With the rapid increasing of resident photovoltaics, the power utility is hard to effectively manage them, and the voltage at the end of the feeder always exceed the voltage limit. This paper takes the National Key Research and Developing Program—Jinzhai Photovoltaic Demonstration Project as an example, and a dispatching device is developed and installed on the low voltage side of 10kV/380V transformer, which is equipped with a telecontrol dispatching strategy with communication and a local adaptive control strategy without communication. The dispatching strategy mainly aims at the master station instructions, improving the generation capacity of distributed photovoltaics. The local adaptive strategy controls the voltage not exceed limits. Through the active power and reactive power coordinated control of the photovoltaic and energy storage system(ESS), the utility can control the power generation of PVs and the local voltage is optimized. Simulation validates feasibility and effectiveness of the proposed method.
{"title":"Low-Voltage Distribution Network Dispatching Strategy for High Proportion of Distributed Photovoltaic-Energy Storage System","authors":"Jinghan He, Kun Zhao, Pinghao Ni, Liufang Wang, Wei Li, Hongbo Chen","doi":"10.1109/CIEEC.2018.8745860","DOIUrl":"https://doi.org/10.1109/CIEEC.2018.8745860","url":null,"abstract":"With the rapid increasing of resident photovoltaics, the power utility is hard to effectively manage them, and the voltage at the end of the feeder always exceed the voltage limit. This paper takes the National Key Research and Developing Program—Jinzhai Photovoltaic Demonstration Project as an example, and a dispatching device is developed and installed on the low voltage side of 10kV/380V transformer, which is equipped with a telecontrol dispatching strategy with communication and a local adaptive control strategy without communication. The dispatching strategy mainly aims at the master station instructions, improving the generation capacity of distributed photovoltaics. The local adaptive strategy controls the voltage not exceed limits. Through the active power and reactive power coordinated control of the photovoltaic and energy storage system(ESS), the utility can control the power generation of PVs and the local voltage is optimized. Simulation validates feasibility and effectiveness of the proposed method.","PeriodicalId":329285,"journal":{"name":"2018 IEEE 2nd International Electrical and Energy Conference (CIEEC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123204879","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 : 2018-11-01DOI: 10.1109/CIEEC.2018.8745947
Song Zhang, Yushun Zhao, Kerong Yang, Xuepei Wang
In order to study and analyze the aging mechanism of epoxy resin, the aging characteristics of epoxy resin were studied by molecular dynamics. Firstly, the curing and crosslinking of bisphenol A epoxy resin with tetrahydrophthalic anhydride (THPA) with good electrical properties was carried out. Then, the aging process of epoxy resin molecular chain was studied by molecular dynamics simulation, and it was verified by infrared spectrum and the bond length distribution of molecular chains. The results show that chemical bond breaking occurs in the aging process of epoxy resin, and small molecular segments are produced, resulting in the decline of mechanical properties of epoxy resin. The epoxy resin will produce H2O, free hydroxyl groups and free hydrogens in the aging process. Free hydroxyl groups and free hydrogens can recombine to form H2O, and H2O will lead to a decline in insulation properties of the epoxy resin. The infrared spectrum curves of epoxy resin in aging and non-aging models show that the benzene rings in epoxy resin are stable, and the positions of breaking chemical bonds are mainly concentrated on ether bonds. The bond length distribution curves of epoxy resin in aging and non-aging models show that the peak values of carbon-oxygen bonds and carbon-hydrogen bonds are obviously different, and it indirectly verifies the breaking and formation of chemical bonds in the aging process of epoxy resin.
