Pub Date : 2019-03-01DOI: 10.1109/ICGEA.2019.8880742
Yang Qing, Luo Li, Gu Bing, Tao Dingfeng, Wang Yunzhong, Zhu Xi
As an effective approach of testing corona discharge, UV imaging technology is non-contact, sensitive and intuitive, thus with a bright application prospect in the fault detection of electric apparatus. Currently, the strength of corona discharge is usually represented by the photon number output by UV imager, but in field service, it is difficult to accurately determine and quantitatively control the measuring distance. As a result, the different detection results of photon number are less comparable. This paper first deduces the relationship between the image height of substation electric apparatus and the actual number of UV photons by establishing a model for actual UV photons calculating, and then obtains the statistical results of UV photons of insulators and grading rings in time of different measuring distances and image heights by conducting the field UV corona test. Finally, a new method of checking the actual photons of UV corona is proposed according to the proposed model and field test data. According to the research results, the checking of actual photon number after taking the image height of electric apparatus into account may effectively eliminate the impact of measuring distance during field UV detection.
{"title":"Study on a New Method of Checking the Actual UV Photon Number of Substation Electric Apparatus","authors":"Yang Qing, Luo Li, Gu Bing, Tao Dingfeng, Wang Yunzhong, Zhu Xi","doi":"10.1109/ICGEA.2019.8880742","DOIUrl":"https://doi.org/10.1109/ICGEA.2019.8880742","url":null,"abstract":"As an effective approach of testing corona discharge, UV imaging technology is non-contact, sensitive and intuitive, thus with a bright application prospect in the fault detection of electric apparatus. Currently, the strength of corona discharge is usually represented by the photon number output by UV imager, but in field service, it is difficult to accurately determine and quantitatively control the measuring distance. As a result, the different detection results of photon number are less comparable. This paper first deduces the relationship between the image height of substation electric apparatus and the actual number of UV photons by establishing a model for actual UV photons calculating, and then obtains the statistical results of UV photons of insulators and grading rings in time of different measuring distances and image heights by conducting the field UV corona test. Finally, a new method of checking the actual photons of UV corona is proposed according to the proposed model and field test data. According to the research results, the checking of actual photon number after taking the image height of electric apparatus into account may effectively eliminate the impact of measuring distance during field UV detection.","PeriodicalId":170713,"journal":{"name":"2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117153342","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 : 2019-03-01DOI: 10.1109/ICGEA.2019.8880729
Q. Sun, Yuanxiong Cheng, Zhaohui Chen
Aiming at development of in-wheel motor direct drive for mini electric vehicles, the paper presents a disc type permanent magnet synchronous motor (PMSM) with combination of 27-slot/24-pole. In order to suppress the torque fluctuation of the motor, the coupling method of response surface method and finite element analysis (FEA) for optimum parameter design of the motor is proposed. The mathematical model of response surface is established. The torque fluctuation ratio is decreased to a low level by optimization. The paper demonstrates that the disc type PMSMs have strong merits for in-wheel direct drive application of electric vehicles, and provides an effective solution for optimization of complicated three-dimensional electromagnetic structure based on finite element method (FEM).
