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A methodology for power quality evaluation in distribution network with distributed generation 分布式发电配电网电能质量评价方法
2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI: 10.1109/CRIS.2010.5617538
Gengyin Li, Zhe Zhang, Xiang Li, Song Wang, Ming Zhou
{"title":"A methodology for power quality evaluation in distribution network with distributed generation","authors":"Gengyin Li, Zhe Zhang, Xiang Li, Song Wang, Ming Zhou","doi":"10.1109/CRIS.2010.5617538","DOIUrl":"https://doi.org/10.1109/CRIS.2010.5617538","url":null,"abstract":"The issue of power quality in the distribution system is always in sense of the concern. With the high penetration of distributed generation (DG) currently, it tends to be more complicated. This paper presents a new approach to evaluate impacts of the DG on power quality of the distribution network. In the process an objective function will be modeled, which will be solved by the optimization toolbox, in order to calculate the result for the evaluating grade. Furthermore, the results of the overall evaluation will be given via the eigenvalue weighted method. The power quality ranking of each feeder with the distributed generators in the distribution network will be apparent with the given weight of influence caused by DGs divided in forms of energy resource.","PeriodicalId":206094,"journal":{"name":"2010 5th International Conference on Critical Infrastructure (CRIS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125502891","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
A novel assessment method for harmonic environment in Microgrid 一种新的微电网谐波环境评价方法
2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI: 10.1109/CRIS.2010.5617493
Xin Ai, Z. Lei, Mingyong Cui
{"title":"A novel assessment method for harmonic environment in Microgrid","authors":"Xin Ai, Z. Lei, Mingyong Cui","doi":"10.1109/CRIS.2010.5617493","DOIUrl":"https://doi.org/10.1109/CRIS.2010.5617493","url":null,"abstract":"As one of the fundamental structures in Smartgrid concept, Microgrid has critical effort on maintaining user's power quality and efficiency therefore reduce energy consumption and carbon emission. Harmonic environment of an electric network means the characteristic of distribution of the harmonic energy, voltage and current, in the network. Harmonic environment of Microgrid is complicated due to nonlinear equipments, e.g. thyristor based power converter. The nonlinear equipments are both harmonic source and harmonic vulnerable, so that the assessment of Microgrid harmonic environment is very necessary for programming construction and operation of Microgrid. The modal analysis is able to figure out the paths harmonic spread and element effecting spread, but the method can not deal with nonlinear equipments properly, even those equipments are playing main role in harmonic problem in Microgrid. In this paper a maturity nonlinear equipment model is introduced in modal analysis for fully Microgrid harmonic assessment. According to the assessment results, proper measures can be taken place to improve the construction and operation of Microgrid. The method proposed in this paper has been approved to be rational and effective by the simulation test results.","PeriodicalId":206094,"journal":{"name":"2010 5th International Conference on Critical Infrastructure (CRIS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121543255","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
Key management for advanced power distribution system using EPON 基于EPON的先进配电系统密钥管理
2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI: 10.1109/CRIS.2010.5617530
Zhongwei Sun, H. Zhang, Jing Ma
{"title":"Key management for advanced power distribution system using EPON","authors":"Zhongwei Sun, H. Zhang, Jing Ma","doi":"10.1109/CRIS.2010.5617530","DOIUrl":"https://doi.org/10.1109/CRIS.2010.5617530","url":null,"abstract":"Advanced distribution operation is an increasingly important function for smart grid, and a reliable communication network constitutes the core of the advanced distribution automation system. Ethernet Passive Optical Network (EPON) is regarded as a promising fiber-based communication technique for advanced distribution automation because it is not only high-speed, cost-effective but also scalable. However, EPON has very specific security requirements, due to its broadcasting character of transmission medium in the downstream direction. Group key management plays an essential role for the guarantee of data confidentiality and integrity. This paper proposes to encrypt the broadcasting information transmitted in the EPON using the encryption key. To reduce the size of rekeying messages and achieve the sufficient scalability, a hybrid key management model is presented, where a Logical Key Hierarchy (LKH) with decentralized architecture is employed.","PeriodicalId":206094,"journal":{"name":"2010 5th International Conference on Critical Infrastructure (CRIS)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126509879","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
An improved channel estimation algorithm of TD-SCDMA system 一种改进的TD-SCDMA系统信道估计算法
2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI: 10.1109/CRIS.2010.5617566
J. Hou, Liangrui Tang
