PES T&D 2012最新文献

{"title":"Control for grid connected PMSG Wind turbine with DC link capacitance reduction","authors":"D. F. Ortega, W. Shireen, F. Castelli-Dezza","doi":"10.1109/TDC.2012.6281425","DOIUrl":"https://doi.org/10.1109/TDC.2012.6281425","url":null,"abstract":"An enhanced control is presented that effectively cancels the noise in torque, and currents in a wind turbine Permanent Magnet Synchronous Generator. The proposed control also allows the reduction of the DC-Link capacitance. Simulations succeed on Three Phase and Single Phase grid connection, through a Back to Back converter. The grid side converter switching function was modified with an algorithm that represents the noise from grid frequency. The DC Link ripple due to capacitor reduction was canceled, and as a consequence there were no noise frequencies on electromagnetic torque, stator and grid currents after the algorithm was implemented. Remarkable reduction in DC Link capacitor was possible, making the system more reliable and economical. The PMSG is protected from core saturation, because stator currents consist of only the fundamental frequency component. This results in a constant torque, preventing mechanical stress.","PeriodicalId":19873,"journal":{"name":"PES T&D 2012","volume":"19 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2012-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84018138","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}

{"title":"Negotiation agent with adaptive attitude bidding strategy for facilitating energy exchanges between smart building and utility grid","authors":"Zhu Wang, Lingfeng Wang","doi":"10.1109/TDC.2012.6281688","DOIUrl":"https://doi.org/10.1109/TDC.2012.6281688","url":null,"abstract":"Smart and green buildings have attracted much attention in the recent years. Development of an effective negotiation model for facilitating the bi-directional energy exchange between the utility grid and the building is important for enhancing the building intelligence. In this paper, a negotiation agent with adaptive attitude bidding strategy is designed and analyzed. To develop such an adaptive attitude negotiation model, a comprehensive set of factors in the integrated building and utility grid system should be taken into account. The developed negotiation agent turns out to be able to dynamically adjust its behavior in response to varying attitudes in the negotiation process. Case studies and simulation results are presented and analyzed in the paper.","PeriodicalId":19873,"journal":{"name":"PES T&D 2012","volume":"15 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2012-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90530177","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}

{"title":"Effects of uncertainties in shaft mechanical parameters on maximum torsional torques in meshed networks with HVDC lines","authors":"A. Adrees, J. Milanović","doi":"10.1109/TDC.2012.6281542","DOIUrl":"https://doi.org/10.1109/TDC.2012.6281542","url":null,"abstract":"The paper presents analysis of the torsional torques of a turbine generator rotor system in a meshed AC network with monopolar HVDC link following symmetrical and asymmetrical faults. The emphasis of the work is on establishing the influence of uncertainties in the mechanical parameters of turbine-generator shaft system on maximum torsional torques. Three loading conditions of turbine generator are considered and different types of faults are simulated for each loading condition. A full multi stage turbine model, a four machine meshed AC network and a classical, Line Current Commutated, HVDC system model are developed in DIgSILENT Power Factory environment. Uncertainties in mechanical parameters of turbine-generator shafts are modeled using probability density functions to assess more realistically their effects on maximum torsional torques.","PeriodicalId":19873,"journal":{"name":"PES T&D 2012","volume":"24 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2012-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79288577","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}

{"title":"Substation surveillance using RFI and complementary EMI detection techniques","authors":"A. Nesbitt, B. Stewart, S. McMeekin, K. Liebech-Lien, H. Kristiansen","doi":"10.1109/TDC.2012.6281616","DOIUrl":"https://doi.org/10.1109/TDC.2012.6281616","url":null,"abstract":"The successful implementation of a substation asset management strategy depends heavily on predictive maintenance assessments with surveillance based techniques used to identify potential sites of degradation followed by more investigative and invasive quantitative techniques. The deployment of radio frequency interference (RFI) measurement can provide an efficient non-invasive surveillance technique to detect and locate partial discharges (PD) to individual high-voltage (HV) apparatus. This paper demonstrates the benefits of combining the assessment of RFI emissions with targeted deployment of other complementary non-invasive electromagnetic interference (EMI) detection techniques. This provides an increased level of confidence in the location, identification and assessment of severity of degradation and is of particular importance with complex HV apparatus such as transformers where the propagation paths for RFI are less well defined. Frequency sweep data and time-resolved traces acquired from substation surveillance scenarios are presented and compared with follow up assessments using complementary EMI couplers such as high frequency CTs (HFCT) and transient earth voltage (TEV) couplers. Key parameters that characterise RFI emissions in the frequency domain and in the time domain (e.g. RFI intensity and bandwidth, repetition rate) that provide a measure of severity of degradation and a means to classify or fingerprint suspect fault mechanisms, are correlated with those derived from measurements using other complementary PD detection techniques. The RFI surveillance technique followed by the deployment of complementary PD detection techniques is proven to be effective with a wide range of HV equipment to confidently characterise and trace electrical deterioration with a high degree of confidence.","PeriodicalId":19873,"journal":{"name":"PES T&D 2012","volume":"44 1","pages":"1-20"},"PeriodicalIF":0.0,"publicationDate":"2012-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84894969","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}

