• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.6
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• pp.544-552
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• 2004

This paper deals with the hybrid active filter which can reduce the 11th/13th harmonics in AC network by using the single tuned filter. Since the proposed algorithm uses the detuning compensation capability of the filter, the output voltage of the proposed active power filter is changed according to the capacitance of capacitors, magnitude of harmonic current, resonance frequency and control mode. In this paper, the control characteristics and the design of hybrid active filter is investigated. A new hybrid active filter with new algorithm, which is an active filter with single tuned filter instead of double tuned filter, is proposed.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.9
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• pp.1232-1241
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• 2012

The ac side current of an high voltage direct current (HVDC) converter is characterized by highly non-sinusoidal waveform. If the harmonic current is allowed to flow in the connected ac system, it may cause unacceptable levels of distortion. Therefore, ac side filters are required as part of the total HVDC converter station, in order to reduce the harmonic distortion of the ac side current and voltage to acceptably low levels. The ac side filters are also employed to compensate network requested reactive power because HVDC converters also consume substantial reactive power. Among different types of filters, double-tuned filters have been widely utilized for HVDC system. This paper presents two design methods of double-tuned filter; equivalent method and parametric method. Using a parametric method, in particular the paper proposes a new design algorithm for a realistic system. Finally, the performance of the design algorithm is evaluated for a 80kV HVDC system in Jeju island with PSCAD/EMTDC program. The results cleary demonstrate the effectiveness of proposed design method in harmonics elimination and steady-state stability.

• Journal of the Korean Institute of Telematics and Electronics
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• v.12 no.1
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• pp.18-26
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• 1975

In this paper, a frequency controlled bandwidth adjustable bandpass filter consisting of 4-path system is precented. It is shown that this system has characteristics similar to ihose of the magneticuly coupled double tuned amplifier and the center frequency of the passband is able to be shifted contineolisly. The adjustable range of the bartdwidth of the filter system is anslyzed for she case of the double and single tuned characteristics. The experiment has been conducted to verify the theory of this system and the experimental resulis are in good agreement with the theoretically calculated values.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.207-208
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• 2011

세계적으로 대용량 장거리 송전에 대한 요구가 증가함에 따라 HVDC(High Voltage Direct Current) 시스템에 관심이 집중되고 있다. 대규모 전력전송이 가능한 전류형 HVDC 시스템은 무효전력 및 고조파를 발생시킨다. 따라서 이를 보상하기 위해 여러 종류의 AC필터가 사용된다. 본 논문에서는 HVDC 시스템에서 주로 사용되는 double-tuned 필터의 두 가지 설계방식을 검토한다. 또한 저항을 투입하여 공진을 줄이는 damped double-tuned 필터의 임피던스 특성을 살펴본다.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.32A no.9
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• pp.1229-1235
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• 1995

In this paper an elliptic response dual-mode 4-pole bandpass filter was designed, manu-factured, and tested. A dual-mode filter having two stages cascaded double-tuned cavities which are resonant in two independent orthogonal TE113 circular-cavity modes and provide a bandpass response. A 4-pole dual-mode elliptic function bandpass filter has a center frequency of 14.022 GHz with a bandwidth of 36 MHz which is the first channel of the KOREASAT up-link frequency. The measured experimental results of a dual-mode filter are 1 dB insertion loss in the passband and 20 dB out-of-rejection.