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Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)最新文献

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Modeling and analysis of three-phase four-wire distribution transformers with mid-tap on the secondary side 二次侧中分接三相四线制配电变压器的建模与分析
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.702788
Tsai-Hsiang Chen, Wen-chih Yang
{"title":"Modeling and analysis of three-phase four-wire distribution transformers with mid-tap on the secondary side","authors":"Tsai-Hsiang Chen, Wen-chih Yang","doi":"10.1109/EMPD.1998.702788","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702788","url":null,"abstract":"In this paper, three-phase four-wire power distribution transformers with a grounded mid-tap on the secondary side are modeled in phase coordinates. These kinds of distribution transformers are commonly used in distribution systems to supply single-phase lighting loads and three-phase power appliances simultaneously. Using the proposed models, along with appropriate three-phase power flow programs, the inherent characteristics of distribution transformers can be retrieved correctly. The major considerations involve copper loss, core losses, phase angular displacement between primary and secondary voltages and off-nominal tapping of the transformers. Based on the proposed models, three distribution transformers with unbalanced loads are analyzed in detail in this paper. The simulation results show that the proposed models can accurately emulate the performance of a physical distribution transformer in a distribution system even under unbalanced conditions.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128294911","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
The measurement of impulse grounding resistance and inductance of grounding network 接地网冲击接地电阻和电感的测量
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705551
Chen Yunping, Zhai Xiaoming, Zhao Lei
{"title":"The measurement of impulse grounding resistance and inductance of grounding network","authors":"Chen Yunping, Zhai Xiaoming, Zhao Lei","doi":"10.1109/EMPD.1998.705551","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705551","url":null,"abstract":"It is well known that accurate measurement of grounding resistance and inductance under impulse voltage is of great importance for safe operation of electrical and electronic equipment. It is the behavior of grounding objects under impulse voltage instead under DC voltage that determine the safe operation of equipment. However, the existing method and equipment cannot meet the requirement. A new method to realize accurate measurement of grounding impedance and a device, which can produce adjustable wave form of impulse voltage with enough power, can automatically measure and calculate the grounding resistance and inductance, is presented in the paper. The measurement principles, hardware structure and numerical method are described, then the results of experimental results and field measurement results are presented. From these results, we can see that the principle proposed in the paper is correct, the device can meet the requirement of practical measurement, can be used in practical measurement of grounding parameters, which is useful for safe operation of equipment and for economical construction of grounding net.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130536881","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
Improved operation of differential protection of power transformers for internal faults based on negative sequence power 基于负序电源的电力变压器内部故障差动保护的改进操作
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.702605
K. Tian, Pei Liu
{"title":"Improved operation of differential protection of power transformers for internal faults based on negative sequence power","authors":"K. Tian, Pei Liu","doi":"10.1109/EMPD.1998.702605","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702605","url":null,"abstract":"There is a possible of nonoperation for internal faults of second harmonic restraint differential protection of transformers of power systems. Based on Fourier analysis, a new scheme of second harmonic restraint canceled by change of the negative sequence power is proposed in this paper. It can improve the protection functions.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126749607","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: 18
Damping improvement of an AC-DC interconnected system using a fuzzy logic coordinated modulation controller 用模糊逻辑协调调制控制器改进交直流互联系统的阻尼
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.702578
Hjc Peiris, U. Annakkage, N. Pahalawaththa
{"title":"Damping improvement of an AC-DC interconnected system using a fuzzy logic coordinated modulation controller","authors":"Hjc Peiris, U. Annakkage, N. Pahalawaththa","doi":"10.1109/EMPD.1998.702578","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702578","url":null,"abstract":"Design of a fuzzy logic controller does not need an accurate model of the system. Qualitative knowledge about the system behaviour is adequate for designing the controller. This paper presents a fuzzy logic coordinated modulation controller for improving the damping of electromechanical oscillations of an AC-DC power system that consists of an HVDC scheme embedded in an interconnected four-area AC power system. The proposed controller coordinates the modulation of current in the DC link and generator excitation in the rectifier side AC system, in response to the frequency difference between the two ends of the DC line and DC current deviation. Simulation results revealed that a fuzzy logic coordinated modulation controller can be successfully implemented to improve the damping of electromechanical oscillations in an interconnected power system.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"30 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123794478","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
Chaotic motion and diffusion in a power system 电力系统中的混沌运动和扩散
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705546
K. L. Lo, T. Zhu
{"title":"Chaotic motion and diffusion in a power system","authors":"K. L. Lo, T. Zhu","doi":"10.1109/EMPD.1998.705546","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705546","url":null,"abstract":"This paper describes for the first time the chaotic motion and diffusion for an example multi-machine power system using Hamiltonian formation. The existence of chaotic motion under some conditions is confirmed by the calculation of maximum Lyapunov exponents. It is revealed numerically that the random-like motion of Arnold diffusion can carry the system state arbitrarily close to any region of the phase space consistent with energy conservation while the ordinary chaos is only inhabited in a specific region of the whole phase space. A brief analysis of the reason for diffusion is also included.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123940405","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
