Pub Date : 2018-12-01DOI: 10.1109/SPEC.2018.8636054
Leandro T. Omine, M. D. de Brito, J. Pinto, R. García
Photovoltaic generation systems under partial shading conditions are difficult to optimize using conventional maximum power point tracking (MPPT) algorithms. Most of the techniques developed for these conditions fail to track dynamically the MPP and leads to energy losses during normal operation. This paper presents hybrid MPPT algorithms combining global and local MPPTs to extract the most available energy from the system under any condition. The methods are compared through simulations using Matlab/Simulink®, where the tracking factor (TF) and power characteristics during time are evaluated.
{"title":"Hybrid MPPT Algorithms for Photovoltaic Systems","authors":"Leandro T. Omine, M. D. de Brito, J. Pinto, R. García","doi":"10.1109/SPEC.2018.8636054","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8636054","url":null,"abstract":"Photovoltaic generation systems under partial shading conditions are difficult to optimize using conventional maximum power point tracking (MPPT) algorithms. Most of the techniques developed for these conditions fail to track dynamically the MPP and leads to energy losses during normal operation. This paper presents hybrid MPPT algorithms combining global and local MPPTs to extract the most available energy from the system under any condition. The methods are compared through simulations using Matlab/Simulink®, where the tracking factor (TF) and power characteristics during time are evaluated.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127544990","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635992
Xin Zhang, Jinsong He, Chung, Shu-hung Henry
Parallel inverters are always utilized in renewable energy systems to transfer the power from different renewable resources to the grid. However, the parallel inverters may suffer instability problem, i.e., even though each inverter is stable individually, the paralleled inverters may be unstable due to the interaction among these inverters or cables. Though a lot of existing stability impedance criteria have already been proposed to assess the stability of the paralleled inverters, they are all targeting specific systems with special assumptions, such as supposing all the inverter parameters are the same, ignore the cable’s impedance or treat all the cables as short cables, etc. In this paper, a generic stability impedance criterion has been proposed without any assumptions. Hence, this proposed criterion can evaluate the stability of any types of parallel inverters with different inverter parameters and long/short cables. The detailed derivation of the proposed criterion has also been presented. Finally, the effectiveness of this criterion has been validated by a 5 kW parallel inverters system including three totally different inverters & cables.
{"title":"Generic Stability Impedance Criterion for the Parallel Inverters System","authors":"Xin Zhang, Jinsong He, Chung, Shu-hung Henry","doi":"10.1109/SPEC.2018.8635992","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635992","url":null,"abstract":"Parallel inverters are always utilized in renewable energy systems to transfer the power from different renewable resources to the grid. However, the parallel inverters may suffer instability problem, i.e., even though each inverter is stable individually, the paralleled inverters may be unstable due to the interaction among these inverters or cables. Though a lot of existing stability impedance criteria have already been proposed to assess the stability of the paralleled inverters, they are all targeting specific systems with special assumptions, such as supposing all the inverter parameters are the same, ignore the cable’s impedance or treat all the cables as short cables, etc. In this paper, a generic stability impedance criterion has been proposed without any assumptions. Hence, this proposed criterion can evaluate the stability of any types of parallel inverters with different inverter parameters and long/short cables. The detailed derivation of the proposed criterion has also been presented. Finally, the effectiveness of this criterion has been validated by a 5 kW parallel inverters system including three totally different inverters & cables.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131773060","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635643
Jinghua Zhou, Rong Zhang, Xinlei Zhang, Jiewei Wu, Weichao Huang
For poor inverter output voltage quality caused by operation of asymmetric load and nonlinear load in the micro-grid system, a compound control strategy for inverter output voltage was proposed; in this paper, based on positive sequence rotating coordinate system, Proportion Integrator (PI)+ Vector Proportion Integrator (VPI) controller was used to control fundamental voltage and unbalanced voltage. And based on two-phase static coordinate system, VPI controller was used to control harmonic voltage to finally realize voltage quality governance. In addition, DC/AC + z-type grounding transformer topology was adopted to solve supporting problem of single-phase load by a three-phase three-wire inverter. Finally, a 2.5MW converter device was established to carry out an experimental study based on TMS320F28377D controller. The experimental result verified effectiveness of the proposed control strategy. At present, this device has been applied to flexible substation system in Aliyun data center located in Zhangbei County, Zhangjiakou City, China.
