Pub Date : 1900-01-01DOI: 10.1109/IPEC.2005.207069
H. Bevrani, T. Hiyama
This paper addresses a new method to design a PI-based load-frequency control (LFC) with communication delays. First the LFC problem is reduced to a static output feedback control synthesis for a multiple delays power system, and then the control parameters are easily carried out via a mixed H2/Hinfin control technique, using a developed iterative linear matrix inequalities (ILMI) algorithm. The proposed method is applied to a 3-control area power system and the results are compared with a delayless Hinfin-based control design
{"title":"A control strategy for LFC design with communication delays","authors":"H. Bevrani, T. Hiyama","doi":"10.1109/IPEC.2005.207069","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207069","url":null,"abstract":"This paper addresses a new method to design a PI-based load-frequency control (LFC) with communication delays. First the LFC problem is reduced to a static output feedback control synthesis for a multiple delays power system, and then the control parameters are easily carried out via a mixed H2/Hinfin control technique, using a developed iterative linear matrix inequalities (ILMI) algorithm. The proposed method is applied to a 3-control area power system and the results are compared with a delayless Hinfin-based control design","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"146 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":"123383509","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.2005.207045
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.2005.207068
N. Ramana, R. Sidharth, C.V.K. Kishore, Y. Brundavani
In this paper, an intelligent excitation controller is proposed for the generator, to damp the subsynchronous resonant (SSR) frequency oscillations. The proposed controller's performance is tested on the IEEE second benchmark model for subsynchronous resonance studies. A bypass filter is also included as an aid to the excitation controller in countering the induction generator effect
{"title":"Damping subsynchronous oscillations - an intelligent approach","authors":"N. Ramana, R. Sidharth, C.V.K. Kishore, Y. Brundavani","doi":"10.1109/IPEC.2005.207068","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207068","url":null,"abstract":"In this paper, an intelligent excitation controller is proposed for the generator, to damp the subsynchronous resonant (SSR) frequency oscillations. The proposed controller's performance is tested on the IEEE second benchmark model for subsynchronous resonance studies. A bypass filter is also included as an aid to the excitation controller in countering the induction generator effect","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"59 25","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113957618","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.2005.206893
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.2005.207007
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}
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.2005.206963
H. Schuster, C. Hackl, C. Westermaier, D. Schroder
A time-varying control strategy for speed control of a two-mass flexible servo system with uncertain parameters is investigated. The control strategy is based on a funnel concept, which has only been developed for systems with relative degree one, therefore a direct use in most industrial applications is inhibited. To be applicable for systems with higher relative degree - as the considered servo system - a state-feedback like extension is necessary. The problem of choosing feedback coefficients is solved such that a minimum-phase state-feedback is guaranteed. Especially for electrical drive systems stability is shown, even if not all states are fed back, what reduces the amount of measurement theoretically. However the performance is improved if all states are used for the feedback signal. The goal is to control the speed of a load-mass in the sense of tracking a given reference signal by a prescribed decay of the control error
{"title":"Funnel-control for electrical drives with uncertain parameters","authors":"H. Schuster, C. Hackl, C. Westermaier, D. Schroder","doi":"10.1109/IPEC.2005.206963","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206963","url":null,"abstract":"A time-varying control strategy for speed control of a two-mass flexible servo system with uncertain parameters is investigated. The control strategy is based on a funnel concept, which has only been developed for systems with relative degree one, therefore a direct use in most industrial applications is inhibited. To be applicable for systems with higher relative degree - as the considered servo system - a state-feedback like extension is necessary. The problem of choosing feedback coefficients is solved such that a minimum-phase state-feedback is guaranteed. Especially for electrical drive systems stability is shown, even if not all states are fed back, what reduces the amount of measurement theoretically. However the performance is improved if all states are used for the feedback signal. The goal is to control the speed of a load-mass in the sense of tracking a given reference signal by a prescribed decay of the control error","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"64 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":"121652993","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}
The topic of this paper is to construct the module of the current transformer (CT) basing the Jiles-Atherton (J-A) hysteresis model in electromagnetic transient program (EMTP) and alternative transient program (ATP) simulation. The J-A hysteresis model constitutes of first-order ordinary differential equations and has five parameters that can be determined by measurements of hysteresis loop. According to the description of J-A hysteresis model, we can establish the CT module basing J-A hysteresis model using transient analysis of control systems (TACS) in EMTP. Compared with type 96's CT module with hysteresis characteristic, the simulated result of the CT module basing J-A hysteresis model is apparently different in fault transient situation. Therefore, this proposed CT module basing J-A hysteresis model has not only the analysis capability of the transient situation, but also the flexibility of different point of power circuit
{"title":"Current transformer module basing the Jiles-Atherton hysteresis model in EMTP/ATP simulation","authors":"Shun-Tsai Liu, Sy-Ruen Huang, Hung-Wei Chen, Ting-Yen Hsien","doi":"10.1109/IPEC.2005.206989","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206989","url":null,"abstract":"The topic of this paper is to construct the module of the current transformer (CT) basing the Jiles-Atherton (J-A) hysteresis model in electromagnetic transient program (EMTP) and alternative transient program (ATP) simulation. The J-A hysteresis model constitutes of first-order ordinary differential equations and has five parameters that can be determined by measurements of hysteresis loop. According to the description of J-A hysteresis model, we can establish the CT module basing J-A hysteresis model using transient analysis of control systems (TACS) in EMTP. Compared with type 96's CT module with hysteresis characteristic, the simulated result of the CT module basing J-A hysteresis model is apparently different in fault transient situation. Therefore, this proposed CT module basing J-A hysteresis model has not only the analysis capability of the transient situation, but also the flexibility of different point of power circuit","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"36 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":"122254572","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.2005.206928
S. Kihwele, A. Kyaruzi
A distribution network has been analyzed by using the Simpow simulation software. Some distribution lines and distribution transformer phases were found to be overloaded and unsymmetrical. The paper suggests ways of improving the network by replacing overloaded transformers and distribution lines. Lastly the paper recommends that the loads should be redistributed equally to each phase to alleviate the unsymmetrical problems
{"title":"Study of overloading effect in Temeke distribution network","authors":"S. Kihwele, A. Kyaruzi","doi":"10.1109/IPEC.2005.206928","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206928","url":null,"abstract":"A distribution network has been analyzed by using the Simpow simulation software. Some distribution lines and distribution transformer phases were found to be overloaded and unsymmetrical. The paper suggests ways of improving the network by replacing overloaded transformers and distribution lines. Lastly the paper recommends that the loads should be redistributed equally to each phase to alleviate the unsymmetrical problems","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"15 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":"122305413","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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