2017 52nd International Universities Power Engineering Conference (UPEC)最新文献

{"title":"Positive corona characteristics on RTV SIR coated glass insulating surface under ramp high voltages","authors":"N. C. Mavrikakis, P. Mikropoulos","doi":"10.1109/UPEC.2017.8231923","DOIUrl":"https://doi.org/10.1109/UPEC.2017.8231923","url":null,"abstract":"Positive corona discharge activity along glass surfaces, in pure form and coated with room temperature vulcanized silicone rubber (RTV SIR), bridging a short needle-plane gap is investigated under positive ramp high voltages. The case or air alone was considered as reference. At applied voltages just sufficient for discharge inception up to values causing flashover, the discharge current and the associated temperature rise of the insulating surfaces were measured; thus, I-U characteristics were obtained. In the presence of an insulating surface the glow discharge is suppressed but streamer formation is favoured. Surface corona inception, stable streamer formation and flashover occur at significantly lower voltages than those obtained in the case of air alone. Surface temperature starts to increase above the ambient value when the stable streamer discharge is formed. During the stable streamer regime the insulating surface temperature is closely related to the streamer current. Both the maximum temperature reached immediately before flashover and the cumulative energy required for flashover are higher for the RTV SIR coated than pure glass surface. The temperature rise on the RTV SIR coated glass surface never exceeded ∼10 oC, thus it cannot be considered as crucial in terms of thermal degradation of the material.","PeriodicalId":272049,"journal":{"name":"2017 52nd International Universities Power Engineering Conference (UPEC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127119009","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":"Short-term electricity load forecasting for the integrated single electricity market (I-SEM)","authors":"K. Kavanagh, M. Barrett, M. Conlon","doi":"10.1109/UPEC.2017.8231994","DOIUrl":"https://doi.org/10.1109/UPEC.2017.8231994","url":null,"abstract":"The electricity market structure in Ireland is being reconstructed in order to meet with the requirements of the EU Third Energy Package. The forthcoming Integrated-Single Electricity Market (I-SEM) differs from the current market structure in many ways. However this research addresses the issue of balance responsibility under the I-SEM. Given the volatility of prices in the Balancing market, observed in similarly-structured markets around the world, Irish supply companies need to be able to accurately forecast their customers' load in the Day-Ahead market in order to manage risk in the Balancing market. This paper presents a means for suppliers to implement short-term load forecasting (STLF) of electricity. A Neural Network model is used as well as a Double Seasonal Exponential Smoothing variation of the Holt-Winters method. Data from the Irish market was used to forecast a supply company's load as well as the national load, using these methods. Measured by MAPE (mean absolute percentage error), both methods produced positive results of below 3%. It is envisaged that with these results, a supply company operating in the Irish market should be able to apply these forecasting methods to their historical customer data to submit modestly accurate bids, with the intention of securing their position in the Day-Ahead market and reducing the potential of any financial implications accruing in the Balancing market.","PeriodicalId":272049,"journal":{"name":"2017 52nd International Universities Power Engineering Conference (UPEC)","volume":"280 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127288375","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":"Performance assessment of a low power wide area network in rural smart grids","authors":"C. H. Barriquello, D. Bernardon, L. Canha, F. E. Soares e Silva, D. Porto, Maicon J. da Silveira Ramos","doi":"10.1109/UPEC.2017.8231904","DOIUrl":"https://doi.org/10.1109/UPEC.2017.8231904","url":null,"abstract":"The deployment of smart grid communication networks (SGCN) in urban areas has been possible due to the huge availability of wired and wireless communication technologies. However, in rural areas, those communications options are usually not available, unsuitable and/or too costly, making the deployment of a SGCN more challenging in such a case. On the other hand, the recently introduced low power wide area (LPWA) networks can be suitable candidates to overcome such a problem, with the enablement of low cost, low power and long range wireless communications as required in rural smart grids. Therefore, in this paper, we study the feasibility of LPWANs as SGCNs for rural areas. Through simulations, we assess the performance of LoRaWAN, which is one the main available LPWA technologies, in terms of network performance metrics, such as range, coverage, latency and packet delivery ratio. For the simulations, a real rural power grid scenario has been chosen as a case study, which comprises an approximate area of 4000 km2, at South Brazil, and delivers power to more than 200 consumers. Based on the obtained results, we conclude the paper with some considerations that may serve as guidelines for the technicians and engineers working to deploy LPWA networks for rural smart grids. Moreover, we discuss further opportunities and challenges in this field of research.","PeriodicalId":272049,"journal":{"name":"2017 52nd International Universities Power Engineering Conference (UPEC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127231727","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":"Model in the loop simulation of an electric propulsion system using virtual reality","authors":"György Tamás, D. Fodorean","doi":"10.1109/UPEC.2017.8232024","DOIUrl":"https://doi.org/10.1109/UPEC.2017.8232024","url":null,"abstract":"This