Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356862
Jin-a Kim, Jaehee Lee, Sung-Kwan Joo
This paper presents a risk assessment method to measure the Conditional Value at Risk (CVaR) of a transmission expansion project using the Cross-Entropy (CE) method. In the transmission investment, there are various uncertainties such as demand, fuel costs and electricity prices. These uncertain factors can influence the future cash flow of a transmission expansion project and become risk factors for an investor. The CVaR can be used to give an investor an accurate indication of the potential losses for the transmission investment. However, the use of the Crude Monte Carlo (CMC) method in CVaR calculation requires a large computational effort to obtain reliable results. In this paper, the CE method is applied to reduce the computational effort in the CVaR calculation. A numerical example is presented to illustrate the effectiveness of the proposed CE-based CVaR method.
{"title":"Assessment of Conditional Value at Risk (CVaR) in transmission investment using Cross Entropy method","authors":"Jin-a Kim, Jaehee Lee, Sung-Kwan Joo","doi":"10.1109/TD-ASIA.2009.5356862","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356862","url":null,"abstract":"This paper presents a risk assessment method to measure the Conditional Value at Risk (CVaR) of a transmission expansion project using the Cross-Entropy (CE) method. In the transmission investment, there are various uncertainties such as demand, fuel costs and electricity prices. These uncertain factors can influence the future cash flow of a transmission expansion project and become risk factors for an investor. The CVaR can be used to give an investor an accurate indication of the potential losses for the transmission investment. However, the use of the Crude Monte Carlo (CMC) method in CVaR calculation requires a large computational effort to obtain reliable results. In this paper, the CE method is applied to reduce the computational effort in the CVaR calculation. A numerical example is presented to illustrate the effectiveness of the proposed CE-based CVaR method.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114182393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356825
Jiyoung Song, Kyebyung Lee, Hansang Lee, G. Jang, Sae-Hyuk Kwon, Hanmin Lee, Changmu Lee, Gildong Kim
As the importance of the improvement of energy efficiency is constantly increasing, a study has been done on the implementation of an energy storage system, to improve load efficiency, on the railway which has relatively large regenerative energy. The pre-existing regenerative energy not only has a low efficiency but also increases the catenary, which has a possibility to create problems in the electrical device voltage, during the regeneration process. In this paper, the improvement of the efficiency and stabilization of the catenary voltage by the implementation of an energy storage device is being discussed. The composition of the interface, control strategy and reduced railway model for simulation are being proposed.
{"title":"Interface composition and reduced railway model to verify the effect of supercapacitor applied to railway system","authors":"Jiyoung Song, Kyebyung Lee, Hansang Lee, G. Jang, Sae-Hyuk Kwon, Hanmin Lee, Changmu Lee, Gildong Kim","doi":"10.1109/TD-ASIA.2009.5356825","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356825","url":null,"abstract":"As the importance of the improvement of energy efficiency is constantly increasing, a study has been done on the implementation of an energy storage system, to improve load efficiency, on the railway which has relatively large regenerative energy. The pre-existing regenerative energy not only has a low efficiency but also increases the catenary, which has a possibility to create problems in the electrical device voltage, during the regeneration process. In this paper, the improvement of the efficiency and stabilization of the catenary voltage by the implementation of an energy storage device is being discussed. The composition of the interface, control strategy and reduced railway model for simulation are being proposed.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114487536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356902
Z. Vale, C. Ramos, H. Morais, P. Faria, Marco Silva
Power systems are planed and operated according to the optimization of the available resources. Traditionally these tasks were mostly undertaken in a centralized way which is no longer adequate in a competitive environment. Demand response can play a very relevant role in this context but adequate tools to negotiate this kind of resources are required. This paper presents an approach to deal with these issues, by using a multi-agent simulator able to model demand side players and simulate their strategic behavior. The paper includes an illustrative case study that considers an incident situation. The distribution company is able to reduce load curtailment due to load flexibility contracts previously established with demand side players.
