Pub Date : 2014-10-23DOI: 10.1109/UPEC.2014.6934653
Xiaoyu Wang, S. Strachan, J. Kirkwood, S. Mcarthur
Historically restoration switching strategies have been deployed to improve the system reliability by addressing effects resulting from permanent fault activity via distribution automation schemes. This paper investigates the potential role of a Distribution Automation System (DAS) in dealing with nuisance tripping where customers are often disturbed by frequently occurring short-term supply outages affecting their quality of supply. In order to mitigate these nuisance supply interruptions, this paper will focus on the development of an integrated decision support system that utilises available Supervisory Control And Data Acquisition (SCADA) alarm data and distribution network data available from pole mounted auto-reclosers (provided by a distribution network operator) to detect and diagnose pre-permanent fault activity responsible for nuisance tripping. The developed system will detect the advent of nuisance tripping on a circuit, and subsequently conduct prognostic health checks to determine the cause of the underlying circuit fault activity, responsible for the nuisance tripping, which often leads to more serious permanent faults in the future. Previous fault activity could be used to identify fault signature data patterns and trends through data mining techniques that predict potential nuisance tripping associated with network behaviour, transient activity and permanent network faults. The distribution automation scheme may be subsequently operated to mitigate the risk of nuisance tripping and so improve the level of customer service associated with network operators. This system is capable of providing `early warning' of evolving faults which in turn allows an intervention to take place to inform and assist maintenance staff to take appropriate preventative action to minimise negative effect prior to it occurring.
{"title":"Automatic analysis of pole mounted auto-recloser data for fault prognosis to mitigate customer supply interruptions","authors":"Xiaoyu Wang, S. Strachan, J. Kirkwood, S. Mcarthur","doi":"10.1109/UPEC.2014.6934653","DOIUrl":"https://doi.org/10.1109/UPEC.2014.6934653","url":null,"abstract":"Historically restoration switching strategies have been deployed to improve the system reliability by addressing effects resulting from permanent fault activity via distribution automation schemes. This paper investigates the potential role of a Distribution Automation System (DAS) in dealing with nuisance tripping where customers are often disturbed by frequently occurring short-term supply outages affecting their quality of supply. In order to mitigate these nuisance supply interruptions, this paper will focus on the development of an integrated decision support system that utilises available Supervisory Control And Data Acquisition (SCADA) alarm data and distribution network data available from pole mounted auto-reclosers (provided by a distribution network operator) to detect and diagnose pre-permanent fault activity responsible for nuisance tripping. The developed system will detect the advent of nuisance tripping on a circuit, and subsequently conduct prognostic health checks to determine the cause of the underlying circuit fault activity, responsible for the nuisance tripping, which often leads to more serious permanent faults in the future. Previous fault activity could be used to identify fault signature data patterns and trends through data mining techniques that predict potential nuisance tripping associated with network behaviour, transient activity and permanent network faults. The distribution automation scheme may be subsequently operated to mitigate the risk of nuisance tripping and so improve the level of customer service associated with network operators. This system is capable of providing `early warning' of evolving faults which in turn allows an intervention to take place to inform and assist maintenance staff to take appropriate preventative action to minimise negative effect prior to it occurring.","PeriodicalId":414838,"journal":{"name":"2014 49th International Universities Power Engineering Conference (UPEC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121278973","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 : 2014-10-23DOI: 10.1109/UPEC.2014.6934813
Sacerdotianu Dumitru, Hurezeanu Iulian, Purcaru Ion
The reliability of transformer units and extending their life depend greatly on the degree of monitoring of their functional parameters with a view to determining the proper predictive maintenance measures, according to their interpretation. The achievements presented in this paper are the result of continuous upgrading which consisted in: increasing calculation accuracy, replacing the fixed point calculation by calculation in floating point, increasing calculation accuracy by replacing 10-byte CAN with 16-byte CAN, increasing the speed of acquisition-calculation by allocating the acquisition and calculation functions, increasing the sampling rate, increasing the speed and security of data transmission from the local monitoring system to the central processing unit by introducing the fiber optic support, increasing the data storage space on flash memory units and providing the possibility of monitoring system software configuration, depending on the monitored parameters and the reference specific elements of the application. The paper presents a compact embedded and local version with fiber optic support implementation within the circuits for processing the information in the field corresponding to the local monitoring equipment of transformer units. The presented version is of integrated equipment implemented for a power transformer monitoring system. The central unit is a single casting structure adapted for easy fastening on electric panels, overall dimensions approx. 280mm × 230mm × 100mm.