{"title":"Minimization of Torque Fluctuation in Disc Type In-Wheel Motor Based on Response Surface Method and FEA","authors":"Q. Sun, Yuanxiong Cheng, Zhaohui Chen","doi":"10.1109/ICGEA.2019.8880729","DOIUrl":"https://doi.org/10.1109/ICGEA.2019.8880729","url":null,"abstract":"Aiming at development of in-wheel motor direct drive for mini electric vehicles, the paper presents a disc type permanent magnet synchronous motor (PMSM) with combination of 27-slot/24-pole. In order to suppress the torque fluctuation of the motor, the coupling method of response surface method and finite element analysis (FEA) for optimum parameter design of the motor is proposed. The mathematical model of response surface is established. The torque fluctuation ratio is decreased to a low level by optimization. The paper demonstrates that the disc type PMSMs have strong merits for in-wheel direct drive application of electric vehicles, and provides an effective solution for optimization of complicated three-dimensional electromagnetic structure based on finite element method (FEM).","PeriodicalId":170713,"journal":{"name":"2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134290044","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 : 2019-03-01DOI: 10.1109/ICGEA.2019.8880762
Guo Mingjing, L. Xiaohui, Jiang Ziyu, Min Yuanyuan, Bu Yan, Bai Jinhong
Studying the security status of China's natural gas supply and proposing a feasible coping strategy for enhancing that security is of great significance. This paper from the security of supply, demand and market security three dimensions to build China's natural gas supply and demand of security evaluation index system, and index evaluation criteria according to the I (poor), II (medium), III (better), was analyzed by using the set pair analysis model between 2006 and 2017, China's natural gas supply and demand of security evolution trend. The research shows that the overall security index of natural gas supply and demand in China from 2000 to 2017 shows a trend of first rising and then falling, the correlation between China's natural gas supply and demand security index and the optimal evaluation set III fluctuates from 0.16 in 2006 to 0.34 in 2009 and then to 0.22 in 2017. Finally, we put forward some policy implications to ensure the security of natural gas supply and demand in China from the perspectives of natural gas supply, efficiency and market.
{"title":"Assessment of Natural Gas Supply and Demand Security in China Based on Set Pair Analysis","authors":"Guo Mingjing, L. Xiaohui, Jiang Ziyu, Min Yuanyuan, Bu Yan, Bai Jinhong","doi":"10.1109/ICGEA.2019.8880762","DOIUrl":"https://doi.org/10.1109/ICGEA.2019.8880762","url":null,"abstract":"Studying the security status of China's natural gas supply and proposing a feasible coping strategy for enhancing that security is of great significance. This paper from the security of supply, demand and market security three dimensions to build China's natural gas supply and demand of security evaluation index system, and index evaluation criteria according to the I (poor), II (medium), III (better), was analyzed by using the set pair analysis model between 2006 and 2017, China's natural gas supply and demand of security evolution trend. The research shows that the overall security index of natural gas supply and demand in China from 2000 to 2017 shows a trend of first rising and then falling, the correlation between China's natural gas supply and demand security index and the optimal evaluation set III fluctuates from 0.16 in 2006 to 0.34 in 2009 and then to 0.22 in 2017. Finally, we put forward some policy implications to ensure the security of natural gas supply and demand in China from the perspectives of natural gas supply, efficiency and market.","PeriodicalId":170713,"journal":{"name":"2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131466884","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 : 2019-03-01DOI: 10.1109/ICGEA.2019.8880777
Zhao Houliao, Zhang Baohuai
A novel liquid H2/O2combustion power circulation system based on energy storage is proposed, which has the advantages of high efficiency, energy storage and peak regulation. The liquefied oxygen is produced during offpeak hours. Based on the theoretical calculation, the operating characteristics of the system under high temperature and high-pressure conditions are analyzed. The liquid H2/02are pressurized with booster pumps and heated by environment or exhausted steam, then injected into the combustion chamber. Furthermore, the circulating water is added into system to low down the steam temperature for the safety of the equipment. The “cold energy” utilization module is applied to the system. Simulation and parameter optimization results show that the efficiency of the system can reach 55% with the utilization of cold energy. The cycle efficiency can still reach 50.8% without the utilization of cold energy when the inlet pressure of the turbine is 40-60MPa and the inlet temperature is above 1500°C.
