Pub Date : 2016-04-06DOI: 10.1109/JPETS.2016.2550601
R. Varma, S. Rahman, T. Vanderheide, M. Dang
This paper presents one of the first studies of the harmonic impact of a significantly large photovoltaic (PV) solar farm of 20 MW in a utility distribution system. This solar farm is a constituent of the 80-MW PV solar farm in Sarnia, Ontario, which is so far the largest solar farm in Canada. The utility network is modeled in detail using the commercial grade PSCAD/EMTDC software, which is validated through load flow studies conducted by CYME software and correlated with SCADA measurements. The validated network model is used for network resonance study and harmonics impact analysis of the solar farms under different network conditions. The harmonics data instrumented for several months were provided by the transmission utility at the two solar farm units and at the main feeder substation. These data were utilized for extensive harmonic impact studies with widely different short-circuit levels and network resonance conditions. This paper presents the detailed procedure adopted for performing such harmonic impact studies. It is concluded that this large solar farm may not cause any substantial voltage distortion on the distribution network during steady-state operating conditions. However, recommendations are made for utilities to perform such studies to ensure the safe operation of critical loads.
{"title":"Harmonic Impact of a 20-MW PV Solar Farm on a Utility Distribution Network","authors":"R. Varma, S. Rahman, T. Vanderheide, M. Dang","doi":"10.1109/JPETS.2016.2550601","DOIUrl":"https://doi.org/10.1109/JPETS.2016.2550601","url":null,"abstract":"This paper presents one of the first studies of the harmonic impact of a significantly large photovoltaic (PV) solar farm of 20 MW in a utility distribution system. This solar farm is a constituent of the 80-MW PV solar farm in Sarnia, Ontario, which is so far the largest solar farm in Canada. The utility network is modeled in detail using the commercial grade PSCAD/EMTDC software, which is validated through load flow studies conducted by CYME software and correlated with SCADA measurements. The validated network model is used for network resonance study and harmonics impact analysis of the solar farms under different network conditions. The harmonics data instrumented for several months were provided by the transmission utility at the two solar farm units and at the main feeder substation. These data were utilized for extensive harmonic impact studies with widely different short-circuit levels and network resonance conditions. This paper presents the detailed procedure adopted for performing such harmonic impact studies. It is concluded that this large solar farm may not cause any substantial voltage distortion on the distribution network during steady-state operating conditions. However, recommendations are made for utilities to perform such studies to ensure the safe operation of critical loads.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122336368","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 : 2016-03-25DOI: 10.1109/JPETS.2016.2537274
E. Bortoni, Bruno Tonsic de Araujo, J. Jardini
This paper introduces the constant excitation test to be applied in synchronous machines. The results obtained from this test allow the determination of the quadrature axis synchronous reactance of the salient pole synchronous machines. Despite standard present methods for its determination, the proposed method is suitable for large installed machines. The method basis is described and it is applied to several existent hydrogenerators. The calculated quadrature axis synchronous reactances are compared with the values supplied by the manufacturers, resulting in very good agreement. The appendix shows the quadrature axis location from the previous calculations results to obtain transient parameters from load rejection test.
{"title":"Estimation of Quadrature Axis Synchronous Reactance Using the Constant Excitation Test","authors":"E. Bortoni, Bruno Tonsic de Araujo, J. Jardini","doi":"10.1109/JPETS.2016.2537274","DOIUrl":"https://doi.org/10.1109/JPETS.2016.2537274","url":null,"abstract":"This paper introduces the constant excitation test to be applied in synchronous machines. The results obtained from this test allow the determination of the quadrature axis synchronous reactance of the salient pole synchronous machines. Despite standard present methods for its determination, the proposed method is suitable for large installed machines. The method basis is described and it is applied to several existent hydrogenerators. The calculated quadrature axis synchronous reactances are compared with the values supplied by the manufacturers, resulting in very good agreement. The appendix shows the quadrature axis location from the previous calculations results to obtain transient parameters from load rejection test.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129900194","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 : 2016-02-19DOI: 10.1109/JPETS.2016.2521584
A. A. Gebreel, Longya Xu
Power conversion from ultravoltage direct current (UVdc) to ultravoltage alternating current (UVac) is the biggest challenge facing industrial power application companies. Converting UVdc transmission systems with 2200 kV dc and distance up to 3000 km into UVac is the most challenging issue associated with transmitting power by UVdc transmission systems. This paper proposes an approximated arm energy control algorithm for a modular multilevel converter with a large scale of submodules per arm to convert UVdc of 2200 kV and more into UVac in order to achieve total harmonics distortion for UVac systems of <;1%. Generating insertion indices by utilizing upper and lower approximated arms' energies equations for the numbers of submodule per arm (N) is derived first. Second, the flooring switching pulsewidth modulation is explained in order to generate the number of inserted and bypassed submodules per arm. Third, submodules' selections are proposed and verified by the simulations. Fourth, a set of simulation results for a dc bus of 2200 kV and 481 levels for the output voltage conducted in the MATLAB/Simulink environment are presented to verify the proposed algorithm. Finally, the proposed algorithm is experimentally verified by the hardware and software designs of the prototype.
