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This paper presents the voltage operation guidelines for the 345 kV substations of Korea power system. We used SVR(secondary voltage regulation) theory for the development of Guidelines. For the division of control areas CESI algorithm was used and EMS snapshot PSS/E datas were used for the study. The best target voltages for the pilot(reference) buses were calculated by optimal power flow. By analyzing...
Based on compact towers already built in China and other countries, structural projects of 750 kV compact towers are confirmed. As for 750 kV double circuit and single circuit compact towers, structural calculation and economical analysis are carried out on two aspects, steel tubes and high strength angles. Suitable structural projects are recommended correspondingly. Test and research on padding...
The latest technology development makes many intelligent electronic devices (IEDs) available in substations today. This brings an opportunity for adding new functionalities that go well beyond what the traditional substation automation solutions have provided. The substation automation role in automated fault analysis may be expanding towards better serving many utility groups: operations, protection...
Both IEC 61850 and IEC 61970 define the access mechanism to the substation electric utility's data and data architecture. But they use a different approach in the access mechanism. IEC 61850 is defined from the internal communication standpoint whereas IEC 61970 is from the substation management standpoint. Thus, harmonization is required to integrate both sides. In this paper, we'll discuss about...
The new concept of customer infrastructure that can improve energy efficiency and accept various distributed energy resources for the electric industry to grow constantly for the next decades solving global energy security crisis and global warming problem from excessive CO2 emission. AMI (advanced metering infrastructure), the customer service infrastructure between the end user and the electric...
The purpose of this study is to realize a practical method of providing cyber security for power system communications. Power system communications can be classified into three main categories: real-time protection, supervisory control and data acquisition (SCADA), and remote access. This paper describes a concept and method of effectively applying information-theoretic cryptography to real-time protection...
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As one of the renewable and clean energy resources, wind power is attracting considerable attention and becoming most developing renewable energy resources due to its large unit capacity, etc. However, in some areas of the world, such as in Japan, there are some geographical and electrical restrictions for land wind generation. Since few suitable construction sites can be found and the power system...
This paper presents a fuzzy methodology for solving thermal unit commitment problem integrated with solar energy system using differential evolution approach. Solar energy with battery is integrated with the model due to lower electric cost and positive effect on the environment. Such inclusion of intermittent solar energy with thermal power generators, requires sophisticated methodology since the...
This paper presents a methodology for determining optimal generation schedule for thermal units by using a combined approach of particle swarm optimization (PSO) and dynamic programming (DP). At first, the units are decomposed into several hours based on the forecasted load demand. Then unit commitment (UC) problem is solved for each single hour using binary version of PSO. While solving hourly UC,...
This paper presents a stochastic optimization method to solve an integrated generation and transmission planning problem under uncertainty. The two-stage decomposition method is combined with gradient radar step (GRS) to enhance the computational efficiency. The numerical results are presented to validate the effectiveness of the proposed method.
The circulating current on the delta side of wye-delta connected three-phase power transformer is hard to measure. The differential transformer protection has to adopt current phase compensation method to compensate the circulating current. However, the differential current hardly reflect the magnetic exciting current of transformer no matter what kind of current phase compensation methods used. It...
This paper proposes the approach to reduce the prediction error at occurrence time of peak electricity price, and aims to enhance the accuracy of next day electricity price forecasting. In the proposed method, the weekly variation data is used for input factors of the NN at occurrence time of peak electricity price in order to catch the price variation. Moreover, learning data for the neural network...
This paper proposes CBL calculation method that uses exponential smoothing model with weather adjustment multiplicative. It can estimate the daily electric load patterns of customers who participate in a demand response program. The proposed method is designed to estimate CBL using exponential smoothing model. The proposed method adopts weather adjustment for compensating CBL because the weather has...
The Korean energy management system (K-EMS) development project, which includes the development of the dispatcher training simulator (DTS), has been underway since 2005. The DTS provides a realistic environment for system dispatchers to practice operating tasks and experience emergency operating situations. In order to provide a realistic environment, the DTS includes many dynamic models of power...
This paper proposes a compensating algorithm for the secondary current of the measurement current transformer (CT) that removes the effects of the hysteresis characteristics of the iron-core. The exciting current resulting from the hysteresis characteristics of the core causes an error between the primary current and the secondary current of the CT. The proposed algorithm decomposes the exciting current...
To investigate and evaluate the mechanics of how failures spread in power grids, this paper introduces a methodology for a credible list of critical N-k contingencies that would threaten the grids. The methodology is based on the concept of delta centrality. The list of critical contingencies will provide the look-ahead situation awareness for operators on any impending large power grid blackouts...
This paper deals with the optimal countermeasures for the mal-function of protective devices at primary feeder in distribution systems when new power sources like photovoltaic (PV) systems are interconnected, based on the symmetrical components of short circuit studies. When new power sources are considered to be interconnected to distribution systems, bi-directional power flow and interconnection...
Remote control switches (RCS) can improve reliability of a power system by reducing the total time of fault detection, isolation and restoration. DGs can improve reliability of system if they can provide the loads after switches performance to isolate faults. Then places and sizes of DGs and places of switches have significant effect on reliability improvement. In this paper a dynamic preprocessed...
Function and role of electricity meter is changing significantly along with IT technology development. In North America and Europe area, especially, and major electric power companies in the world, demand for mechanical electricity meter is decreasing while electronic electricity meter implementation is continually increasing. Korea Electric Power Corporation (KEPCO), a Korean electric power company,...
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