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지역냉방용 직접순환식 아이스슬러리 시스템의 현장적용 사례
유호선(Hoseon Yoo),이상훈(Sang Hoon Lee),이윤표(Yoon Pyo Lee) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.9
In order to investigate the feasibility of a direct ice slurry transporting system for the purpose of district cooling, a case study of field application is performed. The research aims include the field measurement of ice packing factor, the performance of coldness delivery, and the branching characteristics of ice slurry. Two representative types of pipe branch are dealt with in this work. For the slurry flow with ice volume fraction of 0.16 or less, the pipe blocking due to aggregation is not observed. Based on the time-wise variation of temperature in the storage tank, a calculating method of ice packing factor is newly developed, which seems to be useful when the brine concentration is unknown. It is confirmed that the mass flow rate of ice slurry per unit cooling load is markedly reduced with increasing the ice content. The pumping power also decreases, but remains unchanged for high ice fractions. The distribution of ice particle before and after branching shows a good uniformity within the range of 5% difference, but yields a unique trend depending on the flow rate.
2MW M/G 시스템을 이용한 가스터빈 10MW 정지형 기동장치 성능시험
류호선(Hoseon Ryu),이경규(Kyungkyu Lee),문주영(Jooyoung Moon),이주현(Joohyun Lee) 대한전기학회 2020 전기학회논문지 P Vol.69 No.1
The purpose of the static starting equipment(SSE) is to accelerate a synchronous machine up to a speed at which it can begin to run on its own. Because of its compressor, gas turbine must be run up to about 20∼30% of its rated speed before it is capable itself of producing enough power to continue accelerating the set. Recent korea researchers have developed the 10MW startup equipment based on the accumulated high power conversion technology. The 10MW startup equipment, which is scheduled to be applied to the B power plant, is equipped with the latest sensorless speed control technology. It was tested for checking performance before applying to the site. In this paper, the contents of the performance test were described. The performance test for 10MW startup equipment was carried out in two stages. The first stage of the test was performed without being linked with synchronous machine. The purpose of the test was to verify the developed hardware, basic control loop etc. In case of power conversion, the current control function was tested by shorting the converter. The two-stage test was carried out on a simulated environment using 2MW M/G system test facility. Basically, the test is for all function check of starting equipment. By estimated position and speed, It accelerated rotor until rated speed. Various performance evaluation results came out from the last tests before the field application. The performance of each control mode was satisfactory and the applied technology is expected to be well used for starting equipment.
류호선(Hoseon Ryu),문주영(jooyoung Moon),이의택(Uitaek Lee),이주현(Joohyun Lee),강윤모(Yunmo Kang),박만기(Manki Park) 대한전기학회 2017 전기학회논문지 P Vol.66 No.2
The gas turbine static starter rotates the stationary synchronous machine by the interaction of the rotor and the stator. The detection from the initial position of the rotor has been an important issue to drive with optimum torque. Previously, the gas turbine starter was used by attaching the encoder to the synchronous machine, but the position and velocity of the rotor have been estimated by sensor-less method until recently due to the difficulty in attaching and detaching and damage caused by the shaft voltage noise. In this paper, Rotor initial(stationary state) position estimation, forced commutation control(speed less than 10%), and natural commutation control(speed more than 10%) method using magnetic flux with integrated terminal voltage were presented and the sensor-less speed control performance was verified. As a result of making and evaluating the 29 kVA synchronous machine and the starting device, the performance of each control mode was satisfactory. Furthermore, the applied technology is expected to be used for the development of the gas turbine starter of tens of MW class and the field application.