Pub Date : 2012-12-31DOI: 10.1109/UPEC.2012.6398692
D. Adhikari, D. Hepburn, B. Stewart
Polymeric insulating materials with excellent electrical properties are widely used in electrical power equipment. They are degraded however when they are subjected to partial discharges (PD). Factors which control the PD activity include pressure and type of gas present. The pressure variation in a self-contained void will differ from that in voids with channels; also a void with a channel connected to external atmosphere can have the gaseous environment refreshed. A series of experiments is carried out on artificial voids, created from layered sections of polymer. One set of samples has a void inside the polymer with no access to the outer atmosphere; a second set of samples has a void with a closed end channel and a third set of samples has a vent connecting the void to the outer atmosphere. All three sample sets are stressed using the same electrical conditions for the same period of time. Measured differences in PD characteristics and PD induced degradation for the three different arrangements are presented.
{"title":"PD degradation analysis of PET with enclosed voids and voids connected to closed and vented channels","authors":"D. Adhikari, D. Hepburn, B. Stewart","doi":"10.1109/UPEC.2012.6398692","DOIUrl":"https://doi.org/10.1109/UPEC.2012.6398692","url":null,"abstract":"Polymeric insulating materials with excellent electrical properties are widely used in electrical power equipment. They are degraded however when they are subjected to partial discharges (PD). Factors which control the PD activity include pressure and type of gas present. The pressure variation in a self-contained void will differ from that in voids with channels; also a void with a channel connected to external atmosphere can have the gaseous environment refreshed. A series of experiments is carried out on artificial voids, created from layered sections of polymer. One set of samples has a void inside the polymer with no access to the outer atmosphere; a second set of samples has a void with a closed end channel and a third set of samples has a vent connecting the void to the outer atmosphere. All three sample sets are stressed using the same electrical conditions for the same period of time. Measured differences in PD characteristics and PD induced degradation for the three different arrangements are presented.","PeriodicalId":326950,"journal":{"name":"2012 47th International Universities Power Engineering Conference (UPEC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127482292","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 : 2012-12-31DOI: 10.1109/UPEC.2012.6398605
Chengxi Liu, Quan Xu, Zhe Chen, C. Bak
As the most wide-area industrial network, the power system can be modeled as a graph with edges and vertices, which represent the lines and buses of the power grid respectively. Further methodologies such as complex network theory may help in identifying the vulnerability of power grid, analyzing the contingency, preventing cascading blackouts and so on. When power system is integrated with distributed generation (DG), decentralized generation at distribution level replaces some of the centralized generation at transmission level. DG units are able to improve the reliability of the power system, shorten the electrical distance between the sources and loads, alleviate the long-distance large-capacity transmission, and increase the efficiency. This paper proposes several vulnerability indices, such as structural vulnerability index (SVI), contingency vulnerability index (CVI) and operational vulnerability index (OVI) to evaluate the impact of DG to power system vulnerability. The simulation in DIgSILENT/PowerFactory is conducted to assess the vulnerability of a 93-bus test power system, identify the vulnerable lines and buses, evaluate the improvement of the vulnerability index when the network is integrated with DG units, and may further to optimize the planning DG units in the future.
{"title":"Vulnerability evaluation of power system integrated with large-scale distributed generation based on complex network theory","authors":"Chengxi Liu, Quan Xu, Zhe Chen, C. Bak","doi":"10.1109/UPEC.2012.6398605","DOIUrl":"https://doi.org/10.1109/UPEC.2012.6398605","url":null,"abstract":"As the most wide-area industrial network, the power system can be modeled as a graph with edges and vertices, which represent the lines and buses of the power grid respectively. Further methodologies such as complex network theory may help in identifying the vulnerability of power grid, analyzing the contingency, preventing cascading blackouts and so on. When power system is integrated with distributed generation (DG), decentralized generation at distribution level replaces some of the centralized generation at transmission level. DG units are able to improve the reliability of the power system, shorten the electrical distance between the sources and loads, alleviate the long-distance large-capacity transmission, and increase the efficiency. This paper proposes several vulnerability indices, such as structural vulnerability index (SVI), contingency vulnerability index (CVI) and operational vulnerability index (OVI) to evaluate the impact of DG to power system vulnerability. The simulation in DIgSILENT/PowerFactory is conducted to assess the vulnerability of a 93-bus test power system, identify the vulnerable lines and buses, evaluate the improvement of the vulnerability index when the network is integrated with DG units, and may further to optimize the planning DG units in the future.","PeriodicalId":326950,"journal":{"name":"2012 47th International Universities Power Engineering Conference (UPEC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126402841","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 : 2012-12-31DOI: 10.1109/UPEC.2012.6398427
R. Porumb, N. Golovanov, C. Toader, P. Postolache
Current structure of the main electric distribution utility in Romania consists in three areas, which cover the center and north areas of Country. Starting from the analysis of small users and users on the distribution utility subsidiaries and ways of building load profiles used in other countries and presented in the literature, are proposed following categories representative of non-dispatched users. Theoretical development of the specific mathematical model based on collecting data measured at each user was generated. The study was performed for consumers which do not have implemented the proper metering devices within each distribution subsidiary and clustering them into categories. The identified clusters were pre-evaluated from variability of consumption, in order to ease the overall load pattern identification process.
