IEEE/PES Transmission and Distribution Conference and Exhibition最新文献

Database support for condition assessment of distribution power cables 配电电缆状态评估的数据库支持

IEEE/PES Transmission and Distribution Conference and Exhibition Pub Date : 2003-02-19 DOI: 10.1109/TDC.2002.1177631

B. Quak, J. Smit, E. Gulski, F. Wester, E. Groot

引用次数: 0

Automatic generation control for DC-link power system 直流供电系统的自动发电控制

IEEE/PES Transmission and Distribution Conference and Exhibition Pub Date : 2002-12-01 DOI: 10.1109/TDC.2002.1176835

G. Fujita, G. Shirai, R. Yokoyama

{"title":"Automatic generation control for DC-link power system","authors":"G. Fujita, G. Shirai, R. Yokoyama","doi":"10.1109/TDC.2002.1176835","DOIUrl":"https://doi.org/10.1109/TDC.2002.1176835","url":null,"abstract":"This paper discusses LFC (load frequency control) with HVDC (high voltage DC transmission system). So far, AGC (automatic generation control) has been focused on economic dispatch control and load frequency control; especially the latter is mainly on frequency stabilization for AC-link network systems. However, the upcoming power-electronics based HVDC transmission system offers new aspects for the improvement of frequency control. In this paper, 2-area and 3-area network systems are used to discuss how a HVDC interconnected system works to improve frequency fluctuation for random load disturbance. Because DC-interconnection provides an adequate power exchange, reduction of frequency deviations for both systems is achieved if the control gain is tuned properly. However, the effect differs by geometrical differences. In order to discuss the effectiveness of HVDC link for load frequency control, the HVDC-link is designed as a feedback system of system state variables, whose concept has been used for Hokkaido-Honshu link in Japan and also proposed for Minami-Fukumitsus link in Japan. The simulated load fluctuation model is constructed to demonstrate actual load's behavior. In AC-interconnected power systems, the HVDC-link connecting two of the local systems does not provide frequency improvement since power exchange has been already achieved on the links. However, if two isolated power systems are interconnected, the HVDC-link will make the important role to sustain the frequency deviation within regular tolerance even if the capacity is very small compared to those of two systems, these acts as a single system and the disturbance to the smaller system is cancelled as a tiny disturbance of the whole system.","PeriodicalId":289535,"journal":{"name":"IEEE/PES Transmission and Distribution Conference and Exhibition","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117254481","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: 26

Assessment of upgrading existing primary feeders from radial to normally closed loop arrangement 评估将现有主馈线从径向升级为常闭回路布置

IEEE/PES Transmission and Distribution Conference and Exhibition Pub Date : 2002-12-01 DOI: 10.1109/TDC.2002.1177789

W.T. Huang, T. Chen

{"title":"Assessment of upgrading existing primary feeders from radial to normally closed loop arrangement","authors":"W.T. Huang, T. Chen","doi":"10.1109/TDC.2002.1177789","DOIUrl":"https://doi.org/10.1109/TDC.2002.1177789","url":null,"abstract":"The problems that we may face while upgrading primary feeders from radial to normally closed loop arrangement have been explored in this paper. Four existent distribution feeders with original radial arrangement fed by two distribution substations of Taiwan Power Company were utilized as sample feeders to form a normally closed loop with three different types of connection between any two of these radial feeders. The two radial feeders were normally tied together at their ends to form a closed ring. The three different arrangements are the two feeders fed by the same transformer, by distinct transformers in a substation and by distinct transformers located in different substations, respectively. The power flows, voltage profiles and short-circuit capacities of the sample distribution feeders with originally radial arrangement and normally closed loop arrangement were evaluated, and the impacts of the arrangement upgrading were assessed. The outcomes are of value to the distribution engineers to upgrade an existing distribution network with unqualified performance and unable to meet the requirements of its customers in the present day or in the near future.","PeriodicalId":289535,"journal":{"name":"IEEE/PES Transmission and Distribution Conference and Exhibition","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132076098","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: 27

Importance of the consideration of electrical gradient force in the deactivation of free conducting particle under DC voltage 考虑电梯度力在直流电压下自由导电粒子失活中的重要性

IEEE/PES Transmission and Distribution Conference and Exhibition Pub Date : 2002-12-01 DOI: 10.1109/TDC.2002.1177596

Y. Khan, K. Sakai, S. Okabe, J. Suehiro, M. Hara

引用次数: 8

A new scheme of protective system for three-phase transformers 三相变压器保护系统的一种新方案

IEEE/PES Transmission and Distribution Conference and Exhibition Pub Date : 2002-12-01 DOI: 10.1109/TDC.2002.1177730

