Pub Date : 2021-10-13DOI: 10.1109/IECON48115.2021.9589291
Manish Kumar, S. Pramanick, B. K. Panigrahi
On-board charger (OBC) power handling capability has been increasing over the past few years for reducing the charging time. This requires a much detailed analysis of the losses incurred in OBCs for better volumetric design and improved effi-ciency. This paper presents a comprehensive loss model of a single stage (1-S) single phase (1-ϕ) OBC. The OBC is realized using a current-fed half-bridge converter at grid side with swinging boost inductor and a full-bridge converter at the battery side, galvanically isolated by a high frequency transformer (HFT). Swinging boost inductor maintains high power factor and keeps the inductor current in continuous conduction mode (CCM) for a wide load range. The effect of swinging boost inductor on the losses of the converter is presented. A laboratory prototype connected to 230 V/50 Hz mains voltage with the output voltage range of 300-400 V is also developed to validate the theoretical analysis.
{"title":"A Detailed Loss Model of Current-Fed Half-Bridge AC-DC Converter Considering Swinging Boost Inductor","authors":"Manish Kumar, S. Pramanick, B. K. Panigrahi","doi":"10.1109/IECON48115.2021.9589291","DOIUrl":"https://doi.org/10.1109/IECON48115.2021.9589291","url":null,"abstract":"On-board charger (OBC) power handling capability has been increasing over the past few years for reducing the charging time. This requires a much detailed analysis of the losses incurred in OBCs for better volumetric design and improved effi-ciency. This paper presents a comprehensive loss model of a single stage (1-S) single phase (1-ϕ) OBC. The OBC is realized using a current-fed half-bridge converter at grid side with swinging boost inductor and a full-bridge converter at the battery side, galvanically isolated by a high frequency transformer (HFT). Swinging boost inductor maintains high power factor and keeps the inductor current in continuous conduction mode (CCM) for a wide load range. The effect of swinging boost inductor on the losses of the converter is presented. A laboratory prototype connected to 230 V/50 Hz mains voltage with the output voltage range of 300-400 V is also developed to validate the theoretical analysis.","PeriodicalId":443337,"journal":{"name":"IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123954516","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 : 2021-10-13DOI: 10.1109/IECON48115.2021.9589110
M. Mehrasa, M. Babaie, M. Sharifzadeh, S. Bacha, K. Al-haddad
In this paper, an adaptive fuzzy passivity-based control strategy is proposed to provide stable operation for a grid-tied nine-level packed E-Cell (PEC9) converter. Passivity theory is developed in the first step to enable the error dynamics of the PEC9 converter currents to reach a much more effective convergence rate using the proposed damping coefficients. Moreover, various operating margins are achieved for the damping coefficients through PEC9 current errors-based 3D curves. In order to establish online estimation for the damping coefficients, the fuzzy controller and Artificial Neural Network (ANN) are combined. Experimental and simulation results are employed to validate the accuracy of the proposed control technique under load variation, parameter mismatch and DC-link voltage variation.
{"title":"An Adaptive Fuzzy Passivity-based Control Strategy for Grid-Tied Packed E-Cell Converter","authors":"M. Mehrasa, M. Babaie, M. Sharifzadeh, S. Bacha, K. Al-haddad","doi":"10.1109/IECON48115.2021.9589110","DOIUrl":"https://doi.org/10.1109/IECON48115.2021.9589110","url":null,"abstract":"In this paper, an adaptive fuzzy passivity-based control strategy is proposed to provide stable operation for a grid-tied nine-level packed E-Cell (PEC9) converter. Passivity theory is developed in the first step to enable the error dynamics of the PEC9 converter currents to reach a much more effective convergence rate using the proposed damping coefficients. Moreover, various operating margins are achieved for the damping coefficients through PEC9 current errors-based 3D curves. In order to establish online estimation for the damping coefficients, the fuzzy controller and Artificial Neural Network (ANN) are combined. Experimental and simulation results are employed to validate the accuracy of the proposed control technique under load variation, parameter mismatch and DC-link voltage variation.","PeriodicalId":443337,"journal":{"name":"IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123330372","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 : 2021-10-13DOI: 10.1109/IECON48115.2021.9589108
I. Raghavendra, Satish Naik Banavath, T. Sreekanth
DC microgrid is gaining more popularity due to the advent and advancements in renewable energy sources, however, there are some challenges in its development such as protection of dc equipment from short-circuit faults. This paper proposes a modified solid-state dc circuit breaker for bidirectional power flow protection that reduces current stress on semiconductor devices during commissioning and reclosing. And also a method of system re-breaking or reclosing depending on the fault existence has been proposed. This circuit breaker topology has been verified with varying system parameters using the spice simulation tool. The protection of dc system by the proposed circuit breaker is experimentally verified for a system rating of 100V/10A.
