Pub Date : 2006-10-01DOI: 10.1109/ICPST.2006.321956
Whei-Min Lin, Chien-Hsien Wu, Chia-Hung Lin, F. Cheng
This paper presents a classifier for recognizing power quality disturbances (PQD) problem. The so called support vector machine (SVM) is an effective classification tool, but it can only process binary classification problems. This paper integrated SVM and the one-versus-one (OVO) approach to form the OVO-based SVM (OSVM) which can process the multiple classification problem such as PQD. Using the proposed methodology can reduce a great quantity of the training data, less memory space and computing time are required. With IEEE 14-bus power system, seven power quality disturbing events were tested and compared with artificial neural network (ANN). The simulation results were conducted to show the shortened processing time and effectiveness of the proposed approach.
{"title":"Classification of Multiple Power Quality Disturbances Using Support Vector Machine and One-versus-One Approach","authors":"Whei-Min Lin, Chien-Hsien Wu, Chia-Hung Lin, F. Cheng","doi":"10.1109/ICPST.2006.321956","DOIUrl":"https://doi.org/10.1109/ICPST.2006.321956","url":null,"abstract":"This paper presents a classifier for recognizing power quality disturbances (PQD) problem. The so called support vector machine (SVM) is an effective classification tool, but it can only process binary classification problems. This paper integrated SVM and the one-versus-one (OVO) approach to form the OVO-based SVM (OSVM) which can process the multiple classification problem such as PQD. Using the proposed methodology can reduce a great quantity of the training data, less memory space and computing time are required. With IEEE 14-bus power system, seven power quality disturbing events were tested and compared with artificial neural network (ANN). The simulation results were conducted to show the shortened processing time and effectiveness of the proposed approach.","PeriodicalId":181574,"journal":{"name":"2006 International Conference on Power System Technology","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121416913","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}
Pub Date : 2006-10-01DOI: 10.1109/ICPST.2006.321555
P. Si, A. Hu, S. Malpas, D. Budgett
Dynamic detuning methods have been used in inductive contactless power transfer (ICPT) systems for power flow control. However, the highly variable switching frequency involved in the detuning operation will contribute to electromagnetic interference (EMI) and power losses. It is difficult to determine the detuning frequency precisely due to nonlinear features of power pick-ups. Uncertainty in the operating frequency can result in difficulties in designing filters with suitable bandwidths and choosing suitable switching devices. Based on detailed analytical analysis in four segments of the detuning process, a numerical method is developed in this paper to determine the boundaries of the switching frequencies. An iterative algorithm is presented using a flow chart to illustrate the process taken in the numerical analysis. Simulation and practical experiments are conducted to verify the algorithm so as to ensure the calculated results are sufficiently accurate for designing EMI filters and choosing suitable switching devices.
{"title":"Switching Frequency Analysis of Dynamically Detuned ICPT Power Pick-ups","authors":"P. Si, A. Hu, S. Malpas, D. Budgett","doi":"10.1109/ICPST.2006.321555","DOIUrl":"https://doi.org/10.1109/ICPST.2006.321555","url":null,"abstract":"Dynamic detuning methods have been used in inductive contactless power transfer (ICPT) systems for power flow control. However, the highly variable switching frequency involved in the detuning operation will contribute to electromagnetic interference (EMI) and power losses. It is difficult to determine the detuning frequency precisely due to nonlinear features of power pick-ups. Uncertainty in the operating frequency can result in difficulties in designing filters with suitable bandwidths and choosing suitable switching devices. Based on detailed analytical analysis in four segments of the detuning process, a numerical method is developed in this paper to determine the boundaries of the switching frequencies. An iterative algorithm is presented using a flow chart to illustrate the process taken in the numerical analysis. Simulation and practical experiments are conducted to verify the algorithm so as to ensure the calculated results are sufficiently accurate for designing EMI filters and choosing suitable switching devices.","PeriodicalId":181574,"journal":{"name":"2006 International Conference on Power System Technology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114212306","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}
Pub Date : 2006-10-01DOI: 10.1109/ICPST.2006.321482
H. Chen,, B. Sun, J.L. He, X. Dong
Techniques of one ground electrodes shared by two DC transmission systems (which called common ground electrode) are blanks in our country now. In this paper, a common ground electrode used in Yunnan-Guangdong DC transmission system and Guizhou-Guangdong II DC transmission system is presented. The scheme and the effect to the whole DC transmission system of common ground electrode are analyzed in detail. In addition, the corresponding solving method and suggestion of the negative influence to the DC transmission system are given.