{"title":"Study on Aging Mechanism of Bisphenol A Epoxy Resin Based on Molecular Simulation","authors":"Song Zhang, Yushun Zhao, Kerong Yang, Xuepei Wang","doi":"10.1109/CIEEC.2018.8745947","DOIUrl":"https://doi.org/10.1109/CIEEC.2018.8745947","url":null,"abstract":"In order to study and analyze the aging mechanism of epoxy resin, the aging characteristics of epoxy resin were studied by molecular dynamics. Firstly, the curing and crosslinking of bisphenol A epoxy resin with tetrahydrophthalic anhydride (THPA) with good electrical properties was carried out. Then, the aging process of epoxy resin molecular chain was studied by molecular dynamics simulation, and it was verified by infrared spectrum and the bond length distribution of molecular chains. The results show that chemical bond breaking occurs in the aging process of epoxy resin, and small molecular segments are produced, resulting in the decline of mechanical properties of epoxy resin. The epoxy resin will produce H2O, free hydroxyl groups and free hydrogens in the aging process. Free hydroxyl groups and free hydrogens can recombine to form H2O, and H2O will lead to a decline in insulation properties of the epoxy resin. The infrared spectrum curves of epoxy resin in aging and non-aging models show that the benzene rings in epoxy resin are stable, and the positions of breaking chemical bonds are mainly concentrated on ether bonds. The bond length distribution curves of epoxy resin in aging and non-aging models show that the peak values of carbon-oxygen bonds and carbon-hydrogen bonds are obviously different, and it indirectly verifies the breaking and formation of chemical bonds in the aging process of epoxy resin.","PeriodicalId":329285,"journal":{"name":"2018 IEEE 2nd International Electrical and Energy Conference (CIEEC)","volume":"134 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131591412","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}
The high temperature superconducting shield is primarily ceramic, and has high brittleness. In practice, there may be a slit, which may easily cause electromagnetic wave leakage. The research purpose is to identify a suitable repair solution for slits on superconducting magnetic shields. Firstly, slits on the YBCO magnetic shield are repaired by using four methods of using iron or copper materials directly filling and externally covering a hollow cylindrical iron or copper shield. Then, shielding effectiveness and repair efficiency of the YBCO shield are compared. It is noted that the frequency of the excitation source, the location of the slit and the repairing method all affect the repair effect of the magnetic shield. The results show that at low frequencies, the YBCO shield with slits is repaired with a hollow cylindrical shield of iron material on the outer cover and at the high frequency, the outer cover of the YBCO shield with slits is the hollow cylindrical shield repair of the copper material greatly improves the shielding effectiveness of the YBCO magnetic shield.
{"title":"Research on Characteristics of Superconducting Magnetic Shield Repair Technology","authors":"Wanying Zhang, Tingting Luo, Wanneng Zhu, Hongzhe Shen, Shoudao Huang","doi":"10.1109/CIEEC.2018.8745991","DOIUrl":"https://doi.org/10.1109/CIEEC.2018.8745991","url":null,"abstract":"The high temperature superconducting shield is primarily ceramic, and has high brittleness. In practice, there may be a slit, which may easily cause electromagnetic wave leakage. The research purpose is to identify a suitable repair solution for slits on superconducting magnetic shields. Firstly, slits on the YBCO magnetic shield are repaired by using four methods of using iron or copper materials directly filling and externally covering a hollow cylindrical iron or copper shield. Then, shielding effectiveness and repair efficiency of the YBCO shield are compared. It is noted that the frequency of the excitation source, the location of the slit and the repairing method all affect the repair effect of the magnetic shield. The results show that at low frequencies, the YBCO shield with slits is repaired with a hollow cylindrical shield of iron material on the outer cover and at the high frequency, the outer cover of the YBCO shield with slits is the hollow cylindrical shield repair of the copper material greatly improves the shielding effectiveness of the YBCO magnetic shield.","PeriodicalId":329285,"journal":{"name":"2018 IEEE 2nd International Electrical and Energy Conference (CIEEC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128354276","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 : 2018-11-01DOI: 10.1109/CIEEC.2018.8745866
Xing Chen, Yin Xu, Jinghan He
Large-scale AC-DC hybrid power systems have become a basic pattern for power transmission in China. Currently, time-domain simulation is widely used for transient stability analysis, which has the disadvantages of high computational burdens and lack of system stability margin information. An alternative method for transient stability analysis is the direct method, which assesses transient stability from the energy point of view. Direct method requires much less computation efforts. In addition, the stability margin of the system can be obtained. Due to the challenges in system modelling, energy function construction, and determination of critical energy value, it is challenging to apply direct method for transient stability analysis of AC-DC hybrid power systems. This paper is a step in exploring the application of direct method in AC-DC hybrid power systems.
