Pub Date : 1900-01-01DOI: 10.1109/IPEC.2005.207012
N. Yousif, M. Al-Dabbagh
In this paper, a new application of time frequency distribution algorithm (TFD) is introduced for analyzing subsynchronous resonance (SSR). A computation algorithm is derived to utilize the information obtained from TFD for detecting of subsynchronous modes. Three different study systems with different network configuration and different series compensation arrangements are used to measure the effectiveness of TFD and the computation algorithm in detecting network eigenvalues. Comparison between the results obtained from TFD computation algorithm and from the mathematical model is presented for each study system
{"title":"Time-frequency distribution application for sub-synchronous resonance analysis in power systems","authors":"N. Yousif, M. Al-Dabbagh","doi":"10.1109/IPEC.2005.207012","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207012","url":null,"abstract":"In this paper, a new application of time frequency distribution algorithm (TFD) is introduced for analyzing subsynchronous resonance (SSR). A computation algorithm is derived to utilize the information obtained from TFD for detecting of subsynchronous modes. Three different study systems with different network configuration and different series compensation arrangements are used to measure the effectiveness of TFD and the computation algorithm in detecting network eigenvalues. Comparison between the results obtained from TFD computation algorithm and from the mathematical model is presented for each study system","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"12 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":"131762033","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.2005.206938
E.M. Yap, M. Al-Dabbagh, P. Thum
This paper presents the effective use of a unified power flow controller (UPFC) and its characteristics in a computational approach. To demonstrate the flexibility of UPFC in controlling line flow transmission, a 5-bus network system is developed with line(s) congestion and operated as per-normal flow to identify the cause of line congestion and also possible solutions in mitigating the congestion with UPFC, effectively. The programs used in this study are power world simulator (PWS) and power system analysis toolbox (PSAT). The use of PSAT is reported and discussed along with its requirements of operation and its newly developed features. The embedment of UPFC in PSAT using Matlab as platform applicator to solve line congestion in steady-state condition is also explained. The use of UPFC in network planning of rural electrification is proposed at the end of the paper
本文从计算的角度介绍了统一潮流控制器(UPFC)的有效使用及其特点。为了展示UPFC在控制线路流传输方面的灵活性，我们开发了一个5总线网络系统，在线路拥塞的情况下，以超正常流的方式运行，以确定线路拥塞的原因，并找到有效缓解UPFC拥塞的可能解决方案。本研究使用电力世界模拟器(power world simulator, PWS)和电力系统分析工具箱(power system analysis toolbox, PSAT)。对PSAT的应用进行了报道和讨论，并对其操作要求和新发展的特点进行了讨论。介绍了在PSAT中使用Matlab作为平台应用程序嵌入UPFC以解决稳态情况下的线路拥塞问题。最后提出了UPFC在农村电气化网络规划中的应用
{"title":"UPFC controller in mitigating line congestion for cost-efficient power delivery","authors":"E.M. Yap, M. Al-Dabbagh, P. Thum","doi":"10.1109/IPEC.2005.206938","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206938","url":null,"abstract":"This paper presents the effective use of a unified power flow controller (UPFC) and its characteristics in a computational approach. To demonstrate the flexibility of UPFC in controlling line flow transmission, a 5-bus network system is developed with line(s) congestion and operated as per-normal flow to identify the cause of line congestion and also possible solutions in mitigating the congestion with UPFC, effectively. The programs used in this study are power world simulator (PWS) and power system analysis toolbox (PSAT). The use of PSAT is reported and discussed along with its requirements of operation and its newly developed features. The embedment of UPFC in PSAT using Matlab as platform applicator to solve line congestion in steady-state condition is also explained. The use of UPFC in network planning of rural electrification is proposed at the end of the paper","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"27 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":"133861315","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.2005.207046
Wenyuan Li, Jiping Lu, Wei Yan
This paper presents a method to develop and incorporate a reliability component in transmission pricing. The method includes the following three tasks: developing a technique to establish an unit reliability value; quantifying impacts of customer on system reliability; and incorporating the reliability component in the rate design. The proposed method calculates the charge or credit to a native, wheeling, or generation customer in terms of its impact on system reliability. Incorporation of the reliability component will force all players in the system (the utility and customers) to share their responsibility in system reliability through a price signal and provide an incentive message to encourage the right siting of new generations. The method also reflects the long run incremental investment requirement of a transmission company. The procedure of the proposed method has been explained using the BC Hydro system in Canada as an example
