2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies最新文献

{"title":"Annual electricity consumption forecasting with least squares support vector machines","authors":"Y. Wang, Songqing Yu","doi":"10.1109/DRPT.2008.4523499","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523499","url":null,"abstract":"In the electricity market, electricity consumption reflects the electric power usage of the whole society. As an important part of load forecasting, annual electricity consumption forecasting plays an important role for all the market participants, especially for the decision-makers establishing bidding strategies of generation companies and the planners of market investors. In this paper, factor selection on the inputs of electricity consumption forecasting is first performed to find proper features from the data in terms of their statistical information. After that, the regression LS-SVM is generalized for the forecasting modeling in this work that is built using the data after factor analysis. In this way, electricity consumption forecasting is accomplished, which not only overcomes the over-fitting of traditional forecasting methods, but also quickens the computation velocity of standard SVM by converting the quadratic optimization problem into the computation of the linear equations. In the end, the case studies are carried out to test the proposed model, which indicates that the built model is an accurate and quick method to predict the electricity consumption.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124343474","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}

{"title":"Development and application of insulation coordination program for UHVDC converter stations","authors":"W. Pan, Xun Liu, D. Nie","doi":"10.1109/DRPT.2008.4523787","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523787","url":null,"abstract":"This paper offers a program to improve the efficiency and accuracy of insulation coordination calculation for UHVDC converter stations. The program is based on the VBA of Excel. It has the functions of selecting arresters scheme, modifying and saving the parameters, inquiring about and adding the arrester characteristics curves and so on. It is applied to calculate the insulation coordination levels in the Xiangjiaba-Shanghai UHVDC system. The program is proved to be accurate, fast, and convenient, and can be applied well for UHVDC converter stations.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124084724","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}

{"title":"The detection and location of power quality disturbances based on orthogonal wavelet packet transform","authors":"Liyan Liu, Zhezhao Zeng","doi":"10.1109/DRPT.2008.4523704","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523704","url":null,"abstract":"A novel method of power quality detection and location using orthogonal wavelet packet transform was proposed. First the theories of orthogonal wavelet packet transform and wavelet basis function choice were discussed; second power quality disturbances with white Gaussian noise in power frequency were simulated; then, a soft-threshold method based on the concept of universal threshold and Stein unbiased risk threshold was given for solving the problem of de-noising in actual signal detection; finally power quality disturbances were detected and localized using orthogonal wavelet packet transform. The results show that the method proposed has a better detection performance; it has more accurate detection and location of the occurrence time and duration of transient. The method is suitable for detection of the transient and processing other non-time- varying signal.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"455 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127612035","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}

{"title":"The research of wind power optimized capacity configuration in hydraulic power system","authors":"Fengqiao Li, Qin Chao, Xun-jiang Dai","doi":"10.1109/DRPT.2008.4523844","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523844","url":null,"abstract":"Buerjin power grid of Xinjiang province in China is an alone hydraulic-wind power mutual compensation system, which is composed of two hydraulic generators with capacity of 2000 KW and one with 2500 KW and seven wind generators with capacity of 150 KW, the wind power capacity account for almost 13.0 percent of total power system capacity. In order to study the optimal capacity scheme of wind power in the system, based on Buerjin real power grid topology, its simplified mathematical model was built by the methods of eliminating partial nodes of the whole power network and of removing power loss and merging into power load. The mathematical model of seven order differential equation for wind power generator considering variable wind speed is given in this paper, the emulation models for the synchronous wind generator with excitation system and frequency-modulation system and the asynchronous wind generator accompanying wind speed variation are built as well. The dynamic stability of wind-hydraulic power mutual compensation system were simulated and analyzed in these cases: wind generators cut-in one by one, wind generators cut-in simultaneously, wind generators cut-in when wind speed leaps. The simulation result is indicated as follow: the power system will be dynamic stable when generators cut-in one by one; the power system dynamic stability will be influenced a little when wind speed leaps from 10 m/s to 20 m/s; the power system frequency will fluctuate between 49 Hz to 52 Hz when seven generators cut-in simultaneously, finally all the generators will be cut off by its control system thus wind power cut-in will be failed. Furthermore, the simulation result also shown that the power system frequency could not be ignored when large-scale wind generators are switched into power grid, frequency should be paid more attention to do research on power system stability. The simulation result also fit the real measurement very well, which verify the correctness of the emulation model. The optimized mathematical model based on genetic algorithm was built in the paper, and the fitness function with punish item was created, so the genetic algorithm was utilized to calculate optimal wind power capacity, the calculation result demonstrated that when the wind penetration capacity exceed 15.25 percent of its rated wind capacity, which reaching its maximum limit, the stability of alone wind-hydraulic mutual compensation system would be destroyed, the conclusion also match its simulation result, which verify the rationality of mathematical model and the feasibility of genetic algorithm application on the calculation of the wind penetration power. In addition, the simulation result also show that the wind generators need to install VAr compensation capacitor with certain of capacity, and the simulation model need to be further improved.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127763672","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}

