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2015 50th International Universities Power Engineering Conference (UPEC)最新文献

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Investigation on line current compensation techniques for rectifier circuits 整流电路线路电流补偿技术的研究
2015 50th International Universities Power Engineering Conference (UPEC) Pub Date : 2015-12-03 DOI: 10.1109/UPEC.2015.7339828
C. Marouchos, M. Darwish, P. Panagiotis Dimitriadis, Andria Neroupou
{"title":"Investigation on line current compensation techniques for rectifier circuits","authors":"C. Marouchos, M. Darwish, P. Panagiotis Dimitriadis, Andria Neroupou","doi":"10.1109/UPEC.2015.7339828","DOIUrl":"https://doi.org/10.1109/UPEC.2015.7339828","url":null,"abstract":"Single phase rectifiers with a dc side smoothing capacitor produce a line current rich in odd harmonics. In this paper an investigation for different line current compensation techniques applied to AC/DC converters is presented. Five techniques are employed and simulation results for each are presented. One of the techniques is simplified in terms of control. Furthermore the circuit is analyzed using the switching function.","PeriodicalId":446482,"journal":{"name":"2015 50th International Universities Power Engineering Conference (UPEC)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123891422","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
Transient stability awareness based on regression analysis of stability margins 基于稳定裕度回归分析的暂态稳定感知
2015 50th International Universities Power Engineering Conference (UPEC) Pub Date : 2015-12-03 DOI: 10.1109/UPEC.2015.7339766
Tingjian Liu, You-bo Liu, Junyong Liu, Jing Gou, G. Taylor, Maozhen Li
{"title":"Transient stability awareness based on regression analysis of stability margins","authors":"Tingjian Liu, You-bo Liu, Junyong Liu, Jing Gou, G. Taylor, Maozhen Li","doi":"10.1109/UPEC.2015.7339766","DOIUrl":"https://doi.org/10.1109/UPEC.2015.7339766","url":null,"abstract":"In order to achieve online awareness of the transient stability of power systems, 10 different transient indicators that can be directly obtained or indirectly calculated using WAMS measurement data were chosen as original covariates for regression analysis of stability margins. Furthermore, feature covariates were consequently selected via a method called Nonparametric Independence Screening (NIS) so that the dimension of multivariate regression was reduced. Finally, a Group-Lasso algorithm was adopted to perform multivariate nonparametric regression in order to form a prediction function for transient stability awareness. An IEEE-39 bus case study demonstrated that the prediction function trained by correlation learning not only assessed the stability of the disturbed power system accurately, but also provided the evaluation of stability margin of the fault contingencies.","PeriodicalId":446482,"journal":{"name":"2015 50th International Universities Power Engineering Conference (UPEC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123767692","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
Risk assessment of major storm situation in distribution system 配电系统重大风暴形势风险评估
2015 50th International Universities Power Engineering Conference (UPEC) Pub Date : 2015-12-03 DOI: 10.1109/UPEC.2015.7339808
N. Dehghani, A. Supponen, S. Repo
{"title":"Risk assessment of major storm situation in distribution system","authors":"N. Dehghani, A. Supponen, S. Repo","doi":"10.1109/UPEC.2015.7339808","DOIUrl":"https://doi.org/10.1109/UPEC.2015.7339808","url":null,"abstract":"Risk and reliability have a significant connection in meaning; both of them are the facts for one inference. High level of risk is resource of lower reliability. Risk management in power system has a variety of different subjects including models, methods and applications. Risk is a mixture of probability of disturbance event and the negative effect of that occurrence. Usually it counted for random accident which has harmful effect on people's life and environment. In this paper risks study of storm situation modelled. Random failures in power system are the origin of risk and cannot control by staff. Monte-Carlo Simulation (MCS) has used to model the fault frequencies and outage time of customers. The two tools which use in financial studies to make investment decision and applicable in power systems are Value-at-Risk (VaR) and Conditional Value-at-Risk (CVaR) Result of study compared to the actual reliability which confirm the improvement in the reliability of system. It is not possible to predict the precise amount of load value, Concerns of power outage in local area and possibility of a general blackout.","PeriodicalId":446482,"journal":{"name":"2015 50th International Universities Power Engineering Conference (UPEC)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122881489","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
