Pub Date : 2012-05-21DOI: 10.1109/ISGT-ASIA.2012.6303156
Qiming Cui, Sheng Wei Liu, Hong Xing Liu, Zhihui Wang
Pro/3 v1.1.1-the production system-type expert system shell based on Visual Prolog6.2 is introduced. The parameter rule function of inexact rules was corrected in the Pro/3. Its corrective code is given. The expert system about shopping and assessment of a current transformer was implemented by researching the Pro/3. The goal of the expert system is that it gives a degree of suitability (membership grade) description for preference current transformer to a user by analysing a request and preference of the user for the current transformer brand, type, price etc. and deriving sentences for making decision. The sentences and application of rules are partly illustrated in the paper. Finally, the result of practice verifies the validity and the practicability of the expert system.
{"title":"Application research of the production system-type expert system shell Pro/3 under Smart Grid","authors":"Qiming Cui, Sheng Wei Liu, Hong Xing Liu, Zhihui Wang","doi":"10.1109/ISGT-ASIA.2012.6303156","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2012.6303156","url":null,"abstract":"Pro/3 v1.1.1-the production system-type expert system shell based on Visual Prolog6.2 is introduced. The parameter rule function of inexact rules was corrected in the Pro/3. Its corrective code is given. The expert system about shopping and assessment of a current transformer was implemented by researching the Pro/3. The goal of the expert system is that it gives a degree of suitability (membership grade) description for preference current transformer to a user by analysing a request and preference of the user for the current transformer brand, type, price etc. and deriving sentences for making decision. The sentences and application of rules are partly illustrated in the paper. Finally, the result of practice verifies the validity and the practicability of the expert system.","PeriodicalId":330758,"journal":{"name":"IEEE PES Innovative Smart Grid Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130069950","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}
For large-scale photovoltaic power station connected to medium-voltage grid, it is not proper to evaluate its power quality by traditional limitation in China. In this paper, it proposes testing technology and research in order to evaluate the power quality for large-scale photovoltaic power station according to latest photovoltaic standards. The tests will focus on flicker, harmonics, inter-harmonics and high frequency components. For voltage flicker under either continuous operation or switching operation, it gives one method which simulates the voltage fluctuation imposed by photovoltaic power station and calculates flicker emission on a fictitious grid, thereby avoiding the direct influence of the real voltage fluctuation of the grid at the measurement point on flicker. For current harmonics, interharmonics and high frequency components over continuous operation, it specifies the individual current components as sub grouped values in accordance with IEC 61000-4-7][1]. For the purpose of including the effect of voltage fluctuations during actual measurement, the choice of sub grouping method is applied.
{"title":"Testing technology and research on power quality for large-scale photovoltaic power station connected to the grid","authors":"Songming Zhu, Junjun Zhang, Xiaodi Qin, Chen-guang Niu","doi":"10.1109/ISGT-ASIA.2012.6303298","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2012.6303298","url":null,"abstract":"For large-scale photovoltaic power station connected to medium-voltage grid, it is not proper to evaluate its power quality by traditional limitation in China. In this paper, it proposes testing technology and research in order to evaluate the power quality for large-scale photovoltaic power station according to latest photovoltaic standards. The tests will focus on flicker, harmonics, inter-harmonics and high frequency components. For voltage flicker under either continuous operation or switching operation, it gives one method which simulates the voltage fluctuation imposed by photovoltaic power station and calculates flicker emission on a fictitious grid, thereby avoiding the direct influence of the real voltage fluctuation of the grid at the measurement point on flicker. For current harmonics, interharmonics and high frequency components over continuous operation, it specifies the individual current components as sub grouped values in accordance with IEC 61000-4-7][1]. For the purpose of including the effect of voltage fluctuations during actual measurement, the choice of sub grouping method is applied.","PeriodicalId":330758,"journal":{"name":"IEEE PES Innovative Smart Grid Technologies","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133107044","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 : 2012-05-21DOI: 10.1109/ISGT-ASIA.2012.6303388
Hua Ouyang, Jialin Wang
A method of power system transient signal analysis based on improved Prony algorithm and neural network is used here to improve the accuracy of analysis of the transient signal with harmonic and inter-harmonic. The model of the Prony algorithm has the excellent characteristic of exactly describing transient signal and directly acquiring the frequency of signal. The frequency components of the signal were estimated assumably using Prony algorithm to confirm the amount of nerve cells and the beginning parameter of neural network firstly. Next, each frequency was treated as weight to be adjusted to estimate frequency values and amplitudes of the base wave, harmonics and inter-harmonics. Matlab simulation results demonstrated that the algorithm achieved high accuracy and rapid convergence.
