Pub Date : 1900-01-01DOI: 10.1109/IPEC.2005.207045
G. Shrestha, K.C. Lee
The load shedding problem of relatively small power networks has been investigated. Procedures to develop traditional load shedding schemes are reviewed and their implementation in SimuLink/Matlab have been carried out. Simulation studies are presented to verify the performance of these schemes and the likely discrepancies between the simple theoretical design values and the actual simulated performance. The concept of an overall load shedding scheme considering the probabilistic outages of a number of most significant contingencies is proposed. The performance of such a scheme formed by combining the load shedding schemes for two different contingencies has been studied by conducting Monte-Carlo simulation of the system operation. The simulation results provide encouraging results, but more work is needed to formulate the optimal of way of developing these schemes
{"title":"Load shedding schedules considering probabilistic outages","authors":"G. Shrestha, K.C. Lee","doi":"10.1109/IPEC.2005.207045","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207045","url":null,"abstract":"The load shedding problem of relatively small power networks has been investigated. Procedures to develop traditional load shedding schemes are reviewed and their implementation in SimuLink/Matlab have been carried out. Simulation studies are presented to verify the performance of these schemes and the likely discrepancies between the simple theoretical design values and the actual simulated performance. The concept of an overall load shedding scheme considering the probabilistic outages of a number of most significant contingencies is proposed. The performance of such a scheme formed by combining the load shedding schemes for two different contingencies has been studied by conducting Monte-Carlo simulation of the system operation. The simulation results provide encouraging results, but more work is needed to formulate the optimal of way of developing these schemes","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123664973","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206893
Hongwen Yan, Rui Ma, X. Tong
A SLIQ algorithm which use Gini index to select attribute is presented in this paper . How to improve efficiency is also discussed. Some key aspects are introduced, such as splitting for numeric attributes and categorical attributes, presorting techniques, tree pruning, breadth-first growth strategy. A method based on SLIQ is applied to the generation unit's bidding decision system of electricity market. The knowledge that the ability of unit bidding is gained, Taking the market's demand, bidding price and the capacity of bidding unit into consideration, A numerical example has been used to illustrate the effect of the algorithm on generation unit's bidding decision system , This knowledge is very useful in supporting the generating bidding unit to make decisions and the electric agency, PX and ISO to design an optimal trade project
{"title":"SLIQ in data mining and application in the generation unit's bidding decision system of electricity market","authors":"Hongwen Yan, Rui Ma, X. Tong","doi":"10.1109/IPEC.2005.206893","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206893","url":null,"abstract":"A SLIQ algorithm which use Gini index to select attribute is presented in this paper . How to improve efficiency is also discussed. Some key aspects are introduced, such as splitting for numeric attributes and categorical attributes, presorting techniques, tree pruning, breadth-first growth strategy. A method based on SLIQ is applied to the generation unit's bidding decision system of electricity market. The knowledge that the ability of unit bidding is gained, Taking the market's demand, bidding price and the capacity of bidding unit into consideration, A numerical example has been used to illustrate the effect of the algorithm on generation unit's bidding decision system , This knowledge is very useful in supporting the generating bidding unit to make decisions and the electric agency, PX and ISO to design an optimal trade project","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125392163","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207016
Yao Degui, L. Shaolin, Chen Shouju, Yang Fan
Insulators for overhead lines are considered to be of basic importance to the transmission system. This paper describes a new method to check defective ceramic insulators by finding the solution of the inverse problem in the system containing insulators strings. Measure the electric field of given points in the vicinity of high voltage insulators string, calculate the voltage distribution of the insulators by charge simulation method (CSM) and Newton method. Compare it with normal voltage distribution to check whether there are defective insulators in the string and the position of them
{"title":"A new method to detect defective ceramic insulators by charge simulation method","authors":"Yao Degui, L. Shaolin, Chen Shouju, Yang Fan","doi":"10.1109/IPEC.2005.207016","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207016","url":null,"abstract":"Insulators for overhead lines are considered to be of basic importance to the transmission system. This paper describes a new method to check defective ceramic insulators by finding the solution of the inverse problem in the system containing insulators strings. Measure the electric field of given points in the vicinity of high voltage insulators string, calculate the voltage distribution of the insulators by charge simulation method (CSM) and Newton method. Compare it with normal voltage distribution to check whether there are defective insulators in the string and the position of them","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"290 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122693594","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207002
Yuanzhan Sun, Lin Cheng, Haitao Liu, Shan He
Traditional reliability evaluation theory, which reflects long-term average reliability level of power systems in the typical operating mode, ignores the impact of real-time operating conditions on system's reliability, so that the system's reliability level in fault states or special operating modes can not be expressed. In order to evaluate power system's reliability in realtime operating states, the concept and algorithm of operational reliability are proposed for the first time. Analyzing the impact of such operating conditions as transfer capacity of lines, bus voltage and system frequency on failure probability of components, component's reliability models based on real-time operating conditions are established in the algorithm of operational reliability. Fault consequences are analyzed with the influence of operating conditions, such as power generation dispatch, load level and network configuration. The evaluation results of a simple system show that real-time operating conditions have a strong impact on system's operational reliability which can be reflected by the presented algorithm