{"title":"Electrical load pattern for LV consumers. A Romanian case","authors":"R. Porumb, N. Golovanov, C. Toader, P. Postolache","doi":"10.1109/UPEC.2012.6398427","DOIUrl":"https://doi.org/10.1109/UPEC.2012.6398427","url":null,"abstract":"Current structure of the main electric distribution utility in Romania consists in three areas, which cover the center and north areas of Country. Starting from the analysis of small users and users on the distribution utility subsidiaries and ways of building load profiles used in other countries and presented in the literature, are proposed following categories representative of non-dispatched users. Theoretical development of the specific mathematical model based on collecting data measured at each user was generated. The study was performed for consumers which do not have implemented the proper metering devices within each distribution subsidiary and clustering them into categories. The identified clusters were pre-evaluated from variability of consumption, in order to ease the overall load pattern identification process.","PeriodicalId":326950,"journal":{"name":"2012 47th International Universities Power Engineering Conference (UPEC)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126251431","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 : 2012-12-31DOI: 10.1109/UPEC.2012.6398632
S. Hosseini, S. K. Haghighian, S. Danyali, H. Aghazadeh
Hybrid Wind/PV systems are one efficient solution to supply power either directly to a utility grid or to an isolated load with other advantages include the long lifetime and low maintenance requirements. This paper proposes a hybrid energy system contains a multi-input converter (MIC) which combines (WT) and (PV) as renewable power sources of electrical energy. The proposed converter interfaces two unidirectional input power ports, a port for a storage element in a unified structure. The proposed structure utilizes only four power switches which are independently controlled with four different duty ratios. The system is responsible for provision of the power needed for lighting system under any circumstances to promotion of reliability of the lighting system. A new method of Maximum power point tracking strategy based on Newton-Raphson algorithm is presented for PMSG variable speed turbine generation system, which makes a high efficiency wind power system. Description of the proposed hybrid system along with detailed simulation results which verify its feasibility are given to demonstrate the availability of the proposed system by PSCAD/EMTDC software.
{"title":"Multi-input dc boost converter supplied by a hybrid PV/Wind turbine power systems for street lighting application connected to the grid","authors":"S. Hosseini, S. K. Haghighian, S. Danyali, H. Aghazadeh","doi":"10.1109/UPEC.2012.6398632","DOIUrl":"https://doi.org/10.1109/UPEC.2012.6398632","url":null,"abstract":"Hybrid Wind/PV systems are one efficient solution to supply power either directly to a utility grid or to an isolated load with other advantages include the long lifetime and low maintenance requirements. This paper proposes a hybrid energy system contains a multi-input converter (MIC) which combines (WT) and (PV) as renewable power sources of electrical energy. The proposed converter interfaces two unidirectional input power ports, a port for a storage element in a unified structure. The proposed structure utilizes only four power switches which are independently controlled with four different duty ratios. The system is responsible for provision of the power needed for lighting system under any circumstances to promotion of reliability of the lighting system. A new method of Maximum power point tracking strategy based on Newton-Raphson algorithm is presented for PMSG variable speed turbine generation system, which makes a high efficiency wind power system. Description of the proposed hybrid system along with detailed simulation results which verify its feasibility are given to demonstrate the availability of the proposed system by PSCAD/EMTDC software.","PeriodicalId":326950,"journal":{"name":"2012 47th International Universities Power Engineering Conference (UPEC)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122279960","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 : 2012-12-31DOI: 10.1109/UPEC.2012.6398418
Jingling Sun, K. Lo
The deregulation of electricity market has brought more challenges to the system operator to handle system contingencies. In the deregulated market, congestions are encountered with higher frequency than before. Congestion can lead to price volatility and system instability, which can deteriorate the electricity market operation. Therefore proper congestion management methods should be developed to meet the criterion of the new electricity trading mechanism. Most of published researches on congestion management were investigated without considering the demand elasticity of the load. A congestion management approach taking the demand elasticity into account is proposed in this paper. The Optimal Power Flow tool is used to determine the congestion relief action and the power transfer distribution factor matrix is introduced with the demand elasticity. A case study on IEEE 14-Bus system is presented to illustrate the application of the proposed method.
