Pub Date : 2010-07-25DOI: 10.1109/PES.2010.5589457
R. Schulze, P. Schegner
The outage of a line due to a fault can be expensive, hence the fault has to be cleared as fast as possible. Digital protection relays consist of fault locators based on several methods. Due to the availability of highly accurate GPS based time references the investigation of two-terminal methods combined with signal analysis tools makes sense in the first place.
{"title":"Two-terminal fault location on unsymmetrical transmission lines","authors":"R. Schulze, P. Schegner","doi":"10.1109/PES.2010.5589457","DOIUrl":"https://doi.org/10.1109/PES.2010.5589457","url":null,"abstract":"The outage of a line due to a fault can be expensive, hence the fault has to be cleared as fast as possible. Digital protection relays consist of fault locators based on several methods. Due to the availability of highly accurate GPS based time references the investigation of two-terminal methods combined with signal analysis tools makes sense in the first place.","PeriodicalId":177545,"journal":{"name":"IEEE PES General Meeting","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127298445","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 : 2010-07-25DOI: 10.1109/PES.2010.5589574
T. T. Nguyen, V. Nguyen, B. N. Nguyen
In the context of modeling in the phase-domain multi-conductor distributed-parameter transmission circuit for electromagnetic transient analysis performed in the discrete time domain, the paper develops a method based on passive network synthesis for representing the nonlinear frequency dependence of the characteristic impedance matrix function. The synthesized passive network of interconnected RLC elements preserves at any frequency the inherent stability property of this matrix function for any power transmission circuit. The network parameters are identified using the constrained optimization by which the synthesized network response is matched with the actual response derived from the characteristic impedance matrix. With the trapezoidal rule of numerical integration applied to individual elements of the synthesized network, discrete time-domain recursive sequences are derived, and then included in the overall transmission circuit model. The network synthesis procedure developed is applied to a representative transmission line, and comparative studies indicate high accuracy being achieved.
{"title":"Phase-domain transmission circuit model for electromagnetic transient analysis-representation of characteristic impedance matrix by a passive network","authors":"T. T. Nguyen, V. Nguyen, B. N. Nguyen","doi":"10.1109/PES.2010.5589574","DOIUrl":"https://doi.org/10.1109/PES.2010.5589574","url":null,"abstract":"In the context of modeling in the phase-domain multi-conductor distributed-parameter transmission circuit for electromagnetic transient analysis performed in the discrete time domain, the paper develops a method based on passive network synthesis for representing the nonlinear frequency dependence of the characteristic impedance matrix function. The synthesized passive network of interconnected RLC elements preserves at any frequency the inherent stability property of this matrix function for any power transmission circuit. The network parameters are identified using the constrained optimization by which the synthesized network response is matched with the actual response derived from the characteristic impedance matrix. With the trapezoidal rule of numerical integration applied to individual elements of the synthesized network, discrete time-domain recursive sequences are derived, and then included in the overall transmission circuit model. The network synthesis procedure developed is applied to a representative transmission line, and comparative studies indicate high accuracy being achieved.","PeriodicalId":177545,"journal":{"name":"IEEE PES General Meeting","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127459806","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 : 2010-07-25DOI: 10.1109/PES.2010.5589306
N. Abdel-Karim, Hisham Abdel-Ghaffar
This paper concerns the implications of adding wind power on the Northeast Power Coordinating Council (NPCC) US electric power system operations and costs. Constrained Economic Dispatch Optimization Model (CEDOM) has been performed by utilizing wind power every 10 minutes. We illustrate the results of such economic dispatch on NPCC power system where seasonal wind and load power variations are considered in the CEDOM over three days in different seasons. Analysis of the most congested hour has been investigated and effects of congestion on Locational Marginal Price (LMP) are discussed. Finally, we study the sensitivity of LMP to net power injections and line flows by comparing CEDOM results using AC Optimal Power Flow (ACOPF) with DCOPF. The results indicate a divergence problem occurring at highly injected nodes and a decrease of LMP values in locations with increased net power injections.
