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2019 54th International Universities Power Engineering Conference (UPEC)最新文献

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Impact factors on the 2nd zone of distance protection under integration of modular multilevel converters 模块化多电平变流器集成下距离保护二区影响因素分析
2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI: 10.1109/UPEC.2019.8893639
C. Brantl
{"title":"Impact factors on the 2nd zone of distance protection under integration of modular multilevel converters","authors":"C. Brantl","doi":"10.1109/UPEC.2019.8893639","DOIUrl":"https://doi.org/10.1109/UPEC.2019.8893639","url":null,"abstract":"The introduction of an increasing number of converters in the existing AC systems has led to a series of challenges. One of them is securing the stability of the existing AC grids in case of faults. Several publications indicate a negative impact of modular multilevel converters (MMC) on the AC distance protection, especially on its second zone. This work reviews the existing contributions and analyses the considered topologies and impact factors. Based on this analysis, study cases are derived to compare the impact of an MMC on the distance protection to other impact factors. Thereafter a differentiation between the factors resulting from the chosen system configuration and the impact of the MMC is given. The results show that there is an impact of the MMC on the second zone due to the given system topology. However, due to its limited fault current contribution capability, the impact does not exceed the variation due to other impact factors. Depending on the previously existing system conditions, the impact of an MMC inserted into an existing line is negligible in a meshed AC grid due to its limited short circuit current contribution.","PeriodicalId":6670,"journal":{"name":"2019 54th International Universities Power Engineering Conference (UPEC)","volume":"37 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90866460","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}
引用次数: 1
Series Compensation to Increase Power Flow: A Case Study on the Irish Transmission System 串联补偿增加潮流:以爱尔兰输电系统为例
2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI: 10.1109/UPEC.2019.8893636
Aidan Heffernan, Jane Courtney
{"title":"Series Compensation to Increase Power Flow: A Case Study on the Irish Transmission System","authors":"Aidan Heffernan, Jane Courtney","doi":"10.1109/UPEC.2019.8893636","DOIUrl":"https://doi.org/10.1109/UPEC.2019.8893636","url":null,"abstract":"Ireland presents an interesting case study for transmission network strengthening. The majority of load in the country is located at the nation’s capital, Dublin, in the East, while most of the new conventional generation and renewable generation are found in the South-West. Power is transferred between the two via a 400 kV network. This leads to large cross- country power flows. This power distribution disparity is due to increase. A large thermal generating station which is connected to the 400 kV system in the West, will close by 2025. This generation will be replaced partially with wind generation in the South West, which is connected at 110 kV and 220 kV. This can cause power flow to avoid the 400 kV network, leading to less efficiency, overloading and other issues associated with power flow on lower voltage networks.In this paper, the application of series compensation on the 400 kV transmission network in Ireland for increasing power transfer capability is investigated and a viable solution is found. The lower voltage network is modelled to investigate the effects of 400 kV series compensation on the rest of the network. With our series compensation solution on the 400 kV network, power flows are successfully reduced on the 110 kV network as the lower reactance of the 400 kV network now attracts power to flow through the more stable and less lossy 400 kV network.","PeriodicalId":6670,"journal":{"name":"2019 54th International Universities Power Engineering Conference (UPEC)","volume":"87 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81264147","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}
引用次数: 0
Investigation of Thermal Boundary Conditions During Heat Cycle Tests on HVDC Cables 高压直流电缆热循环试验热边界条件研究
2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI: 10.1109/UPEC.2019.8893442
S. Frobin, F. Jenau
{"title":"Investigation of Thermal Boundary Conditions During Heat Cycle Tests on HVDC Cables","authors":"S. Frobin, F. Jenau","doi":"10.1109/UPEC.2019.8893442","DOIUrl":"https://doi.org/10.1109/UPEC.2019.8893442","url":null,"abstract":"The number of installed high voltage direct current cables is steadily increasing. The electric field distribution in HVDC cables is determined by the electrical conductivity. The temperature distribution is therefore a field-determining factor, since the electrical conductivity of the insulating medium is strongly dependent on the temperature. The temperature distribution can be calculated using analytical or numerical models on the one hand and determined experimentally using heat cycle tests on full-scale cables on the other hand. In order to control the thermal boundary conditions of cables exposed to the air during test procedure, the cables are often covered with thermally stable flexible elastomeric foam. The question arises to what extent the thermal conditions of the cables buried in the soil can be reproduced by using the flexible elastomeric foam during heat cycle tests. For this reason, this publication compares the temperature distribution in buried cables with those in foam-covered cables and describes the impact of the use of flexible elastomeric foam on the temperature profile in the cable.","PeriodicalId":6670,"journal":{"name":"2019 54th International Universities Power Engineering Conference (UPEC)","volume":"6 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88841902","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}