{"title":"Conservation Voltage Reduction with feedback from Advanced Metering Infrastructure","authors":"M. A. Peskin, P. W. Powell, E. J. Hall","doi":"10.1109/TDC.2012.6281644","DOIUrl":"https://doi.org/10.1109/TDC.2012.6281644","url":null,"abstract":"Dominion Virginia Power's Conservation Voltage Reduction program has demonstrated energy savings of up to 4% by optimizing off-peak voltage. The key innovation is incorporating end-of-line voltage data from every customer meter, which eliminates the need to maintain an electrical model of the feeder. CVR is accomplished via DMS control of the load tap changer based on voltage feedback from AMI meter data. Analysis of AMI voltage data determines a subset of meters representing the lowest customer voltages; these meters are read every 15 minutes and used to determine the optimal feeder voltage. A statistical evaluation of pilot feeders shows a CVR factor of 0.92% reduction in energy for each 1% reduction in voltage. In addition, customer voltage monitoring identifies operational issues prior to customer calls. The program is projected to save an average of 2.8% of annual energy when applied system-wide, and may be expanded to accomplish on-peak demand reduction.","PeriodicalId":19873,"journal":{"name":"PES T&D 2012","volume":"130 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2012-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85345839","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}

{"title":"Coordinated control of a solar and battery system in a microgrid","authors":"Ling Xu, Zhixin Miao, Lingling Fan","doi":"10.1109/TDC.2012.6281700","DOIUrl":"https://doi.org/10.1109/TDC.2012.6281700","url":null,"abstract":"This paper investigates the control strategies of a Li-Ion battery group with a PV array within a microgrid. In the grid-connected mode, the battery and the PV array operate at power control mode, while in the autonomous mode the battery provides voltage and frequency control instead. This paper presents a detailed model of battery including state of charge (SOC) modeling, analysis of short-time and long-time transient characteristics, and analysis of a detailed PV array model. This paper also presents effective control strategies for a battery with the PV array system to operate at both the grid-connected and the autonomous modes. The paper presents results from a test microgrid consisting of a voltage source converter (VSC) interfaced battery, a PV array, passive loads and an induction machine which is built using power systems simulation software. The paper presents results from simulations that demonstrate the proposed control strategies, which could assist in the coordination of independent distributed generation.","PeriodicalId":19873,"journal":{"name":"PES T&D 2012","volume":"51 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87233053","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}

{"title":"Development of novel distribution automation system (DAS) on customer side distribution system","authors":"M. Ahmed, W. L. Soo","doi":"10.1109/TDC.2012.6281713","DOIUrl":"https://doi.org/10.1109/TDC.2012.6281713","url":null,"abstract":"This research work has been done in designing and developing a Novel Distribution Automation System (DAS) in an open loop customer side distribution system. The research has utilized an automation techniques in both hardware and software environment using a communication network and embedded controllers along with power meters which has utilized the possible best solution for the fault operation and control tasks remotely. All hardware and software components have been developed and integrated together. Data exchange mechanism has been developed between the host computer and the embedded controllers that function in two way data exchanges between the two. The remote hardware controllers such as remoter terminal units (RTUs) are enabled to the communication modules to operate the substation remotely. The metering equipment is used as real time data restoration tool and gathers the customer's consumption energy information. Thus a multipurpose power meter is used as hand of the electrical utility at the customer side. IsaGraf provides communication - GSM (Global system for Mobile Communications) function blocks such as SMS (Short Message Service) operating functions “SMS_send”, “SMS_test”, “SMS_gets” and developed SMS usage functions. These are functions are created for GSM based messaging system to communicate with the person in charge to operate the system at anytime and anywhere remotely. Fabrication testing has been done on real distribution system and the results are shown in this paper.","PeriodicalId":19873,"journal":{"name":"PES T&D 2012","volume":"58 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75308917","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}

