Pub Date : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709464
Darius Muyizere, Lawrence K. Letting, B. Munyazikwiye
This paper analyses the load shedding methods for the impact of communication delays. Therefore, the research investigates the impacts and effects of communication networks in the grid systems which might cause imperfections such as delays and noise among others related to relays. The model of the power system and the design of the controllers are done using Simulink, the Matlab software. The controllers are designed to output power imbalance based on frequency deviation during various systems under frequency conditions. They also shed loads continuously until the frequency is restored within the safe operating range. Different cases of the system under frequency are used to analyze the performance of the grasshopper optimization algorithm (GOA) proposal based on under-frequency load Shedding UFLS, a comparison with Traditional and particle swarm optimization (PSO). UFLS is performed due to various disturbances. It has been found that a GOA method provides excellent communication networks and reduces the size of the load is shed. Moreover, and what’s more, GOA achieves the fastest solution we’ve ever used in IEEE 14 Bus system.
{"title":"Under-frequency Load Shedding on the Performance Time Delay Relays of Transmission lines with difference Controllers","authors":"Darius Muyizere, Lawrence K. Letting, B. Munyazikwiye","doi":"10.1109/SPEC52827.2021.9709464","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709464","url":null,"abstract":"This paper analyses the load shedding methods for the impact of communication delays. Therefore, the research investigates the impacts and effects of communication networks in the grid systems which might cause imperfections such as delays and noise among others related to relays. The model of the power system and the design of the controllers are done using Simulink, the Matlab software. The controllers are designed to output power imbalance based on frequency deviation during various systems under frequency conditions. They also shed loads continuously until the frequency is restored within the safe operating range. Different cases of the system under frequency are used to analyze the performance of the grasshopper optimization algorithm (GOA) proposal based on under-frequency load Shedding UFLS, a comparison with Traditional and particle swarm optimization (PSO). UFLS is performed due to various disturbances. It has been found that a GOA method provides excellent communication networks and reduces the size of the load is shed. Moreover, and what’s more, GOA achieves the fastest solution we’ve ever used in IEEE 14 Bus system.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120961863","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709449
Abdelmoumin Allioua, G. Griepentrog, M. Vögel, Julian Eitler, Nejat Mahdavi
The coupling method used to superimpose and separate the data signal to and from the powerline plays a crucial role concerning the channel frequency response, the coupling efficiency, and also preserving the signal integrity against the peaks and notches caused by reflections, which will cancel certain carrier frequencies at the receiver. Furthermore, the coupling unit should be bi-directional to allow the signals coupling regardless the direction of data flow, likewise it needs to accomplish galvanic isolation together with transient protection, and offers more degrees of freedom to impedance-matching, as well as allocating less space and achieve high bandwidth for broadband coupling. This paper discusses an approach to pursue toward designing a printed-circuit board (PCB)-based planar coil inductive coupler with wide bandwidth for data transfer.The designed coupler will eventually be used to implement powerline communication (PLC) adequately for airborne use, where a real-case context study was investigated, also PLC implementation and tests were conducted as well as discussed from latency, bit error rate (BER) and electromagnetic compatibility (EMC) compliance perspective with the RTCA DO-160G standard requirements.
{"title":"Design of PCB-based planar coil inductive coupler","authors":"Abdelmoumin Allioua, G. Griepentrog, M. Vögel, Julian Eitler, Nejat Mahdavi","doi":"10.1109/SPEC52827.2021.9709449","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709449","url":null,"abstract":"The coupling method used to superimpose and separate the data signal to and from the powerline plays a crucial role concerning the channel frequency response, the coupling efficiency, and also preserving the signal integrity against the peaks and notches caused by reflections, which will cancel certain carrier frequencies at the receiver. Furthermore, the coupling unit should be bi-directional to allow the signals coupling regardless the direction of data flow, likewise it needs to accomplish galvanic isolation together with transient protection, and offers more degrees of freedom to impedance-matching, as well as allocating less space and achieve high bandwidth for broadband coupling. This paper discusses an approach to pursue toward designing a printed-circuit board (PCB)-based planar coil inductive coupler with wide bandwidth for data transfer.The designed coupler will eventually be used to implement powerline communication (PLC) adequately for airborne use, where a real-case context study was investigated, also PLC implementation and tests were conducted as well as discussed from latency, bit error rate (BER) and electromagnetic compatibility (EMC) compliance perspective with the RTCA DO-160G standard requirements.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123743893","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709476
Meilin Hu, U. Madawala, C. Baguley
Ferrite is generally added to the transmitting and receiving coils used for inductive power transfer (IPT) to improve magnetic performance. To reduce coil weight and cost, finite element method (FEM) modelling may be employed to minimize the amount of ferrite used and optimize its placement. However, this approach is time-consuming and provides very limited design insight. Therefore, this paper proposes an analytical approach, based on magnetic reluctance, to aid in the design of IPT coils. It is based on modelling the air gap between transmitting and receiving coils as a network of reluctances, and facilitates design insight through allowing key analytical relationships between magnetic field and coil design parameters to be developed. Results from the proposed analytical model are benchmarked against those from FEM for an IPT coil implemented with a circular winding and with commonly used ferrite strips. The results verify the accuracy of the proposed analytical model.