Modelling and simulation of load connected fixed blade wind turbine with permanent magnet synchronous generators 永磁同步发电机负载连接固定叶片风力发电机组建模与仿真
2015 50th International Universities Power Engineering Conference (UPEC) Pub Date : 2015-12-03 DOI: 10.1109/UPEC.2015.7339876
Ahmed S. Al-Toma, G. Taylor, M. Abbod
{"title":"Modelling and simulation of load connected fixed blade wind turbine with permanent magnet synchronous generators","authors":"Ahmed S. Al-Toma, G. Taylor, M. Abbod","doi":"10.1109/UPEC.2015.7339876","DOIUrl":"https://doi.org/10.1109/UPEC.2015.7339876","url":null,"abstract":"This paper presents the modelling and simulation of a wind turbine driven Permanent Magnet Synchronous Generator connected to a load. The system has been tested at different wind speeds. The machine side controller has been designed to match Maximum Power Point Tracking (MPPT) to obtain high extraction of wind power when connected to a load, while the load side controller fixes the DC voltage that is converted to the AC load voltage. Detailed plots of voltage and current profiles are also presented in the paper.","PeriodicalId":446482,"journal":{"name":"2015 50th International Universities Power Engineering Conference (UPEC)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121643801","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: 10
Optimal sitting and sizing of distributed generations in distribution networks using Heuristic Algorithm 用启发式算法优化配电网中分布式代的位置和规模
2015 50th International Universities Power Engineering Conference (UPEC) Pub Date : 2015-12-03 DOI: 10.1109/UPEC.2015.7339862
A. A. Abou El-Ela, A. M. Azmay, A. Shammah
{"title":"Optimal sitting and sizing of distributed generations in distribution networks using Heuristic Algorithm","authors":"A. A. Abou El-Ela, A. M. Azmay, A. Shammah","doi":"10.1109/UPEC.2015.7339862","DOIUrl":"https://doi.org/10.1109/UPEC.2015.7339862","url":null,"abstract":"This paper presents a proposed approach to determine the optimal sitting and sizing of distributed generation (DGs) with multi-system constraints to achieve two objective functions using Heuristic Algorithm (HA). The algorithm is established by carrying out a sensitivity analysis to determine the most candidate buses, which the DGs are established. Then, power flow calculations are performed to define the buses that violate their voltage constraints. A distributed generating unit is located at one of the candidate buses, which have high sensitivity factor, and then; the power flow calculations are repeated. With no voltage constraints violation, the situation is saved as an acceptable solution and the economic situations are evaluated, taking into account the overall voltage deviations of all buses. The best economic operation is achieved by minimizing the objective functions and satisfying all the system constraints. This procedure is repeated for a distributed generating unit placed at different candidate buses including placing two and three DG units. A database is built to define the best solution under various loading conditions. The proposed approach is applied to a real section of the South Delta Electricity Distribution network, as a part of the 11 kV Egyptian networks. The demonstrated results ensure that the proper sitting and sizing of DGs are important to improve the voltage profile, reduce the power flows in critical lines and reduce the system power losses. According to the different loading conditions and voltage status, the required output power from the DG is defined based on a pre-established database. The proposed approach can provide a practical and fast solution for the electricity production problem in Egypt with the best voltage improvements.","PeriodicalId":446482,"journal":{"name":"2015 50th International Universities Power Engineering Conference (UPEC)","volume":"501 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116718313","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
Performance evaluation of a four terminal HVDC systems for multi-directional power flow 多向潮流四端高压直流系统性能评价