{"title":"Analysis on Common Ground Electrode Technology","authors":"H. Chen,, B. Sun, J.L. He, X. Dong","doi":"10.1109/ICPST.2006.321482","DOIUrl":"https://doi.org/10.1109/ICPST.2006.321482","url":null,"abstract":"Techniques of one ground electrodes shared by two DC transmission systems (which called common ground electrode) are blanks in our country now. In this paper, a common ground electrode used in Yunnan-Guangdong DC transmission system and Guizhou-Guangdong II DC transmission system is presented. The scheme and the effect to the whole DC transmission system of common ground electrode are analyzed in detail. In addition, the corresponding solving method and suggestion of the negative influence to the DC transmission system are given.","PeriodicalId":181574,"journal":{"name":"2006 International Conference on Power System Technology","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114531887","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}
Pub Date : 2006-10-01DOI: 10.1109/ICPST.2006.321560
Liu Huayong, Du Shuwei, Shu Yongsheng, Huang Junyi, Zhang Hua
The text introduce the theory and the test result of the determination of distribution transformer's capacity in impedance-voltage compare method, and analyse the new method's excellence in contrast to the traditional test methods of transformer capacity. The impedance-voltage compare method associating with the three element determination method can prevent the fault judgement of distribution transformer's capacity with very high veracity. It has very high actual meaning to the work against stealing and reducing wasting electricity.
{"title":"The application and research of impedance-voltage compare method in the testing of distribution transformer's capacity","authors":"Liu Huayong, Du Shuwei, Shu Yongsheng, Huang Junyi, Zhang Hua","doi":"10.1109/ICPST.2006.321560","DOIUrl":"https://doi.org/10.1109/ICPST.2006.321560","url":null,"abstract":"The text introduce the theory and the test result of the determination of distribution transformer's capacity in impedance-voltage compare method, and analyse the new method's excellence in contrast to the traditional test methods of transformer capacity. The impedance-voltage compare method associating with the three element determination method can prevent the fault judgement of distribution transformer's capacity with very high veracity. It has very high actual meaning to the work against stealing and reducing wasting electricity.","PeriodicalId":181574,"journal":{"name":"2006 International Conference on Power System Technology","volume":"212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116371577","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}
Pub Date : 2006-10-01DOI: 10.1109/ICPST.2006.321735
Cao Lianjun, Wang Wen, Duan Wenjun, Ma Xiao
Electricity market business management system (EMBMS) is a key secondary system in electric power dispatching and trading center, and it is necessary to apply the security defense to EMBMS. According to the regulation of the China Power Grid Company, The network structure and application system of typical EMBMS are analyzed in detail, the security requirements of EMBMS and security menace that the EMBMS is faced with are studied, the system security defence policy for EMBMS, including adopting secure operating system (OS), the security strategies for database, application software, fault-tolerant and disaster recovery, security partitioning, authentication and encryption, and security audit are proposed.
{"title":"Security Analysis and Defense Tactics of Electricity Market Business Management System","authors":"Cao Lianjun, Wang Wen, Duan Wenjun, Ma Xiao","doi":"10.1109/ICPST.2006.321735","DOIUrl":"https://doi.org/10.1109/ICPST.2006.321735","url":null,"abstract":"Electricity market business management system (EMBMS) is a key secondary system in electric power dispatching and trading center, and it is necessary to apply the security defense to EMBMS. According to the regulation of the China Power Grid Company, The network structure and application system of typical EMBMS are analyzed in detail, the security requirements of EMBMS and security menace that the EMBMS is faced with are studied, the system security defence policy for EMBMS, including adopting secure operating system (OS), the security strategies for database, application software, fault-tolerant and disaster recovery, security partitioning, authentication and encryption, and security audit are proposed.","PeriodicalId":181574,"journal":{"name":"2006 International Conference on Power System Technology","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121645463","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}
Pub Date : 2006-10-01DOI: 10.1109/ICPST.2006.321556
J. Hsu, A. Hu, A. Swain, X. Dai, Yue Sun
This paper proposes a new contactless power pickup with a LCL tuning circuit which utilizes the magnetic amplifier as a variable inductor. The tuning circuit of the power pick-up is based on the LCL configuration and provides a simple relationship between the open circuit voltage of the pick-up coil and the output voltage regardless of the load variation. The use of magnetic amplifier as a variable inductor offers significant advantages where the inductance is dynamically varied using a controller and BJT to deliver power under a variety of load conditions. The proposed method can significantly improve the overall performance of the ICPT (inductively coupled power transfer) system by producing continuous waveforms within the system at all times. Simulations based on PLECS (a Simulink toolbox) demonstrate that the new method can successfully control the output voltage resulting in satisfactory steady state performance.
