• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.429-430
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• 2020

2상 유도전동기를 구동하기 위한 2레그형 인버터에서는 직류링크 양단에 직렬로 연결된 2개의 커패시터에 걸리는 전압에 불균형이 발생하므로 이것이 전동기 상전류의 불평형과 토크리플을 야기한다. 본 논문에서는 이러한 상전류의 불평형을 간접 보상할 수 있는 PWM 제어 방법과 커패시터 전압의 균형을 제어함으로써 전동기 상전류의 평형을 유지할 수 있는 직접 보상 방법을 제안하였다.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.2
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• pp.122-127
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• 1999

In this paper, the power factor correction circuit using a parallel drive method is proposed so that the high power inverter air-conditioner with 3[hp] compressor motor may obtain the cost down and the improved performance. The adequate design porcedures are presented to reduce the material costs by eliminating the power factor imprving LC filter and derating output capacitor and inverter switches. Using the determined components. the proto-type circuit with 6[kW] power consumption is built and tested to verify the operation of the proposed circuit.

• Proceedings of the KIEE Conference
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• 1997.07f
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• pp.2104-2106
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• 1997

In order to develop the three phase GTO CSI with double recovery path of commutation energy by passive devices (LCD), we studied the clamping circuit to protect switching device and energy recovery circuit to recover absorbed energy of capacitor and DC inductor. In this paper, we investigated how DC input power is increased or decreased according to energy recovery path with or not in the three phase GTO current source inverter, we used a induction motor as inverter load, and controlled a induction motor with v/f constant control. Experimental results show that dissipated DC power is decreased in $9{\sim}14%$ by double recovery path. We also confirmed that the characteristics is met as compare simulation results with experimental results according to each frequency.

• Proceedings of the KIEE Conference
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• 2003.10b
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• pp.3-5
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• 2003

This paper deals with the characteristics of a capacitor-run single-phase induction motor by changing of conductor bar numbers. The Finite Element Method (FEM) is used to analyze the starting characteristics according to the rotor initial starting point about conduction bar and the characteristic analysis at the rated condition is calculated by equivalent circuit based on symmetry coordinate theory Finally, the analysis results of the analysis models have different conductor bars in their rotor are compared.

• Proceedings of the KIPE Conference
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• 2003.07a
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• pp.481-484
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• 2003

A strategy for a torque ripple reduction drive of single-phase SRM with high power factor is proposed. The drive for switched reluctance motor (SRM) is presented to achieve sinusoidal, near unity power factor input current with low torque ripple. The proposed SRM drive has no additional active switch. And a single-stage approach, which combines a DC link capacitor used as dc source and a drive used for driving the motor into one power stage, has a simple structure and low cost. The characteristics and validity of the proposed circuit is discussed in depth through the experimental results.

• Journal of Advanced Marine Engineering and Technology
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• v.9 no.3
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• pp.250-256
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• 1985

With the advant of thryistors having large peak inverse voltages, current-source inverters are becoming very popular to feed induction motors. But it is very difficult to analysis the commutation. Since the actual variation of current during commutation is neither instantaneous nor linear and is effected by many parameters. Minimized bias-time of reverse voltages during commutation is expressed in term of machine parameters, capacitor voltage, load current and so on. The minimized bias-time is computed with y and z and also the commuation mechanism is tested on 2.2 kw induction motor. The computed results are compared with the experimental results, and the results give a good information for designing the commutation mechanism.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.186-187
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• 2011

3상 PWM 컨버터에서 LCL필터 필름 커패시터는 Self-healing 메커니즘에 의해 열화가 진행되며, 이는 시스템의 필터성능과 역률 저하로 이어진다. 따라서 계통측 커패시터의 고장을 판단하고 교체시기를 결정하는 것이 필요하다. 본 논문에서는 정전용량의 80%에 해당하는 공진주파수를 한 주기 동안 주입하였을 때 나타나는 응답의 변화를 통해 커패시터의 열화고장진단 알고리즘을 제안하였다.

• Proceedings of the KIPE Conference
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• 2004.07b
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• pp.959-962
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• 2004

A strategy for a torque ripple reduction drive of single-phase SRM with high power factor is proposed. The drive for switched reluctance motor (SRM) is presented to achieve sinusoidal, near unity power factor input current with low torque ripple. The proposed SRM drive has no additional active switch. And a single-stage approach, which combines a DC link capacitor used as do source and a drive used for driving the motor into one power stage, has a simple structure and low cost. The characteristics and validity of the proposed circuit is discussed in depth through the experimental results.

• Proceedings of the KIPE Conference
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• 2004.07a
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• pp.214-218
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• 2004

Switched Reluctance Motor (SRM) offers the advantages of simple and robust motor construction, high speeds and high efficiencies over a wide operating range of torque and speed, excellent controllability. However, SRM has the disadvantages of high current harmonics, and low power factor because of a capacitor filter is inserted in the power converter and inductance of SRM is high, it has pulse waveform of current. This paper deals with an energy efficient converter fed SRM system with the reduced harmonics and improved power factor and with higher efficiency. The validity of the proposed scheme is verified via experiment. We are implemented the proposed control system using 80C196KC micro-controller.

• Proceedings of the KIPE Conference
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• 2004.07a
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• pp.308-311
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• 2004

A novel single-stage power factor corrected (PFC) drive for switched reluctance motor (SRM) is presented to achieve sinusoidal, near unity power factor input current. The proposed PFC SRM drive has no additional active switch. And a single-stage approach, which combines a DC link capacitor used as do source and a drive used for driving the motor into one power stage, has a simple structure and low cost. The characteristics and validity of the proposed circuit will be discussed in depth through the experimental results.