{"title":"The role of demand response in future power systems","authors":"Z. Vale, C. Ramos, H. Morais, P. Faria, Marco Silva","doi":"10.1109/TD-ASIA.2009.5356902","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356902","url":null,"abstract":"Power systems are planed and operated according to the optimization of the available resources. Traditionally these tasks were mostly undertaken in a centralized way which is no longer adequate in a competitive environment. Demand response can play a very relevant role in this context but adequate tools to negotiate this kind of resources are required. This paper presents an approach to deal with these issues, by using a multi-agent simulator able to model demand side players and simulate their strategic behavior. The paper includes an illustrative case study that considers an incident situation. The distribution company is able to reduce load curtailment due to load flexibility contracts previously established with demand side players.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125687605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356950
Peng Gao, Libao Shi, L. Yao, Y. Ni, M. Bazargan
How to identify the weak buses comprehensively and practically in power system voltage stability analysis is an important issue, and is posing great interests to the power engineers. In this paper, a multi-criteria integrated voltage stability index was proposed for weak buses identification. Firstly, the bus voltage change index and reactive power margins, which were determined by P-V curve and Q-V curve, respectively, were employed to form the required data set involving the corresponding bus voltage margin and reactive power margin information. An overall and practical evaluation method called as ideal point method was then proposed to integrate the two aforementioned voltage stability indices with certain weight. By tuning the corresponding weight coefficients, the decision-making reflecting the preference of power engineer could be made. Finally the case studies on the 10-machine 39-bus New England test system as benchmark were carried out to demonstrate the validity and effectiveness of the proposed method.
{"title":"Multi-criteria integrated voltage stability index for weak buses identification","authors":"Peng Gao, Libao Shi, L. Yao, Y. Ni, M. Bazargan","doi":"10.1109/TD-ASIA.2009.5356950","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356950","url":null,"abstract":"How to identify the weak buses comprehensively and practically in power system voltage stability analysis is an important issue, and is posing great interests to the power engineers. In this paper, a multi-criteria integrated voltage stability index was proposed for weak buses identification. Firstly, the bus voltage change index and reactive power margins, which were determined by P-V curve and Q-V curve, respectively, were employed to form the required data set involving the corresponding bus voltage margin and reactive power margin information. An overall and practical evaluation method called as ideal point method was then proposed to integrate the two aforementioned voltage stability indices with certain weight. By tuning the corresponding weight coefficients, the decision-making reflecting the preference of power engineer could be made. Finally the case studies on the 10-machine 39-bus New England test system as benchmark were carried out to demonstrate the validity and effectiveness of the proposed method.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124697444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356860
Jinsu Lee, Hyosang Lee, Sunghak Kim
The West African Power Pool is currently developing the regional electricity market for its member states. As the basic design for the cross-border power trading system for the West African Power Pool, the step-by-step evolution, the Baseline System and the Fullscale System, is estimated. Along with the interconnection project between member countries, the various functions from the data acquisition and processing by the Baseline System to the interchange trading by the Fullscale System will be implemented gradually.
{"title":"Designing the cross-border power trading system for West African Power Pool","authors":"Jinsu Lee, Hyosang Lee, Sunghak Kim","doi":"10.1109/TD-ASIA.2009.5356860","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356860","url":null,"abstract":"The West African Power Pool is currently developing the regional electricity market for its member states. As the basic design for the cross-border power trading system for the West African Power Pool, the step-by-step evolution, the Baseline System and the Fullscale System, is estimated. Along with the interconnection project between member countries, the various functions from the data acquisition and processing by the Baseline System to the interchange trading by the Fullscale System will be implemented gradually.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"636 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125076413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356815
Sung-Hwan Song, Sang-ho Lee, T. Oh, Jinsu Lee
This paper examines the scheme of risk-based contingency analysis for transmission and substation planning. Compared to the traditional approach, in which system reliability is assessed by deterministic ‘n−1’ contingency criteria, the present method can capture the 'risk' concepts consisting of two parameters; 1) the likelihood that some events will happen and 2) the consequences if they do. The key method of this paper is to evaluate the risk considering the event probability such as two transmission lines failure and substation failure, and event consequences such as the amount of load shedding. The presented risk evaluation procedure can provide a single dimension index like 'probability−1 × consequence' representing a contingency severity level. Furthermore it can be a vehicle to perform the probabilistic contingency analysis for transmission and substation planning.