{"title":"H-bridge Based Bidirectional Z-Source DC Circuit Breaker with Improved Device Stress and Automatic Reclosing Capability","authors":"I. Raghavendra, Satish Naik Banavath, T. Sreekanth","doi":"10.1109/IECON48115.2021.9589108","DOIUrl":"https://doi.org/10.1109/IECON48115.2021.9589108","url":null,"abstract":"DC microgrid is gaining more popularity due to the advent and advancements in renewable energy sources, however, there are some challenges in its development such as protection of dc equipment from short-circuit faults. This paper proposes a modified solid-state dc circuit breaker for bidirectional power flow protection that reduces current stress on semiconductor devices during commissioning and reclosing. And also a method of system re-breaking or reclosing depending on the fault existence has been proposed. This circuit breaker topology has been verified with varying system parameters using the spice simulation tool. The protection of dc system by the proposed circuit breaker is experimentally verified for a system rating of 100V/10A.","PeriodicalId":443337,"journal":{"name":"IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society","volume":"291 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123458820","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 : 2021-10-13DOI: 10.1109/IECON48115.2021.9589348
P. C. R. Varma, C. Mukundan, P. Jayaprakash, A. Al‐Durra, T. El-Fouly
A high gain multilevel inverter (HGMLI) based solar power transfer system (SPTS) is proposed in this paper. The five-level symmetrical source topology consists of eight semiconductor switches and two non-isolated DC sources. The HGMLI is comprised of a multilevel generator unit and a polarity alternating unit. Four switches in the circuit operate to achieve unipolar multiple levels and another four switches change the alternate polarity to get the desired five-level AC output voltage. Four switches are operated in level-shifted pulse width modulation and the other four are at the fundamental frequency. Moreover, the polarity alternating switches are operated at zero voltage levels to reduce the switching losses. A voltage booster circuit extracts maximum power from the photovoltaic (PV) array and exhibits a high gain in the voltage transformation for obtaining the desired DC-link voltage even for a low input voltage. The MLI is controlled by a second-order generalized integral-based filter to integrate active power to the grid. At the point of common coupling (PCC), a nonlinear harmonic load is connected, and its impact on grid power quality is mitigated by the SPTS operation maintaining within IEEE limits. Hence, maximum power extraction, active power injection, and power quality enhancement are the major objectives of this work. The proposed system performance is validated at different operating conditions with extensive analysis in the MATLAB/Simulink model.
{"title":"High Gain Multilevel Inverter Based Grid Integrated Solar Power Transfer System with Power Quality Enhancement","authors":"P. C. R. Varma, C. Mukundan, P. Jayaprakash, A. Al‐Durra, T. El-Fouly","doi":"10.1109/IECON48115.2021.9589348","DOIUrl":"https://doi.org/10.1109/IECON48115.2021.9589348","url":null,"abstract":"A high gain multilevel inverter (HGMLI) based solar power transfer system (SPTS) is proposed in this paper. The five-level symmetrical source topology consists of eight semiconductor switches and two non-isolated DC sources. The HGMLI is comprised of a multilevel generator unit and a polarity alternating unit. Four switches in the circuit operate to achieve unipolar multiple levels and another four switches change the alternate polarity to get the desired five-level AC output voltage. Four switches are operated in level-shifted pulse width modulation and the other four are at the fundamental frequency. Moreover, the polarity alternating switches are operated at zero voltage levels to reduce the switching losses. A voltage booster circuit extracts maximum power from the photovoltaic (PV) array and exhibits a high gain in the voltage transformation for obtaining the desired DC-link voltage even for a low input voltage. The MLI is controlled by a second-order generalized integral-based filter to integrate active power to the grid. At the point of common coupling (PCC), a nonlinear harmonic load is connected, and its impact on grid power quality is mitigated by the SPTS operation maintaining within IEEE limits. Hence, maximum power extraction, active power injection, and power quality enhancement are the major objectives of this work. The proposed system performance is validated at different operating conditions with extensive analysis in the MATLAB/Simulink model.","PeriodicalId":443337,"journal":{"name":"IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society","volume":"34 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120847077","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 : 2021-10-13DOI: 10.1109/IECON48115.2021.9589045