{"title":"A Reluctance-based Model for the Design of Inductive Power Transfer Coils","authors":"Meilin Hu, U. Madawala, C. Baguley","doi":"10.1109/SPEC52827.2021.9709476","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709476","url":null,"abstract":"Ferrite is generally added to the transmitting and receiving coils used for inductive power transfer (IPT) to improve magnetic performance. To reduce coil weight and cost, finite element method (FEM) modelling may be employed to minimize the amount of ferrite used and optimize its placement. However, this approach is time-consuming and provides very limited design insight. Therefore, this paper proposes an analytical approach, based on magnetic reluctance, to aid in the design of IPT coils. It is based on modelling the air gap between transmitting and receiving coils as a network of reluctances, and facilitates design insight through allowing key analytical relationships between magnetic field and coil design parameters to be developed. Results from the proposed analytical model are benchmarked against those from FEM for an IPT coil implemented with a circular winding and with commonly used ferrite strips. The results verify the accuracy of the proposed analytical model.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122642864","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709454
Bingkun Song, Lei Wang, U. Madawala, C. Baguley
For many distribution network operators (DNOs), the phases to which single-phase loads are connected is unknown. This can present a problem in terms of unbalanced loading across phases, which will be significantly exacerbated by the future impact of large-scale electric vehicle (EV) charging loads. In addition, the implementation of EV charging systems can give rise to the presence of significant harmonics on power systems, as a result of converter operation. Therefore, this paper proposes a fast EV charging technique that incorporates phase balancing and harmonic suppression features. This allows multiple and important functions that are necessary for the improved operation of a local distribution network to be achieved through the installation of a single unit. Consequently, units based on the proposed technique suit the large-scale and strategic deployment in distribution networks. The paper describes the technique in detail, presenting relevant theory and the control strategy. To demonstrate the applicability of the proposed technique, simulated results of a 50 kW fast EV charger are presented under various unbalanced load conditions.
{"title":"A Multi-functional Fast Electric Vehicle Charging Technique","authors":"Bingkun Song, Lei Wang, U. Madawala, C. Baguley","doi":"10.1109/SPEC52827.2021.9709454","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709454","url":null,"abstract":"For many distribution network operators (DNOs), the phases to which single-phase loads are connected is unknown. This can present a problem in terms of unbalanced loading across phases, which will be significantly exacerbated by the future impact of large-scale electric vehicle (EV) charging loads. In addition, the implementation of EV charging systems can give rise to the presence of significant harmonics on power systems, as a result of converter operation. Therefore, this paper proposes a fast EV charging technique that incorporates phase balancing and harmonic suppression features. This allows multiple and important functions that are necessary for the improved operation of a local distribution network to be achieved through the installation of a single unit. Consequently, units based on the proposed technique suit the large-scale and strategic deployment in distribution networks. The paper describes the technique in detail, presenting relevant theory and the control strategy. To demonstrate the applicability of the proposed technique, simulated results of a 50 kW fast EV charger are presented under various unbalanced load conditions.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133573895","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709437
Pedro Catalán, Yanbo Wang, Zhe Chen, J. Arza
Model predictive control (MPC) has been previously proposed as an effective solution to perform power control for neutral-point-clamped (NPC) converter-based wind turbine. However, the appropriate control of switching frequency and the tuning of the weighting factors in the cost function are challenging and the study of stability is intrinsically complicated. This paper presents a design guideline of MPC-based power control strategy for NPC converter-wind turbine with online tuning to optimize switching frequency. Furthermore, the dynamic response of the MPC system is evaluated at different operating points and grid impedances. The frequency-scanning technique is proposed to validate the stability of the system. Finally, simulation results are given to validate the proposed MPC strategy for NPC converter-based wind turbine.