C.L. Cheng, C.E. Lin

{"title":"A new scheme of protective system for three-phase transformers","authors":"C.L. Cheng, C.E. Lin","doi":"10.1109/TDC.2002.1177730","DOIUrl":"https://doi.org/10.1109/TDC.2002.1177730","url":null,"abstract":"Three-phase transformers are key equipment in power systems and power plants. Security and stability of three-phase transformers are both important and necessary for system operation. When a three-phase transformer is energized, the inrush current due to flux saturation in the core results in a malfunction of the differential relay and also causes a stress impact to the transformer. These have a bad effect on the security and stability of the power system. In this paper, an optimum nonsynchronous switching-on suppressing method of three-phase transformers inrush current is proposed. The proposed method is examined by experiment. It has excellent performance for suppressing three-phase inrush current. It is applied to design the protective system of a three-phase transformer. For the optimum nonsynchronous switching-on suppressing method, a protective system based on a single-chip controller is implemented. The system can distinguish fault current from inrush current. Therefore stress impact and overvoltage resulting from three-phase inrush current can be avoided. The active protection of three-phase transformer is obtained to improve the protective relaying system. Now, problems caused by three-phase inrush current can be detected and solved effectively.","PeriodicalId":289535,"journal":{"name":"IEEE/PES Transmission and Distribution Conference and Exhibition","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116422921","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: 6

Determination of optimal system configuration for Japanese power system model 日本电力系统模型最优系统配置的确定

IEEE/PES Transmission and Distribution Conference and Exhibition Pub Date : 2002-12-01 DOI: 10.1109/TDC.2002.1178289

Y. Hayashi, J. Matsuki

引用次数: 0

Interpretation of the relation between residual charge and water trees in XLPE cables 交联聚乙烯电缆剩余电荷与水树关系的解释

IEEE/PES Transmission and Distribution Conference and Exhibition Pub Date : 2002-12-01 DOI: 10.1109/TDC.2002.1177630

N. Hirai, Y. Ohki, T. Takeda, T. Okamoto

{"title":"Interpretation of the relation between residual charge and water trees in XLPE cables","authors":"N. Hirai, Y. Ohki, T. Takeda, T. Okamoto","doi":"10.1109/TDC.2002.1177630","DOIUrl":"https://doi.org/10.1109/TDC.2002.1177630","url":null,"abstract":"Crosslinked polyethylene (XLPE) insulated cables working in water are known to be easily degraded by forming water trees. This is one of the most serious concerns among users of XLPE cables. The possibility whether measurement of residual charge is usable as a tool to detect water trees in XLPE is discussed. Two types of samples were used; one is an XLPE cable with water trees and the other is an XLPE sheet with water trees grown by AC voltage application. The sheet sample was used since we thought that we could easily check the growth of water trees and could also use a generator of a small capacity, which enabled precise experiments. The results obtained are summarized as follows. (1) Residual charge was not measured in the sheet sample because of its small electrode area. (2) Residual charge was detected in the cable sample. (3) A clear frequency dependence of the residual charge was not observed. A model of the residual charge measurement is proposed, where the charges accumulated in a water tree are oscillated by AC electric field and are diffused through the water tree path with a high conductivity. The frequency dependence of the residual charge is discussed by dividing it into the contribution of the electric field distribution, that of the detrapping process, and that of the carrier transportation process into the electrode. As a result, it is confirmed that the weak frequency dependence of the residual charge is reasonable.","PeriodicalId":289535,"journal":{"name":"IEEE/PES Transmission and Distribution Conference and Exhibition","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128175126","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

Estimation of stochastic characteristics of an AC electric arc furnace 交流电弧炉随机特性的估计

IEEE/PES Transmission and Distribution Conference and Exhibition Pub Date : 2002-12-01 DOI: 10.1109/TDC.2002.1177780

Shyh-Jier Huang, C. Lu

引用次数: 1

An integrated approach for automation of distribution system 配电系统自动化的集成方法

IEEE/PES Transmission and Distribution Conference and Exhibition Pub Date : 2002-10-06 DOI: 10.1109/TDC.2002.1177786

M. Khedkar, V. Gohokar

引用次数: 7

Reliability worth evaluation for distribution system planning and operation using improved actual performance data 利用改进的实际性能数据对配电系统规划和运行进行可靠性评估

IEEE/PES Transmission and Distribution Conference and Exhibition Pub Date : 2002-10-06 DOI: 10.1109/TDC.2002.1178263

B. Eua‐arporn, A. Yokoyama, K. Audomvongseree

{"title":"Reliability worth evaluation for distribution system planning and operation using improved actual performance data","authors":"B. Eua‐arporn, A. Yokoyama, K. Audomvongseree","doi":"10.1109/TDC.2002.1178263","DOIUrl":"https://doi.org/10.1109/TDC.2002.1178263","url":null,"abstract":"It is widely known that in reliability cost/worth analysis, customer outage cost should be taken into account for the delivery of energy services. Several methodologies have been proposed. However, these methods require a lot of long term statistical data e.g. failure and repair rates, which may not be available at present in developing countries. There are some researches considering reliability cost/worth in term of Actual Performance data. Nevertheless, this method can only evaluate the past performance indices according to its past actual performance data. From this reason, it may not be possible to make a reasonable decision in distribution system planning and design. This paper proposes an approach to cope with this problem. The past performance data and the targets of system planning, customer average interruption duration index (CAIDI) and average power not supplied (APNS), will be used to generate the expect interruption events. To handle the uncertainty in setting the system targets, fuzzy concept is then applied. In this paper the proposed method together with Thailand's customer damage model (CCDF), obtained from the study conducted in the years 2000-2001, is employed to evaluate the reliability worth of the distribution system in Thailand.","PeriodicalId":289535,"journal":{"name":"IEEE/PES Transmission and Distribution Conference and Exhibition","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127448815","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