{"title":"Application of integrated weight method and support vector machine in the comprehensive evaluation of power quality","authors":"Xiaohua Zhang, Xingying Chen, Haoming Liu, Bo Zhao","doi":"10.1109/DRPT.2008.4523772","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523772","url":null,"abstract":"In this paper, a novel comprehensive strategy, consisting of an integrated weight method and support vector machine (SVM) method, is proposed to evaluate power quality. In integrated weight method, analysis hierarchy process (AHP) is employed to determine the subjective weights, and improved scatter degree (ISD) is employed to determine the objective weights, then the comprehensive weights could be fixed based on addition principle. Since SVM could deal with small samples and nonlinear problems effectively, it is introduced into the comprehensive evaluation of power quality. Test results show that the proposed strategy is feasible to PQ evaluation problems. At the same time it can obtain reasonable evaluation results quickly. The obtained model has so good generalization performance that it is fit for large practical samples.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126399422","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}

{"title":"Control algorithm research on seamless transfer for distributed resource with a LCL filter","authors":"Shengli Huang, Li Kong, Haiping Xu","doi":"10.1109/DRPT.2008.4523888","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523888","url":null,"abstract":"Generally distributed resource (DR) with LCL-based grid inverter works as controlled current source in grid-connected mode, while operates in controlled voltage source in island. So in case of utility faults or intentional islanding, DR has to change its control strategy from controlled current source to controlled voltage source. This paper analyzes the transition between controlled current source and controlled voltage source on single-phase inverter and three-phase inverter, respectively, and then presents a novel control strategy based on controlled voltage mode whether connected to the grid or in stand-alone. Once the grid failure, this control strategy regulates the inverter output voltage amplitude quickly, which forces the grid currents through the SCR switches to decrease to zero at much less time and during this SCRs turn-off period, the voltage fluctuates within permissible levels. After disconnection from the grid, the inverter will recover its voltage amplitude to a rated level. The algorithm is discussed in this paper detailedly. Computer simulation and experiments proved the feasibility of this control scheme.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126407464","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}

{"title":"Application of superconducting magnetic energy storage unit to damp power system low frequency oscillations","authors":"L. Cui, Dahu Li, J. Wen, Zhenhua Jiang, Shijie Cheng","doi":"10.1109/DRPT.2008.4523785","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523785","url":null,"abstract":"The objective of this paper is to theoretically investigate the application of superconducting magnetic energy storage (SMES) system in damping power system low-frequency electromechanical oscillations. In the paper, the SMES system is studied in the context of a single-machine infinite-bus (SMIB) power system. The mathematical model of the SMIB power system including a SMES unit is established, and the Phillips-Heffron control structure of the power system is described. Based on the principle of the complex torque coefficient (CTC) method, the expression of the complex electromagnetic torque of the entire power system including the SMES unit is derived. A nonlinear proportion-integral-differential (PID) control strategy is proposed for the SMES system to enhance the power system damping. Simulation results demonstrate that the SMES is effective in damping the power system low-frequency oscillations and the proposed nonlinear PID controller is robust to regulate the SMES unit.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128129003","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}

{"title":"An optimal reactive power planning strategy for enhancement of interface power flow margin","authors":"Qiu Fei, Shu Hong Chun","doi":"10.1109/DRPT.2008.4523749","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523749","url":null,"abstract":"This paper introduce a method of enlarging power transfer capability of electric power corridor connecting to different regions by means of compensation. Different from traditional way to consider voltage stability condition, this paper focus on the influence caused by power transferred in corridor, and this make developing new tool of analysis necessary. A new modified continuous power flow calculation method is developed in this paper, sensitivities of voltage to power transferred is used to determine the site of Var compensation and optimal algorithm of predictor corrector Interior point method is employed to optimize total injection of reactive power in selected weak buses.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125842141","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}

{"title":"Analytical study on electromechanical wave propagation in a non-uniform continuum power system","authors":"Delin Wang, Xiaoru Wang","doi":"10.1109/DRPT.2008.4523545","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523545","url":null,"abstract":"According to the differential equations set of describing electromechanical wave propagation in a general lossless non-uniform continuum, firstly, while both the per unit length susceptance and the rotor's inertia of non-uniform continuum change in the form of power functions of spatial coordinate, this paper obtains the Lommel equation about electromechanical wave propagation, presents the exact solutions expressed by Bessel functions. Then the characteristic impedance and the wave speed expressions of electromechanical wave propagation are also derived in the non-uniform condition. Secondly, the WKBJ approximate analytical solutions are studied while the per unit length susceptance and the rotor's inertia of the non-uniform continuum are slow-variation functions of spatial coordinate. Finally, based on an example with typical parameters, the result of electromechanical wave propagation in a non-uniform continuum power system validate the rationality and correctness of the conclusions presented in this paper.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121975566","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}

{"title":"Multiobjective planning of open-loop mv distribution networks using ComGIS network analysis and MOGA","authors":"K. Tao, Cheng Haozhong, Hu Zechun, Wang Chun, Huang Wei, Chen Chunqin, Gao Yubo","doi":"10.1109/DRPT.2008.4523614","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523614","url":null,"abstract":"In this paper, an advanced method for the planning of open-loop medium voltage (MV) distribution network is proposed. The multiobjective planning model is constructed, and a special multiobjective genetic algorithm (MOGA) is designed based on the network dataset built by component geographical information systems (ComGIS). The network analysis function of the ComGIS is embedded in the overall optimization process to find single-loop optimal paths. Crossover and mutation operator are designed according to characteristics of the coding. The evolutionary orientation is directed by the fitness function based on Pareto order of individuals. The Pareto optimal set (POS) including several candidate planning schemes is gotten through MOGA, from which the recommended scheme is selected. The method has been applied to real life power distribution networks, showing its potential in practical applications.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121442621","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}