引用次数: 0
Energy Storage Systems Role in Supporting Renewable Resources: Global Overview 储能系统在支持可再生资源中的作用:全球概述
2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI: 10.1109/UPEC.2019.8893470
F. Lucchese, L. Canha, W. Brignol, B. K. Hammerschmitt, L. D. da Silva, C. C. Martins
{"title":"Energy Storage Systems Role in Supporting Renewable Resources: Global Overview","authors":"F. Lucchese, L. Canha, W. Brignol, B. K. Hammerschmitt, L. D. da Silva, C. C. Martins","doi":"10.1109/UPEC.2019.8893470","DOIUrl":"https://doi.org/10.1109/UPEC.2019.8893470","url":null,"abstract":"The greater concern about climate change and the decarbonization of electric energy production plants has led to an exponential renewable energy increase in many countries, employing specially wind and solar resources. The increase investment in these new sources are necessary to support a sustainable future, with a cleaner and diversified energy matrix. However, the output of these sources is considered intermittent, depending on climatic variables, which often presents an unpredictable forecast. To minimize these effects, it is necessary to introduce energy storage systems, with the objective to simplify the transformation of the electrical system from a rigid to a more flexible platform, combining viable solutions integrating the new generation facilities. In this context, this paper aims to shine a light in the expansion of the energy storage systems combined with the renewable energy evolution around the world. Through a comprehensive review of energy storage technologies used, as well in the participation of these systems in different countries electric systems. Providing a market perspective of the storage technology in the present global scenario, along with new enterprises projections employing energy accumulators.","PeriodicalId":6670,"journal":{"name":"2019 54th International Universities Power Engineering Conference (UPEC)","volume":"84 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77359313","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}
引用次数: 5
Analysis of the Kazakhstan’s Grid Oscillation Instability by using Wams System and PSCAD Program 利用Wams系统和PSCAD程序分析哈萨克斯坦电网振荡失稳
2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI: 10.1109/UPEC.2019.8893487
A. Bektimirov, K. Tokhtibakiyev, A. Saukhimov, N. Nurtaza
{"title":"Analysis of the Kazakhstan’s Grid Oscillation Instability by using Wams System and PSCAD Program","authors":"A. Bektimirov, K. Tokhtibakiyev, A. Saukhimov, N. Nurtaza","doi":"10.1109/UPEC.2019.8893487","DOIUrl":"https://doi.org/10.1109/UPEC.2019.8893487","url":null,"abstract":"The article presents the results of the low-frequency oscillations (LFO) study for the North-South transit of the Kazakhstan’s national electric grid (NEG) by using the monitoring system WAMS and modeling the operating conditions of power system in the PSCAD program. Given the results of monitoring and analyzing the parameters of LFO with frequencies from 0,1 to 0,7 Hz and their magnitude in the normal operating condition. During the testing of the WAMS in the power system were recorded several emergency events. By using the PSCAD program was performed verification of the experimentally obtained LFO. Has been revealed an insufficient degree of LFO damping on the North-South transit. As a result of poor damping oscillations, there is a risk of blackout, as well as the probability of a decrease in the capacity of the transmission lines. For increase, the oscillation stability requires implementation of the adaptive PSS principles.","PeriodicalId":6670,"journal":{"name":"2019 54th International Universities Power Engineering Conference (UPEC)","volume":"1 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91368617","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}
引用次数: 2
UPEC 2019 Keynote Speaker UPEC 2019主题演讲
2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI: 10.1109/upec.2019.8893571
{"title":"UPEC 2019 Keynote Speaker","authors":"","doi":"10.1109/upec.2019.8893571","DOIUrl":"https://doi.org/10.1109/upec.2019.8893571","url":null,"abstract":"","PeriodicalId":6670,"journal":{"name":"2019 54th International Universities Power Engineering Conference (UPEC)","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87330876","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}
引用次数: 0
Corona Effects on AC Circuits on an Indonesian 500 kV Hybrid Overhead Line 印度尼西亚500kv混合架空线路交流回路的电晕效应
2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI: 10.1109/UPEC.2019.8893564
Andhika Rizki Pratama, Suwarno, O. Pischler, U. Schichler
{"title":"Corona Effects on AC Circuits on an Indonesian 500 kV Hybrid Overhead Line","authors":"Andhika Rizki Pratama, Suwarno, O. Pischler, U. Schichler","doi":"10.1109/UPEC.2019.8893564","DOIUrl":"https://doi.org/10.1109/UPEC.2019.8893564","url":null,"abstract":"Converting an AC circuit of an existing multi circuit overhead line (OHL) to DC is a promising solution to increase the OHL’s transmission capacity. This is called a \"hybrid OHL\". Because of the small distances, electromagnetic coupling occurs between the AC and DC circuits. This influences conductor surface gradients, which in return affects corona effects such as audible noise (AN). In this contribution, a case study regarding a fictive Indonesian hybrid OHL is used to present AC surface gradient calculations under DC influence. Furthermore, results from laboratory experiments are presented. The aim of the experiments was to explore the AN behavior of AC lines under DC influence. Additionally, the performance of noise reducing surface treatments under hybrid conditions has been investigated. The gathered results show that an AC line’s corona behavior worsens substantially under DC influence. Surface treatments, however, seem to retain their noise reducing effects even under hybrid influences.","PeriodicalId":6670,"journal":{"name":"2019 54th International Universities Power Engineering Conference (UPEC)","volume":"36 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90606306","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}