{"title":"Power system transient signal analysis based on Prony algorithm and neural network","authors":"Hua Ouyang, Jialin Wang","doi":"10.1109/ISGT-ASIA.2012.6303388","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2012.6303388","url":null,"abstract":"A method of power system transient signal analysis based on improved Prony algorithm and neural network is used here to improve the accuracy of analysis of the transient signal with harmonic and inter-harmonic. The model of the Prony algorithm has the excellent characteristic of exactly describing transient signal and directly acquiring the frequency of signal. The frequency components of the signal were estimated assumably using Prony algorithm to confirm the amount of nerve cells and the beginning parameter of neural network firstly. Next, each frequency was treated as weight to be adjusted to estimate frequency values and amplitudes of the base wave, harmonics and inter-harmonics. Matlab simulation results demonstrated that the algorithm achieved high accuracy and rapid convergence.","PeriodicalId":330758,"journal":{"name":"IEEE PES Innovative Smart Grid Technologies","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133178133","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 : 2012-05-21DOI: 10.1109/ISGT-ASIA.2012.6303095
Zhang Linli, Gao Houlei, X. Bingyin, Xue Yongduan
A new fault location method based on zero sequence admittance measurement is presented in order to solve the fault location problem of single phase-to-earth fault in non-solidly earthed distribution network. The zero sequence admittance is calculated using measured zero sequence current and zero sequence voltage at sectionalized switch. The fault direction is determined by master station according to the angle of measured admittance, and then the faulty section is located by analyzing the fault direction results of different sectionalized switches. This method can be implemented in distribution automation (DA) system using the feeder terminal unit (FTU) as field measurement equipment, without requiring of additional equipment. The feasibility and accuracy of this proposed method is proved by the ATP simulation results.
{"title":"Fault location method based on zero sequence admittance measurement in non-effectively earthed system","authors":"Zhang Linli, Gao Houlei, X. Bingyin, Xue Yongduan","doi":"10.1109/ISGT-ASIA.2012.6303095","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2012.6303095","url":null,"abstract":"A new fault location method based on zero sequence admittance measurement is presented in order to solve the fault location problem of single phase-to-earth fault in non-solidly earthed distribution network. The zero sequence admittance is calculated using measured zero sequence current and zero sequence voltage at sectionalized switch. The fault direction is determined by master station according to the angle of measured admittance, and then the faulty section is located by analyzing the fault direction results of different sectionalized switches. This method can be implemented in distribution automation (DA) system using the feeder terminal unit (FTU) as field measurement equipment, without requiring of additional equipment. The feasibility and accuracy of this proposed method is proved by the ATP simulation results.","PeriodicalId":330758,"journal":{"name":"IEEE PES Innovative Smart Grid Technologies","volume":"149 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122382297","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 : 2012-05-21DOI: 10.1109/ISGT-ASIA.2012.6303305
P. Zhan, Weixing Lin, J. Wen, M. Yao, Naihu Li
Wind power generator based on Doubly Fed Induction Generator (DFIG) incorporates a back-to-back PWM converter. Filters are used to eliminate the harmonics produced by the PWM converter. However, very few papers have detailed the design procedure of the filters for a DFIG based wind power generator. A systematic procedure to design the LCL filters for DFIG back-to-back converter is proposed in this paper. Both filters for the grid side converter and the rotor side converter are designed. Simulations in PSCAD/EMTDC verify the effectiveness of the design procedure.
{"title":"Design of LCL filters for the back-to-back converter in a Doubly Fed Induction Generator","authors":"P. Zhan, Weixing Lin, J. Wen, M. Yao, Naihu Li","doi":"10.1109/ISGT-ASIA.2012.6303305","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2012.6303305","url":null,"abstract":"Wind power generator based on Doubly Fed Induction Generator (DFIG) incorporates a back-to-back PWM converter. Filters are used to eliminate the harmonics produced by the PWM converter. However, very few papers have detailed the design procedure of the filters for a DFIG based wind power generator. A systematic procedure to design the LCL filters for DFIG back-to-back converter is proposed in this paper. Both filters for the grid side converter and the rotor side converter are designed. Simulations in PSCAD/EMTDC verify the effectiveness of the design procedure.","PeriodicalId":330758,"journal":{"name":"IEEE PES Innovative Smart Grid Technologies","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122676704","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 : 2012-05-21DOI: 10.1109/ISGT-ASIA.2012.6303207
Li Lin, Linli Jia, Huilong Zhao, Tian Shi, Haojiong Li
In this paper, a method based on voltage stability is proposed to determine the maximum sizes of multiple new wind farms on a certain probability. Based on the Weibull probability density function, the formulation of the relation between the maximum sizes of wind farms and the allowable output of wind farms on a certain probability has been given. Afterwards, the iteration strategy was given, when making the voltage stability margin as the index of system stability. Finally, the method proposed in this paper was applied to a practical example in PSS/E. The result shows that the method proposed in this paper can be adopted to calculate the maximum sizes of multiple wind farms simultaneously and accurately.
