Pub Date : 2014-10-05DOI: 10.13335/J.1000-3673.PST.2014.10.010
Ji Feng, Cao Junzheng, C. Peng, Liu Jie
A PSCAD based 12-pulse converter model for HVDC power transmission, in which the thyristor model with reverse recovery characteristics and the model of nonlinear saturable reactor composed of nonlinear resistance model and controlled current source are contained, is built to research the influences of the transmitted DC current on the iron-core loss of the saturable reactor. Taking the A5000 converter valve used in the rectifier side of ±800 kV/4 750 A UHVDC transmission project from Jinping to Sunan as the example, the iron-core losses of the saturable reactor under three different operation conditions of the UHVDC transmission line are simulated, and the simulation results conform to the on-side measured data. The iron-core loss of the saturable reactor not only comes into being while the converter valve is switching on, but also during the switching off and the off-state of the converter valve. The iron-core loss of the saturable reactor increases with the rise of the DC current.
{"title":"Simulation Study on Iron-Core Loss of Saturable Reactor at Rectifier Valve Side in HVDC Transmission Line","authors":"Ji Feng, Cao Junzheng, C. Peng, Liu Jie","doi":"10.13335/J.1000-3673.PST.2014.10.010","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2014.10.010","url":null,"abstract":"A PSCAD based 12-pulse converter model for HVDC power transmission, in which the thyristor model with reverse recovery characteristics and the model of nonlinear saturable reactor composed of nonlinear resistance model and controlled current source are contained, is built to research the influences of the transmitted DC current on the iron-core loss of the saturable reactor. Taking the A5000 converter valve used in the rectifier side of ±800 kV/4 750 A UHVDC transmission project from Jinping to Sunan as the example, the iron-core losses of the saturable reactor under three different operation conditions of the UHVDC transmission line are simulated, and the simulation results conform to the on-side measured data. The iron-core loss of the saturable reactor not only comes into being while the converter valve is switching on, but also during the switching off and the off-state of the converter valve. The iron-core loss of the saturable reactor increases with the rise of the DC current.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320649","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 : 2014-09-05DOI: 10.13335/J.1000-3673.PST.2014.09.014
Ai Qian Han Xueshan Zhao Yuanyuan Lü Tianguang
{"title":"Fuzzy Theory Based Grid-Connected Power Control of Microgrid Containing Photovoltaic System","authors":"Ai Qian Han Xueshan Zhao Yuanyuan Lü Tianguang","doi":"10.13335/J.1000-3673.PST.2014.09.014","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2014.09.014","url":null,"abstract":"","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320617","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 : 2014-07-05DOI: 10.13335/J.1000-3673.PST.2014.07.019
Gao Jinyan, Li Donghui
In allusion to the reverse power detection of grid-connected irreversible-flow PV generation system, a reverse power detection method based on fitting algorithm of the ellipse parameters and delayed signal cancellation(DSC) is proposed. According to the different features of coefficient of elliptic equations under the occurrence of reverse power and grid fault, whether the reverse power or the fault was occurred can be rapidly detected and judged. The time-domain based DSC algorithm is adopted to eliminate the influence of power grid harmonics on the detection accuracy and real-time performance of the proposed algorithm. Results of both MATLAB/Simulink based simulation and actual operation show that the least square for fitting ellipses method and the proposed cascaded DSC algorithm can accurately distinguish reverse power from power grid fault around a cycle after the occurrence of the reverse power, and the proposed method possesses strong robustness for noise, and the proposed method is feasible.
{"title":"An Elliptical Fitting Algorithm Based Detection Method for Reverse Power","authors":"Gao Jinyan, Li Donghui","doi":"10.13335/J.1000-3673.PST.2014.07.019","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2014.07.019","url":null,"abstract":"In allusion to the reverse power detection of grid-connected irreversible-flow PV generation system, a reverse power detection method based on fitting algorithm of the ellipse parameters and delayed signal cancellation(DSC) is proposed. According to the different features of coefficient of elliptic equations under the occurrence of reverse power and grid fault, whether the reverse power or the fault was occurred can be rapidly detected and judged. The time-domain based DSC algorithm is adopted to eliminate the influence of power grid harmonics on the detection accuracy and real-time performance of the proposed algorithm. Results of both MATLAB/Simulink based simulation and actual operation show that the least square for fitting ellipses method and the proposed cascaded DSC algorithm can accurately distinguish reverse power from power grid fault around a cycle after the occurrence of the reverse power, and the proposed method possesses strong robustness for noise, and the proposed method is feasible.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320317","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 : 2014-07-05DOI: 10.13335/J.1000-3673.PST.2014.07.046
Conglan Tang, Jiping Lu, Yingzhao Xie, Zhang Lu
To improve both realtime performance and accuracy of ultra short-term load forecasting and to cope with the higher requirement of power grid on realtime load forecasting, based on improved data stream on-line segmentation an ultra short-term load forecasting method is proposed. Based on the time trend of load development, the realtime data stream processing is utilized in the proposed method to perform ultra short-term forecasting, then combining with the results of short-term load forecasting, which contain the whether factors and the effect of load cycle property, the realtime forecasting result at the segmentation point is corrected. The fast segmentation and forecasting ability of the proposed method avoid repeat modeling and improve the speed of forecasting; the realtime correction and handling of the segmentation point increase historical information utilization and decrease the error of segmentation point, thus the forecasting accuracy can be maintained at a better level. Actual load data is adopted to validate the effectiveness of the proposed model, and validation results show that both load forecasting accuracy and speed by the proposed model have an advantage over those by several conventional ultra short-term load forecasting algorithms, besides the forecasting error at the inflection point of load can be decreased and the proposed method can also adapt to the sudden change of the weather.