Fabio Amaral, Lucas Sakurada, P. Leitão, Jorge Larangeira
In the digital transformation era, the collection of data assumes a crucial relevance. In some applications, the use of real sensors to measure the target parameters is constrained by technical or economical limitations. In such situations, it is required to use alternative techniques based on soft sensors that acquire data by estimating the measurement of a variable through the correlation of the data acquired by the neighbouring sensors. However, the co-existence of real and soft sensors requires a computational infra-structure that integrates these heterogeneous data sources and supports the synchronisation of the monitoring system based on the inputs of different measurement nodes. Multi-agent systems provide this distributed infra-structure for the data collection, ensuring modularity, scalability and reconfigurability capabilities. This paper introduces a multi-agent system approach to create a modular and scalable sensing system, based on a diversity of real and soft sensors, to support the monitoring of temperature in thin-film sensing surfaces. The proposed approach was experimentally tested in a plastic injection process, presenting promising results in terms of accuracy and response time, and allowing to obtain more sampling points through the use of computational techniques to complement the real data.
{"title":"Multi-agent System for Monitoring Temperature in Sensing Surfaces including Hard and Soft Sensors","authors":"Fabio Amaral, Lucas Sakurada, P. Leitão, Jorge Larangeira","doi":"10.1109/IECON48115.2021.9589045","DOIUrl":"https://doi.org/10.1109/IECON48115.2021.9589045","url":null,"abstract":"In the digital transformation era, the collection of data assumes a crucial relevance. In some applications, the use of real sensors to measure the target parameters is constrained by technical or economical limitations. In such situations, it is required to use alternative techniques based on soft sensors that acquire data by estimating the measurement of a variable through the correlation of the data acquired by the neighbouring sensors. However, the co-existence of real and soft sensors requires a computational infra-structure that integrates these heterogeneous data sources and supports the synchronisation of the monitoring system based on the inputs of different measurement nodes. Multi-agent systems provide this distributed infra-structure for the data collection, ensuring modularity, scalability and reconfigurability capabilities. This paper introduces a multi-agent system approach to create a modular and scalable sensing system, based on a diversity of real and soft sensors, to support the monitoring of temperature in thin-film sensing surfaces. The proposed approach was experimentally tested in a plastic injection process, presenting promising results in terms of accuracy and response time, and allowing to obtain more sampling points through the use of computational techniques to complement the real data.","PeriodicalId":443337,"journal":{"name":"IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society","volume":"107 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120874438","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 : 2021-10-13DOI: 10.1109/IECON48115.2021.9589931
Jingjing Lu, Yan Gao, Luyu Zhang, Kai Li, C. Yin
A data-driven strategy for diagnosing the water management failure in a Proton Exchange Membrane Fuel Cell (PEMFC) is proposed in this paper. In the proposed diagnosis approach, individual cell voltages are used as the variables for diagnosis. A dimension reduction tool, named principal component analysis (PCA), is used to extract important feature information from diagnostic variables collected at different time points. The pattern recognition tool, named support vector data description (SVDD), is then used to construct hyperspheres, each of which tightly contains a certain kind of data in the feature space. A multi-classification decision strategy, which considers the size of the hypersphere and the distance from the sample to the hypersphere center, is finally proposed to realize fault detection. The experimental results show that the PEMFC stack water management fault can be successfully diagnosed and distinguished based on the PCA and SVDD multi-classification fault diagnosis strategy.