{"title":"A Novel Liquid H2/O2Combustion Power Circulation System Based on Energy Storage","authors":"Zhao Houliao, Zhang Baohuai","doi":"10.1109/ICGEA.2019.8880777","DOIUrl":"https://doi.org/10.1109/ICGEA.2019.8880777","url":null,"abstract":"A novel liquid H2/O2combustion power circulation system based on energy storage is proposed, which has the advantages of high efficiency, energy storage and peak regulation. The liquefied oxygen is produced during offpeak hours. Based on the theoretical calculation, the operating characteristics of the system under high temperature and high-pressure conditions are analyzed. The liquid H2/02are pressurized with booster pumps and heated by environment or exhausted steam, then injected into the combustion chamber. Furthermore, the circulating water is added into system to low down the steam temperature for the safety of the equipment. The “cold energy” utilization module is applied to the system. Simulation and parameter optimization results show that the efficiency of the system can reach 55% with the utilization of cold energy. The cycle efficiency can still reach 50.8% without the utilization of cold energy when the inlet pressure of the turbine is 40-60MPa and the inlet temperature is above 1500°C.","PeriodicalId":170713,"journal":{"name":"2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)","volume":"240 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114662887","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 : 2019-03-01DOI: 10.1109/ICGEA.2019.8880746
R. Sun
Due to a large number of equipments and complicated system, the double-tower double-circulation desulfurization system has the problem of high power consumption. This artical takes the double-tower double-circulation desulfurization system of a high-sulfur coal-fired power plant as the research object, and studies the desulfurization system from the perspective of material consumption and energy consumption. It represents good economics of system optimization in the combination of water system, limestone supply system, oxidation fan and slurry circulation pump. Thus, it provides experience for other high-sulfur coal-fired power plant to reduce the power consumption of desulfurization system.
{"title":"Optimized Operation Analysis of Double-Tower Double-Circulation Desulfurization System in a High-Sulfur Coal-Fired Power Plant","authors":"R. Sun","doi":"10.1109/ICGEA.2019.8880746","DOIUrl":"https://doi.org/10.1109/ICGEA.2019.8880746","url":null,"abstract":"Due to a large number of equipments and complicated system, the double-tower double-circulation desulfurization system has the problem of high power consumption. This artical takes the double-tower double-circulation desulfurization system of a high-sulfur coal-fired power plant as the research object, and studies the desulfurization system from the perspective of material consumption and energy consumption. It represents good economics of system optimization in the combination of water system, limestone supply system, oxidation fan and slurry circulation pump. Thus, it provides experience for other high-sulfur coal-fired power plant to reduce the power consumption of desulfurization system.","PeriodicalId":170713,"journal":{"name":"2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)","volume":"982 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116219712","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 : 2019-03-01DOI: 10.1109/ICGEA.2019.8880764
Huayun Wang, Qiong Li, G. Xie, Wangling He, L. Lan
With the development of EHV/UHV transmission technology, the calculation of the electric field strength on the surface of bundle conductors is a major problem. In this paper, considering the influence of sag, a calculation model of the field strength of the wire surface based on the CSM is proposed. The model firstly equates the bundle conductors into a single wire, and then uses the conformal transformation and considers the interaction between bundle conductors, finally get the distribution along the maximum surface field strength of the bundle conductors. The accuracy of the calculation method is verified by comparison with COMSOL Multiphysics simulation results. Finally, this model is used to calculate the distribution characteristics of the maximum field strength of the conductor surface in the cross-over region when the 1000kV line crosses the 500kV line.
{"title":"Calculation of Field Strength of Bundle Conductor Surface of Transmission Lines and Analysis of It along the Transmission Line","authors":"Huayun Wang, Qiong Li, G. Xie, Wangling He, L. Lan","doi":"10.1109/ICGEA.2019.8880764","DOIUrl":"https://doi.org/10.1109/ICGEA.2019.8880764","url":null,"abstract":"With the development of EHV/UHV transmission technology, the calculation of the electric field strength on the surface of bundle conductors is a major problem. In this paper, considering the influence of sag, a calculation model of the field strength of the wire surface based on the CSM is proposed. The model firstly equates the bundle conductors into a single wire, and then uses the conformal transformation and considers the interaction between bundle conductors, finally get the distribution along the maximum surface field strength of the bundle conductors. The accuracy of the calculation method is verified by comparison with COMSOL Multiphysics simulation results. Finally, this model is used to calculate the distribution characteristics of the maximum field strength of the conductor surface in the cross-over region when the 1000kV line crosses the 500kV line.","PeriodicalId":170713,"journal":{"name":"2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117327745","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 : 2019-03-01DOI: 10.1109/ICGEA.2019.8880776
Sirui Tong
LCL wave filter can effectively suppress the high-order harmonics of current and reduce the total inductance. It is suitable for larger capacity wind power generation. However, its third-order characteristics may produce high-order resonance, which may cause the grid-connected system to be unstable. This paper takes 2MW doubly-fed wind power generation as the research object. According to the working principle of LCL wave filter, the main circuit parameters are determined. The values of wave filter inductors L1, L2 and filter capacitors C are determined without dividing the two inductors equally. The mathematical model of three-phase grid-connected inverters is established, and the PR control strategy is improved to solve the problem that the system may not be effectively implemented without static error tracking control. The simulation results show that the inverter based on LCL meets the requirements of IEEE standard. THD of harmonics above 35 times is only 0.23%, which is lower than 0.3 % of the standard requirement. The harmonic content in grid-connected current of wind power generation system with improved PR control strategy is less, which can ensure that 2MW doubly-fed wind power generation system delivers high power factor power to the grid.