{"title":"A Compound Control Strategy for Inverter Output Voltage in Micro-grid System","authors":"Jinghua Zhou, Rong Zhang, Xinlei Zhang, Jiewei Wu, Weichao Huang","doi":"10.1109/SPEC.2018.8635643","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635643","url":null,"abstract":"For poor inverter output voltage quality caused by operation of asymmetric load and nonlinear load in the micro-grid system, a compound control strategy for inverter output voltage was proposed; in this paper, based on positive sequence rotating coordinate system, Proportion Integrator (PI)+ Vector Proportion Integrator (VPI) controller was used to control fundamental voltage and unbalanced voltage. And based on two-phase static coordinate system, VPI controller was used to control harmonic voltage to finally realize voltage quality governance. In addition, DC/AC + z-type grounding transformer topology was adopted to solve supporting problem of single-phase load by a three-phase three-wire inverter. Finally, a 2.5MW converter device was established to carry out an experimental study based on TMS320F28377D controller. The experimental result verified effectiveness of the proposed control strategy. At present, this device has been applied to flexible substation system in Aliyun data center located in Zhangbei County, Zhangjiakou City, China.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129667515","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8636022
H. Zong, Xiangjun Zhang, Xiaorui Zhang, Yijie Wang, Dianguo Xu, Hailin Tian, Xiufang Liu, D. Yan
Contact-type rotary electronic devices have the disadvantages of easy wear and no electrical isolation, which is not conducive to the safety and reliability of the device. In this paper, a contactless rotary inductively coupled power transfer (ICPT) device has been proposed, which provides electrical isolation, higher flexibility and greater security. The device consists of a rotary loosely coupled transformer, S/LCC compensated resonant converter and a DC-DC converter. To verify the analysis and design, a 400W rotatable prototype with a 50mm gap was fabricated and tested. An overall efficiency 84.3% was achieved from DC 40V input to DC 40 V output.
{"title":"Design of a Contactless Rotary Device Based on Inductively Coupled Power Transfer","authors":"H. Zong, Xiangjun Zhang, Xiaorui Zhang, Yijie Wang, Dianguo Xu, Hailin Tian, Xiufang Liu, D. Yan","doi":"10.1109/SPEC.2018.8636022","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8636022","url":null,"abstract":"Contact-type rotary electronic devices have the disadvantages of easy wear and no electrical isolation, which is not conducive to the safety and reliability of the device. In this paper, a contactless rotary inductively coupled power transfer (ICPT) device has been proposed, which provides electrical isolation, higher flexibility and greater security. The device consists of a rotary loosely coupled transformer, S/LCC compensated resonant converter and a DC-DC converter. To verify the analysis and design, a 400W rotatable prototype with a 50mm gap was fabricated and tested. An overall efficiency 84.3% was achieved from DC 40V input to DC 40 V output.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129241171","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635941
Yuanzhu Chang, Jiabing Hu, E. Zhang, Xiaojie Zhang
Due to Type-3 wind turbine (WT) has already become a highly penetrated power source in modern power systems, characterizing its properties during short circuit is a basic requirement for system analysis. However, although nonlinearity, such as saturation effect of doubly fed induction generator (DFIG) and the dynamic of phase-locked loop (PLL), is a critical determinant, it has been simply ignored in the existing literatures. This paper is focusing on the impact of nonlinearity on Type-3 WT's fault current. First, a 10kW experimental prototype is carefully designed in laboratorial scale to demonstrate the dynamic performance of Type-3 WT during low voltage ride through (LVRT). Then, the impact of those nonlinear elements on fault current is quantified through the comparisons with the analytical results that are calculated without the consideration of nonlinearity. It shows that the nonlinear feature mainly influences the maximum value of fault current in the instant control time scale. Hence, expressions and method are proposed to evaluate the actual momentary current of a Type-3 WT. The conclusion of this paper is expected to be implemented in rating circuit breakers and other equipment.
