Esraa F. Shaaban, Abd El-Wahab Hassan, D. Mansour, W. Yuan
{"title":"Application of SMES for voltage stabilization of PMSG connected to DC grids","authors":"Esraa F. Shaaban, Abd El-Wahab Hassan, D. Mansour, W. Yuan","doi":"10.1109/UPEC.2018.8541934","DOIUrl":"https://doi.org/10.1109/UPEC.2018.8541934","url":null,"abstract":"With DC grids, the usage of PMSG becomes more feasible due to the saving of inverter stage. However, integration of PMSG with DC grids faces some technical problems. The most critical problem is voltage stabilization. Any sudden change in wind power is suddenly reflected on the output voltage and power. So, this paper aims to use Superconducting Magnetic Energy Storage (SMES) for voltage stabilization of PMSG connected to DC grids. The proposed system was modeled using MATLAB software. The control scheme has been built so that SMES can be operated in charging mode, discharging mode, or freewheeling mode. A proportional integral (PI) controller is used to provide accurate pulse width modulation (PWM) for the switches to control SMES output voltage. Before using SMES, the output power of PMSG was fluctuated with an impact on voltage profile of the DC bus. After using SMES, a smooth power has been delivered to the load.","PeriodicalId":340842,"journal":{"name":"2018 53rd International Universities Power Engineering Conference (UPEC)","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132151996","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}
L. Wyrwoll, Katharina Kollenda, Christoph Müller, A. Schnettler
{"title":"Impact of Flow-Based Market Coupling Parameters on European Electricity Markets","authors":"L. Wyrwoll, Katharina Kollenda, Christoph Müller, A. Schnettler","doi":"10.1109/UPEC.2018.8541904","DOIUrl":"https://doi.org/10.1109/UPEC.2018.8541904","url":null,"abstract":"Market coupling is becoming increasingly important for the European electricity markets. The introduction of Flow-Based Market Coupling led to more efficient electricity exchange, but also entailed an increase in complexity. Grid elements are considered as a simplified model for market coupling. The parameterization has a significant impact on market results. This paper explains the modeling of Flow-Based Market Coupling in the context of an electricity market simulation and the determination of relevant input parameters. The associated simulation results and sensitivities concerning electricity exchange and generation are analyzed. From a modeling point of view, different parameterizations for a more precise mapping of the electricity exchange as well as possible simplifications are discussed, from a content perspective a trade-off between the highest possible trading and grid security is debated.","PeriodicalId":340842,"journal":{"name":"2018 53rd International Universities Power Engineering Conference (UPEC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126266540","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":"Overview and Assessment of Superconducting Technologies for Power Grid Applications","authors":"Patrick McGuckin, G. Burt","doi":"10.1109/UPEC.2018.8541928","DOIUrl":"https://doi.org/10.1109/UPEC.2018.8541928","url":null,"abstract":"It is expected that superconducting technologies will play an important role in the future smart grid because their application brings a host of benefits, most notably a decrease power loss that allows for overload relief, the lowering of voltage levels, power quality enhancement and subsequent grid stability. The phenomenon of superconductivity brings these potential qualities to the grid in the form of a number of technologies analogous to the commonly accepted, conventional types in the form of cabling, fault current limiters, energy storage (ES), generators and transformers. This paper aims to provide an overview of these technologies and their current and potential applications.","PeriodicalId":340842,"journal":{"name":"2018 53rd International Universities Power Engineering Conference (UPEC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126586354","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}
M. Ashouri, H. Khazraj, F. D. da Silva, C. Leth Bak
{"title":"Protection of Multi-Terminal VSC-HVDC Grids Based on the Response of the First Carrier Frequency Harmonic Current","authors":"M. Ashouri, H. Khazraj, F. D. da Silva, C. Leth Bak","doi":"10.1109/UPEC.2018.8541900","DOIUrl":"https://doi.org/10.1109/UPEC.2018.8541900","url":null,"abstract":"Protection of multi-terminal Voltage Source Converter based High Voltage Direct Current (VSC-MTDC) grids is a major challenge for future practical DC transmission technology. According to the harmonic-based protection studies, the response of first carrier frequency harmonic (FCFH) current in Pulse Width Modulation (PWM)-based VSC-HVDC can be used to discriminate external AC faults in point to point VSC-HVDC systems. However, the application of FCFH current for a selective fault detection system in VSC-MTDC grids is not studied yet. This research investigates FCFH current existed in converter DC link measured data, to detect the faulty section in VSC-MTDC system, when the system face faults with variations in location and resistance. A radial VSC-MTDC system with 2-level PWM VSC converters is simulated in PSCAD and MATLAB is used to extract FCFH current based on short-time Fourier transform. Based on the relay locations, the results show the feasibility of the protection algorithm, in discriminating between internal and faults for each zone.","PeriodicalId":340842,"journal":{"name":"2018 53rd International Universities Power Engineering Conference (UPEC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116604848","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}
A. Eales, L. Archer, H. Buckland, D. Frame, S. Galloway