{"title":"Design and Control Strategy of Wind Power Grid-Connected Inverter Based on LCL Wave Filter","authors":"Sirui Tong","doi":"10.1109/ICGEA.2019.8880776","DOIUrl":"https://doi.org/10.1109/ICGEA.2019.8880776","url":null,"abstract":"LCL wave filter can effectively suppress the high-order harmonics of current and reduce the total inductance. It is suitable for larger capacity wind power generation. However, its third-order characteristics may produce high-order resonance, which may cause the grid-connected system to be unstable. This paper takes 2MW doubly-fed wind power generation as the research object. According to the working principle of LCL wave filter, the main circuit parameters are determined. The values of wave filter inductors L1, L2 and filter capacitors C are determined without dividing the two inductors equally. The mathematical model of three-phase grid-connected inverters is established, and the PR control strategy is improved to solve the problem that the system may not be effectively implemented without static error tracking control. The simulation results show that the inverter based on LCL meets the requirements of IEEE standard. THD of harmonics above 35 times is only 0.23%, which is lower than 0.3 % of the standard requirement. The harmonic content in grid-connected current of wind power generation system with improved PR control strategy is less, which can ensure that 2MW doubly-fed wind power generation system delivers high power factor power to the grid.","PeriodicalId":170713,"journal":{"name":"2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134004385","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 : 2019-03-01DOI: 10.1109/ICGEA.2019.8880780
Pengcheng Wang, Lei Guo, Bin Liu, Y. Zeng, Sixiang Chen, Lijun Zhou
Experiments show that the inductance effect of grounding device under impulse current is especially obvious at low soil resistivity. Based on the theory of transmission line and the theory of finite element dispersion analysis, a transient analysis model of grounding device is established by field-circuit coupling method (FCM). The method considers the electromagnetic coupling between grounding conductors and can accurately reflect the impact characteristics of grounding devices under low soil resistivity. This method is used to calculate the impedance value and impedance angle of a single grounding body in full frequency domain within 0-100kHz, which is basically consistent with the results of CDEGS. The divergence of the conductor segment is compared and the results are in good agreement. Therefore, the field-circuit coupling model can effectively analyze the impact characteristics of grounding devices.
{"title":"Field-Circuit Coupling Analysis Method for Grounding Devices Considering Inductance Effect","authors":"Pengcheng Wang, Lei Guo, Bin Liu, Y. Zeng, Sixiang Chen, Lijun Zhou","doi":"10.1109/ICGEA.2019.8880780","DOIUrl":"https://doi.org/10.1109/ICGEA.2019.8880780","url":null,"abstract":"Experiments show that the inductance effect of grounding device under impulse current is especially obvious at low soil resistivity. Based on the theory of transmission line and the theory of finite element dispersion analysis, a transient analysis model of grounding device is established by field-circuit coupling method (FCM). The method considers the electromagnetic coupling between grounding conductors and can accurately reflect the impact characteristics of grounding devices under low soil resistivity. This method is used to calculate the impedance value and impedance angle of a single grounding body in full frequency domain within 0-100kHz, which is basically consistent with the results of CDEGS. The divergence of the conductor segment is compared and the results are in good agreement. Therefore, the field-circuit coupling model can effectively analyze the impact characteristics of grounding devices.","PeriodicalId":170713,"journal":{"name":"2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131163910","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 : 2019-03-01DOI: 10.1109/ICGEA.2019.8880760
Zengbao Wang, A. Tang, Xu Zheng, Qiushi Xu
the doubly-fed wind power generator is more sensitive to the voltage of the machine falls, with the increasing of wind power installed capacity, power grid failure of doubly-fed wind power generator rotor current analysis and it is very important to evaluate accurately, relationship with doubly-fed wind power generator through the implementation of the low voltage and the analysis and calculation of fault electric parameters. Starting from the principle of doubly-fed induction generator, mathematical model is established, when grid short-circuit fault of its rotor galvanometer formula is derived, by time domain simulation results verify the validity of the expression and an example. The proposed expression using the voltage of the machine and the grid inverter control parameters can be calculated from short circuit at any time when the rotor current, has clear physical meaning and good practicability.