{"title":"Power system operational reliability evaluation based on real-time operating state","authors":"Yuanzhan Sun, Lin Cheng, Haitao Liu, Shan He","doi":"10.1109/IPEC.2005.207002","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207002","url":null,"abstract":"Traditional reliability evaluation theory, which reflects long-term average reliability level of power systems in the typical operating mode, ignores the impact of real-time operating conditions on system's reliability, so that the system's reliability level in fault states or special operating modes can not be expressed. In order to evaluate power system's reliability in realtime operating states, the concept and algorithm of operational reliability are proposed for the first time. Analyzing the impact of such operating conditions as transfer capacity of lines, bus voltage and system frequency on failure probability of components, component's reliability models based on real-time operating conditions are established in the algorithm of operational reliability. Fault consequences are analyzed with the influence of operating conditions, such as power generation dispatch, load level and network configuration. The evaluation results of a simple system show that real-time operating conditions have a strong impact on system's operational reliability which can be reflected by the presented algorithm","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128648811","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207073
Qiao-lin Ding, Jing Tang, Jianxin Liu
This paper provides a framework to obtain some optimal strategies according to different risk analysis and decisions. An optimization process is used to find the optimal production for forecasted price and several boundary prices which are defined based on different confidence level of price probability distribution. Market participants would select their most interesting prices related to its attitude depends on its degree of risk aversion to construct the bidding strategy. The main contribution of this work is a methodology to find a bidding strategy. The new optimal bidding strategy composed of curves with optimal offer blocks where only information related to forecasted demand and market-clearing prices is required shows its superiority to others
{"title":"A new optimal bidding strategy based on risk aversion attitude of power market suppliers","authors":"Qiao-lin Ding, Jing Tang, Jianxin Liu","doi":"10.1109/IPEC.2005.207073","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207073","url":null,"abstract":"This paper provides a framework to obtain some optimal strategies according to different risk analysis and decisions. An optimization process is used to find the optimal production for forecasted price and several boundary prices which are defined based on different confidence level of price probability distribution. Market participants would select their most interesting prices related to its attitude depends on its degree of risk aversion to construct the bidding strategy. The main contribution of this work is a methodology to find a bidding strategy. The new optimal bidding strategy composed of curves with optimal offer blocks where only information related to forecasted demand and market-clearing prices is required shows its superiority to others","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130718632","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206988
H. Heydari, S.H. Pedramrazi, F. Faghihi
The leakage reactance is the most effective parameter in voltage drop in transformers and it's depending on leakage flux in windings area. The windings area is dependent on current density in windings conductor, so windings area varies with the current density. Two different current density in transformer shows that the leakage reactance is dependent on current density in windings conductor and higher current density lead to less leakage reactance and less voltage drop. The comparison of simulation results in two different cases confirms the effects of current density on leakage reactance
{"title":"The effects of windings current density values on leakage reactance in a 25 kA current injection transformer","authors":"H. Heydari, S.H. Pedramrazi, F. Faghihi","doi":"10.1109/IPEC.2005.206988","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206988","url":null,"abstract":"The leakage reactance is the most effective parameter in voltage drop in transformers and it's depending on leakage flux in windings area. The windings area is dependent on current density in windings conductor, so windings area varies with the current density. Two different current density in transformer shows that the leakage reactance is dependent on current density in windings conductor and higher current density lead to less leakage reactance and less voltage drop. The comparison of simulation results in two different cases confirms the effects of current density on leakage reactance","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130368057","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207017
H. Koch
Bottle-necks in the transmission network are strongly influencing the net reliability and the cost for transmission. Reliability is reduced because of the more likeliness of shut downs of overloaded transmission lines. Higher cost are coming from the high loaded overhead lines where thermal limit temperatures of 80degC or 90degC or even more can be reached. This thermal transmission losses are increasing the transmission cost significantly. Bottle-necks are also a consequence of increasing power transmission and the too slow upgrade of the transmission network. In some cases the load can reach values which are at the limits of transmission capability of overhead lines, which is at rated currents of about 3000 A. To improve the bottle-neck situation in a transmission network some technical solutions are available like new or upgraded overhead lines, power flow control (FACTS), power factor compensation, additional underground transmission systems (cables and GIL)
{"title":"Influences of bottle-necks in the transmission network","authors":"H. Koch","doi":"10.1109/IPEC.2005.207017","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207017","url":null,"abstract":"Bottle-necks in the transmission network are strongly influencing the net reliability and the cost for transmission. Reliability is reduced because of the more likeliness of shut downs of overloaded transmission lines. Higher cost are coming from the high loaded overhead lines where thermal limit temperatures of 80degC or 90degC or even more can be reached. This thermal transmission losses are increasing the transmission cost significantly. Bottle-necks are also a consequence of increasing power transmission and the too slow upgrade of the transmission network. In some cases the load can reach values which are at the limits of transmission capability of overhead lines, which is at rated currents of about 3000 A. To improve the bottle-neck situation in a transmission network some technical solutions are available like new or upgraded overhead lines, power flow control (FACTS), power factor compensation, additional underground transmission systems (cables and GIL)","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131031460","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207010
