Pub Date : 2010-11-09DOI: 10.1109/ICHQP.2010.5625481
Z. Staroszczyk
The development of invasive methods for power grid investigations is not easy as has to be made in comfortable conditions (laboratory equipped with instrumentation and enough computing power), while grid signals and experiments are accessible in field conditions. Ad hock planned invasive experiments during research development are dangerous to the power system and the software/hardware developer. The paper is focused on development of invasive methods of grid impedance determination with the use of experiment data supported simulations. Simulations form standard tool replacing difficult to access reality, however can not deliver enough detailed description of signals which exist in real power grids, and which affect impedance identification/determination DSP. In the paper the combined method for generating valuable signals, which describe the excited real grid, is proposed. The method needs passive (non-invasive) grid observations and enriches them with testing signals of the simulated grid. In such the approach the simulations are responsible only for impedance information, while observations deliver full information on the real grid signal properties. The usefulness of the method for impedance devoted DSP improvement was illustrated with the examples of a grid exciter development.
{"title":"Combined, experimental data supported simulations in development of power grid impedance identification methods","authors":"Z. Staroszczyk","doi":"10.1109/ICHQP.2010.5625481","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625481","url":null,"abstract":"The development of invasive methods for power grid investigations is not easy as has to be made in comfortable conditions (laboratory equipped with instrumentation and enough computing power), while grid signals and experiments are accessible in field conditions. Ad hock planned invasive experiments during research development are dangerous to the power system and the software/hardware developer. The paper is focused on development of invasive methods of grid impedance determination with the use of experiment data supported simulations. Simulations form standard tool replacing difficult to access reality, however can not deliver enough detailed description of signals which exist in real power grids, and which affect impedance identification/determination DSP. In the paper the combined method for generating valuable signals, which describe the excited real grid, is proposed. The method needs passive (non-invasive) grid observations and enriches them with testing signals of the simulated grid. In such the approach the simulations are responsible only for impedance information, while observations deliver full information on the real grid signal properties. The usefulness of the method for impedance devoted DSP improvement was illustrated with the examples of a grid exciter development.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":" 29","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132074332","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625322
D. A. Cumming
Today design, deployment, and operation of modern substations are changing significantly. IEC 61850 (61850)[1] leads the way, as a notably improved global standard. 61850 is the result of years of research by leading utility industry experts seeking to provide a universal standard addressing all significant aspects of modern substation communication. This paper supports 61850 as a worthy vehicle for providing power quality solutions to the industry while examining concepts for enhancing power quality aspects for improved functionality.
{"title":"Power quality enhancements for IEC 61850","authors":"D. A. Cumming","doi":"10.1109/ICHQP.2010.5625322","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625322","url":null,"abstract":"Today design, deployment, and operation of modern substations are changing significantly. IEC 61850 (61850)[1] leads the way, as a notably improved global standard. 61850 is the result of years of research by leading utility industry experts seeking to provide a universal standard addressing all significant aspects of modern substation communication. This paper supports 61850 as a worthy vehicle for providing power quality solutions to the industry while examining concepts for enhancing power quality aspects for improved functionality.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132364659","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625435
D. Shih, G. Chang, G. Chuang, H. L. Wang, S. Chu
This paper presents a fuzzy-based algorithm for the placement and sizing of shunt capacitor banks in a harmonics-polluted distribution system. In the problem the objective function is the total system power loss and the capacitor installation cost, while the constraints are the rms voltage, the individual and total harmonic voltage distortion limits at each bus, and the limit of the available capacitor units to be placed. In the study the power loss index associated with each bus, the rms voltage, the individual and total harmonic voltage distortions at each bus, and the capacitor site suitability are modeled as fuzzy membership functions. A useful solution algorithm is then proposed to find the most suitable capacitor locations and corresponding sizes for an actual distribution network. Results obtained by the proposed approach are compared with those obtained by a traditional nonlinear programming method and a maximum sensitivity-based approach. Numerical experiences show that the proposed method yields favorable results for the capacitor planning problem.