{"title":"Operational sensitivities of Northeastern US grid to wind power integration scenarios","authors":"N. Abdel-Karim, Hisham Abdel-Ghaffar","doi":"10.1109/PES.2010.5589306","DOIUrl":"https://doi.org/10.1109/PES.2010.5589306","url":null,"abstract":"This paper concerns the implications of adding wind power on the Northeast Power Coordinating Council (NPCC) US electric power system operations and costs. Constrained Economic Dispatch Optimization Model (CEDOM) has been performed by utilizing wind power every 10 minutes. We illustrate the results of such economic dispatch on NPCC power system where seasonal wind and load power variations are considered in the CEDOM over three days in different seasons. Analysis of the most congested hour has been investigated and effects of congestion on Locational Marginal Price (LMP) are discussed. Finally, we study the sensitivity of LMP to net power injections and line flows by comparing CEDOM results using AC Optimal Power Flow (ACOPF) with DCOPF. The results indicate a divergence problem occurring at highly injected nodes and a decrease of LMP values in locations with increased net power injections.","PeriodicalId":177545,"journal":{"name":"IEEE PES General Meeting","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124986534","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 : 2010-07-25DOI: 10.1109/PES.2010.5589288
R. Majumder, A. Ghosh, G. Ledwich, S. Chakrabarti, Firuz Zare
This paper investigates the possibility of power sharing improvements amongst distributed generators with low cost, low bandwidth communications. Decentralized power sharing or power management can be improved significantly with low bandwidth communication. Utility intranet or a dedicated web based communication can serve the purpose. The effect of network parameter such line impedance, R/X ratio on decentralized power sharing can be compensated with correction in the decentralized control reference quantities through the low bandwidth communication. In this paper, the possible improvement is demonstrated in weak system condition, where the micro sources and the loads are not symmetrical along the rural microgrid with high R/X ratio line, creates challenge for decentralized control. In those cases the web based low bandwidth communication is economic and justified than costly advance high bandwidth communication.
{"title":"Improved power sharing among distributed generators using web based communication","authors":"R. Majumder, A. Ghosh, G. Ledwich, S. Chakrabarti, Firuz Zare","doi":"10.1109/PES.2010.5589288","DOIUrl":"https://doi.org/10.1109/PES.2010.5589288","url":null,"abstract":"This paper investigates the possibility of power sharing improvements amongst distributed generators with low cost, low bandwidth communications. Decentralized power sharing or power management can be improved significantly with low bandwidth communication. Utility intranet or a dedicated web based communication can serve the purpose. The effect of network parameter such line impedance, R/X ratio on decentralized power sharing can be compensated with correction in the decentralized control reference quantities through the low bandwidth communication. In this paper, the possible improvement is demonstrated in weak system condition, where the micro sources and the loads are not symmetrical along the rural microgrid with high R/X ratio line, creates challenge for decentralized control. In those cases the web based low bandwidth communication is economic and justified than costly advance high bandwidth communication.","PeriodicalId":177545,"journal":{"name":"IEEE PES General Meeting","volume":"365 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125830396","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 : 2010-07-25DOI: 10.1109/PES.2010.5590113
S. Dahal, N. Mithulananthan, T. Saha
As the issues on market deregulation and renewable energy utilization are gaining significance, distributed generators are planned and installed in distribution systems to supply consumers directly. The distribution system is, therefore facing new challenges on its dynamic behavior with the addition of new dynamic devices. This paper investigates the small signal stability of renewable energy based distribution system. The distribution system is fed by synchronous, induction and static generators. The voltage controlled and power factor controlled operations of the synchronous generator are also considered. The results showed that wind generator dynamics are very significant in the system oscillations. The solar PV generator improves the small signal behavior of the system. The impact of penetration of renewable energy resources on a system is demonstrated through eigenvalue analyses. The eigenvalue results are corroborated with the help of time domain analysis.
{"title":"Investigation of small signal stability of a renewable energy based electricity distribution system","authors":"S. Dahal, N. Mithulananthan, T. Saha","doi":"10.1109/PES.2010.5590113","DOIUrl":"https://doi.org/10.1109/PES.2010.5590113","url":null,"abstract":"As the issues on market deregulation and renewable energy utilization are gaining significance, distributed generators are planned and installed in distribution systems to supply consumers directly. The distribution system is, therefore facing new challenges on its dynamic behavior with the addition of new dynamic devices. This paper investigates the small signal stability of renewable energy based distribution system. The distribution system is fed by synchronous, induction and static generators. The voltage controlled and power factor controlled operations of the synchronous generator are also considered. The results showed that wind generator dynamics are very significant in the system oscillations. The solar PV generator improves the small signal behavior of the system. The impact of penetration of renewable energy resources on a system is demonstrated through eigenvalue analyses. The eigenvalue results are corroborated with the help of time domain analysis.","PeriodicalId":177545,"journal":{"name":"IEEE PES General Meeting","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125928005","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 : 2010-07-25DOI: 10.1109/PES.2010.5588093
Gong Chengming
Power system analysis algorithms under polar coordinates are traditionally implemented with the polar form complex number, which is abstracted as phase and magnitude. This paper addresses a method to implement the polar form algorithms with the common rectangular form complex number, which is abstracted as real and imaginary parts. The key points of the addressed method are to express the derivatives to polar components under rectangular coordinates, and to rotate and stretch a complex number under rectangular coordinates. With the addressed method, the polar form algorithms can be implemented with direct complex operations and will share more components with rectangular form algorithms.