2015 50th International Universities Power Engineering Conference (UPEC) Pub Date : 2015-12-03 DOI: 10.1109/UPEC.2015.7339851
Roberto Sandano, M. Basu, M. Farrell, M. Conlon
{"title":"Performance evaluation of a four terminal HVDC systems for multi-directional power flow","authors":"Roberto Sandano, M. Basu, M. Farrell, M. Conlon","doi":"10.1109/UPEC.2015.7339851","DOIUrl":"https://doi.org/10.1109/UPEC.2015.7339851","url":null,"abstract":"This paper presents a configuration of multi-terminal VSC-HVDC transmission system, suitable for large offshore wind farms. The chosen multi-terminal arrangement consists of four terminals of which there are two wind farms, and the rest two are grid connections that can absorb different power, based on pre-arranged master-slave agreement (Fig.1). Various power flow conditions between grid terminals are tested to show the VSC reverse power capability of each grid side terminal. Strongly varied wind condition are tested, to evaluate the overall stability of the MTDC system. Adopted direct control system, in configuration with DC slack bus, is studied to avoid fast communication devices between the all terminals. The operation of the multi-terminal HVDC transmission system is examined through simulations using MATLAB®-SIMULINK®.","PeriodicalId":446482,"journal":{"name":"2015 50th International Universities Power Engineering Conference (UPEC)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132704684","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
A novel approach for energy balanced operation of submodules in multilevel VSC HVDC systems 多级VSC高压直流系统中子模块能量平衡运行的新方法
2015 50th International Universities Power Engineering Conference (UPEC) Pub Date : 2015-12-03 DOI: 10.1109/UPEC.2015.7339898
M. Lehmann, C. Hahn, M. Luther
{"title":"A novel approach for energy balanced operation of submodules in multilevel VSC HVDC systems","authors":"M. Lehmann, C. Hahn, M. Luther","doi":"10.1109/UPEC.2015.7339898","DOIUrl":"https://doi.org/10.1109/UPEC.2015.7339898","url":null,"abstract":"The analysis of the characteristics of the operating behavior and functionality is essential to understand the MMC (modular multilevel converter) topology. Along with the basics of the operation mode the analysis of the stationary operation is the main interest. The operating performance is characterized by the switching events in order to balance the capacitor voltages. The balancing operations are based on the energy stored in the submodule capacitors. To reproduce the reference signal (sinusoidal signal) with a loss optimized switching frequency an adjustment of the balancing operations is necessary. In this paper different submodule drive methods were analyzed. Along with the classic drive methods (PWM) a new approach - the so called dynamic charge allocation (DCA) - was developed. In contrast to the PWM drive method the DCA drive method supplies a stable converter operation for low switching frequencies. As a result it is possible to calculate every capacitor voltage within the MMC converter. The DCA method allows a stable converter operation for low converter switching frequencies due to the developed predictive switching necessity function. Based on the capacitor voltages it is possible to define the necessity of energy balancing mechanisms which will be an indicator of the converter stability for each different drive method. It is shown that for stationary operation no dynamic energy balancing mechanisms are necessary using PWM or DCA drive methods.","PeriodicalId":446482,"journal":{"name":"2015 50th International Universities Power Engineering Conference (UPEC)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123263276","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
Long-term study of partial discharge and gassing behavior of alternative insulating oils for oil gaps 油隙替代绝缘油的局部放电和气体行为的长期研究
2015 50th International Universities Power Engineering Conference (UPEC) Pub Date : 2015-12-03 DOI: 10.1109/UPEC.2015.7339915
Patrick Rumpelt, R. Fritsche, B. Bakija, F. Jenau
