Geun-Joon Lee

A Study on Requirement of Nuclear Power Plant Load Following Operation Condition Considering Power System Security

Nuclear power generation is increasing domestic power supply ratio by lower CO2 emission and fuel prices. Currently, nuclear power generator has been operated with maximum power output. Therefore, nuclear power generator could be no effect to managing the reactive power reserve on power system. The reactive power reserve is calculated to the difference between maximum facility and operation generation capacity of the power system. This paper was proposed that load following of nuclear power is control by using 15-bus power system model. In the simulation result, power system is shown to safety state by operating load following of nuclear power generator. This method has be improved the supplied reliability through economic and efficient operation.

A study result on coordinative protection method of HTS cable implemented distribution system

This paper proposes a coordinative protection study results of 22.9kV HTS(High-Temperature Superconducting) cable implemented distribution system. HTS cable can provide about 5 times larger transfer capacability compare to conventional XLPE cable, however, it has different heat characteristic so called quench. This paper presents the simulation results on Ichun substation HTS cable which connects main transformer and 22.9kV bus. Various expected fault cases are considered and discussed to examine whether conventional protection scheme is effective to protect both of existing facilities and HTS cable. With the results of simulation, conventional protection scheme can be used if instantaneous element and time inverse elements could be adjusted with proper time coordination. Internal temperatures of HTS cable conductor in safe region with proper protection without quench. This results are to be demonstrated by the field test and will be implemented in Ichon substation HTS cable protection and control system.

Customer Nodal Cost Calculation considering Power Quality

This paper measures power quality of bus in case electric charges about customer are imposed by each bus, supposed that can calculate this cost. When reflected this in system planning, expected cost proposed following method through sample system. To calculate nodal cost operating condition of power equipment calculates nodal cost[

EFFECTS OF LOAD CHARACTERISTICS ON THE TRANSIENT STABILITY OF KEPCO'S SYSTEM

/MVAH] supposing by situation that is optimized by OPF(optimal power flow) in system. The damage cost that is shed by fault that happen during year of loads in system that is linked on each bus was produced. As a result, proposed method was very effective in case of calculating bus total cost including power quality cost.

Effects of Load Characteristics on the Transient Stability of KEPCO'S System

For accurate transient stability studies, a reasonable load representation is necessary as well as a good generator model. The effects of the load with static and dynamic characteristics on the transient stability problem are investigated. This paper summarizes the methods to derive a load model with dynamic characteristics for the transient stability study of the KEPCOs system, which has many industrial loads, and demonstrates the systems performance. The behaviors of dynamic loads have significant influences on the transient stability.

A Study on Local Coordinative Reactive Power Control between STATCOM and Other Reactive Power Controllers for Voltage Stability Improvement at Substation

Abstract For accurate transient stability studies, a reasonable load representation is necessary as well as a good generator model. The effects of the load with static and dynamic characteristics on the transient stability problem are investigated. This paper summarizes the methods to derive a load model with dynamic characteristics for the transient stability study of the KEPCOs system, which has many industrial loads, and demonstrates the systems performance. The behaviors of dynamic loads have significant influences on the transient stability.