{"title":"Compact local system designed for power transformer monitoring — Type MONITRA control process","authors":"Sacerdotianu Dumitru, Hurezeanu Iulian, Purcaru Ion","doi":"10.1109/UPEC.2014.6934813","DOIUrl":"https://doi.org/10.1109/UPEC.2014.6934813","url":null,"abstract":"The reliability of transformer units and extending their life depend greatly on the degree of monitoring of their functional parameters with a view to determining the proper predictive maintenance measures, according to their interpretation. The achievements presented in this paper are the result of continuous upgrading which consisted in: increasing calculation accuracy, replacing the fixed point calculation by calculation in floating point, increasing calculation accuracy by replacing 10-byte CAN with 16-byte CAN, increasing the speed of acquisition-calculation by allocating the acquisition and calculation functions, increasing the sampling rate, increasing the speed and security of data transmission from the local monitoring system to the central processing unit by introducing the fiber optic support, increasing the data storage space on flash memory units and providing the possibility of monitoring system software configuration, depending on the monitored parameters and the reference specific elements of the application. The paper presents a compact embedded and local version with fiber optic support implementation within the circuits for processing the information in the field corresponding to the local monitoring equipment of transformer units. The presented version is of integrated equipment implemented for a power transformer monitoring system. The central unit is a single casting structure adapted for easy fastening on electric panels, overall dimensions approx. 280mm × 230mm × 100mm.","PeriodicalId":414838,"journal":{"name":"2014 49th International Universities Power Engineering Conference (UPEC)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116078755","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 : 2014-10-23DOI: 10.1109/UPEC.2014.6934645
S. Rind, Yaxing Ren, Lin Jiang
The aim of this paper is to investigate the performance of speed sensorless indirect vector control of IM traction drive and tracking accuracy of speed estimator employed on different driving profiles of EVs such as accelerating, constant speed and decelerating mode etc. Dynamic model of EV and IM are presented first in order to understand the required tractive force for the propulsion and behavior of the motor for transient analysis respectively. Rotor flux based Model Reference Adaptive System (MRAS) speed estimator is designed and implemented on sensorless indirect vector controlled traction drive. Simulation results show the satisfactory performance of speed regulation with the proposed speed sensorless control under different driving profiles. Rotor flux based MRAS speed estimator is implemented in indirect vector control of IM to get the effective and reliable solution for the speed estimation in sensorless traction drive.