{"title":"Long-term study of partial discharge and gassing behavior of alternative insulating oils for oil gaps","authors":"Patrick Rumpelt, R. Fritsche, B. Bakija, F. Jenau","doi":"10.1109/UPEC.2015.7339915","DOIUrl":"https://doi.org/10.1109/UPEC.2015.7339915","url":null,"abstract":"The paper describes the gassing behavior of alternative insulating oils in exposure to partial discharges. Mineral and ester-based oils were applied with partial discharge over a long-term period. The ambition is to verify, how far the mineral oil experience can also be applied to ester-based insulating oils. For this purpose, it is important to recognize the gassing behavior and additionally the dielectric strength- and loss factor- behavior of alternative insulating oils.","PeriodicalId":446482,"journal":{"name":"2015 50th International Universities Power Engineering Conference (UPEC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125095376","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: 4
Digital energy networks: A post occupancy evaluation and appraisal of an Intelligent Low Energy Lighting System 数字能源网络:智能低能耗照明系统的使用后评估与评价
2015 50th International Universities Power Engineering Conference (UPEC) Pub Date : 2015-12-03 DOI: 10.21427/D7PR5W
Anthony Colohan, Joseph Teehan, K. Sunderland, M. Barrett, Jimmy Preston
{"title":"Digital energy networks: A post occupancy evaluation and appraisal of an Intelligent Low Energy Lighting System","authors":"Anthony Colohan, Joseph Teehan, K. Sunderland, M. Barrett, Jimmy Preston","doi":"10.21427/D7PR5W","DOIUrl":"https://doi.org/10.21427/D7PR5W","url":null,"abstract":"The reduction in the electrical power requirements of LED lighting and the coinciding advancements in digital technology have now enabled luminaires to be powered and controlled exclusively over safety extra low voltage (SELV) wiring systems. The implementation of LED luminaires powered via a centralised 48 Volt DC low-latency communication network, with the capability to gather real-time data, has provided the potential to yield considerable electrical energy savings within a building. This paper will present an appraisal of this technology and will examine the technologies potential to make electrical energy savings, improve the quality of lighting and achieve cost savings on an electrical distribution system within a building environment. The intelligent low voltage lighting system was tested in a controlled environment and the energy reduction methods employed in an existing installation over one year provided a further reduction in energy consumption compared to the system's original settings. Furthermore, the ability of the system to enhance the buildings intelligence, in terms of monitoring space utilisation, traffic patterns and temperature.","PeriodicalId":446482,"journal":{"name":"2015 50th International Universities Power Engineering Conference (UPEC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122281754","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
Modelling and sensitivity analyses of equivalent models of low voltage distribution grids with high penetration of distributed generation 分布式发电高渗透低压配电网等效模型建模及灵敏度分析
2015 50th International Universities Power Engineering Conference (UPEC) Pub Date : 2015-12-03 DOI: 10.1109/UPEC.2015.7339942
Philipp Erlinghagen, Tilman Wippenbeck, A. Schnettler
{"title":"Modelling and sensitivity analyses of equivalent models of low voltage distribution grids with high penetration of distributed generation","authors":"Philipp Erlinghagen, Tilman Wippenbeck, A. Schnettler","doi":"10.1109/UPEC.2015.7339942","DOIUrl":"https://doi.org/10.1109/UPEC.2015.7339942","url":null,"abstract":"This paper addresses the fault current contribution of low voltage (LV) grids with high penetration of distributed generation (DG) to large disturbances in overlaying transmission networks. In order to be able to analyse the impact of active distribution networks (ADNs) within a reasonable computational time, equivalent models need to be developed. Within this paper black box models of LV grids are proposed using methods of nonlinear system identification. The large variety of LV grids with regard to different grid topologies, r/x-ratios and DG penetration levels can be analysed in parameter studies using methods of sensitivity analysis. With the help of the results a limitation of the parameter space shall be achieved in order to reduce the total number of equivalent models that need to be included in future stability studies with strong contribution of ADNs.","PeriodicalId":446482,"journal":{"name":"2015 50th International Universities Power Engineering Conference (UPEC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115291898","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
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