{"title":"Model Predictive Control Strategy for NPC Converter-based Wind Turbine with Switching Frequency Control","authors":"Pedro Catalán, Yanbo Wang, Zhe Chen, J. Arza","doi":"10.1109/SPEC52827.2021.9709437","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709437","url":null,"abstract":"Model predictive control (MPC) has been previously proposed as an effective solution to perform power control for neutral-point-clamped (NPC) converter-based wind turbine. However, the appropriate control of switching frequency and the tuning of the weighting factors in the cost function are challenging and the study of stability is intrinsically complicated. This paper presents a design guideline of MPC-based power control strategy for NPC converter-wind turbine with online tuning to optimize switching frequency. Furthermore, the dynamic response of the MPC system is evaluated at different operating points and grid impedances. The frequency-scanning technique is proposed to validate the stability of the system. Finally, simulation results are given to validate the proposed MPC strategy for NPC converter-based wind turbine.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134178120","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709486
Arvind H Kadam, S. Williamson
Nowadays, the LCL (inductor-capacitor-inductor) filter is an integral part of every power electronic converter system operating on current control. Though higher order, the LCL filter due to its high harmonic suppression capability are widely adopted in back-to-back converter systems or grid connected converter systems. Normally, with LCL filter, the control system follows double closed loop with outer loop controlling DC voltage and inner loop controlling AC current. However, for some special applications like common DC-bus-configured motor emulator (ME) system, the DC bus voltage is not required to be controlled. In addition, the presence of LCL filter introduces cross coupling of flux and torque component in case of AC motor emulation. The double closed loop control is generally adopted to decouple torque and flux components, however the controller design is more complex process. Therefore, this paper presents a single loop control of a common DC-bus-configured ME system with LCL filter based on state feedback linearization method. The decoupling equations in direct and quadrature axis are derived here. The simulation results presented for a 2.0 kW PMSM motor validate the stability as well as closed loop operation of the system with single loop control.
{"title":"Single Loop Control of a Common DC-Bus-Configured Traction Motor Emulator Using State Feedback Linearization Method","authors":"Arvind H Kadam, S. Williamson","doi":"10.1109/SPEC52827.2021.9709486","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709486","url":null,"abstract":"Nowadays, the LCL (inductor-capacitor-inductor) filter is an integral part of every power electronic converter system operating on current control. Though higher order, the LCL filter due to its high harmonic suppression capability are widely adopted in back-to-back converter systems or grid connected converter systems. Normally, with LCL filter, the control system follows double closed loop with outer loop controlling DC voltage and inner loop controlling AC current. However, for some special applications like common DC-bus-configured motor emulator (ME) system, the DC bus voltage is not required to be controlled. In addition, the presence of LCL filter introduces cross coupling of flux and torque component in case of AC motor emulation. The double closed loop control is generally adopted to decouple torque and flux components, however the controller design is more complex process. Therefore, this paper presents a single loop control of a common DC-bus-configured ME system with LCL filter based on state feedback linearization method. The decoupling equations in direct and quadrature axis are derived here. The simulation results presented for a 2.0 kW PMSM motor validate the stability as well as closed loop operation of the system with single loop control.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115236121","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709439
Yanling Li, X. Dai, Ning Wang, Yiming Jiang
The multi-excitation unit wireless power system is widely used to improve the flexibility of power distribution. This paper establishes the design method of coupling mechanism based on multi-excitation unit matrix wireless power system. By the optimization of different number of primary coils used, the optimal charging area can be determined. Finally, validate the effectiveness of the method through the simulation and experiments.
{"title":"Coupling Mechanism Multi-Objective Optimization Design on Multi-Excitation Units in Wireless Power Transfer System","authors":"Yanling Li, X. Dai, Ning Wang, Yiming Jiang","doi":"10.1109/SPEC52827.2021.9709439","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709439","url":null,"abstract":"The multi-excitation unit wireless power system is widely used to improve the flexibility of power distribution. This paper establishes the design method of coupling mechanism based on multi-excitation unit matrix wireless power system. By the optimization of different number of primary coils used, the optimal charging area can be determined. Finally, validate the effectiveness of the method through the simulation and experiments.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116732974","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709452
Bouazza Fekkak, A. Loukriz, R. Kennel, Hakim Azoug, A. Kouzou, Mohamed Abdelrahem, Mostefa Mohamed-Seghir, H. Belmili, M. Menaa
In this paper a Single-Phase nine level inverter based on conventional single-phase H-bridge topology is proposed. It is dedicated to be used for ensuring the connection of single AC load to photovoltaic system. The proposed inverter system features less of switches number and a new auxiliary switches conception. Hence, it gives better voltage regulation, smooth operation and efficient yield compared to multi-level inverters. The proposed inverter topology is capable of producing nine levels of output voltage levels. This inverter is firstly simulated under MATLAB/ Simulink software, thereafter, co-simulated using the Processor-in-the-loop (PIL) technique. Secondly, the proposed inverter is designed and tested experimentally. The inverter control is implemented on the high-speed ARM-STM32F407 board. Based on the obtained results, it can be seen clearly that co-simulation results are matching experimental results, which proves the validity of the proposed multi-level inverter. This topology can be extended for more number of phases and levels.