{"title":"A congestion management method with demand elasticity and PTDF approach","authors":"Jingling Sun, K. Lo","doi":"10.1109/UPEC.2012.6398418","DOIUrl":"https://doi.org/10.1109/UPEC.2012.6398418","url":null,"abstract":"The deregulation of electricity market has brought more challenges to the system operator to handle system contingencies. In the deregulated market, congestions are encountered with higher frequency than before. Congestion can lead to price volatility and system instability, which can deteriorate the electricity market operation. Therefore proper congestion management methods should be developed to meet the criterion of the new electricity trading mechanism. Most of published researches on congestion management were investigated without considering the demand elasticity of the load. A congestion management approach taking the demand elasticity into account is proposed in this paper. The Optimal Power Flow tool is used to determine the congestion relief action and the power transfer distribution factor matrix is introduced with the demand elasticity. A case study on IEEE 14-Bus system is presented to illustrate the application of the proposed method.","PeriodicalId":326950,"journal":{"name":"2012 47th International Universities Power Engineering Conference (UPEC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121308641","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 : 2012-12-31DOI: 10.1109/UPEC.2012.6398606
Petru Dan Cristian, C. Barbulescu, A. Simo, S. Kilyeni, F. Solomonesc
Load flow calculation is the first step in resolving the problem imposed by the optimal operation of complex power systems. This paper aims to elaborate an original mathematical model focused on using Particle Swarm Optimization (PSO) to provide the systems status in the steady state operation. It is also intended to analyze if the proposed method is feasible to replace the traditional Newton based methods so it can be later used to obtain the optimal power flow and for transmission expansion planning.
{"title":"Load flow computation Particle Swarm Optimization algorithm","authors":"Petru Dan Cristian, C. Barbulescu, A. Simo, S. Kilyeni, F. Solomonesc","doi":"10.1109/UPEC.2012.6398606","DOIUrl":"https://doi.org/10.1109/UPEC.2012.6398606","url":null,"abstract":"Load flow calculation is the first step in resolving the problem imposed by the optimal operation of complex power systems. This paper aims to elaborate an original mathematical model focused on using Particle Swarm Optimization (PSO) to provide the systems status in the steady state operation. It is also intended to analyze if the proposed method is feasible to replace the traditional Newton based methods so it can be later used to obtain the optimal power flow and for transmission expansion planning.","PeriodicalId":326950,"journal":{"name":"2012 47th International Universities Power Engineering Conference (UPEC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115034014","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 : 2012-12-31DOI: 10.1109/UPEC.2012.6398622
D. Sarafianos
Modular Multilevel Converter (MMC) is a promising technology for connecting to the grid distant offshore applications. This paper presents the considerations, the procedure and the challenges of the MMC's basic building block construction. The prototype is thoroughly tested and its results are discussed in this paper. The evaluation of the results is confirmed through the simulation of a single phase MMC.
{"title":"Modular Multilevel Converter cell construction","authors":"D. Sarafianos","doi":"10.1109/UPEC.2012.6398622","DOIUrl":"https://doi.org/10.1109/UPEC.2012.6398622","url":null,"abstract":"Modular Multilevel Converter (MMC) is a promising technology for connecting to the grid distant offshore applications. This paper presents the considerations, the procedure and the challenges of the MMC's basic building block construction. The prototype is thoroughly tested and its results are discussed in this paper. The evaluation of the results is confirmed through the simulation of a single phase MMC.","PeriodicalId":326950,"journal":{"name":"2012 47th International Universities Power Engineering Conference (UPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129686426","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 : 2012-12-31DOI: 10.1109/UPEC.2012.6398413
L. L. Pfitscher, D. Bernardon, L. Canha, V. Montagner, L. Comasseto, M. Ramos
The parallelism of distribution networks can be used to transfer loads between feeders without the need of disconnection of consumers during the maneuvers. In the context of the Smart Grids, the parallelism of feeders can be used in automatic reconfiguration of networks for the improvement of power quality and voltage levels, and reduction of energy losses. However, the maneuvers for parallelism must be preceded by studies to verify their technical and operational feasibility. This paper presents a study that discusses aspects of loading, protection, and voltage levels related to parallelism of networks, in transient and steady-state analysis. The validation of the developed methodology was carried out by comparison of simulation results with the ATP program. The study aims to be suitable for real-time application in reconfiguration of distribution networks. Integration with remote controlled switches, so that the network reconfiguration can be done automatically, is one of the differentials of the work. The tests here presented are made in a real model of a distribution network of a power utility. The developed algorithm has as main result a reliable indication of the technical feasibility of connecting feeders in parallel.