{"title":"Implementation of polar form algorithms with the rectangular form complex number","authors":"Gong Chengming","doi":"10.1109/PES.2010.5588093","DOIUrl":"https://doi.org/10.1109/PES.2010.5588093","url":null,"abstract":"Power system analysis algorithms under polar coordinates are traditionally implemented with the polar form complex number, which is abstracted as phase and magnitude. This paper addresses a method to implement the polar form algorithms with the common rectangular form complex number, which is abstracted as real and imaginary parts. The key points of the addressed method are to express the derivatives to polar components under rectangular coordinates, and to rotate and stretch a complex number under rectangular coordinates. With the addressed method, the polar form algorithms can be implemented with direct complex operations and will share more components with rectangular form algorithms.","PeriodicalId":177545,"journal":{"name":"IEEE PES General Meeting","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126038150","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 : 2010-07-25DOI: 10.1109/PES.2010.5589357
M. Mojiri, Masoud Karimi Ghartemani, ALireza Bahshai
A method for real-time detection and extraction of individual harmonic and inter-harmonic components in a power signal with potentially time-varying characteristics is presented. The proposed method which is based on the concept of adaptive notch filter (ANF), adaptively decomposes the measured power signal into its constituting components independent of where their frequencies are located. The algorithm provides instantaneous values of the various estimated frequency components in addition to the values of their frequencies, amplitudes and phase angles. The structure and mathematical formulation of the proposed technique including guidelines for its parameter tuning are presented and its performance is studied in a variety of scenarios where the power signal attributes such as fundamental frequency and amplitude undergo variations over time. This study confirms the desirable transient and steady-state performances of the proposed method. As compared with its recently proposed counterpart, the proposed method of this paper obviates the need for using a phase-locked loop (PLL) and hence offers a more simplified structure which makes it more attractive from implementation point of view.
{"title":"Processing of harmonics and inter-harmonics using adaptive notch filter","authors":"M. Mojiri, Masoud Karimi Ghartemani, ALireza Bahshai","doi":"10.1109/PES.2010.5589357","DOIUrl":"https://doi.org/10.1109/PES.2010.5589357","url":null,"abstract":"A method for real-time detection and extraction of individual harmonic and inter-harmonic components in a power signal with potentially time-varying characteristics is presented. The proposed method which is based on the concept of adaptive notch filter (ANF), adaptively decomposes the measured power signal into its constituting components independent of where their frequencies are located. The algorithm provides instantaneous values of the various estimated frequency components in addition to the values of their frequencies, amplitudes and phase angles. The structure and mathematical formulation of the proposed technique including guidelines for its parameter tuning are presented and its performance is studied in a variety of scenarios where the power signal attributes such as fundamental frequency and amplitude undergo variations over time. This study confirms the desirable transient and steady-state performances of the proposed method. As compared with its recently proposed counterpart, the proposed method of this paper obviates the need for using a phase-locked loop (PLL) and hence offers a more simplified structure which makes it more attractive from implementation point of view.","PeriodicalId":177545,"journal":{"name":"IEEE PES General Meeting","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123261564","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 : 2010-07-25DOI: 10.1109/PES.2010.5590164
S. De Rijcke, Paula Souto Peerez, J. Driesen
Wind generation is evolving from single wind turbines to wind power plants with an installed capacity of tens of megawatts. Therefore, wind turbines are also coupled to the transmission grid instead of the distribution grid. Problems arise during grid faults as the behaviour of wind turbines equipped with doubly-fed induction generators differs fundamentally from traditional synchronous generators. The short-circuit behaviour is vital for protection issues. A distance relaying problem in a Belgian grid topology is emphasized and studied. This study concludes that the distance relay is not performing correctly in case of three phase faults. Moreover, varying parameters such as the crowbar resistance and the wind turbine loading have a significant impact on the relay performances.