{"title":"DC–AC Power Conversion Based on Using Modular Multilevel Converter With Arm Energy Approximation Control","authors":"A. A. Gebreel, Longya Xu","doi":"10.1109/JPETS.2016.2521584","DOIUrl":"https://doi.org/10.1109/JPETS.2016.2521584","url":null,"abstract":"Power conversion from ultravoltage direct current (UVdc) to ultravoltage alternating current (UVac) is the biggest challenge facing industrial power application companies. Converting UVdc transmission systems with 2200 kV dc and distance up to 3000 km into UVac is the most challenging issue associated with transmitting power by UVdc transmission systems. This paper proposes an approximated arm energy control algorithm for a modular multilevel converter with a large scale of submodules per arm to convert UVdc of 2200 kV and more into UVac in order to achieve total harmonics distortion for UVac systems of <;1%. Generating insertion indices by utilizing upper and lower approximated arms' energies equations for the numbers of submodule per arm (N) is derived first. Second, the flooring switching pulsewidth modulation is explained in order to generate the number of inserted and bypassed submodules per arm. Third, submodules' selections are proposed and verified by the simulations. Fourth, a set of simulation results for a dc bus of 2200 kV and 481 levels for the output voltage conducted in the MATLAB/Simulink environment are presented to verify the proposed algorithm. Finally, the proposed algorithm is experimentally verified by the hardware and software designs of the prototype.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"18 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129976497","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 : 2016-02-02DOI: 10.1109/JPETS.2016.2516944
H. Nugraha, Zivion O. Silalahi, N. Sinisuka
The application of reliability, availability, maintainability, and security (RAMS) analysis is currently developing in many fields of an electrical power system. The focus of this paper is to demonstrate the applicability of RAMS to analyze maintenance planning on the 150-kV submarine cables of the Java-Bali power transmission system in Indonesia. In this maintenance decision model, four alternatives of a maintenance scheme are made based on maintenance interval and cable's mechanical protection. Monte Carlo simulation will be used to obtain a RAMS value of each alternative. The decision is made based on a cost-effectiveness parameter using a life cycle cost analysis.
{"title":"Maintenance Decision Models for Java–Bali 150-kV Power Transmission Submarine Cable Using RAMS","authors":"H. Nugraha, Zivion O. Silalahi, N. Sinisuka","doi":"10.1109/JPETS.2016.2516944","DOIUrl":"https://doi.org/10.1109/JPETS.2016.2516944","url":null,"abstract":"The application of reliability, availability, maintainability, and security (RAMS) analysis is currently developing in many fields of an electrical power system. The focus of this paper is to demonstrate the applicability of RAMS to analyze maintenance planning on the 150-kV submarine cables of the Java-Bali power transmission system in Indonesia. In this maintenance decision model, four alternatives of a maintenance scheme are made based on maintenance interval and cable's mechanical protection. Monte Carlo simulation will be used to obtain a RAMS value of each alternative. The decision is made based on a cost-effectiveness parameter using a life cycle cost analysis.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132293516","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 : 2016-01-08DOI: 10.1109/JPETS.2015.2508785
Xiaodong Liang, Jinwei He
Medium voltage drives (MVDs) are commonly used in high-power applications and show significant impact on the overall system dynamics due to their large size and high power demand. Although detailed switching models for MVDs can be built using MATLAB/Simulink, such models cannot be used in large-scale simulation software for power system dynamic studies. To solve this problem, the dynamic load model for the medium voltage cascaded H-bridge multi-level inverter drive and induction motor systems, which is suitable for power system dynamic studies, is proposed in this paper. Analytical formula of the model is presented. The model includes the aggregated effect of an MVD, an induction motor, and their control system, and thus, it can accurately represent the dynamic responses of the motor drive system under disturbances. Both voltage and frequency dependence are considered in the model. The accuracy of the model is verified by a case study. A sensitivity study is conducted to evaluate the impact of the model parameter variation on dynamic response characteristics. The developed load model can be readily inserted in the large-scale power system simulation software for power system dynamic studies.