{"title":"Improved Data Stream On-Line Segmentation Based Ultra Short-Term Load Forecasting","authors":"Conglan Tang, Jiping Lu, Yingzhao Xie, Zhang Lu","doi":"10.13335/J.1000-3673.PST.2014.07.046","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2014.07.046","url":null,"abstract":"To improve both realtime performance and accuracy of ultra short-term load forecasting and to cope with the higher requirement of power grid on realtime load forecasting, based on improved data stream on-line segmentation an ultra short-term load forecasting method is proposed. Based on the time trend of load development, the realtime data stream processing is utilized in the proposed method to perform ultra short-term forecasting, then combining with the results of short-term load forecasting, which contain the whether factors and the effect of load cycle property, the realtime forecasting result at the segmentation point is corrected. The fast segmentation and forecasting ability of the proposed method avoid repeat modeling and improve the speed of forecasting; the realtime correction and handling of the segmentation point increase historical information utilization and decrease the error of segmentation point, thus the forecasting accuracy can be maintained at a better level. Actual load data is adopted to validate the effectiveness of the proposed model, and validation results show that both load forecasting accuracy and speed by the proposed model have an advantage over those by several conventional ultra short-term load forecasting algorithms, besides the forecasting error at the inflection point of load can be decreased and the proposed method can also adapt to the sudden change of the weather.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320611","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 : 2014-07-05DOI: 10.13335/J.1000-3673.PST.2014.07.029
W. Tao, Gao Cheng-bin, Gu Xueping, Liang Haiping
Synthesizing power transmission relation, topological structure and operational status of power grid a concept of power betweenness is proposed. According to network connectivity and the allocation of power transferring, the power betweenness of transmission line and that of node are defined respectively. Through the cascading attacks such as the breakage or overload on critical transmission lines, the effectiveness validation of the selected critical transmission lines is performed. Taking IEEE 39-bus system as the testing example, the power betweenness of transmission lines and that of nodes are calculated and sorted; according to sorted results, attacks are made on these elements to verify that these elements with high power betweenness are the weak links in power grid indeed. The stability verification under the static attack is performed by network efficiency function and power flow entropy respectively. Verification results show that the higher the power betweenness of electric element is, the greater the attack affects power grid operation.
{"title":"Power Betweenness Based Identification of Power Grid Critical Links","authors":"W. Tao, Gao Cheng-bin, Gu Xueping, Liang Haiping","doi":"10.13335/J.1000-3673.PST.2014.07.029","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2014.07.029","url":null,"abstract":"Synthesizing power transmission relation, topological structure and operational status of power grid a concept of power betweenness is proposed. According to network connectivity and the allocation of power transferring, the power betweenness of transmission line and that of node are defined respectively. Through the cascading attacks such as the breakage or overload on critical transmission lines, the effectiveness validation of the selected critical transmission lines is performed. Taking IEEE 39-bus system as the testing example, the power betweenness of transmission lines and that of nodes are calculated and sorted; according to sorted results, attacks are made on these elements to verify that these elements with high power betweenness are the weak links in power grid indeed. The stability verification under the static attack is performed by network efficiency function and power flow entropy respectively. Verification results show that the higher the power betweenness of electric element is, the greater the attack affects power grid operation.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320552","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 : 2014-07-05DOI: 10.13335/J.1000-3673.PST.2014.07.020
Z. Hua, Xie Kai-gui
On the basis of analyzing the principle of photovoltaic(PV) generation and mathematical model of PC cells, the modeling and PSCAD-based simulation of large-scale PV generation station composed of several PV arrays are performed. Using both constant voltage tracking method and the measurement-based table data, the maximum power point tracking(MPPT) of large-scale PV array is implemented, and corresponding control strategy for grid-connected inverters is drafted. Finally, both normal operation of large-scale PV generation station and three-phase short-circuit fault occurred inside/outside the PV station are simulated and analyzed.