{"title":"Feasibility Study for a Solar PV Microgrid in Malawi","authors":"A. Eales, L. Archer, H. Buckland, D. Frame, S. Galloway","doi":"10.1109/UPEC.2018.8542002","DOIUrl":"https://doi.org/10.1109/UPEC.2018.8542002","url":null,"abstract":"Energy is an enabler for development but electricity access is still unobtainable for over 1 million people in developing countries. In Malawi, less than 12% of the population have access to grid electricity and in rural areas this is as low as 1%. Solar microgrids are emerging as a cost competitive, low carbon and reliable method for offering energy access in developing countries. This paper provides a summary of the process and key findings in assessing technical and financial feasibility of a solar microgrid in Malawi, including system design definition, business model discussion and sensitivity analysis of key parameters through techno-economic modelling. The novel approach developed utilises qualitative and quantitative information gathering and assessment in an iterative way to design a robust energy access solution in the most viable local location. The results show that the upper limit of the ‘expected energy use’ can be up to 5 times higher than the designed energy limit. Higher demand grids are shown to present c.20% lower levelised cost of energy for the cases considered and conversely, the ‘low demand’ grid case is shown to have c.48% higher levelised cost of energy . This represents a significant range of uncertainly in energy use prediction, which if not treated properly will adversely affect both energy access and microgrid business development. The research presented in this paper will address these challenges in the context of Malawi but is broadly applicable to other similar locations.","PeriodicalId":340842,"journal":{"name":"2018 53rd International Universities Power Engineering Conference (UPEC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121638650","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":"Innovative sensor for multiple conductor cables to increase the smartness of the distribution grid","authors":"Andreas Kjaergaard, P. Randewijk","doi":"10.1109/UPEC.2018.8542080","DOIUrl":"https://doi.org/10.1109/UPEC.2018.8542080","url":null,"abstract":"In this paper, a new type of combined voltage and current sensor will be presented. The disruptive sensor has the possibility of built-in protection functionality. It will be evident from the paper that the need for an alternative measuring method for retrofitting in the distribution grid is of the highest importance. It will be described how a cost efficient and innovative sensor can pave the way for the distribution grid to become just as smart as the transmission part of the grid already is. The measuring principles along with various application possibilities will be described. The paper will also present a description of an implementation of distance protection functionality in the sensor. The paper will conclude with initial results from the embedded implementation of distance relay functionality on the sensor.","PeriodicalId":340842,"journal":{"name":"2018 53rd International Universities Power Engineering Conference (UPEC)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123847267","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":"Determination of Premature Wear of Overhead Line Conductors in the Wake of a Wind Turbine","authors":"Niall P. Williams, T. Kavanagh","doi":"10.1109/UPEC.2018.8542069","DOIUrl":"https://doi.org/10.1109/UPEC.2018.8542069","url":null,"abstract":"Wind turbines situated near overhead lines have been identified as potentially having an effect on the lifetime of the conductor through increased fatigue wear as a result of their wake. The concern to overhead line designers is the increase in the occurrence of the low wind velocities required to establish the phenomenon known as aeolian vibration due to the presence of the turbine. If left unaddressed, this could lead to increased maintenance requirements, unplanned outages or even conductor failure.Of interest to this study is the effect of the wake of a wind turbine within the required clearance distance of three and a half times the rotor diameter (3.5D) from an overhead line, as defined for Ireland by the Irish Transmission System Operator EirGrid’s 2014 policy. Due to the relatively recent introduction of this policy, a number of overhead lines have been identified as being within this limit.Theoretical expectations based upon previous studies include an increase in the number of occurrences of wind velocities suitable for aeolian vibration due to the wind velocity reduction in the turbine’s wake, and therefore greater wear of the conductor.Conductor vibration amplitudes recorded with vibration monitors and wind velocity data from a nearby weather station were used in order to estimate the lifetime of the conductor by means of the CIGRE Safe Border Limit calculation. The results were used to estimate the potential impact of the wind turbine’s wake, and inform criteria for future field measurements to be conducted on additional overhead lines.","PeriodicalId":340842,"journal":{"name":"2018 53rd International Universities Power Engineering Conference (UPEC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124868085","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}
A. Fishov, I. Klavsuts, Nurlan A. Karjaubayev, D. Klavsuts
{"title":"Decentralized Smart Multi-Agent Voltage Regulation in Electric Grids. Ideology and Modeling","authors":"A. Fishov, I. Klavsuts, Nurlan A. Karjaubayev, D. Klavsuts","doi":"10.1109/UPEC.2018.8542109","DOIUrl":"https://doi.org/10.1109/UPEC.2018.8542109","url":null,"abstract":"The paper presents the principles of constructing Decentralized Multi-Agent System of compromising regulation of voltage in electric grids with the voltage of 0,4 – 110 kV by distributed means of compensation of reactive capacity, the possibilities of its modeling and the results of research of its operating capability and efficiency on a concrete example, including the one with the use of innovative patented devices of Demand Side Management – the Normalizer of AC voltage.","PeriodicalId":340842,"journal":{"name":"2018 53rd International Universities Power Engineering Conference (UPEC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114270493","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":"Analysis of Material Effect on Rail Impedance","authors":"M. Mirzaei, P. Ripka","doi":"10.1109/UPEC.2018.8541860","DOIUrl":"https://doi.org/10.1109/UPEC.2018.8541860","url":null,"abstract":"In this paper, two different solid iron materials are used for two different size rails. The internal impedances, resistances and inductances of the rails are evaluated and analyzed with time harmonic and time stepping finite element methods. Two solid iron materials have different B-H curves and electrical conductivities. The analysis will be presented for different currents at different frequencies, 10 Hz - 10 kHz. The inductance analysis using finite element method is also performed under simultaneous large DC signal and small AC signal.","PeriodicalId":340842,"journal":{"name":"2018 53rd International Universities Power Engineering Conference (UPEC)","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122682415","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}