{"title":"Load Model for Medium Voltage Cascaded H-Bridge Multi-Level Inverter Drive Systems","authors":"Xiaodong Liang, Jinwei He","doi":"10.1109/JPETS.2015.2508785","DOIUrl":"https://doi.org/10.1109/JPETS.2015.2508785","url":null,"abstract":"Medium voltage drives (MVDs) are commonly used in high-power applications and show significant impact on the overall system dynamics due to their large size and high power demand. Although detailed switching models for MVDs can be built using MATLAB/Simulink, such models cannot be used in large-scale simulation software for power system dynamic studies. To solve this problem, the dynamic load model for the medium voltage cascaded H-bridge multi-level inverter drive and induction motor systems, which is suitable for power system dynamic studies, is proposed in this paper. Analytical formula of the model is presented. The model includes the aggregated effect of an MVD, an induction motor, and their control system, and thus, it can accurately represent the dynamic responses of the motor drive system under disturbances. Both voltage and frequency dependence are considered in the model. The accuracy of the model is verified by a case study. A sensitivity study is conducted to evaluate the impact of the model parameter variation on dynamic response characteristics. The developed load model can be readily inserted in the large-scale power system simulation software for power system dynamic studies.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"174 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133600558","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 : 2016-01-06DOI: 10.1109/JPETS.2015.2501423
A. Fereidouni, M. Masoum, K. Smedley
This paper proposes a new constant frequency space-vector hysteresis-band current control (CF-SVHCC) in the stationary reference frame (SRF) for three-level active power filter applications when applied to isolated neutral point (INP) systems. CF-SVHCC is designed based on two recognized modulation methods: 1) space-vector modulation and 2) adaptive hysteresis current control. The proposed technique consists of a simple circular hysteresis strategy around the current-error vector in SRF with the purpose of employing the zero- and nonzero-voltage vectors of the three-level voltage source inverter. CF-SVHCC continuously estimates an adaptive outer hysteresis-band in the SRF using the inverter switching signals by a simple and fast artificial neural network method called the adaptive linear neuron algorithm. The main part of CF-SVHCC is a supervisory control unit that operates in the SRF to avoid interphase dependency and systematically uses the voltage vectors associated with the estimated outer hysteresis-band to prevent a high switching frequency and, in turn, maintain the switching frequency constant. CF-SVHCC retains most benefits of the conventional HCC and also introduces additional advantages, including a constant switching frequency and the interphases independency in three-phase INP systems.
{"title":"Supervisory Nearly Constant Frequency Hysteresis Current Control for Active Power Filter Applications in Stationary Reference Frame","authors":"A. Fereidouni, M. Masoum, K. Smedley","doi":"10.1109/JPETS.2015.2501423","DOIUrl":"https://doi.org/10.1109/JPETS.2015.2501423","url":null,"abstract":"This paper proposes a new constant frequency space-vector hysteresis-band current control (CF-SVHCC) in the stationary reference frame (SRF) for three-level active power filter applications when applied to isolated neutral point (INP) systems. CF-SVHCC is designed based on two recognized modulation methods: 1) space-vector modulation and 2) adaptive hysteresis current control. The proposed technique consists of a simple circular hysteresis strategy around the current-error vector in SRF with the purpose of employing the zero- and nonzero-voltage vectors of the three-level voltage source inverter. CF-SVHCC continuously estimates an adaptive outer hysteresis-band in the SRF using the inverter switching signals by a simple and fast artificial neural network method called the adaptive linear neuron algorithm. The main part of CF-SVHCC is a supervisory control unit that operates in the SRF to avoid interphase dependency and systematically uses the voltage vectors associated with the estimated outer hysteresis-band to prevent a high switching frequency and, in turn, maintain the switching frequency constant. CF-SVHCC retains most benefits of the conventional HCC and also introduces additional advantages, including a constant switching frequency and the interphases independency in three-phase INP systems.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122367893","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 : 2015-11-26DOI: 10.1109/JPETS.2015.2489863
Gefei Kou, Micah J. Till, T. Bilke, S. Hadley, Yilu Liu, T. King
This paper investigates the primary frequency response adequacy of the U.S. Eastern Interconnection with high-wind penetration in the year 2030. This paper starts with the creation of a realistic baseline dynamic model by validating against synchrophasor measurements. A dynamic simulation is performed to evaluate the impact of high-wind generation on a primary frequency response. Mitigation measures are then investigated.