{"title":"MRAS based speed sensorless indirect vector control of induction motor drive for electric vehicles","authors":"S. Rind, Yaxing Ren, Lin Jiang","doi":"10.1109/UPEC.2014.6934645","DOIUrl":"https://doi.org/10.1109/UPEC.2014.6934645","url":null,"abstract":"The aim of this paper is to investigate the performance of speed sensorless indirect vector control of IM traction drive and tracking accuracy of speed estimator employed on different driving profiles of EVs such as accelerating, constant speed and decelerating mode etc. Dynamic model of EV and IM are presented first in order to understand the required tractive force for the propulsion and behavior of the motor for transient analysis respectively. Rotor flux based Model Reference Adaptive System (MRAS) speed estimator is designed and implemented on sensorless indirect vector controlled traction drive. Simulation results show the satisfactory performance of speed regulation with the proposed speed sensorless control under different driving profiles. Rotor flux based MRAS speed estimator is implemented in indirect vector control of IM to get the effective and reliable solution for the speed estimation in sensorless traction drive.","PeriodicalId":414838,"journal":{"name":"2014 49th International Universities Power Engineering Conference (UPEC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116989040","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 : 2014-10-23DOI: 10.1109/UPEC.2014.6934627
Christine F. Martindale, R. Verrinder, C. Gaunt
This paper discusses a metering concept design based on equipment cheaper and smaller than a laptop and able to meet the requirements of power measurements that need relatively high frequency, simultaneous sampling. Its size and cost make it useful when developing hardware for smart grid systems. Non-active power is a term used to describe both distortion and reactive power. In conventional power theory, the apparent power, S, and non-active power, Q, are based on RMS measurements of voltages and line currents. A novel general power theory was proposed recently to give a measure of the true efficiency of power delivery under conditions of distortion, unbalance and direct current components, and the approach requires the simultaneous sampling of all voltages and currents at relatively high frequency. A metering device was designed for the measurement of instantaneous, simultaneously sampled voltages and currents in a three-phase system. The system has an upper sampling frequency limit of 2 000 Hz. The prototype design was fast enough to perform the general power theory calculations and log the data accurately. The project provides direction for the further development of this type of device for measuring non-active power, power quality and power electronic control.
{"title":"Proof of concept data logger for non-active power measurement","authors":"Christine F. Martindale, R. Verrinder, C. Gaunt","doi":"10.1109/UPEC.2014.6934627","DOIUrl":"https://doi.org/10.1109/UPEC.2014.6934627","url":null,"abstract":"This paper discusses a metering concept design based on equipment cheaper and smaller than a laptop and able to meet the requirements of power measurements that need relatively high frequency, simultaneous sampling. Its size and cost make it useful when developing hardware for smart grid systems. Non-active power is a term used to describe both distortion and reactive power. In conventional power theory, the apparent power, S, and non-active power, Q, are based on RMS measurements of voltages and line currents. A novel general power theory was proposed recently to give a measure of the true efficiency of power delivery under conditions of distortion, unbalance and direct current components, and the approach requires the simultaneous sampling of all voltages and currents at relatively high frequency. A metering device was designed for the measurement of instantaneous, simultaneously sampled voltages and currents in a three-phase system. The system has an upper sampling frequency limit of 2 000 Hz. The prototype design was fast enough to perform the general power theory calculations and log the data accurately. The project provides direction for the further development of this type of device for measuring non-active power, power quality and power electronic control.","PeriodicalId":414838,"journal":{"name":"2014 49th International Universities Power Engineering Conference (UPEC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116704313","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 : 2014-10-23DOI: 10.1109/UPEC.2014.6934802
Tianqi Zhang, Chuanyue Li, Jun Liang
This paper achieves flexible power flow control by inserting a DC voltage to a line of MTDC transmission. A thyristor based power flow control device is designed to generate this inserted DC voltage. Three-phase six-pulse rectifier using thyristor can convert an AC voltage from AC generator or AC grid to a DC voltage. Power exchange occurs between the AC voltage terminal and DC grids without causing extra power losses which would be found if an inserted resistance is used. A control system is designed for the device and for the power flow control. This design is simulated by using PSCAD/MTDC and evaluated under different operation conditions. The control system is evaluated. Power flow control method is evaluated. This simulation proves the capability of the device to control the power flow effectively.