{"title":"Risk-based contingency analysis for transmission and substation planning","authors":"Sung-Hwan Song, Sang-ho Lee, T. Oh, Jinsu Lee","doi":"10.1109/TD-ASIA.2009.5356815","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356815","url":null,"abstract":"This paper examines the scheme of risk-based contingency analysis for transmission and substation planning. Compared to the traditional approach, in which system reliability is assessed by deterministic ‘n−1’ contingency criteria, the present method can capture the 'risk' concepts consisting of two parameters; 1) the likelihood that some events will happen and 2) the consequences if they do. The key method of this paper is to evaluate the risk considering the event probability such as two transmission lines failure and substation failure, and event consequences such as the amount of load shedding. The presented risk evaluation procedure can provide a single dimension index like 'probability−1 × consequence' representing a contingency severity level. Furthermore it can be a vehicle to perform the probabilistic contingency analysis for transmission and substation planning.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125517714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356863
Yu Dai, Hongming Yang, Jiajie Wu, Shaoyuan Lai, Lei Han
Nash equilibrium is an important decision-making result for all players in non-cooperation game, problems of cooperation and competition between power generation group in strategic futures contracts market and the spot market is investigated based on power transmission network constraints. We consider the Cournot game theoretic model to simulate competition between power generation groups, moreover, electricity futures and spot market of the joint non-inferior Nash equilibrium model is established. This model is a multi-layer optimization model. By using the nonlinear complementary function to reformulate the KKT system for the optimization problem, the non-inferior Nash equilibrium of power spot market is solved simply and fast. Corresponding to different operational conditions of power network, i.e., congestion and non-congestion, the non-inferior Nash equilibrium of electricity futures and spot market is analyzed and compared with different market parameters.
{"title":"The joint non-inferior Nash equilibrium analysis of electricity futures and spot market","authors":"Yu Dai, Hongming Yang, Jiajie Wu, Shaoyuan Lai, Lei Han","doi":"10.1109/TD-ASIA.2009.5356863","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356863","url":null,"abstract":"Nash equilibrium is an important decision-making result for all players in non-cooperation game, problems of cooperation and competition between power generation group in strategic futures contracts market and the spot market is investigated based on power transmission network constraints. We consider the Cournot game theoretic model to simulate competition between power generation groups, moreover, electricity futures and spot market of the joint non-inferior Nash equilibrium model is established. This model is a multi-layer optimization model. By using the nonlinear complementary function to reformulate the KKT system for the optimization problem, the non-inferior Nash equilibrium of power spot market is solved simply and fast. Corresponding to different operational conditions of power network, i.e., congestion and non-congestion, the non-inferior Nash equilibrium of electricity futures and spot market is analyzed and compared with different market parameters.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129085230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356916
Wu Zhihua, Li Zewen, Qin Xiao'an, Hu Xiang, Zeng Xiangjun
Quick and accurate location of faults is the basic task of fault location as well as an important research subject in power system relay protection. The traveling wave principles of double terminal fault locating method is described, and the main causes of the generation of errors in actual application are investigated. A novel double terminal fault locating method is presented based on the existing fault locating method. The arriving intervals of the travelling wave from the fault location, reflected wave from fault location and reflected wave from opposite bus are recorded. The new fault location method is applied in Zhuzhou power grid, and the results show that it has high Location accuracy.