{"title":"Investigation of maximum probabilistic capacity of wind farms based on voltage stability","authors":"Li Lin, Linli Jia, Huilong Zhao, Tian Shi, Haojiong Li","doi":"10.1109/ISGT-ASIA.2012.6303207","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2012.6303207","url":null,"abstract":"In this paper, a method based on voltage stability is proposed to determine the maximum sizes of multiple new wind farms on a certain probability. Based on the Weibull probability density function, the formulation of the relation between the maximum sizes of wind farms and the allowable output of wind farms on a certain probability has been given. Afterwards, the iteration strategy was given, when making the voltage stability margin as the index of system stability. Finally, the method proposed in this paper was applied to a practical example in PSS/E. The result shows that the method proposed in this paper can be adopted to calculate the maximum sizes of multiple wind farms simultaneously and accurately.","PeriodicalId":330758,"journal":{"name":"IEEE PES Innovative Smart Grid Technologies","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123060226","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 : 2012-05-21DOI: 10.1109/ISGT-ASIA.2012.6303244
Wang Bo, D. Mei, Lu Jun, Zheng Tao, Shan Xin, Liu Dong
Based on the visualization platform of the dispatching technical support system of smart grid, an overall scheme design and application implementation of the visualization for power system dynamic monitoring is presented. The overall visualization process framework, the overall interface design and the application visual effects of power system dynamic monitoring based on the wide area measurement system (WAMS) are described in detail. It is indicated from its application in smart grid dispatching system of Jiangsu province in China that the visualization functions for the applications of WAMS can realize an efficient, accurate monitoring and alarming for the dynamic operation status of electric power system and allow operators to grasp important system information quickly and intuitively.
{"title":"The visualization design and realization of wide area measurement system","authors":"Wang Bo, D. Mei, Lu Jun, Zheng Tao, Shan Xin, Liu Dong","doi":"10.1109/ISGT-ASIA.2012.6303244","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2012.6303244","url":null,"abstract":"Based on the visualization platform of the dispatching technical support system of smart grid, an overall scheme design and application implementation of the visualization for power system dynamic monitoring is presented. The overall visualization process framework, the overall interface design and the application visual effects of power system dynamic monitoring based on the wide area measurement system (WAMS) are described in detail. It is indicated from its application in smart grid dispatching system of Jiangsu province in China that the visualization functions for the applications of WAMS can realize an efficient, accurate monitoring and alarming for the dynamic operation status of electric power system and allow operators to grasp important system information quickly and intuitively.","PeriodicalId":330758,"journal":{"name":"IEEE PES Innovative Smart Grid Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128499984","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 : 2012-05-21DOI: 10.1109/ISGT-ASIA.2012.6303197
Xuefang Liu, Hongtao Wang
With large-scale wind farms integrated into the grid, to insure the security of the point of common coupling (PCC), and decrease the control action cost of the discrete equipment, an area automatic voltage control strategy considering ultra-short-term wind power forecasting is proposed. Area AVC is divided into three hierarchies: system wide control, wind farm level control and equipment level. In this paper, a two-tier and multi-stage control strategy is proposed for the wind farm level control. First tier determines the control strategies of discrete reactive power control equipment spanning several hours based on the ultra-short-term wind power forecasting. The second tier divides the time interval of first tier into multiple stages and gives the strategy of continuous reactive power equipment of each stage. This control strategy can decrease the switching time of the discrete equipment and eliminate the voltage deviation step by step, taking account of economy and security. Finally, a case demonstrates the validity of the strategy.