{"title":"A fuzzy-based algorithm for shunt capacitor planning in a distorted power system","authors":"D. Shih, G. Chang, G. Chuang, H. L. Wang, S. Chu","doi":"10.1109/ICHQP.2010.5625435","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625435","url":null,"abstract":"This paper presents a fuzzy-based algorithm for the placement and sizing of shunt capacitor banks in a harmonics-polluted distribution system. In the problem the objective function is the total system power loss and the capacitor installation cost, while the constraints are the rms voltage, the individual and total harmonic voltage distortion limits at each bus, and the limit of the available capacitor units to be placed. In the study the power loss index associated with each bus, the rms voltage, the individual and total harmonic voltage distortions at each bus, and the capacitor site suitability are modeled as fuzzy membership functions. A useful solution algorithm is then proposed to find the most suitable capacitor locations and corresponding sizes for an actual distribution network. Results obtained by the proposed approach are compared with those obtained by a traditional nonlinear programming method and a maximum sensitivity-based approach. Numerical experiences show that the proposed method yields favorable results for the capacitor planning problem.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"503 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132560777","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625488
H. Dalvand, V. Agelidis
This paper proposes a time-domain technique in order to meter the power quantities of three-phase systems that are contained in IEEE Standard 1459–2000. The proposed method does not need the spectral analysis which is the base of time-frequency methods. It is based on a recursive implementation of the Park and Clark transformations that are employed to obtain the fundamental components of voltage and currents waveforms to calculate the powers of three-phase systems in every distributed network whether sinusoidal, non-sinusoidal, balanced or unbalanced. The recursive algorithm avoids the low-pass filtering stage that in turn results in uncertainty and delay in calculating the fundamental components of the waveforms in synchronous rotating frame. To investigate the effectiveness of the proposed method, it is compared to the Direct Park-based methods in calculating the quantities. In implementation of this technique, the effects of voltage and current transducers are considered as well. According to the simulation and implementation results, the real-time method can calculate the power quantities with less delay and more accuracy.
{"title":"Real-time measurement of power quantities in fully distorted systems","authors":"H. Dalvand, V. Agelidis","doi":"10.1109/ICHQP.2010.5625488","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625488","url":null,"abstract":"This paper proposes a time-domain technique in order to meter the power quantities of three-phase systems that are contained in IEEE Standard 1459–2000. The proposed method does not need the spectral analysis which is the base of time-frequency methods. It is based on a recursive implementation of the Park and Clark transformations that are employed to obtain the fundamental components of voltage and currents waveforms to calculate the powers of three-phase systems in every distributed network whether sinusoidal, non-sinusoidal, balanced or unbalanced. The recursive algorithm avoids the low-pass filtering stage that in turn results in uncertainty and delay in calculating the fundamental components of the waveforms in synchronous rotating frame. To investigate the effectiveness of the proposed method, it is compared to the Direct Park-based methods in calculating the quantities. In implementation of this technique, the effects of voltage and current transducers are considered as well. According to the simulation and implementation results, the real-time method can calculate the power quantities with less delay and more accuracy.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130122279","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625496
V. Barrera Nunez, I. Gu, M. Bollen, J. Meléndez
This paper addresses the problem of extracting effective features for the analysis of underlying causes of power quality (PQ) disturbances. For each underlying cause, we define and extract a set of features based on analysis of voltage/current waveforms or the combination of them. The proposed feature sets are then used for building a rule-based classification framework for automatic identification of the underlying causes stored in PQ databases. These rules are based on the extracted features. Using the proposed features and rules, the proposed classifier has yielded a correct classification rate of 95.8% for a total of 96 disturbance sequences, demonstrating a high accuracy distinguishing between the different underlying causes in PQ events.
