• 전기학회논문지
• /
• 제59권2호
• /
• pp.232-241
• /
• 2010

This paper describes the development of robust contingency analysis program for Korean Energy Management System. The important function of contingency analysis is to determine the bus/branch model for contingency, and to calculate the state of the power network based on the network model and topology output. In the proposed method, the bus/branch models for contingencies are determined exactly using a fast linked-list method based on the application common model database. To calculate the state of the power system included contingency, the full-decoupled powerflow approach, the partial powerflow method for contingencies and the proposed contingency screening algorithm are also used to contingency analysis. To verify the performance of the developed processor, we performed a file-based test using several structured input data and online test using the database which resides on memory. The results of these comprehensive tests showed that the developed processors can accurately calculate the power system contingency state from online data and can be applied to Korea Power Exchange system.

• 전기학회논문지
• /
• 제67권8호
• /
• pp.994-1001
• /
• 2018

In this paper, to studied about future power system construction using PSS / E-Python API. Python-based future system automatical construction methods and modeling of renewable sources. it confirmed the stability of the powert system for each renewable area by calculating the weighted short circuit ratio (WSCR) index. it calculated the short circuit ratio (SCR) and selected the transmission line linkage scenario to improve the stability of vulnerable areas. it confirmed the WSCR index improvement through the selected transmission line linkage of scenario, and analyzed the stability of the renewable power system applying the scenario. It describes Facts and Shunt devices adjustment for the load flow convergence. It describes the stable methed of the bus voltage through the transformer Ratio Tap adjustment. By performing PSS/E ASCC using the Python it was performed three-phase short circuit fault capacity analysis, it is confirmed whether excess of the fault current circuit breaker capacity. In order to contingency accident analysis, it have described the generation of one or two line list of each areas using the Python. The list is used to contingency analysis and describe the soluted of the transmission line overload through comparison before and after adding the scenario line.

• 한국HCI학회논문지
• /
• 제6권1호
• /
• pp.17-20
• /
• 2011

Fred.E Fiedler는 상황 리더쉽 이론에서 사회 문화적 특성에 따른 Work-style을 근거하여 문화집단을 과업지향적인(Task-oriented) 집단과 관계지향적인 (Relationship-oriented)집단으로 나눈다. 본 연구는 제품사용에 있어 Task를 수행하는 성향의 정도가 제품 인터렉션에 영향을 미칠 것이라는 가설을 세우고, 이를 검증하기 위하여 Fred.E Fiedler의 상황 리더쉽 이론을 근거로 하는 LPC 실험결과의 성향 정도에 따른 제품 사용 인터렉션을 연구한다. Task-oriented 성향과 가까운 문화권 집단은 제품사용에 있어 의도한 목적을 단 시간 빠르게 수행(usability)하는 퍼포먼스의 인터렉션을 중시하고, Relationship-oriented 성향과 가까운 문화권 집단은 제품사용에 있어 목적을 수행(usability)할 때 의미부여(refelctive)적인 측면을 더 중요하게 생각할 것이라는 가설을 증명하기 위한 실험으로 비교적 Task의 의미부여(refelctive)가 동등하고 빈번하게 잘 일어나는 기기인 모바일 단말기 사용에 있어 이 두 집단의 주소록의 주기능과 부기능 사용행태를 비교하고 데이터를 수집, 분석하여 가설을 검증한다. 이 연구결과, 주소록 사용에 있어서 피들러의 상황이론에 의한 Task 수행성향은 모바일 단말기 인터렉션 사용에 영향과의 연관성은 다소 낮게 나타났으며, 관련하여 본 실험 도중 몇 가지 흥미로운 패턴을 발견할 수 있었는데, 이를 기반으로 향후 모바일 단말기의 주소록의 사용자 지향적인 디자인 방향성에 대한 가이드라인을 제시하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2007년도 추계학술대회 논문집 전력기술부문
• /
• pp.199-201
• /
• 2007

This paper presents new contingency screen and ranking method using the time-domain simulation program and energy function. Since the suggested method is very simple and has fast computation time to calculate energy margin and list the contingency according to the its severity, it can be used in connection with the on-line TSA which has accurate binary search algorithm in parallel or distributed computing environment. The suggested method has been tested by appling to 3-machine and 9-bus system, and its effectiveness has been verified.

• 대한전기학회논문지
• /
• 제39권8호
• /
• pp.779-791
• /
• 1990

This paper presents a knowledge based system to solve reactive power/voltage control problem in a power system. A need is recognized for new methods to alleviate a bus voltage limit violation more quickly when a power system becomes an emergency state due to contingency. To cope with this object, a set of indices concept which is used to make bus order list of reactive power injection priority is introduced. A set of indices, based on the overall system conditions, consists of steady state stability index, reactive power transmittance indes, voltage severity index and generator fuel cost index. This scheme and empirical rules of the knowledge on the basis of the human expert result in fast decision-making of the reactive power compensation devices since only the amount of devices is determined by the inference in the knowledge based system when the voltage violation is detected. In this approach, control devices such as shunt capacitor (reactor), transformer tap settings and generator voltages are utilized. Also the developed system herein can be used to minimize control action taken or generator fuel cost according to the user's option on the weighting factor. The results of a case study are also presented.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
• /
• pp.3-6
• /
• 2001

Power system stability is correlated with system structure, disturbances and operating conditions. and power flows in transmission lines are closely related with those conditions. This paper discusses a methodology to identify crucial transmission lines for stability diagnosis with respect to transient stability and small-signal stability. On-line monitoring of the selected lines enables to predict system stability in real-time. Also, a Procedure to make a priority list of monitored transmission lines using contingency analysis. The procedure is applied to the PSS/E test system. and it shows capabilities of the proposed method.

• 한국지하수토양환경학회:학술대회논문집
• /
• 한국지하수토양환경학회 2002년도 총회 및 춘계학술발표회
• /
• pp.199-202
• /
• 2002

Many methods have been developed for the remediation of contaminated soil and groundwater. Among those technologies, in-situ bioremediation is most likely to be cost-effective method for petroleum hydrocarbon contamination. But the in-situ bioremediation can require more time to remediate hydrocarbon-contaminated soil and groundwater than other methods. Therefore we intended to save time of in-situ bioremediation using a biological additive to activate indigenous microbes in soil. The additive, 'Inipol EAP 22' stimulates the growth of specific flora, significantly accelerating the speed at which hydrocarbons are biodegraded. And it hans been tested in accordance with protocol approved by the USEPA and is registered on the National Contingency Plan Product Schedule List. In the experiment, three soil samples contaminated with fuel oil were prepared in the same concentration. Inipol EAP 22 was not added to one sample and was added to the other two samples with 5% and 10% of hydrocarbon by weight respectively. And $CO_2$gas derived from bacterial respiration was analyzed in each samples for 15 days. As a result, 145% and 153% of $CO_2$ evolution (microbial respiration) against the sample without 'Inipol EAP 22' occurred in samples with 'Inipol EAP 22' addition of 5% and 10%, respectively