{"title":"A new contactiess power pick-up with continuous variable inductor control using magnetic amplifier","authors":"J. Hsu, A. Hu, A. Swain, X. Dai, Yue Sun","doi":"10.1109/ICPST.2006.321556","DOIUrl":"https://doi.org/10.1109/ICPST.2006.321556","url":null,"abstract":"This paper proposes a new contactless power pickup with a LCL tuning circuit which utilizes the magnetic amplifier as a variable inductor. The tuning circuit of the power pick-up is based on the LCL configuration and provides a simple relationship between the open circuit voltage of the pick-up coil and the output voltage regardless of the load variation. The use of magnetic amplifier as a variable inductor offers significant advantages where the inductance is dynamically varied using a controller and BJT to deliver power under a variety of load conditions. The proposed method can significantly improve the overall performance of the ICPT (inductively coupled power transfer) system by producing continuous waveforms within the system at all times. Simulations based on PLECS (a Simulink toolbox) demonstrate that the new method can successfully control the output voltage resulting in satisfactory steady state performance.","PeriodicalId":181574,"journal":{"name":"2006 International Conference on Power System Technology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124320113","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}
Pub Date : 2006-10-01DOI: 10.1109/ICPST.2006.321551
Jinmin, M. Longhua
At present, the rail transit system adopts DC electric traction. The current required by the vehicles flows out from the traction substation, and then pass through the OCS (overhead contact system) and the running rails. At last, the traction current will return to the traction substation. A proportion of the traction current will leak to earth, such leakage current is called stray current. Generally, the stray current can be calculated indirectly by using the following parameters: the running rail longitudinal resistance, running rail-to-earth resistance and running rail-to-earth voltage. It is necessary to develop on-line monitoring device of stray current in metro. In this paper a novel stray current on-line monitoring device based on embedded microcomputer system is developed. According to the new method presented in this paper, the on-line monitoring device will be installed along the rail, and connected each other with communication cable to form a real-time monitoring system. Comparing with the traditional method that installing the monitoring device at the equal distance along the rail, this novel method could not only reduce the system complexity and funds budget, but also enhance the monitoring accuracy and precision.
{"title":"A Novel On-line Monitoring Device of Stray Current in DC Rail Transit Systems","authors":"Jinmin, M. Longhua","doi":"10.1109/ICPST.2006.321551","DOIUrl":"https://doi.org/10.1109/ICPST.2006.321551","url":null,"abstract":"At present, the rail transit system adopts DC electric traction. The current required by the vehicles flows out from the traction substation, and then pass through the OCS (overhead contact system) and the running rails. At last, the traction current will return to the traction substation. A proportion of the traction current will leak to earth, such leakage current is called stray current. Generally, the stray current can be calculated indirectly by using the following parameters: the running rail longitudinal resistance, running rail-to-earth resistance and running rail-to-earth voltage. It is necessary to develop on-line monitoring device of stray current in metro. In this paper a novel stray current on-line monitoring device based on embedded microcomputer system is developed. According to the new method presented in this paper, the on-line monitoring device will be installed along the rail, and connected each other with communication cable to form a real-time monitoring system. Comparing with the traditional method that installing the monitoring device at the equal distance along the rail, this novel method could not only reduce the system complexity and funds budget, but also enhance the monitoring accuracy and precision.","PeriodicalId":181574,"journal":{"name":"2006 International Conference on Power System Technology","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124076643","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}
Pub Date : 2006-10-01DOI: 10.1109/ICPST.2006.321808
Wu Xiaomeng, L. Jian, Yu Jianming
Not considering the periodic fast fluctuation of the loads of oil pumps, the results of traditional methods of theoretical line losses calculation are much lower than that measured in the practice. To solve above problem, an improved approach is put forward. The distinguishing feature of the loads of oil pumps, i.e., the active power varies periodically with its averaged value not changed while the reactive power maintains approximately unchanged, is made full used of. The active power of an oil pump is formulated in a sine form. In calculation of losses in a feeder or a transformer with many oil pumps, the integral function is simplified by utilizing the orthogonal behavior of sine functions. Combining the proposed approach with the effective current based method, the theoretical losses calculation with hybrid loads of oil pumps and residential customers is deduced. The way to further improve the proposed approach by taking the losses of the downstream devices is discussed. The loss of a typical feeder with 19 loads of Daqing oil filed is calculated by the proposed approach and the traditional method, respectively. Comparison with the measured value shows that the proposed approach is feasible and more accurate.