{"title":"Transient Stability Analysis of AC-DC Hybrid Power Systems Using Direct Method","authors":"Xing Chen, Yin Xu, Jinghan He","doi":"10.1109/CIEEC.2018.8745866","DOIUrl":"https://doi.org/10.1109/CIEEC.2018.8745866","url":null,"abstract":"Large-scale AC-DC hybrid power systems have become a basic pattern for power transmission in China. Currently, time-domain simulation is widely used for transient stability analysis, which has the disadvantages of high computational burdens and lack of system stability margin information. An alternative method for transient stability analysis is the direct method, which assesses transient stability from the energy point of view. Direct method requires much less computation efforts. In addition, the stability margin of the system can be obtained. Due to the challenges in system modelling, energy function construction, and determination of critical energy value, it is challenging to apply direct method for transient stability analysis of AC-DC hybrid power systems. This paper is a step in exploring the application of direct method in AC-DC hybrid power systems.","PeriodicalId":329285,"journal":{"name":"2018 IEEE 2nd International Electrical and Energy Conference (CIEEC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124652545","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}
Due to the existence of inductive current and time-varying electromagnetic field in high power wireless power transfer (WPT) system, the coupling mechanism inevitably be affected by electromagnetic force, which has negative effects on the stability and the life of the system. The electromagnetic force of different structural systems is varied, due to the change of magnetic field. In this paper, the numerical solution of the electromagnetic force of the WPT system is presented based on Lorentz-Kelvin force density method. Then, an equivalent finite element model is built to study the influence of structural parameters on the electromagnetic force by parameterized solution, and the effects of magnetic permeability, coil turns and turn spacing on electromagnetic force are obtained, respectively. The laws are helpful for the design and the optimization of the WPT system.
{"title":"Research on the Influence of Structural Parameters on Electromagnetic Force of Wireless Power Transfer","authors":"Xian Zhang, Xuejing Ni, Qingxin Yang, Bin Wei, Songcen Wang, Xiaokang Wu","doi":"10.1109/CIEEC.2018.8745869","DOIUrl":"https://doi.org/10.1109/CIEEC.2018.8745869","url":null,"abstract":"Due to the existence of inductive current and time-varying electromagnetic field in high power wireless power transfer (WPT) system, the coupling mechanism inevitably be affected by electromagnetic force, which has negative effects on the stability and the life of the system. The electromagnetic force of different structural systems is varied, due to the change of magnetic field. In this paper, the numerical solution of the electromagnetic force of the WPT system is presented based on Lorentz-Kelvin force density method. Then, an equivalent finite element model is built to study the influence of structural parameters on the electromagnetic force by parameterized solution, and the effects of magnetic permeability, coil turns and turn spacing on electromagnetic force are obtained, respectively. The laws are helpful for the design and the optimization of the WPT system.","PeriodicalId":329285,"journal":{"name":"2018 IEEE 2nd International Electrical and Energy Conference (CIEEC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124677100","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 : 2018-11-01DOI: 10.1109/CIEEC.2018.8745959
Jiaxu Li, Yin Xu, Ying Wang
After a major outage caused by extreme events, critical loads can be restored by distributed generators (DGs) in the distribution system. The critical load restoration problem can be formulated as a mixed-integer semidefinite program (MISDP) to model the multi-phase unbalance of the distribution system, but MISDP cannot be solved efficiently. This paper proposes a mixed-integer linear program (MILP) for critical load restoration problem based on linear approximation of power flow, which is a good estimate of nonlinear unbalanced power flow and can be solved efficiently using off-the-shelf optimization tools. In addition, to consider the operation of the post-restoration system during the outage, we extend the proposed MILP to a multi-time restoration model by adding additional time-related constraints. The accuracy and efficiency of the proposed one-snapshot restoration model are validated by numerical simulations on IEEE 13, 34, 37 and 123- node test feeders, and the effectiveness of the multi-time restoration model is demonstrated on IEEE 37-node test feeder.