{"title":"An improved channel estimation algorithm of TD-SCDMA system","authors":"J. Hou, Liangrui Tang","doi":"10.1109/CRIS.2010.5617566","DOIUrl":"https://doi.org/10.1109/CRIS.2010.5617566","url":null,"abstract":"B.Steiner channel estimation algorithm is generally adopted in TD-SCDMA system. However, because of the impact of background noise, there are some errors between the estimated channel impulses responses (CIRs) and the real ones in terms of amplitude and time-delay, leading to the system performance decreases. This paper proposed a gate method which processes the result of the B.Steiner estimation algorithm and thus decreases noises. The simulation results show that the improved CIRs are closer to the ideal ones and the system performance is effectively increased. Besides, this method is easily to be realized without adding any extra computations of system.","PeriodicalId":206094,"journal":{"name":"2010 5th International Conference on Critical Infrastructure (CRIS)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126606791","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
Analysis and comparison of resonance grounding with low resistance grounding 谐振接地与低阻接地的分析与比较
2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI: 10.1109/CRIS.2010.5617517
Lei Li, Lixiao Duan, J. Zhou, Jian Zhang, Wenzhong Zhou, Bo Li
{"title":"Analysis and comparison of resonance grounding with low resistance grounding","authors":"Lei Li, Lixiao Duan, J. Zhou, Jian Zhang, Wenzhong Zhou, Bo Li","doi":"10.1109/CRIS.2010.5617517","DOIUrl":"https://doi.org/10.1109/CRIS.2010.5617517","url":null,"abstract":"The scale of medium voltage networks have been expanding and cables are increasingly used so that nowadays capacitance currents are much greater than before when single line-to-ground faults happen. And the harm of an arcing ground overvoltage is extremely severe in an ungrounded system. To solve the problem put forward, the neutral of a medium voltage network is grounded with petersen coils or low resistance. This article compares the two grounding modes technically. Varieties of operation characters and parameters are researched in the two different grounding systems. Besides, interference to communication is taken into account. Reliability of power supply, security and economy of power grids are discussed. And reference suggestions are proposed for operations of distribution network.","PeriodicalId":206094,"journal":{"name":"2010 5th International Conference on Critical Infrastructure (CRIS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128376249","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
Parameters optimization of HVDC control system based on Simplex Algorithm in RTDS RTDS中基于单纯形算法的高压直流控制系统参数优化
2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI: 10.1109/CRIS.2010.5617529
Z.W. Jia, Chengyong Zhao
{"title":"Parameters optimization of HVDC control system based on Simplex Algorithm in RTDS","authors":"Z.W. Jia, Chengyong Zhao","doi":"10.1109/CRIS.2010.5617529","DOIUrl":"https://doi.org/10.1109/CRIS.2010.5617529","url":null,"abstract":"The performance of HVDC system depends on the parameters of control system, and usually PI controllers have been used to adjust system to fulfill desired objectives. However, the optimization methods for PI controllers' parameters of HVDC system are very few up to now. And when the optimization task comes to RTDS, it becomes more complex. This paper introduces the Simplex Algorithm and its application in real time simulation (RTDS). The system objective functions are adopted to optimize the PI parameters of constant current (CC) control at the rectifier and the extinction-angle control at the inverter for Three Gorges-Shanghai ±500 kV DC Transmission Project on the basis of the control strategy. After the optimization process was finished, the performance of the PI controller with the optimized parameters was compared with that of the PI controller with the initial parameters. The step responses of those two PI controllers were presented by figures. And it shows that the controller with the optimized parameters has strong robustness.","PeriodicalId":206094,"journal":{"name":"2010 5th International Conference on Critical Infrastructure (CRIS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127346935","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
The influence of the distributed trapped charge on VFTO 分布俘获电荷对VFTO的影响
2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI: 10.1109/CRIS.2010.5617488
Hongyang Yu, B. Lu
{"title":"The influence of the distributed trapped charge on VFTO","authors":"Hongyang Yu, B. Lu","doi":"10.1109/CRIS.2010.5617488","DOIUrl":"https://doi.org/10.1109/CRIS.2010.5617488","url":null,"abstract":"In this paper, the nodal admittance equation is derived for analyzing the response of the transmission line under the residual voltage due to uniformly distributed charge along the line in Laplace domain. We equivalent the trapped charge to the current sources which are located at near-end and far-end when the disconnector switching is operated. Based on the Numerical Inverse Laplace Transform method, the response of the transmission line is solved. And the simulation results are compared with the simulations in EMTP to confirm that the formulation is correct. Based on the equation presented in this paper, several simulations have been studied. We simulate the effect of trapped charge with different magnitude on VFTO, and the effect of length of line on VFTO.","PeriodicalId":206094,"journal":{"name":"2010 5th International Conference on Critical Infrastructure (CRIS)","volume":"354 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131777050","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