{"title":"A thyristor based series power flow control device for multi-terminal HVDC transmission","authors":"Tianqi Zhang, Chuanyue Li, Jun Liang","doi":"10.1109/UPEC.2014.6934802","DOIUrl":"https://doi.org/10.1109/UPEC.2014.6934802","url":null,"abstract":"This paper achieves flexible power flow control by inserting a DC voltage to a line of MTDC transmission. A thyristor based power flow control device is designed to generate this inserted DC voltage. Three-phase six-pulse rectifier using thyristor can convert an AC voltage from AC generator or AC grid to a DC voltage. Power exchange occurs between the AC voltage terminal and DC grids without causing extra power losses which would be found if an inserted resistance is used. A control system is designed for the device and for the power flow control. This design is simulated by using PSCAD/MTDC and evaluated under different operation conditions. The control system is evaluated. Power flow control method is evaluated. This simulation proves the capability of the device to control the power flow effectively.","PeriodicalId":414838,"journal":{"name":"2014 49th International Universities Power Engineering Conference (UPEC)","volume":"646 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123288252","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 : 2014-10-23DOI: 10.1109/UPEC.2014.6934764
N. K. Neto, I. C. Figueiró, A. Abaide, D. Bernardon, L. Canha, A. S. Silveira, R. Pressi
The power system is changing. Classic methodologies applied for planning the distribution system should be adapted in an environment of Smart Grids. In this sense, an accurate forecast of energy demand will be essential to the utilities in this new grid model, being prepared for insertion of electric vehicles (EV), distributed generation (DG) and strategies on the demand side management (DSM). Therefore, this paper aims to evaluate and discuss the main challenges that energy companies in the Brazilian electric sector will face in the coming years. The impact of new variables in load forecast are presented as well as forecasting methodologies that have been studied and applied, aiming to identify establish guidelines to the utilities in their future studies of load forecast and system planning.
{"title":"Smart grid and the prospects of electricity demand forecast in Brazilian distribution system","authors":"N. K. Neto, I. C. Figueiró, A. Abaide, D. Bernardon, L. Canha, A. S. Silveira, R. Pressi","doi":"10.1109/UPEC.2014.6934764","DOIUrl":"https://doi.org/10.1109/UPEC.2014.6934764","url":null,"abstract":"The power system is changing. Classic methodologies applied for planning the distribution system should be adapted in an environment of Smart Grids. In this sense, an accurate forecast of energy demand will be essential to the utilities in this new grid model, being prepared for insertion of electric vehicles (EV), distributed generation (DG) and strategies on the demand side management (DSM). Therefore, this paper aims to evaluate and discuss the main challenges that energy companies in the Brazilian electric sector will face in the coming years. The impact of new variables in load forecast are presented as well as forecasting methodologies that have been studied and applied, aiming to identify establish guidelines to the utilities in their future studies of load forecast and system planning.","PeriodicalId":414838,"journal":{"name":"2014 49th International Universities Power Engineering Conference (UPEC)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125124237","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 : 2014-10-23DOI: 10.1109/UPEC.2014.6934588
D. Bernardon, L. Canha, A. Abaide, V. Garcia, M. Sperandio, G. S. Lopes
In contingency situation, the ability to self-healing plays an important role on reducing the time to restore the energy supply. The increasing use of remote controlled equipment in power systems leads the development of more efficient techniques for automatic restoration of power supply, being particularly important in Smart Grid applications. This paper presents a methodology and system for automatic restoration of power supply in distribution network. The optimization of the network performance is based on a heuristic method and multicriterial analysis. The developed algorithms are integrated into a supervisory system, which allows real-time measurements and commands to the equipment. The proposed methodology is tested in a real network of a power utility and results are presented and discussed.
