of wound rotor induction motor using thyristors in the secondary circuits,” IEEE Transactions on Industry Applications, vol. 32, no. 2, 1996, pp. 335-344.
[19] 郭塗註，電工機械，下冊，大中國圖書公司，民國87年，第39-43頁。
[20] S. Lesan, and W. Shepherd, “Control of wound rotor induction motor with rotor impedance variation,” IEEE Industry Applications Society Annual Meeting Conference Record, vol. 3, Oct. 1993, pp. 2115-2122.
[21] S. Heier, Grid Integration of Wind Energy Conversion Systems, New York: John Wiley & Sons Inc., 1998.
[22] A.E. Feijoo and J. Cidras, “Modeling of wind farms in the load flow analysis,” IEEE Transactions on Power Systems, vol. 15, no. 1, Feb. 2000, pp. 110-115.
[23] J. Cidras and A.E. Feijoo, “A linear dynamic model for asynchronous wind turbines with mechanical fluctuations,” IEEE Transactions on Power Systems, vol. 17, no. 17, Aug. 2002, pp. 681-687.
[24] H. Saadat, Power System Analysis, New York: McGraw- Hill Book Company, 1999.
[25] G. Huang and W. Ongsakul, “Managing the bottlenecks in parallel Gauss-Seidel type algorithms for power flow analysis,” IEEE Transactions on Power Systems, vol. 9, no. 2, May 1994, pp. 677-684.
[26] J. Lu, C.-W. Liu and J.S. Thorp, “New methods for computing a saddle-node bifurcation point for voltage stability analysis,” IEEE Transactions on Power Systems, vol. 10, no. 2, May 1995, pp. 978-989.
[27] M.A. El-Sharkawi and S.S. Huang, “Application of query-based learning to power system static security assessment,” Proceedings of the Second International Forum on Applications of Neural Networks to Power Systems, ANNPS’93, 19 April 1993, pp. 111-117.