{"title":"Impact of Nonlinearity on Type-3 WT's Fault Current","authors":"Yuanzhu Chang, Jiabing Hu, E. Zhang, Xiaojie Zhang","doi":"10.1109/SPEC.2018.8635941","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635941","url":null,"abstract":"Due to Type-3 wind turbine (WT) has already become a highly penetrated power source in modern power systems, characterizing its properties during short circuit is a basic requirement for system analysis. However, although nonlinearity, such as saturation effect of doubly fed induction generator (DFIG) and the dynamic of phase-locked loop (PLL), is a critical determinant, it has been simply ignored in the existing literatures. This paper is focusing on the impact of nonlinearity on Type-3 WT's fault current. First, a 10kW experimental prototype is carefully designed in laboratorial scale to demonstrate the dynamic performance of Type-3 WT during low voltage ride through (LVRT). Then, the impact of those nonlinear elements on fault current is quantified through the comparisons with the analytical results that are calculated without the consideration of nonlinearity. It shows that the nonlinear feature mainly influences the maximum value of fault current in the instant control time scale. Hence, expressions and method are proposed to evaluate the actual momentary current of a Type-3 WT. The conclusion of this paper is expected to be implemented in rating circuit breakers and other equipment.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121096623","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635846
P. Jayathurathnage, M. Vilathgamuwa, C. Simovski
This paper discusses the applicability of the two- port network model for the analysis of wireless power transfer (WPT) systems. The two-port network model has been extensively used to analyze microwave circuits, and identical principles have been applied to WPT. The standard gain parameters defined for the two-port networks are critically analyzed with regards to WPT systems. The usefulness and the practical limitations of the gain parameters are highlighted. In addition to power transfer efficiency (PTE), an alternative gain parameter, square voltage gain is defined to estimate the power transfer capability of the WPT system. The proposed performance indices are then computed in terms of generalized two-port network parameters along with a generalized optimization methodology. A case study is presented for the optimization of a WPT system with a repeater.
{"title":"Revisiting Two-Port Network Analysis for Wireless Power Transfer (WPT) Systems","authors":"P. Jayathurathnage, M. Vilathgamuwa, C. Simovski","doi":"10.1109/SPEC.2018.8635846","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635846","url":null,"abstract":"This paper discusses the applicability of the two- port network model for the analysis of wireless power transfer (WPT) systems. The two-port network model has been extensively used to analyze microwave circuits, and identical principles have been applied to WPT. The standard gain parameters defined for the two-port networks are critically analyzed with regards to WPT systems. The usefulness and the practical limitations of the gain parameters are highlighted. In addition to power transfer efficiency (PTE), an alternative gain parameter, square voltage gain is defined to estimate the power transfer capability of the WPT system. The proposed performance indices are then computed in terms of generalized two-port network parameters along with a generalized optimization methodology. A case study is presented for the optimization of a WPT system with a repeater.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116770207","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635925
M. Uddin, G. Mirzaeva, G. Goodwin
Common-mode-voltage (CMV) is known for creating electromagnetic interference and bearing currents in industrial drive applications. This problem is exacerbated in mobile applications, due to the use of long cables carrying supply and protective earth conductors. In such applications matrix converters are seen as a potential drive solution. This paper presents a detailed study showing the possibility to completely eliminate CMV in the matrix converter based system, using voltage control based model predictive control (MPC). The paper compares performance of the direct matrix converter (DMC) for different output frequencies, under the imposed condition of zero CMV. The paper also presents a systematical discretization method, which is used to accurately calculate the input filter constants. Based on extensive simulations performed in MATLAB-Simulink environment, the paper demonstrates suitability of DMC based drives for CMV-sensitive applications.