Compound control algorithm based on a novel topology of current compensation apparatus 基于新型电流补偿装置拓扑结构的复合控制算法
2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI: 10.1109/CRIS.2010.5617499
L. Yukun, Xiao Xiangning, Lei Xiao, Wang Xiangxu, Wang Jin
{"title":"Compound control algorithm based on a novel topology of current compensation apparatus","authors":"L. Yukun, Xiao Xiangning, Lei Xiao, Wang Xiangxu, Wang Jin","doi":"10.1109/CRIS.2010.5617499","DOIUrl":"https://doi.org/10.1109/CRIS.2010.5617499","url":null,"abstract":"This paper theoretically analyzes the compound control apparatus for current quality compensation which is designed as differentiation cascaded H bridge type with two modules: fundamental-frequency module and high-frequency module. The detection algorithm calculates the harmonic current and fundamental-frequency current of the load current which serve as the command current. For the purpose of eliminating the steady periodic error of system and improving the tracking accuracy of the compensation current, PI and repetitive controller in parallel is introduced as a advanced current control method. A detailed analysis and design for the high-frequency module is presented based on frequency characteristic and steady state. A 10kV system simulation model based on PSCAD/EMTDC is built to analyze the control strategy. Finally, the experimental results illustrate that the proposed control strategy is feasible and provide a reference for the 10kV industrial apparatus.","PeriodicalId":206094,"journal":{"name":"2010 5th International Conference on Critical Infrastructure (CRIS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130796940","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
ATC determination for the AC/DC transmission systems using modified CPF method 用改进的CPF方法测定交/直流输电系统的ATC
2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI: 10.1109/CRIS.2010.5617512
Zhongjie Chen, Ming Zhou, Gengyin Li
{"title":"ATC determination for the AC/DC transmission systems using modified CPF method","authors":"Zhongjie Chen, Ming Zhou, Gengyin Li","doi":"10.1109/CRIS.2010.5617512","DOIUrl":"https://doi.org/10.1109/CRIS.2010.5617512","url":null,"abstract":"With the expansion of the power systems, DC power transmission has been increasingly applied in interconnection of grids. The determination of Available Transfer Capability (ATC) for the AC/DC transmission systems is significant to the system planning and operation. So far, most studies have been focused on ATC determination for AC transmission systems, few are on the AC/DC system ATC determination. In this paper, the ATC determination model for the AC/DC systems is proposed. Multi-terminal DC (MTDC) system is considered in ATC computation model. Conventionally, the power injection variations are determined by load variations and generation dispatch, both of them are nonlinear. To model these nonlinear variations, an alternate iterative continuation power flow (CPF) method with multiple load variations and generation economic dispatch patterns is presented to solve the proposed model. The MTDC system configurations, the converter control strategies and the transformer's tap adjustment strategies are incorporated to this modified CPF algorithm. The modified IEEE 30-bus test system is used to verify the presented approach.","PeriodicalId":206094,"journal":{"name":"2010 5th International Conference on Critical Infrastructure (CRIS)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131350349","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
Stability studies of offshore wind farms 海上风电场稳定性研究
2010 5th International Conference on Critical Infrastructure (CRIS) Pub Date : 2010-11-01 DOI: 10.1109/CRIS.2010.5617503
H. Guo, K. Rudion, C. Heyde, Z. Styczynski
{"title":"Stability studies of offshore wind farms","authors":"H. Guo, K. Rudion, C. Heyde, Z. Styczynski","doi":"10.1109/CRIS.2010.5617503","DOIUrl":"https://doi.org/10.1109/CRIS.2010.5617503","url":null,"abstract":"Wind energy is the most important type of renewable energy in Europe. The stability of system network operation with a large penetration of wind energy has become one of the most critical issues in the new structure of power systems with different types of generation. In this paper the HVDC and HVAC connection of the wind farm to grid is compared. The HVDC is more advantageous in maintaining the system stability. Nevertheless this study focuses on the HVAC connection of wind farms with regard to its lower costs and widely practical application. Based on the topology of the offshore wind farm Alpha Ventus, a simulation model is developed in software PSS/NETOMAC. Using this model the steady-state voltage and power factor at the wind farm connection point is analyzed and compared with the grid code requirement on reactive power exchange and voltage stability. The impact of the cable switching on voltage is investigated as well. The simulation results indicate that overvoltage will occur during cable switching if the cable is not sufficiently compensated, and the overvoltage will become more critical with as the operational voltage levels of the cable increases.","PeriodicalId":206094,"journal":{"name":"2010 5th International Conference on Critical Infrastructure (CRIS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115003700","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
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