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電力시스템의 適正電壓 維持를 위한 無效電力制御에 관한 硏究
서보혁 慶北大學校 1984 論文集 Vol.38 No.-
A new algorithm of reactive power control to preserve bus voltages in a specified proper range, so much as to determine the optimal reactive equipments expansion plan is derived in this paper. Calculated results provide the optimal expansion schedule of the system as well as the optimal operating conditions or states of all bus including the slack. This advantage makes the new algorithm useful in both aspects of planning and operating of a system. Optimizing technique uses the Linear Programming. And the case study for a sample system proves the usefulness of the proposed algorithm.
서보혁,朴省昱 慶北大學校 1990 論文集 Vol.49 No.-
This paper identifies the parameter of the system with Gaussian noise. Comparing with the conventional Kalman filter, the square root filter decreased computation burden and runtime. The square root Kalman filter exhibits an improved numerical characteristics, particularly in ill conditions. Thes quare root Kalman filter has advantaged of low triangular matrices of error covariance. The linear quadratic Gaussian control is used for minimizing stochastic cost function. A correlation test, which checks whether the square filter is workingly optimal or not, is given. When filter is suboptimal, a technique which identifies both process noise covariance and measurement noise covariance by using innovation correlation is presented. A numeric example for the fourth order system is given to show the usefulness of the approach.
電流 制御形 PWM 초퍼에 의한 磁器 浮上用 電子石 驅動에 관한 硏究
徐輔爀,全舜鏞,成耆洌 慶北大學校 1991 論文集 Vol.51 No.-
This paper designs a chopper system to drive a magnet of a magnetic levitation system. The chopper system consists of bridge type chopper with two switching devices and two freewheeling diodes. For the given system, harmonic component of source current is analyzed according to its freewheeling type. Also, its operating charateristic is analyzed by simulating the load current waveform according to the type of current controller. From the results of simulation and harmonic analysis, in terms of current controllability, current ripple and switching frequency, load freewheeling type chopper system wish ramp comparison controller is proven to be suitable. Thus the load freewheeling type chopper system with ramp comparison controller is designed and the feasibility of the proposed system is examined through experiment.
디-젤 批塵用 移動벨트型 電氣集塵裝置의 小型化에 관한 硏究
文在德,孫鉉,서보혁,金光錫 경북대학교 공과대학 1984 工大硏究誌 Vol.13 No.-
A Moving-Belt Type Electrostatic Precipitator (MBEP) proposed by one of authers has been improved by introducing systematic control concept for the diesel soot particulates from diesel engine exhaust. The proto type MBEP was designed without helping of any precharger or precoagulator of the soot particles, and so it is too large for equipping to the vehicles. The improved one is designed as a systematic control device consisted of a precharger and a MBEP. This systematization makes it possible miniaturizing the size of MBEP without any drop of its collection performance by enhancing the corona field intensity and current density in the collection space concurrently obtained by reducing the interelectrode spacing of corona electrode to collection electrode. As a result, the collection efficiency of present MBEP system, which is reduced by ca. 1/2 in volume to the proto type MBEP, amounts to 82% at the gas velocity of 1.0m/s (this nearly equals to the gas exhaust of a 2000 cc diesel powered vehicle) and gas temperature of ca. 50℃ for the simulated soot particles ranged in size from 0.005μm (mass median diam is 1.0 μm). The collection efficiency of the improved MBEP system of 82% is higher enough to the US EPA regulation limit of 70% of the year of 1985 for the diesel powered light-duty trucks and passenger cars.