{"title":"Feature characterization of power quality events according to their underlying causes","authors":"V. Barrera Nunez, I. Gu, M. Bollen, J. Meléndez","doi":"10.1109/ICHQP.2010.5625496","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625496","url":null,"abstract":"This paper addresses the problem of extracting effective features for the analysis of underlying causes of power quality (PQ) disturbances. For each underlying cause, we define and extract a set of features based on analysis of voltage/current waveforms or the combination of them. The proposed feature sets are then used for building a rule-based classification framework for automatic identification of the underlying causes stored in PQ databases. These rules are based on the extracted features. Using the proposed features and rules, the proposed classifier has yielded a correct classification rate of 95.8% for a total of 96 disturbance sequences, demonstrating a high accuracy distinguishing between the different underlying causes in PQ events.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130197700","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625335
L. Herman, I. Papič
Due to the presence of large number of reactive power compensators at different voltage levels in a typical industrial network, many combinations of the settings of compensators are possible, all of which are not appropriate in terms of harmonic conditions in the network. Thus, it is rather hard for an operator to make an optimal decision how to operate and predict all of the potentially dangerous situations. The most dangerous resonance conditions are those which occur in the vicinity of the harmonic components present in the network. For save and reliable operation it is thus necessary to prevent such conditions from happening. In this paper a concept of virtual compensator is proposed, addressing the above issues of reactive power compensation in industrial networks. An algorithm is introduced, which resolves alternatives for each operating point and provides to the operator the optimal combination of setting to be implemented. The effectiveness of the proposed algorithm is demonstrated on the realistic industrial network model by means of simulation.
{"title":"Optimal control of reactive power compensators in industrial networks","authors":"L. Herman, I. Papič","doi":"10.1109/ICHQP.2010.5625335","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625335","url":null,"abstract":"Due to the presence of large number of reactive power compensators at different voltage levels in a typical industrial network, many combinations of the settings of compensators are possible, all of which are not appropriate in terms of harmonic conditions in the network. Thus, it is rather hard for an operator to make an optimal decision how to operate and predict all of the potentially dangerous situations. The most dangerous resonance conditions are those which occur in the vicinity of the harmonic components present in the network. For save and reliable operation it is thus necessary to prevent such conditions from happening. In this paper a concept of virtual compensator is proposed, addressing the above issues of reactive power compensation in industrial networks. An algorithm is introduced, which resolves alternatives for each operating point and provides to the operator the optimal combination of setting to be implemented. The effectiveness of the proposed algorithm is demonstrated on the realistic industrial network model by means of simulation.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"54 96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116707069","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625342
C. H. da Silva, R. Pereira, L. D. da Silva, G. L. Torres, R. Gonzatti
This paper describes the technique developed to charge and to regulate the hybrid active power filter link DC. The developed strategy is based on the Modified Synchronous Reference Frame Controller. The ability of the hybrid topology in charging and regulating its own Link DC without external sources connection is analyzed. The accuracy and the dynamics are presented, and the measurements of active power demand to perform the task are evaluated. Practical results exhibits the non-active power demanded to charge the Link DC capacitor and the absence of ripple in DC capacitor Voltage. The algorithm is executed in the DSP TMS320F2812 and the inverter switching frequency is 20 kHz.
{"title":"Charging and regulating the DC link voltage of hybrid active series power filters","authors":"C. H. da Silva, R. Pereira, L. D. da Silva, G. L. Torres, R. Gonzatti","doi":"10.1109/ICHQP.2010.5625342","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625342","url":null,"abstract":"This paper describes the technique developed to charge and to regulate the hybrid active power filter link DC. The developed strategy is based on the Modified Synchronous Reference Frame Controller. The ability of the hybrid topology in charging and regulating its own Link DC without external sources connection is analyzed. The accuracy and the dynamics are presented, and the measurements of active power demand to perform the task are evaluated. Practical results exhibits the non-active power demanded to charge the Link DC capacitor and the absence of ripple in DC capacitor Voltage. The algorithm is executed in the DSP TMS320F2812 and the inverter switching frequency is 20 kHz.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133926612","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625479
R. Carbone, R. Langella, A. Testa
Billing of the electrical energy consumed and generated by prosumers (producers-consumers), in presence of unbalanced and distorted conditions at an interconnecting busbar, is considered. Reference is made to the case of PhotoVoltaic (PV) generation and to the Italian incentive policy, named “Conto-Energia”. Some possible evolutions of the present billing policy basing on metrics introduced by IEEE Standard 1459 and derived from the sequence component theory application are traced. Numerical results on a prosumer's busbar with an internal PV plant are discussed.
