Recently, utility network is becoming more and more complicated and huge due to IT and OA devices. In addition to, demands of power conversion devices which have non-linear switching devices are getting more and more increased. Consequently, because of the non-linear power semiconductor devices, cur...
Recently, utility network is becoming more and more complicated and huge due to IT and OA devices. In addition to, demands of power conversion devices which have non-linear switching devices are getting more and more increased. Consequently, because of the non-linear power semiconductor devices, current harmonics are unavoidable. Sometimes those current harmonics flow back to utility network and become one of the main reasons which can make the voltage distortion. Also, it makes noise and heat loss. On the other hands, voltage sag from sudden increasing loads is also one of the terrible problems inside of utility network. In order to compensate the current harmonics and voltage sag problem, AF(active filter) systems could be a good solution method. SMES is a very good promising source due to it's high response time of charge and discharge. Therefore, the combined AF and SMES system can be a wonderful device to compensate both harmonics current and voltage sag. However, SMES needs a superconducting magnetic coil. Because of using this superconducting magnetic coil, quench problem caused by unexpected reasons have always been unavoidable. Therefore, to solve out mentioned above, this paper presents a decisive method using shunt and series active filter system combined with SMES. Especially, authors analyzed the change of original energy capacity of SMES regarding to the size of resistance caused by quench of superconducting magnetic coil.
Recently, utility network is becoming more and more complicated and huge due to IT and OA devices. In addition to, demands of power conversion devices which have non-linear switching devices are getting more and more increased. Consequently, because of the non-linear power semiconductor devices, current harmonics are unavoidable. Sometimes those current harmonics flow back to utility network and become one of the main reasons which can make the voltage distortion. Also, it makes noise and heat loss. On the other hands, voltage sag from sudden increasing loads is also one of the terrible problems inside of utility network. In order to compensate the current harmonics and voltage sag problem, AF(active filter) systems could be a good solution method. SMES is a very good promising source due to it's high response time of charge and discharge. Therefore, the combined AF and SMES system can be a wonderful device to compensate both harmonics current and voltage sag. However, SMES needs a superconducting magnetic coil. Because of using this superconducting magnetic coil, quench problem caused by unexpected reasons have always been unavoidable. Therefore, to solve out mentioned above, this paper presents a decisive method using shunt and series active filter system combined with SMES. Especially, authors analyzed the change of original energy capacity of SMES regarding to the size of resistance caused by quench of superconducting magnetic coil.
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가설 설정
According to the harmonic current as shown in Fig. 7(a), the utility line current is strongly influenced. It is well known that the harmonics current deteriorates the quality of utility.
제안 방법
with SMES. Also, authors analyzed the change of the original energy capacity of SMES regarding to the size of resistance caused by quench of superconducting magnetic coil.
And also, in order to verify how much the compensation capacity for voltage sag is influenced by the internal resistance, various conditions, which include the change of load size generating voltage sag and the change of internal resistance level caused by quench regarding to different SMES conditions, are simulated and analyzed. Finally, not only the size of superconducting magnetic coil is very important for compensation capacity, but also the stability of superconducting magnetic coil is one of the most significant factors to improve the performance of SMES system.
3 shows the current waveform of superconducting magnetic coil according to the charge and discharge operation. In order to confirm the characteristics of the superconducting magnetic coil in PSCAD/EMTDC, after operating on the charging mode until 4.7[sec], SMES system was tested as the discharging mode. After all, it is confirmed that the simulated circuit of the charging and discharging SMES system is well operated as authors expected.
In this paper, a PSCAD/EMTDC model for AF-SMES system was demonstrated, and described a good operation performance of both harmonic currents and voltage sag compensation. And also, in order to verify how much the compensation capacity for voltage sag is influenced by the internal resistance, various conditions, which include the change of load size generating voltage sag and the change of internal resistance level caused by quench regarding to different SMES conditions, are simulated and analyzed.
Therefore, this paper presents a decision method of the specification of the shunt and series active filter system combined with SMES. Also, authors analyzed the change of the original energy capacity of SMES regarding to the size of resistance caused by quench of superconducting magnetic coil.
참고문헌 (5)
J. H. Oh, S. H. Ko, Y. S. Kim, "A Study on the Multi-functional Series Active Power Filter" ICEE Vol. 2, pp. 608-612, July. 2002
Minwon Park, Nak-Gueon Seong, In-Keun Yu, "A Novel Photovoltaic Power Generation System uncluding the Function of Shunt Active Filter" Trans. IEE of Korea, Vol. 121-B, No. 11, pp. 1499-1505, 2001
H.Akagi, Y. Kanazawa, A. Nabae : "Instantaneous reactive power compensators comprising switching devices without energy storage components", IEEE Trans. on Ind. Application, vol. IA-20, pp. 625-630, 1984
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