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최장흠(Jang-Hum Choi),김재한(Jae-Han Kim),김진영(Jin-Young Kim),윤종수(Jong-Su Yoon) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
Since three phase balancing is necessary to operate power system transposition and reverse phase array are used to balance transmission line parameters. They can not be used often because of the situation of real system. In this case, unbalancing ratio of transmission line should be investigated to confirm stability of system operation. This paper presents assessment of three-phase unbalanced transmission line by using PSCAD.
최순호(Soon-Ho Choi),최장흠(Jang-Hum Choi),김찬기(Chan-Ki Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.1
This paper deals with the concept design of HVDC system for controlling AC network reactive power. HVDC system can control active power and reactive power and the control concept of reactive power is similar to SVC(Static Var Compensator). Reactive power is controlled by adjusting firing angle of HVDC system under the condition that AC filters are switched. Reactive power depends on AC voltage condition, considering the steady-state and transient state to maintain the stable operation of AC network in the viewpoint of voltage stability. Therefore, in the design stage of HVDC, the reactive power required in the AC network must be considered. For the calculation of operation angle in HVDC system, the expected reactive power demand and supply status is examined at each AC system bus. The required reactive power affects the determination of the operation angle of HVDC. That is, the range of "control deadband" of operation angle should have the capability supplying the required reactive power. Finally, the reactive power control concepts is applied to 1GW BTB Pyeongtaek-Dangjin HVDC system.