{"title":"Model Predictive Control of Direct Matrix Converter with Common Mode Voltage Elimination","authors":"M. Uddin, G. Mirzaeva, G. Goodwin","doi":"10.1109/SPEC.2018.8635925","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635925","url":null,"abstract":"Common-mode-voltage (CMV) is known for creating electromagnetic interference and bearing currents in industrial drive applications. This problem is exacerbated in mobile applications, due to the use of long cables carrying supply and protective earth conductors. In such applications matrix converters are seen as a potential drive solution. This paper presents a detailed study showing the possibility to completely eliminate CMV in the matrix converter based system, using voltage control based model predictive control (MPC). The paper compares performance of the direct matrix converter (DMC) for different output frequencies, under the imposed condition of zero CMV. The paper also presents a systematical discretization method, which is used to accurately calculate the input filter constants. Based on extensive simulations performed in MATLAB-Simulink environment, the paper demonstrates suitability of DMC based drives for CMV-sensitive applications.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"417 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117315332","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635878
Y. Baviskar, U. Suryawanshi, A. Sheikh
The railway signalling domain is a complex critical infrastructure, linking communication and number of control elements. Ensuring safety in railway signalling system is always considered as a guarantee of intact operation of the railway. Current signalling system composes of centralized controllers which provide a single feature such as interlocking, and level crossing control. The Indian Railways (IR) uses Panel Interlocking (PI), Route Relay Interlocking (RRI), and Solid State Interlocking (SSI) or Electronic Interlocking (EI) for signalling safety, however, permitting movement of the trains lies in the hands of a human. The main challenge is to combine multiple sources of data and define a system which can intensify the functionality of the system. This paper mainly focuses on development of an automated model, beneficial to Intelligent Signalling System (ISS). Assessing its ability to take a decision which authorizes the movement of trains according to the timetable and modify it depending on real-time information using Machine Learning (ML). For modelling, IR standard single line station layout is considered and graphical model-based design techniques are implied. For analysis consider the track sections as nodes, signals as the start point and the end point linked to specific routes and assessing the developed model for various operating scenarios keeping a strict check on completeness and consistency. Implementation of such system in the railway network will not only provide a comprehensive level of safety in railway transportation but also takes a step forward towards systematizing various methods and strategies such as rescheduling system, monitoring performance under one roof using ML
{"title":"Modelling of Track Layout for Intelligent Railway Signalling System: A Machine Learning Application","authors":"Y. Baviskar, U. Suryawanshi, A. Sheikh","doi":"10.1109/SPEC.2018.8635878","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635878","url":null,"abstract":"The railway signalling domain is a complex critical infrastructure, linking communication and number of control elements. Ensuring safety in railway signalling system is always considered as a guarantee of intact operation of the railway. Current signalling system composes of centralized controllers which provide a single feature such as interlocking, and level crossing control. The Indian Railways (IR) uses Panel Interlocking (PI), Route Relay Interlocking (RRI), and Solid State Interlocking (SSI) or Electronic Interlocking (EI) for signalling safety, however, permitting movement of the trains lies in the hands of a human. The main challenge is to combine multiple sources of data and define a system which can intensify the functionality of the system. This paper mainly focuses on development of an automated model, beneficial to Intelligent Signalling System (ISS). Assessing its ability to take a decision which authorizes the movement of trains according to the timetable and modify it depending on real-time information using Machine Learning (ML). For modelling, IR standard single line station layout is considered and graphical model-based design techniques are implied. For analysis consider the track sections as nodes, signals as the start point and the end point linked to specific routes and assessing the developed model for various operating scenarios keeping a strict check on completeness and consistency. Implementation of such system in the railway network will not only provide a comprehensive level of safety in railway transportation but also takes a step forward towards systematizing various methods and strategies such as rescheduling system, monitoring performance under one roof using ML","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"147 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115118310","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635837
Hongda Wu, Jinjun Liu, Shaodi Ouyang
Space vector modulation (SVM) is widely used in traditional three-phase converters, but when extended to multilevel converters it suffers from issues of heavy computation cost and intense memory usage. Researchers have proposed many simplified SVM algorithms, but they are still impractical in some respects. This paper examines a simplified SVM algorithm based on H-D coordinates, which has simpler calculations than simplified algorithms based on other coordinate systems. Then, this paper analyzes this simplified algorithm and finds it has an inherent three-phase unbalance problem. There are two reasons for the unbalance: the unbalance of generation rules and the directionality of H-D coordinates. Then, based on the feature of HD coordinates, we propose an improved SVM algorithm. The proposed algorithm divides the hexagonal vector space diagram into three diamond-shaped areas equally and can take full advantage of the similarities among them. Consequently, the unbalance problem is solved and the calculations are still compact. In addition, the proposed algorithm has another two features: simplified calculation in a condition of overmodulation and better balance performance when switching frequency equals a multiple of 150 Hz. Based on our findings, we believe the proposed SVM algorithm is more practical than others and is suitable for large level-number applications like three-phase modular multilevel converters. Simulations in various operating conditions are done.