{"title":"On the billing of electrical energy flows at prosumers' busbar","authors":"R. Carbone, R. Langella, A. Testa","doi":"10.1109/ICHQP.2010.5625479","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625479","url":null,"abstract":"Billing of the electrical energy consumed and generated by prosumers (producers-consumers), in presence of unbalanced and distorted conditions at an interconnecting busbar, is considered. Reference is made to the case of PhotoVoltaic (PV) generation and to the Italian incentive policy, named “Conto-Energia”. Some possible evolutions of the present billing policy basing on metrics introduced by IEEE Standard 1459 and derived from the sequence component theory application are traced. Numerical results on a prosumer's busbar with an internal PV plant are discussed.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"527 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132385727","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625370
M. de Ápraiz, J. Barros, R. Diego
This paper presents a laboratory for time-frequency analysis of power quality disturbances using wavelets. Wavelet-packet transform is applied to simulated or real disturbance records previously recorded by power quality monitoring equipment using different mother wavelet function, sampling frequency and different wavelet decomposition trees, computing the magnitude, mean and standard deviation, number of peaks, energy or entropy of the output coefficients at different resolution levels for extraction of the distinctive features of power quality disturbances.
{"title":"A laboratory for time-frequency analysis of power quality disturbances using wavelets","authors":"M. de Ápraiz, J. Barros, R. Diego","doi":"10.1109/ICHQP.2010.5625370","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625370","url":null,"abstract":"This paper presents a laboratory for time-frequency analysis of power quality disturbances using wavelets. Wavelet-packet transform is applied to simulated or real disturbance records previously recorded by power quality monitoring equipment using different mother wavelet function, sampling frequency and different wavelet decomposition trees, computing the magnitude, mean and standard deviation, number of peaks, energy or entropy of the output coefficients at different resolution levels for extraction of the distinctive features of power quality disturbances.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123773324","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 : 2010-11-09DOI: 10.1109/ICHQP.2010.5625501
S. Elphick, V. Smith, V. Gosbell, R. Barr
The Australian Long Term National Power Quality Survey (LTNPQS) is a large multi-utility power quality survey which has now been in operation for 8 years. This paper details the latest innovative developments in the reporting and analysis procedures developed for the LTNPQS. The paper also highlights the key power quality issues affecting Australian electricity networks at the present time. These include high voltage levels at LV sites and difficulties in measurement of voltage unbalance. The longevity of the survey has allowed better understanding of disturbance trend levels. Interesting results include an apparent reduction in harmonic levels in the past couple of years and no definite trend in sag levels even with 7 years worth of data. Some of the challenges involved in conducting a survey of this type are explored and indications as to solutions presented. With the implementation of smart grid concepts it is likely that the number of sites with instrumentation capable of supplying data to the survey will increase exponentially. This presents a new set of challenges and the survey must adapt to these. Future directions taken in response include the implementation of web-based reporting systems which will provide more flexibility for participants.
{"title":"The Australian Long Term Power Quality Survey project update","authors":"S. Elphick, V. Smith, V. Gosbell, R. Barr","doi":"10.1109/ICHQP.2010.5625501","DOIUrl":"https://doi.org/10.1109/ICHQP.2010.5625501","url":null,"abstract":"The Australian Long Term National Power Quality Survey (LTNPQS) is a large multi-utility power quality survey which has now been in operation for 8 years. This paper details the latest innovative developments in the reporting and analysis procedures developed for the LTNPQS. The paper also highlights the key power quality issues affecting Australian electricity networks at the present time. These include high voltage levels at LV sites and difficulties in measurement of voltage unbalance. The longevity of the survey has allowed better understanding of disturbance trend levels. Interesting results include an apparent reduction in harmonic levels in the past couple of years and no definite trend in sag levels even with 7 years worth of data. Some of the challenges involved in conducting a survey of this type are explored and indications as to solutions presented. With the implementation of smart grid concepts it is likely that the number of sites with instrumentation capable of supplying data to the survey will increase exponentially. This presents a new set of challenges and the survey must adapt to these. Future directions taken in response include the implementation of web-based reporting systems which will provide more flexibility for participants.","PeriodicalId":180078,"journal":{"name":"Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124711849","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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