{"title":"An Improved Approach to Theoretical Losses Analysis of Oil Field Distribution Networks","authors":"Wu Xiaomeng, L. Jian, Yu Jianming","doi":"10.1109/ICPST.2006.321808","DOIUrl":"https://doi.org/10.1109/ICPST.2006.321808","url":null,"abstract":"Not considering the periodic fast fluctuation of the loads of oil pumps, the results of traditional methods of theoretical line losses calculation are much lower than that measured in the practice. To solve above problem, an improved approach is put forward. The distinguishing feature of the loads of oil pumps, i.e., the active power varies periodically with its averaged value not changed while the reactive power maintains approximately unchanged, is made full used of. The active power of an oil pump is formulated in a sine form. In calculation of losses in a feeder or a transformer with many oil pumps, the integral function is simplified by utilizing the orthogonal behavior of sine functions. Combining the proposed approach with the effective current based method, the theoretical losses calculation with hybrid loads of oil pumps and residential customers is deduced. The way to further improve the proposed approach by taking the losses of the downstream devices is discussed. The loss of a typical feeder with 19 loads of Daqing oil filed is calculated by the proposed approach and the traditional method, respectively. Comparison with the measured value shows that the proposed approach is feasible and more accurate.","PeriodicalId":181574,"journal":{"name":"2006 International Conference on Power System Technology","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125771083","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}
Pub Date : 2006-10-01DOI: 10.1109/ICPST.2006.321620
Hao Chen, Jie Wu, Shan Gao
In this paper, ARCH (autoregressive conditional heteroscedasticity) effects of load time series is analyzed and a new feasible method of load forecast based on ARCH model is proposed. The main achievements of the paper involve the following aspects: Firstly, by testing the disturbance series of the classical model, Some witness to the ARCH effect is reported by LM test. Secondly, An ARMA-ARCH model is constructed. This model is judged to have good forecast ability, and compares favourably with ARMA model in theoretic significance. Furthermore, a relatively deep research on the second-order moment of load time series proceeds from such a viewpoint as reverse leverage effect, the mechanism of asymmetric effects between different shocks is demonstrated. Finally, we enhance the ARCH model to a new level with the help of extended ARCH class model. These models have more practical preconditions, and have more powerful applied significance than some classical models. It may be a promising new method for short-time load forecasting.
{"title":"A Study of Autoregressive Conditional Heteroscedasticity Model in Load Forecasting","authors":"Hao Chen, Jie Wu, Shan Gao","doi":"10.1109/ICPST.2006.321620","DOIUrl":"https://doi.org/10.1109/ICPST.2006.321620","url":null,"abstract":"In this paper, ARCH (autoregressive conditional heteroscedasticity) effects of load time series is analyzed and a new feasible method of load forecast based on ARCH model is proposed. The main achievements of the paper involve the following aspects: Firstly, by testing the disturbance series of the classical model, Some witness to the ARCH effect is reported by LM test. Secondly, An ARMA-ARCH model is constructed. This model is judged to have good forecast ability, and compares favourably with ARMA model in theoretic significance. Furthermore, a relatively deep research on the second-order moment of load time series proceeds from such a viewpoint as reverse leverage effect, the mechanism of asymmetric effects between different shocks is demonstrated. Finally, we enhance the ARCH model to a new level with the help of extended ARCH class model. These models have more practical preconditions, and have more powerful applied significance than some classical models. It may be a promising new method for short-time load forecasting.","PeriodicalId":181574,"journal":{"name":"2006 International Conference on Power System Technology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121932450","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}
Pub Date : 2006-10-01DOI: 10.1109/ICPST.2006.321522
Yunseok Lim, K. Shin, Seongdoo Lee, Dongil Lee, Seungdo Baik, Jaejoon Kim, J. Koo
In this work, prior measurements have been carried out of the human exposure to magnetic field near power facilities in Korea according to the measurement procedures of IEC PT62110. These measurements aim for evaluating the exposure levels by use of newly proposed IEC PT62110 of the human body to the magnetic fields on general public. For this purpose, statistical treatment has been conducted with the measured data for the uniform and non-uniform magnetic field exposure.
{"title":"Magnetic Field Measurement based on JEC PT 62 10 near Power Facilities in Korea","authors":"Yunseok Lim, K. Shin, Seongdoo Lee, Dongil Lee, Seungdo Baik, Jaejoon Kim, J. Koo","doi":"10.1109/ICPST.2006.321522","DOIUrl":"https://doi.org/10.1109/ICPST.2006.321522","url":null,"abstract":"In this work, prior measurements have been carried out of the human exposure to magnetic field near power facilities in Korea according to the measurement procedures of IEC PT62110. These measurements aim for evaluating the exposure levels by use of newly proposed IEC PT62110 of the human body to the magnetic fields on general public. For this purpose, statistical treatment has been conducted with the measured data for the uniform and non-uniform magnetic field exposure.","PeriodicalId":181574,"journal":{"name":"2006 International Conference on Power System Technology","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121616000","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}
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