{"title":"PEMFC water management fault diagnosis method based on principal component analysis and support vector data description","authors":"Jingjing Lu, Yan Gao, Luyu Zhang, Kai Li, C. Yin","doi":"10.1109/IECON48115.2021.9589931","DOIUrl":"https://doi.org/10.1109/IECON48115.2021.9589931","url":null,"abstract":"A data-driven strategy for diagnosing the water management failure in a Proton Exchange Membrane Fuel Cell (PEMFC) is proposed in this paper. In the proposed diagnosis approach, individual cell voltages are used as the variables for diagnosis. A dimension reduction tool, named principal component analysis (PCA), is used to extract important feature information from diagnostic variables collected at different time points. The pattern recognition tool, named support vector data description (SVDD), is then used to construct hyperspheres, each of which tightly contains a certain kind of data in the feature space. A multi-classification decision strategy, which considers the size of the hypersphere and the distance from the sample to the hypersphere center, is finally proposed to realize fault detection. The experimental results show that the PEMFC stack water management fault can be successfully diagnosed and distinguished based on the PCA and SVDD multi-classification fault diagnosis strategy.","PeriodicalId":443337,"journal":{"name":"IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society","volume":"15 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121006290","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 : 2021-10-13DOI: 10.1109/IECON48115.2021.9589548
I. Verbytskyi, A. Blinov, D. Vinnikov, D. Peftitsis
This paper presents a detailed analysis of a series LC resonant isolated current source converter (SR-CSC) with the focus on a buck operation mode. Topologies of this type are generally proposed for PV, fuel cell, battery charging or DC microgrid applications. The switching processes on the example of the full-bridge topology are described and the corresponding mathematical equations derived. Further, the operational parameters of the converter, including switching frequency as well as transistor voltage and current stresses are estimated. The performed analysis is may be used to determine the component values for the optimal design of the DC-DC converter for a case study system. The obtained findings are verified with a simulation model of a 3.3 kVA SR-CSC.
{"title":"Operation and Design of Series-Resonant Current-Source Full-Bridge DC-DC Converter","authors":"I. Verbytskyi, A. Blinov, D. Vinnikov, D. Peftitsis","doi":"10.1109/IECON48115.2021.9589548","DOIUrl":"https://doi.org/10.1109/IECON48115.2021.9589548","url":null,"abstract":"This paper presents a detailed analysis of a series LC resonant isolated current source converter (SR-CSC) with the focus on a buck operation mode. Topologies of this type are generally proposed for PV, fuel cell, battery charging or DC microgrid applications. The switching processes on the example of the full-bridge topology are described and the corresponding mathematical equations derived. Further, the operational parameters of the converter, including switching frequency as well as transistor voltage and current stresses are estimated. The performed analysis is may be used to determine the component values for the optimal design of the DC-DC converter for a case study system. The obtained findings are verified with a simulation model of a 3.3 kVA SR-CSC.","PeriodicalId":443337,"journal":{"name":"IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society","volume":"152 9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114062097","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 : 2021-10-13DOI: 10.1109/IECON48115.2021.9589626
S. Nishizawa, T. Satoh, N. Saito, J. Nagase, N. Saga
We propose a design method of a novel unknown-input estimator (UIE) based on artificial bee colony (ABC) algorithm considering the stability of the initial colony. To ensure that every bee in the initial colony results in a stable UIE system, we modify the computation. The modification include the reformulation of the UIE and a limited choice of the subsystem. The numerical example shows that the proposed design method can design the UIE more efficiently than the existing method.
{"title":"Design of ABC algorithm-based Unknown-Input Estimator considering stability of initial colony","authors":"S. Nishizawa, T. Satoh, N. Saito, J. Nagase, N. Saga","doi":"10.1109/IECON48115.2021.9589626","DOIUrl":"https://doi.org/10.1109/IECON48115.2021.9589626","url":null,"abstract":"We propose a design method of a novel unknown-input estimator (UIE) based on artificial bee colony (ABC) algorithm considering the stability of the initial colony. To ensure that every bee in the initial colony results in a stable UIE system, we modify the computation. The modification include the reformulation of the UIE and a limited choice of the subsystem. The numerical example shows that the proposed design method can design the UIE more efficiently than the existing method.","PeriodicalId":443337,"journal":{"name":"IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114641646","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 : 2021-10-13DOI: 10.1109/IECON48115.2021.9589154
S. Mohamadian, Carlo Cecati
Several modelling approaches of multiphase machines have been proposed in literature to control the machine in healthy or faulty conditions. The variety of the models may confuse the researchers to select the proper ones. In this paper, vector space decomposition (VSD), multi-star (MS), and decoupled MS (DMS) models are developed with detailed explanations for triple three-phase (or asymmetric nine-phase) permanent magnet synchronous machine (PMSM). It is shown that the machine differential equations are not fully decoupled in DMS modelling. The presented approaches can be extended to any types of multiple three-phase PMSM. Also, two new models are introduced with the use of specific transformation matrices in order to provide the current sharing between different three-phase winding sets and for compensation of current harmonics arising from inverter nonlinearities or machine structure. These models are necessary to design the parameters of the control system in order to have the optimum dynamic response.