{"title":"Reliability component in transmission service pricing","authors":"Wenyuan Li, Jiping Lu, Wei Yan","doi":"10.1109/IPEC.2005.207046","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207046","url":null,"abstract":"This paper presents a method to develop and incorporate a reliability component in transmission pricing. The method includes the following three tasks: developing a technique to establish an unit reliability value; quantifying impacts of customer on system reliability; and incorporating the reliability component in the rate design. The proposed method calculates the charge or credit to a native, wheeling, or generation customer in terms of its impact on system reliability. Incorporation of the reliability component will force all players in the system (the utility and customers) to share their responsibility in system reliability through a price signal and provide an incentive message to encourage the right siting of new generations. The method also reflects the long run incremental investment requirement of a transmission company. The procedure of the proposed method has been explained using the BC Hydro system in Canada as an example","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"188 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":"116661993","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.2005.206999
C. Collins, N. Watson, A. Wood
This paper presents a non-linear harmonic domain model for the static synchronous series compensator (SSSC). The model incorporates a fundamental frequency three-phase power-flow and a harmonic converter representation. This combination accounts for system imbalance and the resultant non-characteristic harmonic generation. The proposed unified solution format uses a single iterative loop eliminating unnecessary assumptions regarding the operating point. The models performance is validated against time domain simulation for an unbalanced test system. This test system is then used to illustrate the impact of transmission lines on the harmonic performance of a static synchronous series compensator, particularly with respect to additional harmonic transfers. Reinforcing the importance of comprehensive three-phase modelling when considering flexible AC transmission system (FACTS) devices
{"title":"Unbalanced SSSC modelling in the harmonic domain","authors":"C. Collins, N. Watson, A. Wood","doi":"10.1109/IPEC.2005.206999","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206999","url":null,"abstract":"This paper presents a non-linear harmonic domain model for the static synchronous series compensator (SSSC). The model incorporates a fundamental frequency three-phase power-flow and a harmonic converter representation. This combination accounts for system imbalance and the resultant non-characteristic harmonic generation. The proposed unified solution format uses a single iterative loop eliminating unnecessary assumptions regarding the operating point. The models performance is validated against time domain simulation for an unbalanced test system. This test system is then used to illustrate the impact of transmission lines on the harmonic performance of a static synchronous series compensator, particularly with respect to additional harmonic transfers. Reinforcing the importance of comprehensive three-phase modelling when considering flexible AC transmission system (FACTS) devices","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"60 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":"116701157","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.2005.206899
Zhongxu Li, Yutian Liu
As a novel computation mode, the methodology of grid computing can exploit geographically and organizationally distributed computational resources for solving reactive power optimization problems. A grid-computing architecture for reactive power optimization is designed herein. Considering the characteristics of reactive power, a large-scale power system can be divided into many small-scale subsystems according to administrative domain and network structure. The optimization subproblems for corresponding subsystems can be worked out autonomously by agents, which are wrapped into grid services. The agents are diverse in objective functions, optimization algorithms and power flow algorithms. Grid computing technology is adopted to integrate the heterogeneous computational resources, which are distributed to different subsystems and dominated by different control centers. The simulation results of a practical power system show the feasibility of the proposed method