{"title":"Primary Frequency Response Adequacy Study on the U.S. Eastern Interconnection Under High-Wind Penetration Conditions","authors":"Gefei Kou, Micah J. Till, T. Bilke, S. Hadley, Yilu Liu, T. King","doi":"10.1109/JPETS.2015.2489863","DOIUrl":"https://doi.org/10.1109/JPETS.2015.2489863","url":null,"abstract":"This paper investigates the primary frequency response adequacy of the U.S. Eastern Interconnection with high-wind penetration in the year 2030. This paper starts with the creation of a realistic baseline dynamic model by validating against synchrophasor measurements. A dynamic simulation is performed to evaluate the impact of high-wind generation on a primary frequency response. Mitigation measures are then investigated.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"239 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131653238","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 : 2015-10-06DOI: 10.1109/JPETS.2015.2477598
Y. Xiang, J. Cobben
This paper proposes a statistical approach for section-based fault location in medium voltage (MV) grids with underground cables, using Bayesian inference. The proposed approach considers several important uncertainties in the MV grid, including measurement errors, fault breakdown resistance, and the inaccuracies of zero-sequence parameters. The approach first obtains the prior distribution of the fault position from the component failure database, the readings of the transmitted fault indicators, and the relevant digging activity record. With the estimated prefault grid status and the measured transient voltages/currents, the posterior distribution is then calculated based on Bayes' theorem. To solve the problem numerically, the Monte Carlo integration is applied and a two-step calculation procedure is proposed. Simulations are performed on a typical European MV feeder to demonstrate the feasibility of the approach. The distribution grid operators can use the calculated posterior distribution to rank the possible faulted sections and to facilitate the restoration process, which can reduce the interruption duration of power supply.
{"title":"A Bayesian Approach for Fault Location in Medium Voltage Grids With Underground Cables","authors":"Y. Xiang, J. Cobben","doi":"10.1109/JPETS.2015.2477598","DOIUrl":"https://doi.org/10.1109/JPETS.2015.2477598","url":null,"abstract":"This paper proposes a statistical approach for section-based fault location in medium voltage (MV) grids with underground cables, using Bayesian inference. The proposed approach considers several important uncertainties in the MV grid, including measurement errors, fault breakdown resistance, and the inaccuracies of zero-sequence parameters. The approach first obtains the prior distribution of the fault position from the component failure database, the readings of the transmitted fault indicators, and the relevant digging activity record. With the estimated prefault grid status and the measured transient voltages/currents, the posterior distribution is then calculated based on Bayes' theorem. To solve the problem numerically, the Monte Carlo integration is applied and a two-step calculation procedure is proposed. Simulations are performed on a typical European MV feeder to demonstrate the feasibility of the approach. The distribution grid operators can use the calculated posterior distribution to rank the possible faulted sections and to facilitate the restoration process, which can reduce the interruption duration of power supply.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"14 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125763105","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 : 2015-09-01DOI: 10.1109/JPETS.2015.2448115
V. Murugesan, Y. Chakhchoukh, V. Vittal, G. Heydt, N. Logic, S. Sturgill
State estimation (SE) is a critical must run successful unit within energy management system software. This is dictated by the high reliability requirements for system security and control and the need to represent the closest real-time model for market operations. There has been considerable emphasis in bringing phasor measurements into SE to improve performance. However, there are many practical problems in incorporating phasor measurements into SE. The higher reporting rates of phasor measurement units compared with supervisory control and data acquisition devices is one such problem. The disparity of the reporting rates raises the question of whether buffering the phasor measurements helps to improve the state estimates. This buffer is a subset of the entire phasor measurements set relevant to every particular instant at which SE is conducted. This paper describes the design of an optimal buffer, the use of the phasor measurements from that buffer, and the analysis of the impact on SE with the inclusion of these buffered phasor measurements. This hybrid SE, used for analysis purposes, is created from contemporary real-time system data and measurements from a utility in southwest USA.