paper presents a preliminary study for a virtual reality simulation for testing the behavior of electric propulsion systems in electrical traction applications. The car model is realized and connected to the propulsion model in MATLAB Simulink whereas the inputs for the model are coming from the Virtual Reality Environment (VRE).","PeriodicalId":272049,"journal":{"name":"2017 52nd International Universities Power Engineering Conference (UPEC)","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123008197","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":"Economic analysis of the impact of the installation of PV systems considering power quality aspects","authors":"C. B. F. Darui, L. Piotrowski, T. G. Lucca, I. C. Figueiró, N. K. Neto","doi":"10.1109/UPEC.2017.8231951","DOIUrl":"https://doi.org/10.1109/UPEC.2017.8231951","url":null,"abstract":"The strong dependency of Brazilian electricity generation on hydroelectric power generation is driving the Brazilian scientific community to look for alternative renewable energy sources, such as solar, especially because its large potential. Despite its own advantages, solar generation can affect the operation of the system. Regarding that, this paper aims at performing economical and technical analysis of the impact of the installation of solar panels, considering the impacts over the power quality of the consumer's facilities. A study case is performed in the distribution network of a university, located in the south of Brazil. First, a diagnostic of the network is performed through energy monitoring. After that, the size of the solar generation system is determined aiming at achieving a satisfactory level of self-consumption. The power generation is estimated considering an analytic method. Simulations are performed in the software OpenDSS in order to determine the impact over the power quality of the facilities and to evaluate the necessity of adequacy of the facilities. The total costs of the installation of the solar system are determined considering the additional costs related to the power quality issues.","PeriodicalId":272049,"journal":{"name":"2017 52nd International Universities Power Engineering Conference (UPEC)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123111256","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":"Investigating the impact of decentralized energy storage systems in active low-voltage distribution networks","authors":"Angelos I. Nousdilis, G. Papagiannis, Georgios C. Christoforidis","doi":"10.1109/UPEC.2017.8231944","DOIUrl":"https://doi.org/10.1109/UPEC.2017.8231944","url":null,"abstract":"Photovoltaic (PV) penetration in Low-Voltage (LV) networks is expected to increase in the following years, posing a series of problems in the operation pf low-voltage networks. Among the most important challenges imposed, is the reverse power flow caused by high injected energy from distributed PVs during peak irradiation hours. This is the reason of voltage rises above the permissible limits. Amongst other solutions, such as active power curtailment and reactive power absorption, the installation of distributed Energy Storage Systems (ESS) seems to be an attractive solution since it can absorb surplus power locally, avoiding curtailment methods, power flow losses on the feeder and grid reinforcements. As the cost of storage is decreasing, ESS are expected to be increasingly adopted by prosumers. This work evaluates the influence of such systems on the voltage profile of LV feeders and on the self-consumed energy of prosumers. Intensive simulations on a benchmark feeder assess the conflicted benefits of power system operators and ESS owners.","PeriodicalId":272049,"journal":{"name":"2017 52nd International Universities Power Engineering Conference (UPEC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126024981","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":"Design of electrical power supply system in a typical petroleum refinery","authors":"Z. Makani, S. Daniel Chowdhury","doi":"10.1109/UPEC.2017.8231942","DOIUrl":"https://doi.org/10.1109/UPEC.2017.8231942","url":null,"abstract":"The electrical system shall be designed economically for continuous and reliable services, safely to personnel and equipment, ease of maintenance and operation, minimum power losses, protection of equipment mechanically, interchangeability of equipment and addition of the of the loads. In order to achieve the above goals and obtain the desired results, a scientific study based on different theories and practical experiences will be needed. In this study, the power supply of Transnet Pipeline Terminal 2 (TM2) petroleum refinery in Heidelberg, the criteria and methods of designs of normal networks, electrical equipment and protection of the system will be discussed and investigated. A single line diagram will be presented as the outcome of the design. The single line diagram includes 88kV, 11kV and 400V voltage levels. In the second phase of the design single line diagram is consequently simulated by the ETAP software. The study will cover the following: load flow, short circuit current and motor starting. The intention of this study is to create solution in different ways, electrical loads should be categorized in this energy industry as well as energizing these loads by a stable power supplies. In addition the key role of the short circuit impedance of the transformers in control of the short circuit will be presented. Furthermore the selection procedure of the electrical equipment and accessories including cables, transformers, circuit breaker, relays, and etc. are presented. The following factors such as the size of equipment, losses and voltage drops will be checked by load flow study. A comprehensive study of the short circuit current calculations is implanted and can be observed how the system can be checked by the results of