Yue Yuan, P. Ju, Qiang Li, Yongzhi Wang, H. Hu, H. Sasaki
In this paper, a mathematical model for analyzing power system steady state angle stability based on WAMS (wide area measurement system) is established. By adopting a practical simplified methodology, we may obtain real-time information related to the steady state angle stability of power system. The results of the example illustrated in the paper justify the feasibility of the proposed method. And it is proved that the method has great potential for practical use
{"title":"A real-time monitoring method for power system steady state angle stability based on WAMS","authors":"Yue Yuan, P. Ju, Qiang Li, Yongzhi Wang, H. Hu, H. Sasaki","doi":"10.1109/IPEC.2005.207010","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207010","url":null,"abstract":"In this paper, a mathematical model for analyzing power system steady state angle stability based on WAMS (wide area measurement system) is established. By adopting a practical simplified methodology, we may obtain real-time information related to the steady state angle stability of power system. The results of the example illustrated in the paper justify the feasibility of the proposed method. And it is proved that the method has great potential for practical use","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130671586","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 : 1900-01-01DOI: 10.1109/IPEC.2005.206895
T. Chandler
The rapid development of ICT technology, power metering technology and power monitoring knowledge base has had a very significant impact on AMR and power monitoring in the past few years. Historically power monitoring systems have been either automated meter reading (AMR) or power quality and power usage (PQ) monitoring systems. As the network technology, communication protocols and computing power technology increased the costs have decreased and we are observing a merger of the system capabilities. New AMR systems combine some PQ functions and PQ monitoring systems include AMR functions. These are accomplished with automatic dialup or networked systems with automatic power flow, power usage, Kvar and PF as well as automatic event alarming, long-term data management with trending and automatic report generation. The next generation power monitoring systems include multilevel AMR with PQ monitoring with WIFI connection and intelligent monitoring systems. These intelligent monitoring systems will provide the power usage data for AMR parameters such as PF, KVAR, time of usage and include instantaneous event analysis, automatic event categorization, automatic distant to fault calculation and automatic trending of power all parameters
{"title":"The technology development of automatic metering and monitoring systems","authors":"T. Chandler","doi":"10.1109/IPEC.2005.206895","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206895","url":null,"abstract":"The rapid development of ICT technology, power metering technology and power monitoring knowledge base has had a very significant impact on AMR and power monitoring in the past few years. Historically power monitoring systems have been either automated meter reading (AMR) or power quality and power usage (PQ) monitoring systems. As the network technology, communication protocols and computing power technology increased the costs have decreased and we are observing a merger of the system capabilities. New AMR systems combine some PQ functions and PQ monitoring systems include AMR functions. These are accomplished with automatic dialup or networked systems with automatic power flow, power usage, Kvar and PF as well as automatic event alarming, long-term data management with trending and automatic report generation. The next generation power monitoring systems include multilevel AMR with PQ monitoring with WIFI connection and intelligent monitoring systems. These intelligent monitoring systems will provide the power usage data for AMR parameters such as PF, KVAR, time of usage and include instantaneous event analysis, automatic event categorization, automatic distant to fault calculation and automatic trending of power all parameters","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126080613","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 : 1900-01-01DOI: 10.1109/IPEC.2005.207007
Wang Peng, W. Yanhong, Yang Huachun, M. Rui, Huang Guoqiang, H. Renmu
Practical load model is of great importance for the power system planning, design and operation. The characteristic of traditional dynamic load model are physical meaning clear and concise, easy for analyzing and optimization, but also have disadvantage. The idea of model representability is proposed in this paper, together with the quantitative index and three qualitative indexes for it. On this basis, the fuzzy comprehensive evaluation method of fuzzy set theory is adopted to scale the model's integrated representability, which is used as the constraint for model identification optimization reconstruction. The case study clarifies the rationality of the indexes for the model's integrated representability and its function in parameter identification
{"title":"Study on model's integrated representability and modeling method of power load","authors":"Wang Peng, W. Yanhong, Yang Huachun, M. Rui, Huang Guoqiang, H. Renmu","doi":"10.1109/IPEC.2005.207007","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207007","url":null,"abstract":"Practical load model is of great importance for the power system planning, design and operation. The characteristic of traditional dynamic load model are physical meaning clear and concise, easy for analyzing and optimization, but also have disadvantage. The idea of model representability is proposed in this paper, together with the quantitative index and three qualitative indexes for it. On this basis, the fuzzy comprehensive evaluation method of fuzzy set theory is adopted to scale the model's integrated representability, which is used as the constraint for model identification optimization reconstruction. The case study clarifies the rationality of the indexes for the model's integrated representability and its function in parameter identification","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126199260","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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