{"title":"Impact of wind turbines equipped with doubly-fed induction generators on distance relaying","authors":"S. De Rijcke, Paula Souto Peerez, J. Driesen","doi":"10.1109/PES.2010.5590164","DOIUrl":"https://doi.org/10.1109/PES.2010.5590164","url":null,"abstract":"Wind generation is evolving from single wind turbines to wind power plants with an installed capacity of tens of megawatts. Therefore, wind turbines are also coupled to the transmission grid instead of the distribution grid. Problems arise during grid faults as the behaviour of wind turbines equipped with doubly-fed induction generators differs fundamentally from traditional synchronous generators. The short-circuit behaviour is vital for protection issues. A distance relaying problem in a Belgian grid topology is emphasized and studied. This study concludes that the distance relay is not performing correctly in case of three phase faults. Moreover, varying parameters such as the crowbar resistance and the wind turbine loading have a significant impact on the relay performances.","PeriodicalId":177545,"journal":{"name":"IEEE PES General Meeting","volume":"427 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123272719","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 : 2010-07-25DOI: 10.1109/PES.2010.5589914
P. Lombardi, M. Heuer, Z. Styczynski
Due to the high volatility of the oil price, cars producers have been motivated to find new solutions for reducing or eliminating the use of fossil fuel. In the last few years, hybrid vehicles (combustion engine combined with an electric motor) and full electric vehicles (EVs) have been designed and commercialized with relatively good success. Both technologies use batteries to drive an electric motor. Nowadays there are two main options for charging the batteries: ▪ Through the direct connection of the vehicles to the grid, so called V2G ▪ Through a battery switch station (BSS), where the empty batteries are replaced with charged batteries.
{"title":"Battery switch station as storage system in an autonomous power system: Optimization issue","authors":"P. Lombardi, M. Heuer, Z. Styczynski","doi":"10.1109/PES.2010.5589914","DOIUrl":"https://doi.org/10.1109/PES.2010.5589914","url":null,"abstract":"Due to the high volatility of the oil price, cars producers have been motivated to find new solutions for reducing or eliminating the use of fossil fuel. In the last few years, hybrid vehicles (combustion engine combined with an electric motor) and full electric vehicles (EVs) have been designed and commercialized with relatively good success. Both technologies use batteries to drive an electric motor. Nowadays there are two main options for charging the batteries: ▪ Through the direct connection of the vehicles to the grid, so called V2G ▪ Through a battery switch station (BSS), where the empty batteries are replaced with charged batteries.","PeriodicalId":177545,"journal":{"name":"IEEE PES General Meeting","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123309368","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 : 2010-07-25DOI: 10.1109/PES.2010.5590121
Liang Zhou, K. Smedley
This paper describes the design of 1MVA 4.16kV Medium-Voltage motor drive using Hexagram inverter, and is compared to Cascaded H-bridge inverter motor drive system. System design and component selection is elaborated for motor drive system using both topologies. Power loss and reliability is also estimated for comparison purpose. Fault tolerant control is a feature for both motor drive system and is discussed and compared in detail. From the comparison, hexagram inverter appears more advantageous because of less DC bus storage requirement, higher reliability, higher efficiency and simple control.
{"title":"Comparison of Medium-Voltage cascaded H-bridge inverter and Hexagram inverter for motor drive applications","authors":"Liang Zhou, K. Smedley","doi":"10.1109/PES.2010.5590121","DOIUrl":"https://doi.org/10.1109/PES.2010.5590121","url":null,"abstract":"This paper describes the design of 1MVA 4.16kV Medium-Voltage motor drive using Hexagram inverter, and is compared to Cascaded H-bridge inverter motor drive system. System design and component selection is elaborated for motor drive system using both topologies. Power loss and reliability is also estimated for comparison purpose. Fault tolerant control is a feature for both motor drive system and is discussed and compared in detail. From the comparison, hexagram inverter appears more advantageous because of less DC bus storage requirement, higher reliability, higher efficiency and simple control.","PeriodicalId":177545,"journal":{"name":"IEEE PES General Meeting","volume":"529 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123574594","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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