{"title":"Smart grid concepts applied to self-healing in distribution system","authors":"D. Bernardon, L. Canha, A. Abaide, V. Garcia, M. Sperandio, G. S. Lopes","doi":"10.1109/UPEC.2014.6934588","DOIUrl":"https://doi.org/10.1109/UPEC.2014.6934588","url":null,"abstract":"In contingency situation, the ability to self-healing plays an important role on reducing the time to restore the energy supply. The increasing use of remote controlled equipment in power systems leads the development of more efficient techniques for automatic restoration of power supply, being particularly important in Smart Grid applications. This paper presents a methodology and system for automatic restoration of power supply in distribution network. The optimization of the network performance is based on a heuristic method and multicriterial analysis. The developed algorithms are integrated into a supervisory system, which allows real-time measurements and commands to the equipment. The proposed methodology is tested in a real network of a power utility and results are presented and discussed.","PeriodicalId":414838,"journal":{"name":"2014 49th International Universities Power Engineering Conference (UPEC)","volume":"70 3-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120918012","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 : 2014-10-23DOI: 10.1109/UPEC.2014.6934747
S. I. Vagropoulos, Alexandros Kleidaras, A. Bakirtzis
This paper assesses the financial viability of an investment on Electric Vehicle Charging Stations (EVCSs) from a commercial/industrial workplace with a parking lot, which acts as a reseller that purchases energy from the grid and then sells energy to the Electric Vehicle (EV) owners at a new flat rate tariff. Investment cost drivers (expected EVCSs costs, anticipated EV charging needs, EVCSs operational life etc.) are specified by associated market researches. Two typical capital budgeting methods applied to discounted cash flows, the internal rate of return (IRR) and the net present value (NPV) method, are used to measure the investment's profitability. Level II charging installations (3.3 kW and 7.2 kW) are examined and the case focuses on a Greek facility thus, retail-tariffs contracts of the biggest Greek electricity retailer and EV penetration scenarios for Greece are considered. Results about the investment profitability are derived, followed by remarks on strategies that can increase facility's profit. As the EVSCs market is still immature, a sensitivity analysis for various parameters is carried out to better support the economic results. The key profit determinants are identified.
{"title":"Financial viability of investments on electric vehicle charging stations in workplaces with parking lots under flat rate retail tariff schemes","authors":"S. I. Vagropoulos, Alexandros Kleidaras, A. Bakirtzis","doi":"10.1109/UPEC.2014.6934747","DOIUrl":"https://doi.org/10.1109/UPEC.2014.6934747","url":null,"abstract":"This paper assesses the financial viability of an investment on Electric Vehicle Charging Stations (EVCSs) from a commercial/industrial workplace with a parking lot, which acts as a reseller that purchases energy from the grid and then sells energy to the Electric Vehicle (EV) owners at a new flat rate tariff. Investment cost drivers (expected EVCSs costs, anticipated EV charging needs, EVCSs operational life etc.) are specified by associated market researches. Two typical capital budgeting methods applied to discounted cash flows, the internal rate of return (IRR) and the net present value (NPV) method, are used to measure the investment's profitability. Level II charging installations (3.3 kW and 7.2 kW) are examined and the case focuses on a Greek facility thus, retail-tariffs contracts of the biggest Greek electricity retailer and EV penetration scenarios for Greece are considered. Results about the investment profitability are derived, followed by remarks on strategies that can increase facility's profit. As the EVSCs market is still immature, a sensitivity analysis for various parameters is carried out to better support the economic results. The key profit determinants are identified.","PeriodicalId":414838,"journal":{"name":"2014 49th International Universities Power Engineering Conference (UPEC)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123913541","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 : 2014-10-23DOI: 10.1109/UPEC.2014.6934762
F. Amadei, A. Cerretti, M. Coppo, P. Mattavelli, R. Sgarbossa, R. Turri
In the last twenty years the Distributed Generation (DG) increased till a high level that introduced several issues to the classical management system of distribution networks. In many countries different technical rules have been introduced in order to integrate the DG units in the medium voltage (MV) and low voltage (LV) distribution network. New standards state requirements for all generators, included inverter based ones, imposing a Fault Ride Through (FRT) philosophy and new active and reactive power regulation actions with the aim of maintaining the transmission system stability at the level it was with traditional rotating generators, or even increasing it. These technical rules may not be fully compliant with the automatic reclosing cycle usually performed from the CB at the beginning of MV feeders and/or with the automatic selection procedure of faulty section selection and supply restore to healthy ones. In this paper the effects of DG units connected at MV and LV voltage level in relation to different fault conditions are analysed. The possibility of temporary uncontrolled islanded operations are investigated in order to evaluate the role of new Standards or Regulatory or Law requirements in the automatic reclosing procedure and MV network automation.