{"title":"Modelling, Harmonic Compensation, and Current Sharing Between Winding Sets of Asymmetric Nine-Phase PMSM","authors":"S. Mohamadian, Carlo Cecati","doi":"10.1109/IECON48115.2021.9589154","DOIUrl":"https://doi.org/10.1109/IECON48115.2021.9589154","url":null,"abstract":"Several modelling approaches of multiphase machines have been proposed in literature to control the machine in healthy or faulty conditions. The variety of the models may confuse the researchers to select the proper ones. In this paper, vector space decomposition (VSD), multi-star (MS), and decoupled MS (DMS) models are developed with detailed explanations for triple three-phase (or asymmetric nine-phase) permanent magnet synchronous machine (PMSM). It is shown that the machine differential equations are not fully decoupled in DMS modelling. The presented approaches can be extended to any types of multiple three-phase PMSM. Also, two new models are introduced with the use of specific transformation matrices in order to provide the current sharing between different three-phase winding sets and for compensation of current harmonics arising from inverter nonlinearities or machine structure. These models are necessary to design the parameters of the control system in order to have the optimum dynamic response.","PeriodicalId":443337,"journal":{"name":"IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116266662","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 : 2021-10-13DOI: 10.1109/IECON48115.2021.9589428
Nina Liu, Hong Wang, Xiaoyong Zheng, Zhe Chen
AC side impedance modelling of an HVDC converter station usually ignores the DC-side dynamics, instead, the dynamics characteristic of cable and another converter station is represented as a constant power source or a constant voltage source. The influence of DC-side power network dynamics for AC-side small-signal stability is not yet well analysed. This paper presents a three-port transfer matrix model of the three-phase voltage source converter (VSC) which intuitively characterizes both AC- and DC-side dynamics by relating AC- and DC-side current and voltages. This model not only derive the equivalent impedance of the DC-side power network but also easily obtain a modified AC impedance model of VSC considering the impedance characteristic of the DC-side network. With comparing the impedance characteristics of the modified impedance model and the original impedance model, this paper shows that if the DC-side dynamics are ignored in an HVDC system, it may lead to an incorrect result of stability assessment. The proposed three-port transfer matrix model simplifies the impedance modelling process of the HVDC transmission system and the modified AC impedance model provides accurate stability analysis of the HVDC transmission system. Simulation results are given to validate the correctness of the proposed impedance model and the effectiveness of the modified AC impedance model for stability analysis.
{"title":"An Impedance Model of a VSC-HVDC System Considering DC-side Dynamics for AC grid Stability Analysis","authors":"Nina Liu, Hong Wang, Xiaoyong Zheng, Zhe Chen","doi":"10.1109/IECON48115.2021.9589428","DOIUrl":"https://doi.org/10.1109/IECON48115.2021.9589428","url":null,"abstract":"AC side impedance modelling of an HVDC converter station usually ignores the DC-side dynamics, instead, the dynamics characteristic of cable and another converter station is represented as a constant power source or a constant voltage source. The influence of DC-side power network dynamics for AC-side small-signal stability is not yet well analysed. This paper presents a three-port transfer matrix model of the three-phase voltage source converter (VSC) which intuitively characterizes both AC- and DC-side dynamics by relating AC- and DC-side current and voltages. This model not only derive the equivalent impedance of the DC-side power network but also easily obtain a modified AC impedance model of VSC considering the impedance characteristic of the DC-side network. With comparing the impedance characteristics of the modified impedance model and the original impedance model, this paper shows that if the DC-side dynamics are ignored in an HVDC system, it may lead to an incorrect result of stability assessment. The proposed three-port transfer matrix model simplifies the impedance modelling process of the HVDC transmission system and the modified AC impedance model provides accurate stability analysis of the HVDC transmission system. Simulation results are given to validate the correctness of the proposed impedance model and the effectiveness of the modified AC impedance model for stability analysis.","PeriodicalId":443337,"journal":{"name":"IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121555596","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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