{"title":"Critical Load Restoration Method for Unbalanced Distribution Systems Based on Linear Approximation","authors":"Jiaxu Li, Yin Xu, Ying Wang","doi":"10.1109/CIEEC.2018.8745959","DOIUrl":"https://doi.org/10.1109/CIEEC.2018.8745959","url":null,"abstract":"After a major outage caused by extreme events, critical loads can be restored by distributed generators (DGs) in the distribution system. The critical load restoration problem can be formulated as a mixed-integer semidefinite program (MISDP) to model the multi-phase unbalance of the distribution system, but MISDP cannot be solved efficiently. This paper proposes a mixed-integer linear program (MILP) for critical load restoration problem based on linear approximation of power flow, which is a good estimate of nonlinear unbalanced power flow and can be solved efficiently using off-the-shelf optimization tools. In addition, to consider the operation of the post-restoration system during the outage, we extend the proposed MILP to a multi-time restoration model by adding additional time-related constraints. The accuracy and efficiency of the proposed one-snapshot restoration model are validated by numerical simulations on IEEE 13, 34, 37 and 123- node test feeders, and the effectiveness of the multi-time restoration model is demonstrated on IEEE 37-node test feeder.","PeriodicalId":329285,"journal":{"name":"2018 IEEE 2nd International Electrical and Energy Conference (CIEEC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132438242","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 : 2018-11-01DOI: 10.1109/CIEEC.2018.8745778
J. Wen, Siqi Bus
The injection of renewable energy brings a big uncertainty to the modern power system, which would have a detrimental influence on the frequency stability. The fluctuating frequency from a specific wind farm is difficult to be represented by system average frequency due to uneven inertia distribution in the system. In order to deal with this issue, the coherency identification is applied to separate the system into a few areas and then further research is conducted. In terms of frequency stability analysis, two factors are often concerned: the rate of change of frequency (RoCoF) and frequency nadir/vertex (FN/FV). Therefore, this paper proposes a novel assessment index, i.e. Max Spatial Distribution Ratio of System Frequency Response (MaDSR), suitable for these two factors to evaluate the effects of the coherent results based on a new concept, Area Frequency Response Center (AFRC). To test the effectiveness of the index, slow coherency identification method is selected to divide a modified IEEE 16machine 68 bus with additional installation of wind farms.
{"title":"Performance Evaluation of Coherency Identification Methods in Frequency Stability Analysis Based on A Novel Assessment Index","authors":"J. Wen, Siqi Bus","doi":"10.1109/CIEEC.2018.8745778","DOIUrl":"https://doi.org/10.1109/CIEEC.2018.8745778","url":null,"abstract":"The injection of renewable energy brings a big uncertainty to the modern power system, which would have a detrimental influence on the frequency stability. The fluctuating frequency from a specific wind farm is difficult to be represented by system average frequency due to uneven inertia distribution in the system. In order to deal with this issue, the coherency identification is applied to separate the system into a few areas and then further research is conducted. In terms of frequency stability analysis, two factors are often concerned: the rate of change of frequency (RoCoF) and frequency nadir/vertex (FN/FV). Therefore, this paper proposes a novel assessment index, i.e. Max Spatial Distribution Ratio of System Frequency Response (MaDSR), suitable for these two factors to evaluate the effects of the coherent results based on a new concept, Area Frequency Response Center (AFRC). To test the effectiveness of the index, slow coherency identification method is selected to divide a modified IEEE 16machine 68 bus with additional installation of wind farms.","PeriodicalId":329285,"journal":{"name":"2018 IEEE 2nd International Electrical and Energy Conference (CIEEC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130734707","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 : 2018-11-01DOI: 10.1109/CIEEC.2018.8745902
Yang Xu, Fengbo Tao, Tianxi Xie, Zhaohui Zhang, Shu Chen, Jiangtao Xu
This paper studies the insulation coordination technology of UPFC system based on the 500 kV Suzhou UPFC. Firstly, the insulation coordination characteristics, methods and principles suitable for UPFC are proposed. Then the layout scheme of 500kV UPFC arresters is designed. Thirdly, to verify the insulation coordination design, the lightning overvoltage model and internal overvoltage model of UPFC are established. The transient overvoltage and lightning overvoltage is calculated, which proves the proposed insulation design. The insulation coordination method in this paper can provide an important reference for UPFC system.