Analysis of sheath transients in specially bonded cable systems using EMTP 用EMTP法分析特殊粘结电缆护套瞬变
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.702773
A. Trageser, L. Lai, R. Yokoyama
{"title":"Analysis of sheath transients in specially bonded cable systems using EMTP","authors":"A. Trageser, L. Lai, R. Yokoyama","doi":"10.1109/EMPD.1998.702773","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702773","url":null,"abstract":"There are many underground cables in electricity transmission and distribution systems. Utilities have to maintain these cables usually at great cost in order to minimise disruption in services due to cable failures. In extreme cases, the cable systems have to be pulled down to check for defects in cable sections and any wear and tear in the cable protection and sheaths. The prohibitive costs of such preventative maintenance procedures has led to the search for alternative means where the costs involved are not quite as high. One option being considered is a monitoring system that can warn on possible failures so that local maintenance action can be taken. Before such a system can be put in place, extensive simulations are required on the practical system to build up a knowledge base of no fault and faulted conditions that can be used by the monitoring system. This paper presents an approach to the analysis of transients in cable sheaths using EMTP. The results show a high potential to develop a monitoring system.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114868522","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
The application of wavelet theory in analysis and compensation of harmonics in power systems 小波理论在电力系统谐波分析与补偿中的应用
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705398
Ma Ning, Chen Yunping
{"title":"The application of wavelet theory in analysis and compensation of harmonics in power systems","authors":"Ma Ning, Chen Yunping","doi":"10.1109/EMPD.1998.705398","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705398","url":null,"abstract":"A novel approach to visualise singular signals in faulted power systems is proposed. The wavelet transformation technique is applied to help monitor singular signals in the time dimension. Using the proposed scheme, singular signals in faulted power systems can be closely observed. The proposed method has been tested for the inspection of singular signals in faulted DC power systems and of the arc signals in grounding faults. The results demonstrate the merits of the proposed method for application.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125807240","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 variable amplitude multilevel voltage source inverter used for transient power dip compensation 一种用于暂态功率倾斜补偿的可变幅度多电平电压源逆变器
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.702833
F. Huang, P.I. Lim, E.K. Goh
{"title":"A variable amplitude multilevel voltage source inverter used for transient power dip compensation","authors":"F. Huang, P.I. Lim, E.K. Goh","doi":"10.1109/EMPD.1998.702833","DOIUrl":"https://doi.org/10.1109/EMPD.1998.702833","url":null,"abstract":"Multilevel voltage source inverters have been considered as being suitable for high voltage, high power applications. Typical applications can be found in static VAr generation, power line conditioning, and voltage balancing. Multilevel voltage source inverters consist of many single-phase inverters. Charged capacitors may be used as DC input voltage sources. In most cases, the single-phase inverters are treated as identical. This paper presents the design and implementation of a variable amplitude multilevel voltage source inverter. In this inverter, capacitors used as input DC voltage sources are charged at different voltage levels according to pre-designed values. Several approaches in searching the optimal levels are investigated. A near optimal scheme is studied. It is found that the near optimal pattern has almost the same level of harmonics distortion as the optimal one. The near optimal scheme is implemented using a TMS 320C50 DSP card. Some experimental results are compared with simulated data. The two results are in agreement.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121708099","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
A new topology of a battery energy storage system 一种新的电池储能系统拓扑结构
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705521
K. Leung, D. Sutanto
{"title":"A new topology of a battery energy storage system","authors":"K. Leung, D. Sutanto","doi":"10.1109/EMPD.1998.705521","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705521","url":null,"abstract":"This paper describes a new topology of a battery energy storage system (BESS) that can provide simultaneously fast control of both its MW and MVAr outputs to improve power system operation and control. The proposed BESS topology also provides several other important contributions to the power systems such as active harmonic filtering to meet power quality standards, load leveling, damping of inter-area oscillations, damping of transient stability, effective and fast control of power flow along a transmission line corridor, many of the flexible AC transmission system (FACTS) features, and emergency supply on loss of AC source (very similar to UPS applications). This paper shows that BESS can offer an important resource for improving power system control.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130189773","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: 8
Gauss-Markov models for forecasting and risk evaluation 用于预测和风险评估的高斯-马尔可夫模型
Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI: 10.1109/EMPD.1998.705539
Y. K. Wong, A. Rad
{"title":"Gauss-Markov models for forecasting and risk evaluation","authors":"Y. K. Wong, A. Rad","doi":"10.1109/EMPD.1998.705539","DOIUrl":"https://doi.org/10.1109/EMPD.1998.705539","url":null,"abstract":"In power systems, expansion of generating and transmission facilities, day-to-day operation are dependent on the future loading demands. Load uncertainty can be modeled using the Gauss-Markov properties for a random process. Sharing the Gauss-Markov characteristics, Box-Jenkins (ARIMA) forecast procedure is described. Then, electricity consumption data is simulated as an application of ARIMA models. Finally, a risk evaluation study using a Gauss-Markov load model is also demonstrated.","PeriodicalId":434526,"journal":{"name":"Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130820023","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
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