{"title":"Studies on parallelism of feeders for automatic reconfiguration of distribution networks","authors":"L. L. Pfitscher, D. Bernardon, L. Canha, V. Montagner, L. Comasseto, M. Ramos","doi":"10.1109/UPEC.2012.6398413","DOIUrl":"https://doi.org/10.1109/UPEC.2012.6398413","url":null,"abstract":"The parallelism of distribution networks can be used to transfer loads between feeders without the need of disconnection of consumers during the maneuvers. In the context of the Smart Grids, the parallelism of feeders can be used in automatic reconfiguration of networks for the improvement of power quality and voltage levels, and reduction of energy losses. However, the maneuvers for parallelism must be preceded by studies to verify their technical and operational feasibility. This paper presents a study that discusses aspects of loading, protection, and voltage levels related to parallelism of networks, in transient and steady-state analysis. The validation of the developed methodology was carried out by comparison of simulation results with the ATP program. The study aims to be suitable for real-time application in reconfiguration of distribution networks. Integration with remote controlled switches, so that the network reconfiguration can be done automatically, is one of the differentials of the work. The tests here presented are made in a real model of a distribution network of a power utility. The developed algorithm has as main result a reliable indication of the technical feasibility of connecting feeders in parallel.","PeriodicalId":326950,"journal":{"name":"2012 47th International Universities Power Engineering Conference (UPEC)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129858119","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 : 2012-12-31DOI: 10.1109/UPEC.2012.6398543
J. Jaturacherdchaiskul, S. Thongkeaw
This paper present overview of wind energy in electric power systems continues to increase global. Certain natural characteristics of wind present challenges to power system planners and operators. Wind plants operate when the wind blows, with power levels varying with the strength of the wind. Because of these characteristics, wind plants are not dispatchable in the traditional sense. Then describe how wind integration studies are conducted, and grid impacts from these grid integration studies, and assess some of the grid planning and operation changes that may be necessary to incorporate higher levels of wind generation.
{"title":"Planning and operation for power system with wind power generators: A review","authors":"J. Jaturacherdchaiskul, S. Thongkeaw","doi":"10.1109/UPEC.2012.6398543","DOIUrl":"https://doi.org/10.1109/UPEC.2012.6398543","url":null,"abstract":"This paper present overview of wind energy in electric power systems continues to increase global. Certain natural characteristics of wind present challenges to power system planners and operators. Wind plants operate when the wind blows, with power levels varying with the strength of the wind. Because of these characteristics, wind plants are not dispatchable in the traditional sense. Then describe how wind integration studies are conducted, and grid impacts from these grid integration studies, and assess some of the grid planning and operation changes that may be necessary to incorporate higher levels of wind generation.","PeriodicalId":326950,"journal":{"name":"2012 47th International Universities Power Engineering Conference (UPEC)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128877260","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 : 2012-12-31DOI: 10.1109/UPEC.2012.6398449
R. Gopakumar, B. Asare-Bediako, H. Slootweg, P. Ribeiro, A. Haytema
PowerRouter is an enabling technology from Nedap for storing and exchanging renewable energy. It has power management functionalities which routes generated and/or stored energy to different location based on customers' set priorities. PowerRouter currently focuses on the needs of the household consumers and it is ready to take the next step by offering ancillary services to energy suppliers and system operators according to their requirements. In this paper, the envisioned smart grid employing PowerRouter is described. The objectives of the smart grid and its benefits to the various stakeholders are defined followed by the design of smart grid architecture employing the PowerRouter. The communication infrastructure and the data transactions are also explained. A roadmap was also defined to realize the objectives of the smart grid.
{"title":"Realization of smart grid employing powerrouter","authors":"R. Gopakumar, B. Asare-Bediako, H. Slootweg, P. Ribeiro, A. Haytema","doi":"10.1109/UPEC.2012.6398449","DOIUrl":"https://doi.org/10.1109/UPEC.2012.6398449","url":null,"abstract":"PowerRouter is an enabling technology from Nedap for storing and exchanging renewable energy. It has power management functionalities which routes generated and/or stored energy to different location based on customers' set priorities. PowerRouter currently focuses on the needs of the household consumers and it is ready to take the next step by offering ancillary services to energy suppliers and system operators according to their requirements. In this paper, the envisioned smart grid employing PowerRouter is described. The objectives of the smart grid and its benefits to the various stakeholders are defined followed by the design of smart grid architecture employing the PowerRouter. The communication infrastructure and the data transactions are also explained. A roadmap was also defined to realize the objectives of the smart grid.","PeriodicalId":326950,"journal":{"name":"2012 47th International Universities Power Engineering Conference (UPEC)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133707396","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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