{"title":"A novel double terminal traveling wave fault location method not influenced by wave speed","authors":"Wu Zhihua, Li Zewen, Qin Xiao'an, Hu Xiang, Zeng Xiangjun","doi":"10.1109/TD-ASIA.2009.5356916","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356916","url":null,"abstract":"Quick and accurate location of faults is the basic task of fault location as well as an important research subject in power system relay protection. The traveling wave principles of double terminal fault locating method is described, and the main causes of the generation of errors in actual application are investigated. A novel double terminal fault locating method is presented based on the existing fault locating method. The arriving intervals of the travelling wave from the fault location, reflected wave from fault location and reflected wave from opposite bus are recorded. The new fault location method is applied in Zhuzhou power grid, and the results show that it has high Location accuracy.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131815066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5357025
M. Urayama, K. Miyake, K. Takahashi, M. Kawada, S. Fukushima, A. Otsuka, T. Mochizuki
This paper describes an investigation of grease degradation of aged GCBs. Risk of depletion on conducting contacts due to grease degradation in particular was identified in field data. In addition, it was found that grease oil evaporation and abrasion dust infiltration were proportional to ages and numbers of operations respectively. It was also found that grease degradation promoted abrasion in silver-plating on sliding contacts, reaching the abnormal abrasion domain for aged equipment, which increased equipment failure risk. Meanwhile, replacement criteria were organized with asset management based on risk evaluation.
{"title":"Evaluation of deterioration in aged GCBs and study on equipment replacement criteria","authors":"M. Urayama, K. Miyake, K. Takahashi, M. Kawada, S. Fukushima, A. Otsuka, T. Mochizuki","doi":"10.1109/TD-ASIA.2009.5357025","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5357025","url":null,"abstract":"This paper describes an investigation of grease degradation of aged GCBs. Risk of depletion on conducting contacts due to grease degradation in particular was identified in field data. In addition, it was found that grease oil evaporation and abrasion dust infiltration were proportional to ages and numbers of operations respectively. It was also found that grease degradation promoted abrasion in silver-plating on sliding contacts, reaching the abnormal abrasion domain for aged equipment, which increased equipment failure risk. Meanwhile, replacement criteria were organized with asset management based on risk evaluation.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133859567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-18DOI: 10.1109/TD-ASIA.2009.5356816
Jeonje Park, Wu Liang, Jaeseok Choi, A. El-Keib, Mohammad Shahidehpour
This paper proposes a method for choosing the best transmission system expansion plan(TSEP) using nodal/bus delivery marginal rate criterion (BMRk) defined newly in this paper. The objective method minimizes a total cost which is an investment budget for constructing new transmission lines subject to the BMRk which means a nodal deterministic reliability level requirement at specified load point. Test results on an existing 21-bus system are included in the paper. It demonstrated the suitability of the proposed method for solving the TSEPproblem in competitive electricity market environment.
{"title":"Transmission system expansion planning by nodal delivery marginal rate criterion","authors":"Jeonje Park, Wu Liang, Jaeseok Choi, A. El-Keib, Mohammad Shahidehpour","doi":"10.1109/TD-ASIA.2009.5356816","DOIUrl":"https://doi.org/10.1109/TD-ASIA.2009.5356816","url":null,"abstract":"This paper proposes a method for choosing the best transmission system expansion plan(TSEP) using nodal/bus delivery marginal rate criterion (BMRk) defined newly in this paper. The objective method minimizes a total cost which is an investment budget for constructing new transmission lines subject to the BMRk which means a nodal deterministic reliability level requirement at specified load point. Test results on an existing 21-bus system are included in the paper. It demonstrated the suitability of the proposed method for solving the TSEPproblem in competitive electricity market environment.","PeriodicalId":131589,"journal":{"name":"2009 Transmission & Distribution Conference & Exposition: Asia and Pacific","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115107390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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