{"title":"An Improvement on A Simplified Space Vector Modulation Algorithm to Solve the Inherent Three-Phase Unbalance","authors":"Hongda Wu, Jinjun Liu, Shaodi Ouyang","doi":"10.1109/SPEC.2018.8635837","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635837","url":null,"abstract":"Space vector modulation (SVM) is widely used in traditional three-phase converters, but when extended to multilevel converters it suffers from issues of heavy computation cost and intense memory usage. Researchers have proposed many simplified SVM algorithms, but they are still impractical in some respects. This paper examines a simplified SVM algorithm based on H-D coordinates, which has simpler calculations than simplified algorithms based on other coordinate systems. Then, this paper analyzes this simplified algorithm and finds it has an inherent three-phase unbalance problem. There are two reasons for the unbalance: the unbalance of generation rules and the directionality of H-D coordinates. Then, based on the feature of HD coordinates, we propose an improved SVM algorithm. The proposed algorithm divides the hexagonal vector space diagram into three diamond-shaped areas equally and can take full advantage of the similarities among them. Consequently, the unbalance problem is solved and the calculations are still compact. In addition, the proposed algorithm has another two features: simplified calculation in a condition of overmodulation and better balance performance when switching frequency equals a multiple of 150 Hz. Based on our findings, we believe the proposed SVM algorithm is more practical than others and is suitable for large level-number applications like three-phase modular multilevel converters. Simulations in various operating conditions are done.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124005125","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635978
Wangqianyun Tang, Jiabing Hu, Rui Zhang
The input mechanical power affects the transient stability by changing the transient energy of the power system. The mechanical power characteristics of doubly fed induction generator (DFIG)-based wind turbines (WTs) are more complex and the variation ranges are wider when compared with those of synchronous generators (SGs’) owing to the different energy conversion mechanisms, which leads the transient stability of DFIG-based WT more diverse. This paper systematically analyzes the impact of the mechanical power variation on the transient stability of DFIG-based WT. Firstly, the analytical model considering the mechanical power is presented. In comparison with SG, the characteristics of mechanical power of the DFIG-based WT are summed up. Then, based on the model, the transient stability of a single DFIG-based WT-connected system is theoretically analyzed. The instability mechanism and phenomena are found to be variable in different wind speeds. Finally, the impacts of the summarized factors of mechanical power on transient stability of DFIG-based WT are discussed, including the wind conditions, aerodynamics and pitch controls.
{"title":"Impact of Mechanical Power Variation on Transient Stability of DFIG-based Wind Turbine","authors":"Wangqianyun Tang, Jiabing Hu, Rui Zhang","doi":"10.1109/SPEC.2018.8635978","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635978","url":null,"abstract":"The input mechanical power affects the transient stability by changing the transient energy of the power system. The mechanical power characteristics of doubly fed induction generator (DFIG)-based wind turbines (WTs) are more complex and the variation ranges are wider when compared with those of synchronous generators (SGs’) owing to the different energy conversion mechanisms, which leads the transient stability of DFIG-based WT more diverse. This paper systematically analyzes the impact of the mechanical power variation on the transient stability of DFIG-based WT. Firstly, the analytical model considering the mechanical power is presented. In comparison with SG, the characteristics of mechanical power of the DFIG-based WT are summed up. Then, based on the model, the transient stability of a single DFIG-based WT-connected system is theoretically analyzed. The instability mechanism and phenomena are found to be variable in different wind speeds. Finally, the impacts of the summarized factors of mechanical power on transient stability of DFIG-based WT are discussed, including the wind conditions, aerodynamics and pitch controls.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130973740","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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