{"title":"Research on Insulation Coordination of 500kV Unified Power Flow Controller","authors":"Yang Xu, Fengbo Tao, Tianxi Xie, Zhaohui Zhang, Shu Chen, Jiangtao Xu","doi":"10.1109/CIEEC.2018.8745902","DOIUrl":"https://doi.org/10.1109/CIEEC.2018.8745902","url":null,"abstract":"This paper studies the insulation coordination technology of UPFC system based on the 500 kV Suzhou UPFC. Firstly, the insulation coordination characteristics, methods and principles suitable for UPFC are proposed. Then the layout scheme of 500kV UPFC arresters is designed. Thirdly, to verify the insulation coordination design, the lightning overvoltage model and internal overvoltage model of UPFC are established. The transient overvoltage and lightning overvoltage is calculated, which proves the proposed insulation design. The insulation coordination method in this paper can provide an important reference for UPFC system.","PeriodicalId":329285,"journal":{"name":"2018 IEEE 2nd International Electrical and Energy Conference (CIEEC)","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115090065","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 : 2018-11-01DOI: 10.1109/CIEEC.2018.8745907
Arman Ali, Nian Liu, Hasan Saeed Qazi, Bowen Ou
Considering the needs for the future smart grids to precisely estimate the energy demand of a consumer, a fuzzy-logic based method is adopted in this paper that provides a comprehensive ground for planning and scheduling of the equipment or load. This method of estimation covers the most important aspect i.e. the uncertainty which is inherently associated with the forecasted data. The Fuzzy logic system helps the smart grid operator to estimate the data more accurately by defining the extent to which a certain value is true or false, which in other words known as the degree of truth. For this purpose, a proposed method is implemented on a real-life data that demonstrates the effectiveness of the method.
{"title":"Energy Demand Estimation of a Multi-Party Consumer using Fuzzy Logic Method","authors":"Arman Ali, Nian Liu, Hasan Saeed Qazi, Bowen Ou","doi":"10.1109/CIEEC.2018.8745907","DOIUrl":"https://doi.org/10.1109/CIEEC.2018.8745907","url":null,"abstract":"Considering the needs for the future smart grids to precisely estimate the energy demand of a consumer, a fuzzy-logic based method is adopted in this paper that provides a comprehensive ground for planning and scheduling of the equipment or load. This method of estimation covers the most important aspect i.e. the uncertainty which is inherently associated with the forecasted data. The Fuzzy logic system helps the smart grid operator to estimate the data more accurately by defining the extent to which a certain value is true or false, which in other words known as the degree of truth. For this purpose, a proposed method is implemented on a real-life data that demonstrates the effectiveness of the method.","PeriodicalId":329285,"journal":{"name":"2018 IEEE 2nd International Electrical and Energy Conference (CIEEC)","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114646845","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 : 2018-11-01DOI: 10.1109/CIEEC.2018.8745898
Guo Hehong, Yan Xiaohong, Guo Zun, Zhao Qingsheng, Zhang Jie, Wang Xuping
In the case of power signal frequency deviation, traditional discrete Fourier transform (discrete Fourier transformation, DFT) is used to realize synchronous phasor measurement, which will cause fence effect and spectrum leakage, and seriously reduce the accuracy of the calculation. For this reason, an improved modified DFT algorithm for phasor measurement is proposed in this paper. Firstly, the frequency tracking algorithm is introduced, which is used to calculate fundamental frequency. Then the DFT error mechanism in the non-synchronous sampling is analyzed. The functional relation between the amplitude and phase errors and frequency deviation is obtained. A method of reducing spectrum leakage is proposed and the amplitude and phase errors expressions are improved. Finally the performance of the algorithm is tested by different signal models and actual data. The simulation results show that the proposed algorithm meets the accuracy requirements of synchronized phasor measurement.
{"title":"Algorithm of DFT Phasor Measurement based on Frequency Tracking","authors":"Guo Hehong, Yan Xiaohong, Guo Zun, Zhao Qingsheng, Zhang Jie, Wang Xuping","doi":"10.1109/CIEEC.2018.8745898","DOIUrl":"https://doi.org/10.1109/CIEEC.2018.8745898","url":null,"abstract":"In the case of power signal frequency deviation, traditional discrete Fourier transform (discrete Fourier transformation, DFT) is used to realize synchronous phasor measurement, which will cause fence effect and spectrum leakage, and seriously reduce the accuracy of the calculation. For this reason, an improved modified DFT algorithm for phasor measurement is proposed in this paper. Firstly, the frequency tracking algorithm is introduced, which is used to calculate fundamental frequency. Then the DFT error mechanism in the non-synchronous sampling is analyzed. The functional relation between the amplitude and phase errors and frequency deviation is obtained. A method of reducing spectrum leakage is proposed and the amplitude and phase errors expressions are improved. Finally the performance of the algorithm is tested by different signal models and actual data. The simulation results show that the proposed algorithm meets the accuracy requirements of synchronized phasor measurement.","PeriodicalId":329285,"journal":{"name":"2018 IEEE 2nd International Electrical and Energy Conference (CIEEC)","volume":"102 Suppl 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132937114","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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