{"title":"PMU Data Buffering for Power System State Estimators","authors":"V. Murugesan, Y. Chakhchoukh, V. Vittal, G. Heydt, N. Logic, S. Sturgill","doi":"10.1109/JPETS.2015.2448115","DOIUrl":"https://doi.org/10.1109/JPETS.2015.2448115","url":null,"abstract":"State estimation (SE) is a critical must run successful unit within energy management system software. This is dictated by the high reliability requirements for system security and control and the need to represent the closest real-time model for market operations. There has been considerable emphasis in bringing phasor measurements into SE to improve performance. However, there are many practical problems in incorporating phasor measurements into SE. The higher reporting rates of phasor measurement units compared with supervisory control and data acquisition devices is one such problem. The disparity of the reporting rates raises the question of whether buffering the phasor measurements helps to improve the state estimates. This buffer is a subset of the entire phasor measurements set relevant to every particular instant at which SE is conducted. This paper describes the design of an optimal buffer, the use of the phasor measurements from that buffer, and the analysis of the impact on SE with the inclusion of these buffered phasor measurements. This hybrid SE, used for analysis purposes, is created from contemporary real-time system data and measurements from a utility in southwest USA.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123701287","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 : 2015-06-30DOI: 10.1109/JPETS.2015.2424700
Min Gan, Han-Xiong Li, C. L. P. Chen, Long Chen
This paper investigates a basic problem in modeling time series of wind data: whether there exists detectable correlation or nonlinearity in the observed wind time series. At present, a variety of linear and nonlinear time series models have been applied to predict the wind data. The first question that should be answered before building a model, however, is whether the data studied are correlated or carry nonlinearity. It would be futile to model the relationships if the pertaining wind data cannot be distinguished from the white noise. Advanced nonlinear prediction models are also not necessary if there are no nonlinear structures in the data. In this paper, we test by the surrogate data method: 1) whether the differenced wind speed time series (taking the first difference of the time series) is white noise, and 2) the presence of nonlinearity in the original wind speed time series. Nine data sets, including 10 min and hourly wind speed data, are examined. The results show that all of the differenced wind speed time series are correlated, and three out of the nine original wind speed time series satisfy the hypothesis of a linear stochastic generating process. It is concluded that for a specific wind speed time series, the nonlinearity is data-dependent from the perspective of practical time series analysis.
{"title":"A Potential Method for Determining Nonlinearity in Wind Data","authors":"Min Gan, Han-Xiong Li, C. L. P. Chen, Long Chen","doi":"10.1109/JPETS.2015.2424700","DOIUrl":"https://doi.org/10.1109/JPETS.2015.2424700","url":null,"abstract":"This paper investigates a basic problem in modeling time series of wind data: whether there exists detectable correlation or nonlinearity in the observed wind time series. At present, a variety of linear and nonlinear time series models have been applied to predict the wind data. The first question that should be answered before building a model, however, is whether the data studied are correlated or carry nonlinearity. It would be futile to model the relationships if the pertaining wind data cannot be distinguished from the white noise. Advanced nonlinear prediction models are also not necessary if there are no nonlinear structures in the data. In this paper, we test by the surrogate data method: 1) whether the differenced wind speed time series (taking the first difference of the time series) is white noise, and 2) the presence of nonlinearity in the original wind speed time series. Nine data sets, including 10 min and hourly wind speed data, are examined. The results show that all of the differenced wind speed time series are correlated, and three out of the nine original wind speed time series satisfy the hypothesis of a linear stochastic generating process. It is concluded that for a specific wind speed time series, the nonlinearity is data-dependent from the perspective of practical time series analysis.","PeriodicalId":170601,"journal":{"name":"IEEE Power and Energy Technology Systems Journal","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126950520","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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