{"title":"Calculation of Rotor Currents for Doubly-Fed Induction Generation under Short Circuits in Power Grids","authors":"Zengbao Wang, A. Tang, Xu Zheng, Qiushi Xu","doi":"10.1109/ICGEA.2019.8880760","DOIUrl":"https://doi.org/10.1109/ICGEA.2019.8880760","url":null,"abstract":"the doubly-fed wind power generator is more sensitive to the voltage of the machine falls, with the increasing of wind power installed capacity, power grid failure of doubly-fed wind power generator rotor current analysis and it is very important to evaluate accurately, relationship with doubly-fed wind power generator through the implementation of the low voltage and the analysis and calculation of fault electric parameters. Starting from the principle of doubly-fed induction generator, mathematical model is established, when grid short-circuit fault of its rotor galvanometer formula is derived, by time domain simulation results verify the validity of the expression and an example. The proposed expression using the voltage of the machine and the grid inverter control parameters can be calculated from short circuit at any time when the rotor current, has clear physical meaning and good practicability.","PeriodicalId":170713,"journal":{"name":"2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116795597","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 : 1900-01-01DOI: 10.1109/ICGEA.2019.8880795
Menghua Liu, Wei Zhao, Songling Huang, Kunpeng Shi, Qing Wang
The islanding detection methods that detect an island through injecting high/low frequency currents or negative sequence currents are called irregular current injection methods in this paper. A synchronization issue of such methods is raised in multi-DG (Distributed Generation) operation. This issue requires that the same frequency irregular currents injected by DG units should be in phase to avoid cancelling each other out. If this issue is not handled properly, the effect of such methods is uncontrollable. In view of this, an approach to this issue is proposed in this paper. According to this approach, the terminal voltage of a DG unit is taken as a reference to conduct the irregular current injection, and only parts of the irregular currents whose frequencies are an integer multiple of the frequency of the reference voltage are employed. Finally, experiments and simulations verify the effect of the proposed approach.
{"title":"Synchronization Issues with Irregular Current Injection Islanding Detection Methods in Multi-DG Operation","authors":"Menghua Liu, Wei Zhao, Songling Huang, Kunpeng Shi, Qing Wang","doi":"10.1109/ICGEA.2019.8880795","DOIUrl":"https://doi.org/10.1109/ICGEA.2019.8880795","url":null,"abstract":"The islanding detection methods that detect an island through injecting high/low frequency currents or negative sequence currents are called irregular current injection methods in this paper. A synchronization issue of such methods is raised in multi-DG (Distributed Generation) operation. This issue requires that the same frequency irregular currents injected by DG units should be in phase to avoid cancelling each other out. If this issue is not handled properly, the effect of such methods is uncontrollable. In view of this, an approach to this issue is proposed in this paper. According to this approach, the terminal voltage of a DG unit is taken as a reference to conduct the irregular current injection, and only parts of the irregular currents whose frequencies are an integer multiple of the frequency of the reference voltage are employed. Finally, experiments and simulations verify the effect of the proposed approach.","PeriodicalId":170713,"journal":{"name":"2019 IEEE 3rd International Conference on Green Energy and Applications (ICGEA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132792780","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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