{"title":"Area automatic voltage control based on wind power forecasting of large-scale wind farms","authors":"Xuefang Liu, Hongtao Wang","doi":"10.1109/ISGT-ASIA.2012.6303197","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2012.6303197","url":null,"abstract":"With large-scale wind farms integrated into the grid, to insure the security of the point of common coupling (PCC), and decrease the control action cost of the discrete equipment, an area automatic voltage control strategy considering ultra-short-term wind power forecasting is proposed. Area AVC is divided into three hierarchies: system wide control, wind farm level control and equipment level. In this paper, a two-tier and multi-stage control strategy is proposed for the wind farm level control. First tier determines the control strategies of discrete reactive power control equipment spanning several hours based on the ultra-short-term wind power forecasting. The second tier divides the time interval of first tier into multiple stages and gives the strategy of continuous reactive power equipment of each stage. This control strategy can decrease the switching time of the discrete equipment and eliminate the voltage deviation step by step, taking account of economy and security. Finally, a case demonstrates the validity of the strategy.","PeriodicalId":330758,"journal":{"name":"IEEE PES Innovative Smart Grid Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128635275","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 : 2012-05-21DOI: 10.1109/ISGT-ASIA.2012.6303335
H. Bitaraf, M. Sheikholeslamzadeh, A. Ranjbar, Babak Mozafari
Passive islanding detection schemes are more used in utilities due to their low costs and less harmonic problems although having larger Non Detection Zones (NDZ) relative to other schemes. Passive system measurements at the point of common coupling (PCC) are the basis of this scheme. A new approach in passive techniques is the use of intelligent based methods in data-mining to classify the system parameters which affect the islanding detection. As a result, by finding an efficient and robust data-mining algorithm, the passive schemes problem, which is their relatively large NDZ, will be minimized. In this paper, massive measurements are collected by simulation of IEEE standard distribution system in PSCAD/EMTP environment. These indices include current, voltage, frequency, active power and frequency over active power. The classifying process of these indices is done by the Support Vector Machine (SVM) using MATLAB software. The results show the efficiency with good speed of SVM in passive islanding detection schemes. Also, this paper studies the best two indices which can be used for islanding detection. SVM technique can be easily implemented in the Micro Grid with different types and penetration levels of Distributed Generation (DG).
{"title":"A novel SVM approach of islanding detection in micro grid","authors":"H. Bitaraf, M. Sheikholeslamzadeh, A. Ranjbar, Babak Mozafari","doi":"10.1109/ISGT-ASIA.2012.6303335","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2012.6303335","url":null,"abstract":"Passive islanding detection schemes are more used in utilities due to their low costs and less harmonic problems although having larger Non Detection Zones (NDZ) relative to other schemes. Passive system measurements at the point of common coupling (PCC) are the basis of this scheme. A new approach in passive techniques is the use of intelligent based methods in data-mining to classify the system parameters which affect the islanding detection. As a result, by finding an efficient and robust data-mining algorithm, the passive schemes problem, which is their relatively large NDZ, will be minimized. In this paper, massive measurements are collected by simulation of IEEE standard distribution system in PSCAD/EMTP environment. These indices include current, voltage, frequency, active power and frequency over active power. The classifying process of these indices is done by the Support Vector Machine (SVM) using MATLAB software. The results show the efficiency with good speed of SVM in passive islanding detection schemes. Also, this paper studies the best two indices which can be used for islanding detection. SVM technique can be easily implemented in the Micro Grid with different types and penetration levels of Distributed Generation (DG).","PeriodicalId":330758,"journal":{"name":"IEEE PES Innovative Smart Grid Technologies","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128635717","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 : 2012-05-21DOI: 10.1109/ISGT-ASIA.2012.6303275
Zhongzhou Li, Yongli Li, Guibin Fu, Botong Li
As a new form of network in current power system, micro-grid is mainly used in low voltage network in the three-phase four-wire operation mode. Multi-access network form of distributed powers makes micro-grid protection have directional function, and has negative impact on the traditional distribution network current protection scheme. Based on the practical application of micro-grid and multi-port network theory, this thesis proposes a new directional protection method by using the fault component energy function. This work simulates various fault types in micro-grid built by PSCAD and utilizes Matlab to process experimental data. The results show that the method is correct for any fault type.
{"title":"Directional protection based on fault component energy function in micro-grid","authors":"Zhongzhou Li, Yongli Li, Guibin Fu, Botong Li","doi":"10.1109/ISGT-ASIA.2012.6303275","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2012.6303275","url":null,"abstract":"As a new form of network in current power system, micro-grid is mainly used in low voltage network in the three-phase four-wire operation mode. Multi-access network form of distributed powers makes micro-grid protection have directional function, and has negative impact on the traditional distribution network current protection scheme. Based on the practical application of micro-grid and multi-port network theory, this thesis proposes a new directional protection method by using the fault component energy function. This work simulates various fault types in micro-grid built by PSCAD and utilizes Matlab to process experimental data. The results show that the method is correct for any fault type.","PeriodicalId":330758,"journal":{"name":"IEEE PES Innovative Smart Grid Technologies","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115507819","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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