引用次数: 1
Simulative Calculation of the Grid-Connected Inverter Impedance for Harmonic Studies 并网逆变器阻抗仿真计算用于谐波研究
2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI: 10.1109/UPEC.2019.8893508
Alexander Neufeld, Merlin J. Alkemper, Nils Schäkel, L. Hofmann
{"title":"Simulative Calculation of the Grid-Connected Inverter Impedance for Harmonic Studies","authors":"Alexander Neufeld, Merlin J. Alkemper, Nils Schäkel, L. Hofmann","doi":"10.1109/UPEC.2019.8893508","DOIUrl":"https://doi.org/10.1109/UPEC.2019.8893508","url":null,"abstract":"The issue of the harmonic stability in weak grids including a high amount of power electronic components has become a major topic in recent years. High frequency interactions between the controllers of the grid-connected voltage-source converters and the grid impedance are not only considered a power quality topic. The problem has been dealt with by applying control theory stability criteria to the converters and their controls connected to the grid. The converter is being described analytically in the frequency domain by their equivalent impedance or by means of the state space representation and eigenvalue analysis. This paper proposes a method for extracting the inverter impedance from time domain simulations that is described and applied to a grid-connected inverter. Furthermore, a recommendation for simplification of the time domain model for harmonic studies is given. The extracted impedance is used for a harmonic stability analysis using a simple example.","PeriodicalId":6670,"journal":{"name":"2019 54th International Universities Power Engineering Conference (UPEC)","volume":"18 1 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91215265","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}
引用次数: 2
Implications for the Rate of Change of Frequency on an Isolated Power System 对隔离电力系统频率变化率的影响
2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI: 10.1109/UPEC.2019.8893446
Michael O’Donovan, Eoghan O'Callaghan, N. Barry, J. Connell
{"title":"Implications for the Rate of Change of Frequency on an Isolated Power System","authors":"Michael O’Donovan, Eoghan O'Callaghan, N. Barry, J. Connell","doi":"10.1109/UPEC.2019.8893446","DOIUrl":"https://doi.org/10.1109/UPEC.2019.8893446","url":null,"abstract":"The Irish power system illustrates today the main issues which many power systems need to address from an operations and control viewpoint, i.e. the advent of stochastic generation in the form of wind, solar and wave energy, and the change in the constitution of the electrical loads. This paper examines RoCoF standards and protection and presents a practical example of testing the RoCoF capabilities of on-load generators in a live pumped storage hydro station. The technical reasons and mathematical basis for carrying out these tests are included to provide context to the example described. Results for each test are provided with illustrative plots for reference.","PeriodicalId":6670,"journal":{"name":"2019 54th International Universities Power Engineering Conference (UPEC)","volume":"89 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89128128","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}
引用次数: 3
Single-terminal Fault Location Algorithm for Electrical Lines 电力线路单端故障定位算法
2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI: 10.1109/UPEC.2019.8893618
Marian Dragomir, Anamaria Iamandi, A. Rusu, Marian Atănăsoaei, A. Dragomir, M. Adam, M. Andrusca
{"title":"Single-terminal Fault Location Algorithm for Electrical Lines","authors":"Marian Dragomir, Anamaria Iamandi, A. Rusu, Marian Atănăsoaei, A. Dragomir, M. Adam, M. Andrusca","doi":"10.1109/UPEC.2019.8893618","DOIUrl":"https://doi.org/10.1109/UPEC.2019.8893618","url":null,"abstract":"Precise fault location can minimize the outage time of a faulted line with benefits in power grid stability and safety. Impedance-based fault location algorithms are commonly used in fault locators, due to their simplicity. In particular, single-terminal impedance-based algorithms represent a standard feature implemented in digital relays, but they are affected by the different source of errors. In the paper, there is presented a fault location algorithm which uses only the local voltage and current phasors and the parameters of the line to estimate the distance to the fault. The algorithm was tested using simulated fault signals as well as real fault registered signals from the field. The output results were compared with the output results of two established fault location algorithms and they reveal the effectiveness and robustness of the proposed algorithm.","PeriodicalId":6670,"journal":{"name":"2019 54th International Universities Power Engineering Conference (UPEC)","volume":"65 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85005197","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}
引用次数: 3
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