{"title":"Temporary islanding operations of MV/LV active distribution networks under fault conditions","authors":"F. Amadei, A. Cerretti, M. Coppo, P. Mattavelli, R. Sgarbossa, R. Turri","doi":"10.1109/UPEC.2014.6934762","DOIUrl":"https://doi.org/10.1109/UPEC.2014.6934762","url":null,"abstract":"In the last twenty years the Distributed Generation (DG) increased till a high level that introduced several issues to the classical management system of distribution networks. In many countries different technical rules have been introduced in order to integrate the DG units in the medium voltage (MV) and low voltage (LV) distribution network. New standards state requirements for all generators, included inverter based ones, imposing a Fault Ride Through (FRT) philosophy and new active and reactive power regulation actions with the aim of maintaining the transmission system stability at the level it was with traditional rotating generators, or even increasing it. These technical rules may not be fully compliant with the automatic reclosing cycle usually performed from the CB at the beginning of MV feeders and/or with the automatic selection procedure of faulty section selection and supply restore to healthy ones. In this paper the effects of DG units connected at MV and LV voltage level in relation to different fault conditions are analysed. The possibility of temporary uncontrolled islanded operations are investigated in order to evaluate the role of new Standards or Regulatory or Law requirements in the automatic reclosing procedure and MV network automation.","PeriodicalId":414838,"journal":{"name":"2014 49th International Universities Power Engineering Conference (UPEC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129125096","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 : 2014-10-23DOI: 10.1109/UPEC.2014.6934626
S. Balasubramaniam, Jun Liang, C. E. Ugalde-Loo
Increased offshore wind penetration has raised the need of multi-terminal high-voltage direct-current (MTDC) grids. An MTDC system will enable cross-border energy exchange where the excessive energy can be transferred between countries, increasing the functionality and reliability of the network. However, as the number of terminals and branches increases, power flow management becomes a challenge. To improve reliability and efficiency, power flow needs to be rescheduled between terminals. This can be achieved by introducing a power flow controller (PFC). In this paper, an insulated-gate bipolar transistor based series PFC is proposed. A PFC is basically a low power rated controllable voltage source connected in series with a DC line. It enables the regulation of grid power flow via a small series voltage injection. A four-terminal MTDC system is modelled using Simulink/ SimPowerSystems to test the impact of the proposed device. This is analysed under two different control strategies for the voltage source converter-based terminals; namely, master-slave and voltage droop control. Simulation results show that the PFC is capable of enhancing the system performance by suitably redirecting the power flow at the point of connection. Moreover, the results clearly illustrate that the converter control modes effectively affect the power flow in the MTDC grid.
{"title":"An IGBT based series power flow controller for multi-terminal HVDC transmission","authors":"S. Balasubramaniam, Jun Liang, C. E. Ugalde-Loo","doi":"10.1109/UPEC.2014.6934626","DOIUrl":"https://doi.org/10.1109/UPEC.2014.6934626","url":null,"abstract":"Increased offshore wind penetration has raised the need of multi-terminal high-voltage direct-current (MTDC) grids. An MTDC system will enable cross-border energy exchange where the excessive energy can be transferred between countries, increasing the functionality and reliability of the network. However, as the number of terminals and branches increases, power flow management becomes a challenge. To improve reliability and efficiency, power flow needs to be rescheduled between terminals. This can be achieved by introducing a power flow controller (PFC). In this paper, an insulated-gate bipolar transistor based series PFC is proposed. A PFC is basically a low power rated controllable voltage source connected in series with a DC line. It enables the regulation of grid power flow via a small series voltage injection. A four-terminal MTDC system is modelled using Simulink/ SimPowerSystems to test the impact of the proposed device. This is analysed under two different control strategies for the voltage source converter-based terminals; namely, master-slave and voltage droop control. Simulation results show that the PFC is capable of enhancing the system performance by suitably redirecting the power flow at the point of connection. Moreover, the results clearly illustrate that the converter control modes effectively affect the power flow in the MTDC grid.","PeriodicalId":414838,"journal":{"name":"2014 49th International Universities Power Engineering Conference (UPEC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130875747","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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