業界通常為了修正落後的功率因數會加入電容器，但當電容器在投入瞬間，會產生很大的暫態充電電流及暫態過電壓，以致於損壞設備或縮短設備壽命，為了抑制這些暫態現象，本文提出一個新型混合式電容器切換暫態抑制器，可有效的提高電容器及保護元器件的壽命。在電容器通電瞬間，此混合式暫態抑制器被動的在電路中提供高阻抗，有效地抑制暫態現象；在穩態期間，混合式暫態抑制器主動被旁通，使暫態抑制器近似短路而對電路幾乎沒有影響，且大幅降低在穩態下功率損失，且建製成本低廉。此暫態抑制器之可行性已藉由單相220V系統1.825kVAR 100μF電容器進行實驗及PowerSIM軟體模擬予以驗證。

SUMMARY
For improving the lagging power factor, capacitors will be used in the industrial power system. Three major phenomena will be produced when capacitor switch transient. One is the transient overvoltage, two is the transient oscillation voltage and the other is the large charging current. These transients will shorten the lifetime of the capacitor or damage the switching device. For restraining these transient phenomena, this thesis proposes a hybrid switching capacitor transient limiter (H-CSTL). The proposed H-CSTL is inserted in series between the power source and the capacitor. The proposed H-CSTL will passively provide high impedance to effectively suppress the switching transients. During the steady-state the H-CSTL acts as short circuit, it has almost no effect in the circuit. As a result, the capacitor voltage and current waveforms will not be distorted and the power loss of the H-CSTL will be very low. Moreover, the performance and feasibility have been verified via experimented and PowerSIM software simulation by single phase 220V 1.825kVAR 100μF capacitor.

[1] 楊正光，產業用電節能方法---功率因數之改善, 能源資訊網, Jul. 2004

[2] L. M. Smith, “A Practical Approach in Substation Capacitor Bank Applications to Calculating, Limiting, and Reducing the Effects of Transient Currents”, IEEE Trans. Ind. Appl., vol. 31, No. 4, pp.721–724, Jul. 1995.

[3] J. C. Wu, H. L. Jou, K. D. Wu, and N. T. Shen, “Hybrid Switch to Suppress the Inrush Current of AC Power Capacitor”, IEEE Trans. Power Delivery, vol. 20, pp. 506-511, Jan. 2005.

[4] R. W. Alexander, “Synchronous Closing Control for Shunt Capacitors”, IEEE Trans. Power Apparatus and Systems, vol. PAS-104, No. 9, pp. 2619-2625, Sep. 1985.

[5] J. C. Das, “Analysis and Control of Large Shunt Capacitor Band Switching Transients”, IEEE Trans. Ind. Appl., vol. 41, No. 6, pp.1444–1451, Nov. 2005.

[6] K. C. Liu and N. Chen, “Voltage-peak Synchronous Closing Control for Shunt Capacitors,” Proc. Inst. Elect. Eng., Gen. Trans. Distrib., vol. 145, no. 3, pp. 233–238, May 1998.

[7] K. P. Basu and A. Asghar, “Reduction of Magnetizing Inrush Current in a Delta Connected Transformer”, IEEE Conference Power and Energy(PECon08), pp. 35-38, Dec. 2008

[8] M. Abapour and M. Tarafdar Hagh, “A Non- Control Transformer Inrush Current Limiter,” Industrial Technology, IEEE International Conference on, pp. 2390-2395 ICIT 2006.

[9] S. T. Tseng and J. F. Chen, “A Novel Method for Mitigating the Capacitor Switching-on Transients”, Universities Power Engineering Conference (AUPEC), 2010 20th Australasian, pp. 1-5, Dec. 2010.

[10] S. T. Tseng, J. F. Chen, and T. J. Liang, “Symmetrical Structure Transient Limiter for Suppression of Capacitor Switching Transients”, IEEE Trans. Power Delivery, vol. 26, No. 4, pp.2821-2828, Oct. 2011.

[11] H. T. Tseng and J. F. Chen, “Voltage Compensation Type Inrush Current Limiter for Reducing Power Transformer Inrush Current”, IET Electr. Power Appl., vol. 6, Iss. 2, pp. 101-110, 2012.

[12] M. Tarafdar Hagh and M. Abapour, “DC Reactor Type Transformer Inrush Current Limiter”, IET Electr. Power Appl., vol. 1, Iss. 5, pp. 808-814, 2007.

[13] H. C. Seo, C. H. Kim, S. B. Rhee, J. C. Kim, and O. B. Hyun, ”Superconducting Fault Current Limiter Application for Reduction of the Transformer Inrush Current：A Decision Scheme of the Optimal Insertion Resistance”, IEEE Trans. Appl. Superconductivity, vol. 20, No. 4, Aug. 2010.

[14] H. Shimizu, K. Mutsuura, Y. Yokomizu, and T. Matsumura, “Inrush-Current-Limiting with High Tc Superconductor”, IEEE Trans. Appl. Superconductivity, vol. 15, No. 2, Jun. 2005.

[15] 維基百科：http://zh.wikipedia.org/wiki/超導體