{"title":"Reactive power optimization using agent-based grid computing","authors":"Zhongxu Li, Yutian Liu","doi":"10.1109/IPEC.2005.206899","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206899","url":null,"abstract":"As a novel computation mode, the methodology of grid computing can exploit geographically and organizationally distributed computational resources for solving reactive power optimization problems. A grid-computing architecture for reactive power optimization is designed herein. Considering the characteristics of reactive power, a large-scale power system can be divided into many small-scale subsystems according to administrative domain and network structure. The optimization subproblems for corresponding subsystems can be worked out autonomously by agents, which are wrapped into grid services. The agents are diverse in objective functions, optimization algorithms and power flow algorithms. Grid computing technology is adopted to integrate the heterogeneous computational resources, which are distributed to different subsystems and dominated by different control centers. The simulation results of a practical power system show the feasibility of the proposed method","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"4 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":"116844387","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.2005.206922
Y. Q. Zhan, Y. H. Li, S. Choi, S. Rajakaruna, D. M. Vilathgamuwa
Some results obtained on the design of power quality control center (PQCC) are described. The Center, consisting of two back-to-back power converters, a DC-bus and a solid-oxide fuel cell (SOFC) distributed generator, provides varied levels of power quality services to meet the load requirements. Based on the concept of feasible operating area of the SOFC, it is shown that the ability of the PQCC to accommodate instantaneous power demand change is constrained. A feasible PQCC operating scheme is then proposed. It exploits fully the ability of the converters and the SOFC to respond to external disturbances. Furthermore, by incorporating a series compensator into the PQCC, it is shown that load ride-through capability under voltage disturbance conditions can be extended considerably. Two possible PQCC-SC structures have been considered and simulation results are used to illustrate the efficacy of the proposed schemes
{"title":"Some recent results on the design of power quality control center","authors":"Y. Q. Zhan, Y. H. Li, S. Choi, S. Rajakaruna, D. M. Vilathgamuwa","doi":"10.1109/IPEC.2005.206922","DOIUrl":"https://doi.org/10.1109/IPEC.2005.206922","url":null,"abstract":"Some results obtained on the design of power quality control center (PQCC) are described. The Center, consisting of two back-to-back power converters, a DC-bus and a solid-oxide fuel cell (SOFC) distributed generator, provides varied levels of power quality services to meet the load requirements. Based on the concept of feasible operating area of the SOFC, it is shown that the ability of the PQCC to accommodate instantaneous power demand change is constrained. A feasible PQCC operating scheme is then proposed. It exploits fully the ability of the converters and the SOFC to respond to external disturbances. Furthermore, by incorporating a series compensator into the PQCC, it is shown that load ride-through capability under voltage disturbance conditions can be extended considerably. Two possible PQCC-SC structures have been considered and simulation results are used to illustrate the efficacy of the proposed schemes","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"1 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":"116657685","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}
Pub Date : 1900-01-01DOI: 10.1109/IPEC.2005.207020
S. Amrei, D. Xu, Y. Lang
DC/DC switching converters have been used in many applications in recent years. The sliding mode control based on VSS (variable structure system) theory has been examined for all switch mode converter types, whilst current mode (CM) control scheme is particularly applied to DC/DC converters. In this paper, a new control strategy by compromising both schemes and derivation of dynamic current reference is proposed, analyzed and simulated. Moreover, considerations for realization with DSP controllers are addressed
{"title":"High power DC-DC converters under large load and input voltage variations: a new approach","authors":"S. Amrei, D. Xu, Y. Lang","doi":"10.1109/IPEC.2005.207020","DOIUrl":"https://doi.org/10.1109/IPEC.2005.207020","url":null,"abstract":"DC/DC switching converters have been used in many applications in recent years. The sliding mode control based on VSS (variable structure system) theory has been examined for all switch mode converter types, whilst current mode (CM) control scheme is particularly applied to DC/DC converters. In this paper, a new control strategy by compromising both schemes and derivation of dynamic current reference is proposed, analyzed and simulated. Moreover, considerations for realization with DSP controllers are addressed","PeriodicalId":164802,"journal":{"name":"2005 International Power Engineering Conference","volume":"105 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":"123243418","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.2005.207069
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}
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