{"title":"An innovative approach to smart automation testing at National Grid","authors":"Ja Knauss, C. Warren, D. Kearns","doi":"10.1109/TDC.2012.6281507","DOIUrl":"https://doi.org/10.1109/TDC.2012.6281507","url":null,"abstract":"Upon completion of a successful Distribution Automation (DA) Pilot Project centered in National Grid's upstate New York service territory, it was determined that the reliability improvements delivered by the pilot demonstration justified a much more comprehensive effort to further evaluate additional Smart Grid technologies. The vision was to conduct experiments with a full suite of Smart Grid technologies including: AMI; Home Area Network and energy management systems; Automatic Fault Isolation & System Restoration; advanced feeder monitoring; distribution transformer monitoring; single pole tripping and Pulse Closing technology on distribution line reclosers; advanced capacitor control with independent pole operation; faulted circuit indicators with 2-way communication capability; and distribution fault locating capability. This vision came to be known as National Grid's Smart Grid Pilot proposal. Many challenges exist with such a comprehensive approach from public and personnel safety, to ensuring interoperability between devices and systems of different manufacture. In order to determine which technologies would provide the most benefit to National Grid's customer base, a means was needed to prequalify the various types of products available before large scale deployments were initiated. Looking at the large number of Smart Grid device suppliers, architectures and products available, we realized that the optimum solution would be to build a facility wherein a wide range of Smart Grid technologies could be installed and systematically put through their paces; i.e. actually tested in as near a real-world atmosphere as practical. Thus was born the National Grid “Smart Technology Centre” or STC. Soon thereafter, National Grid's Utility of the Future engineering team designed, engineered, and constructed a truly innovative test fixture that enabled system level testing on complex distribution networks to ensure process safety during field deployment. One of only a few known organizations in the U.S., National Grid has in-house capability to truly test and evaluate an end-to-end Smart distribution system architecture where systems such as automated fault isolation and system restoration can be evaluated. This paper will discuss interoperability testing that National Grid embarked upon to prepare for its proposed Smart Grid Pilot demonstration and will detail the lengths that were taken in creating a test site where medium voltage Smart Grid technologies could be fully evaluated to ensure that the various applications would play well with each other prior to actually being deployed in the field. Furthermore, this paper will focus on providing an overview of the system level testing and technical evaluation of distribution protection and control equipment with automated fault isolation and system restoration capabilities. It will also detail a number of lessons learned from this effort and discuss future plans for smart technology evaluation as a bas","PeriodicalId":19873,"journal":{"name":"PES T&D 2012","volume":"7 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2012-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72705769","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}

{"title":"Application of self-healing technologies on power distribution systems: PHI's automatic sectionalizing & restoration systems","authors":"Joseph M. LoPorto","doi":"10.1109/TDC.2012.6281566","DOIUrl":"https://doi.org/10.1109/TDC.2012.6281566","url":null,"abstract":"With a boost by DOE SGIG grants1, Pepco Holdings, Inc (PHI) is embarking on an ambition plan to expand its Automatic Sectionalizing and Restoration Systems (ASR). More than 130 feeders will be made ASR capable by the end of 2013. PHI's ASR system is made up of substation automation equipment, inclusive of an ASR control program, automatic feeder sectionalizing devices and an end-to-end communication system. These technologies will allow “self-healing” by automatically isolating faulted feeder segments, and restoring service to customers on the same feeder not impacted by the fault by closing feeder ties with adjacent feeders. Based on results of a pilot ASR installation on four feeders, it is estimated that these systems can improve the feeder's reliability performance indices by more than 50%. We will discuss PHI's Smart Grid Vision, the applied technologies, lessons learned from the pilot project, and demonstrate the operation of an ASR system.","PeriodicalId":19873,"journal":{"name":"PES T&D 2012","volume":"20 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91302056","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}

{"title":"Practical modeling of Smart Grid SMS™ storage management system in a microgrid","authors":"S. Bahramirad, E. Camm","doi":"10.1109/TDC.2012.6281697","DOIUrl":"https://doi.org/10.1109/TDC.2012.6281697","url":null,"abstract":"Developing practical models for microgrid components is the first and most essential step in modeling a microgrid. In this paper a practical model for one of the most imperative components of the microgrid, a storage system, is proposed. To model the practical operation of the storage system, typical charge and discharge profiles proposed by the manufacturers are considered. Unit commitment (UC) in a microgrid is formulated and used to ensure the optimal operation of the microgrid while incorporating the storage system. Mixed integer programming (MIP) is used to formulate the UC problem and model the storage system. The practicality of the model, as well as the economic benefits obtained through using a storage system in the microgrid is examined using a six-bus system.","PeriodicalId":19873,"journal":{"name":"PES T&D 2012","volume":"14 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90910535","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}