{"title":"Processor-in-the Loop Test and Experimental Validations for developed Nine level PV Inverter using High Performance ARM-STM32F407","authors":"Bouazza Fekkak, A. Loukriz, R. Kennel, Hakim Azoug, A. Kouzou, Mohamed Abdelrahem, Mostefa Mohamed-Seghir, H. Belmili, M. Menaa","doi":"10.1109/SPEC52827.2021.9709452","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709452","url":null,"abstract":"In this paper a Single-Phase nine level inverter based on conventional single-phase H-bridge topology is proposed. It is dedicated to be used for ensuring the connection of single AC load to photovoltaic system. The proposed inverter system features less of switches number and a new auxiliary switches conception. Hence, it gives better voltage regulation, smooth operation and efficient yield compared to multi-level inverters. The proposed inverter topology is capable of producing nine levels of output voltage levels. This inverter is firstly simulated under MATLAB/ Simulink software, thereafter, co-simulated using the Processor-in-the-loop (PIL) technique. Secondly, the proposed inverter is designed and tested experimentally. The inverter control is implemented on the high-speed ARM-STM32F407 board. Based on the obtained results, it can be seen clearly that co-simulation results are matching experimental results, which proves the validity of the proposed multi-level inverter. This topology can be extended for more number of phases and levels.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115297223","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709469
Karamat Adavi, Christian Kessler, R. Ruf
This article presents a non-isolated 650W DC-DC converter with an input voltage range of 150V until 700V. A novel buck-boost topology with two low-side MOSFETs was designed by combining the classical buck topology and boost topology. This novel topology configuration has an advantage in selecting gate driver integrated circuit (IC), since the IC does not need to provide high-side gate signals. To control gate signals of the two low-side MOSFETs, a new analog control circuitry was proposed and implemented. A 290V output voltage and 650W output power prototype were fabricated to evaluate the effectiveness of the proposed converter. The measurements are validated a peak efficiency of 98.11% in boost mode and 97.45% in buck mode at a switching frequency of 100kHz.
{"title":"A non-isolated 650W DC-DC converter using a novel buck-boost topology with two low-side MOSFETs","authors":"Karamat Adavi, Christian Kessler, R. Ruf","doi":"10.1109/SPEC52827.2021.9709469","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709469","url":null,"abstract":"This article presents a non-isolated 650W DC-DC converter with an input voltage range of 150V until 700V. A novel buck-boost topology with two low-side MOSFETs was designed by combining the classical buck topology and boost topology. This novel topology configuration has an advantage in selecting gate driver integrated circuit (IC), since the IC does not need to provide high-side gate signals. To control gate signals of the two low-side MOSFETs, a new analog control circuitry was proposed and implemented. A 290V output voltage and 650W output power prototype were fabricated to evaluate the effectiveness of the proposed converter. The measurements are validated a peak efficiency of 98.11% in boost mode and 97.45% in buck mode at a switching frequency of 100kHz.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123485900","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}
Small signal analysis methods in frequency domain and time domain have been frequently proposed to identify stability issue of grid-connected inverter. However, it fails to deal with nonlinear characteristics caused by variation of different operating points. This paper presents a nonlinear stability analysis method to investigate the effects of nonlinear components on stability of grid-connected inverter, where the nonlinearity of inductor is addressed as an example to investigate the nonlinear stability mechanism. The model of nonlinear inductor is first established by describing function method. Then, the transfer function with nonlinear plant and linear plant is established by loop transformation method. Moreover, the nonlinear stability criterion is developed by identifying the relationship of describing function of nonlinear plant and Nyquist diagram of linear plant. Simulation and experimental results validate the effectiveness of the proposed nonlinear stability analysis method, which can provide the guideline to optimize inverter parameters at design stage so as to avoid the potential instability issues caused by nonlinear components.
{"title":"A Nonlinear Stability Analysis Method of Grid-Connected Inverter","authors":"Yanbo Wang, Dong Liu, Zhan Shen, Qi Zhang, F. Deng, Zhe Chen","doi":"10.1109/SPEC52827.2021.9709445","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709445","url":null,"abstract":"Small signal analysis methods in frequency domain and time domain have been frequently proposed to identify stability issue of grid-connected inverter. However, it fails to deal with nonlinear characteristics caused by variation of different operating points. This paper presents a nonlinear stability analysis method to investigate the effects of nonlinear components on stability of grid-connected inverter, where the nonlinearity of inductor is addressed as an example to investigate the nonlinear stability mechanism. The model of nonlinear inductor is first established by describing function method. Then, the transfer function with nonlinear plant and linear plant is established by loop transformation method. Moreover, the nonlinear stability criterion is developed by identifying the relationship of describing function of nonlinear plant and Nyquist diagram of linear plant. Simulation and experimental results validate the effectiveness of the proposed nonlinear stability analysis method, which can provide the guideline to optimize inverter parameters at design stage so as to avoid the potential instability issues caused by nonlinear components.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130556232","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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