{"title":"PSCAD Based Simulation and Analysis on PV Power Station","authors":"Z. Hua, Xie Kai-gui","doi":"10.13335/J.1000-3673.PST.2014.07.020","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2014.07.020","url":null,"abstract":"On the basis of analyzing the principle of photovoltaic(PV) generation and mathematical model of PC cells, the modeling and PSCAD-based simulation of large-scale PV generation station composed of several PV arrays are performed. Using both constant voltage tracking method and the measurement-based table data, the maximum power point tracking(MPPT) of large-scale PV array is implemented, and corresponding control strategy for grid-connected inverters is drafted. Finally, both normal operation of large-scale PV generation station and three-phase short-circuit fault occurred inside/outside the PV station are simulated and analyzed.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320427","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 : 2014-05-05DOI: 10.13335/J.1000-3673.PST.2014.05.011
Wu Ping, Yang Yanchen, Chen Hao, Yi Jun, Bu Guang-quan
In the future, the third generation of nuclear power reactor AP1000 may become the main type in China. The results of analyzing the design idea and the power operation characteristics of AP1000 show that AP1000 nuclear generating unit possesses satisfied load regulation characteristics, so it can be participated in peak load regulation of power grid. On the basis of mastering physical characteristics of core reactivity of AP1000 and its coupling features with neutron-flux, a core simulation model is established to research the interaction between state variables and control variables of the core under small disturbance inside the core or large disturbance outside the core. Simulation results show that the reactivity caused by state variables mainly copes with the post-disturbance stable operation of the core, and the reactivity caused by control variables ensures the core power enable to reach a new equilibrium point along with the trajectory variation of the disturbance.
{"title":"Research on Operational Characteristics and Core Simulation of the Third-Generation Nuclear Reactor AP1000","authors":"Wu Ping, Yang Yanchen, Chen Hao, Yi Jun, Bu Guang-quan","doi":"10.13335/J.1000-3673.PST.2014.05.011","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2014.05.011","url":null,"abstract":"In the future, the third generation of nuclear power reactor AP1000 may become the main type in China. The results of analyzing the design idea and the power operation characteristics of AP1000 show that AP1000 nuclear generating unit possesses satisfied load regulation characteristics, so it can be participated in peak load regulation of power grid. On the basis of mastering physical characteristics of core reactivity of AP1000 and its coupling features with neutron-flux, a core simulation model is established to research the interaction between state variables and control variables of the core under small disturbance inside the core or large disturbance outside the core. Simulation results show that the reactivity caused by state variables mainly copes with the post-disturbance stable operation of the core, and the reactivity caused by control variables ensures the core power enable to reach a new equilibrium point along with the trajectory variation of the disturbance.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320097","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 : 2014-04-05DOI: 10.13335/J.1000-3673.PST.2014.04.020
Yang Yong, Li Shihua, Z. Binbin, Tao Xuehui, Zhao Fangping, Wang Zhi-bing
According to the feature of single-phase photovoltaic(PV) grid-connected inverter, a flexible power control method for single-phase PV grid-connected inverter in stationary coordinate system is proposed. Two orthogonal voltages, one of which is of the same phase as grid voltage and the phase of another one lags behind the grid voltage by 90°, are obtained by second order generalized integral(SOGI) algorithm, and the fast tracking of given current can be implemented by proportional quasi-resonant(PQR) controller in the two-phase stationary coordinate system. Experimental results show that using the proposed control method the decoupling control of active and reactive power can be realized, and the control system possesses good static and dynamic performances.
{"title":"A Second Order Generalized Integrator Based Flexible Power Control for Single-Phase Photovoltaic Grid-Connected Inverter","authors":"Yang Yong, Li Shihua, Z. Binbin, Tao Xuehui, Zhao Fangping, Wang Zhi-bing","doi":"10.13335/J.1000-3673.PST.2014.04.020","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2014.04.020","url":null,"abstract":"According to the feature of single-phase photovoltaic(PV) grid-connected inverter, a flexible power control method for single-phase PV grid-connected inverter in stationary coordinate system is proposed. Two orthogonal voltages, one of which is of the same phase as grid voltage and the phase of another one lags behind the grid voltage by 90°, are obtained by second order generalized integral(SOGI) algorithm, and the fast tracking of given current can be implemented by proportional quasi-resonant(PQR) controller in the two-phase stationary coordinate system. Experimental results show that using the proposed control method the decoupling control of active and reactive power can be realized, and the control system possesses good static and dynamic performances.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320034","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 : 2014-02-05DOI: 10.13335/J.1000-3673.PST.2014.02.020
X. Bai, Cong Jing, Gao Xiaofeng, Gu Yu
In allusion to restricted grid-connected capacity and high wind power curtailment when large-scale wind farm is grid-connected,in usual it is considered to improve power grid's ability of accommodating wind power by energy storage system,however how to evaluate the overall efficiency of the hybrid wind power-pumped storage system is the problem to be solved well.For this reason,the investment cost,economic benefit of pumped storage system and its operational constraints are analyzed,thus the follow-up mechanism between comprehensive benefits of hybrid wind power-pumped storage system and energy storage capacity under optimized operating condition of regional power grid is revealed,and a mathematical model to solve the comprehensive benefits is established and a method to evaluate the comprehensive benefits is proposed.Based on output curves of mutually matched thermal generation units,wind power and load characteristics of power grid and combining with the installation capacity of thermal generation units and utilizing the incidence relation between system frequency and load(or the change of power generation),the proposed method quantitatively analyzes the impacts of the change of such factors of pumped storage station as its capacity,service life,cost and revenue on comprehensive benefits and power grid's accommodation ability of wind power.Case analysis shows that proposed evaluation method is effective.