this study. In the dynamic study of the system, the biggest motor starting is simulated and the impacts of the voltage dips due to starting of this motor on the other running motors are shown. Since numerous types of equipment on one hand and the research on the economic matters on the other hand are time consuming, the scope of this report will mainly concentrate on the technical factors and as a results it does not cover the economic aspects. Moreover, high standard engineering in the petroleum industry is essential to design electrical system. It is noted that more economical options are acceptable as long as they end up with the same technical results or better.","PeriodicalId":272049,"journal":{"name":"2017 52nd International Universities Power Engineering Conference (UPEC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116148043","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":"MVAC submarine cable, impedance measurements and analysis","authors":"Martin T. Arentsen, Adrian Expethit, M. V. Pedersen, Sebastian B. S⊘rensen, F. Faria da Silva, Dominique A. S⊘rensen","doi":"10.1109/UPEC.2017.8231860","DOIUrl":"https://doi.org/10.1109/UPEC.2017.8231860","url":null,"abstract":"Due to environmental concerns an increase in off-shore windfarms has been observed in recent years, leading to an increased demand for three-core-wire-armoured submarine cables. However, the IEC Standard 60287 used to calculate the ampacity of these cables is widely recognized as being not accurate. Several recent studies have shown that the standard overestimates the cable losses, which results in over-dimensioning the cables and hence higher costs. The studies claim that the over-dimensioning might be due to the collective wire-armour which electromagnetic behaviour is not considered accurately by the standard. This paper investigates the standard inaccuracies, by conducting comprehensive measurements on a three-core-wire-armoured submarine cable. Firstly, DC measurements are conducted in order to investigate the connections between cable components (screen-screen and screens-armour) as this may influence the losses. Secondly, cable parameters such as component impedances, positive-, zero-sequence impedances and losses are measured for varying currents and frequencies. Zero sequence is measured for two setups, one with armour grounded, and with armour open to match CIGREs formula assumption that no currents flows in armour. Finally, the results are compared to a PSCAD model and calculations based on CIGRÉ and IEC formulas. It is found that IEC 60287 overestimates the losses, as expected, but the difference is much smaller than found in other studies. A deviation in the calculation of zero-sequence impedance is found between the measurements and the CIGRÉ formulas. It is concluded that the formulas are not accurate for the specific cable under test.","PeriodicalId":272049,"journal":{"name":"2017 52nd International Universities Power Engineering Conference (UPEC)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131415620","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":"Observability of low voltage grids: Actual DSOs challenges and research questions","authors":"Rubén Sánchez, F. Iov, Mohammed S. Kemal, Maria Stefan, R. Olsen","doi":"10.1109/UPEC.2017.8232008","DOIUrl":"https://doi.org/10.1109/UPEC.2017.8232008","url":null,"abstract":"Low Voltage (LV) distribution power grids are experiencing a transformation from a passive to a more active role due to the increasing penetration of distributed generation, heat pumps and electrical vehicles. The first step towards a smarter operation of LV electrical systems is to provide grid observability in the control centers. In some countries like Denmark, the rollout of Advanced Metering Infrastructures (AMI) has reached 100%. However, the vast amount of data sent from the smart meters to the control centers stresses the communication network, and complicates the data processing tasks. It becomes unrealistic to provide near real time full observability of the LV grid by applying Distribution System State Estimation (DSSE) utilizing the classical data collection and storage/preprocessing techniques. This paper investigates up-to-date the observability problem in LV grids by providing an updated state of the art on DSSE-AMI based, adaptive data collection techniques and database management system types. Moreover, the ongoing Danish RemoteGRID project is presented as a realistic case study.","PeriodicalId":272049,"journal":{"name":"2017 52nd International Universities Power Engineering Conference (UPEC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133661946","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":"Optimization techniques for parameter estimation of dynamic load models","authors":"Georgios A. Barzegkar-Ntovom, O. Ceylan, T. Papadopoulos","doi":"10.1109/UPEC.2017.8231997","DOIUrl":"https://doi.org/10.1109/UPEC.2017.8231997","url":null,"abstract":"In this paper, the performance of different optimization techniques is evaluated for the estimation of dynamic load model parameters. Two categories of methods are considered: the nonlinear least-squares-based and the population-based. The accuracy of the optimization methods is assessed by applying Monte Carlo simulations using artificially created distorted data. In order to represent different real-world conditions, the performance of the methods is evaluated considering different levels of signal-to-noise ratio. The findings of this paper indicate that similar results are obtained by the different techniques examined and verify the validity of the optimization methods for parameter estimation of dynamic load models.","PeriodicalId":272049,"journal":{"name":"2017 52nd International Universities Power Engineering Conference (UPEC)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114655469","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}