{"title":"A Method to Evaluate Comprehensive Benefits of Hybrid Wind Power-Pumped Storage System","authors":"X. Bai, Cong Jing, Gao Xiaofeng, Gu Yu","doi":"10.13335/J.1000-3673.PST.2014.02.020","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2014.02.020","url":null,"abstract":"In allusion to restricted grid-connected capacity and high wind power curtailment when large-scale wind farm is grid-connected,in usual it is considered to improve power grid's ability of accommodating wind power by energy storage system,however how to evaluate the overall efficiency of the hybrid wind power-pumped storage system is the problem to be solved well.For this reason,the investment cost,economic benefit of pumped storage system and its operational constraints are analyzed,thus the follow-up mechanism between comprehensive benefits of hybrid wind power-pumped storage system and energy storage capacity under optimized operating condition of regional power grid is revealed,and a mathematical model to solve the comprehensive benefits is established and a method to evaluate the comprehensive benefits is proposed.Based on output curves of mutually matched thermal generation units,wind power and load characteristics of power grid and combining with the installation capacity of thermal generation units and utilizing the incidence relation between system frequency and load(or the change of power generation),the proposed method quantitatively analyzes the impacts of the change of such factors of pumped storage station as its capacity,service life,cost and revenue on comprehensive benefits and power grid's accommodation ability of wind power.Case analysis shows that proposed evaluation method is effective.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66319931","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 : 2014-01-01DOI: 10.13335/J.1000-3673.PST.2014.06.019
Xuebao Li, X. Cui, T. Lu, Di Zhang
The time-domain waveform of audible noise caused by the discharge of single positive corona source is obtained by the time-domain test platform set up in the laboratory. According to the pulse characteristic of time-domain waveform of audible noise it is proposed to utilize segmented double-exponential function to fit single time-domain pulse waveform of single audible noise to obtain empirical waveform, and through the comparative research on fitting results and measured results in time-domain and frequency-domain the reasonableness of the proposed method of the fitted waveform is validated. Finally, based on the measured results of long-term audible noise in time-domain the statistical characteristics of fitting parameters of the segmented double-exponential function under different voltages and that of waveform parameters of audible noise. Experimental results show that due to the randomness of corona discharge, the pulse waveform parameters and waveform fitting parameters evidently fluctuate under the same voltage; the time interval of audible noise pulse decreased with the increase of the applied voltage, however the pulse width and its apparent duration slightly varies under different voltages.
{"title":"Analysis and Fitting of the Time-domain Waveform of the Audible Noise Caused by Single Positive Corona Source on the Conductor","authors":"Xuebao Li, X. Cui, T. Lu, Di Zhang","doi":"10.13335/J.1000-3673.PST.2014.06.019","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2014.06.019","url":null,"abstract":"The time-domain waveform of audible noise caused by the discharge of single positive corona source is obtained by the time-domain test platform set up in the laboratory. According to the pulse characteristic of time-domain waveform of audible noise it is proposed to utilize segmented double-exponential function to fit single time-domain pulse waveform of single audible noise to obtain empirical waveform, and through the comparative research on fitting results and measured results in time-domain and frequency-domain the reasonableness of the proposed method of the fitted waveform is validated. Finally, based on the measured results of long-term audible noise in time-domain the statistical characteristics of fitting parameters of the segmented double-exponential function under different voltages and that of waveform parameters of audible noise. Experimental results show that due to the randomness of corona discharge, the pulse waveform parameters and waveform fitting parameters evidently fluctuate under the same voltage; the time interval of audible noise pulse decreased with the increase of the applied voltage, however the pulse width and its apparent duration slightly varies under different voltages.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320122","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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