Pub Date : 2021-11-13DOI: 10.1109/peas53589.2021.9628730
W. Zihan, Zhao Mi, Liu XiMu, Lu Min
The sensorless control methods in terms of the traditional sliding mode observer (SMO) will usually produce a large number of high frequency harmonics and integral saturation problems, which will lead to a large deviation of the estimated speed of the drive system and poor dynamic performance. Hence, a novel variable proportional desaturation proportional integral (VPDPI) speed regulator design method based on SMO with phase-locked loop (PLL) is proposed in this paper. Firstly, the PLL-SMO speed sensorless observation method is designed by self-closed-loop phase angle prediction, which greatly weakens the high frequency chattering caused by traditional SMO observation under PMSM vector control. Unfortunately, the integral saturation would be intensified due to the introduction of the PLL. To achieve it, a novel VPDPI speed regulator is further designed by combining the self-judging multi-mode switching mode with the concept of threshold segmentation, which ensures that the saturation problem in the PLL and the whole drive system can be totally eliminated. The experimental results indicate that the proposed sensorless drive system based on VPDPI regulator can accurately track the actual speed. Meanwhile, compared with the traditional PI control effect, it has better speed response performance.
{"title":"Speed Control for PMSM Drive System Based on Sliding Mode Observer with Phase-Locked Loop and Variable Proportional Desaturation PI Regulator","authors":"W. Zihan, Zhao Mi, Liu XiMu, Lu Min","doi":"10.1109/peas53589.2021.9628730","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628730","url":null,"abstract":"The sensorless control methods in terms of the traditional sliding mode observer (SMO) will usually produce a large number of high frequency harmonics and integral saturation problems, which will lead to a large deviation of the estimated speed of the drive system and poor dynamic performance. Hence, a novel variable proportional desaturation proportional integral (VPDPI) speed regulator design method based on SMO with phase-locked loop (PLL) is proposed in this paper. Firstly, the PLL-SMO speed sensorless observation method is designed by self-closed-loop phase angle prediction, which greatly weakens the high frequency chattering caused by traditional SMO observation under PMSM vector control. Unfortunately, the integral saturation would be intensified due to the introduction of the PLL. To achieve it, a novel VPDPI speed regulator is further designed by combining the self-judging multi-mode switching mode with the concept of threshold segmentation, which ensures that the saturation problem in the PLL and the whole drive system can be totally eliminated. The experimental results indicate that the proposed sensorless drive system based on VPDPI regulator can accurately track the actual speed. Meanwhile, compared with the traditional PI control effect, it has better speed response performance.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132908721","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 : 2021-11-13DOI: 10.1109/peas53589.2021.9628724
Hui Yuan, Xiaohui Qin, Wenfeng Li, Lining Su, Guangjin Shen, H. Xin
Recently, the increasing penetration of the renewable energy generation, i.e., inverter-based resources (IBRs), is challenging the grid operation. Besides, static var generators (SVGs), due to its high flexibility and controllability, have been widely-used in renewable energy generation for providing voltage support. However, the strong interaction among grid-following IBRs and SVGs may cause serious small signal stability issues, especially in weak grids. To ensure the secure operation of modern power systems, it is important to analyze the small signal stability of grid-tied IBRs with SVGs. This paper proposes a short-circuit ratio (SCR) based method for quantifying small signal stability of a single-IBR infinite-bus system (SIIBS) with a SVG located at arbitrary bus, in which SCR is a metric for quantifying small signal stability of a SIIBS from the viewpoint of grid strength. Furthermore, the key factors for the impact of a SVG on the stability of a SIIBS are investigated from the viewpoint of grid strength. Simulation results based on MATLAB/Simulink verifies the efficacy of the proposed SCR- based method.
{"title":"Small Signal Stability Analysis of Grid-Following Inverter-Based Resources in Weak Grids With SVGs Based on Grid Strength Assessment","authors":"Hui Yuan, Xiaohui Qin, Wenfeng Li, Lining Su, Guangjin Shen, H. Xin","doi":"10.1109/peas53589.2021.9628724","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628724","url":null,"abstract":"Recently, the increasing penetration of the renewable energy generation, i.e., inverter-based resources (IBRs), is challenging the grid operation. Besides, static var generators (SVGs), due to its high flexibility and controllability, have been widely-used in renewable energy generation for providing voltage support. However, the strong interaction among grid-following IBRs and SVGs may cause serious small signal stability issues, especially in weak grids. To ensure the secure operation of modern power systems, it is important to analyze the small signal stability of grid-tied IBRs with SVGs. This paper proposes a short-circuit ratio (SCR) based method for quantifying small signal stability of a single-IBR infinite-bus system (SIIBS) with a SVG located at arbitrary bus, in which SCR is a metric for quantifying small signal stability of a SIIBS from the viewpoint of grid strength. Furthermore, the key factors for the impact of a SVG on the stability of a SIIBS are investigated from the viewpoint of grid strength. Simulation results based on MATLAB/Simulink verifies the efficacy of the proposed SCR- based method.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133627196","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 : 2021-11-13DOI: 10.1109/peas53589.2021.9628723
Yuancan Xu, Yandong Chen, Wenhua Wu, Shixiang Cao, Fei Yang
This article presents a complex-valued phasor domain admittance modeling technique for the equivalent circuit modeling and dynamic stability analysis of a single-phase grid-tied voltage-source converters system considering infinite-order frequency-coupling (IOFC). The basis is the symmetric structure of admittance model in rotating phasor domain, whose complex-valued admittance component can capture the frequency coupling effect. Thereafter, the equivalent circuit model (ECM) considering IOFC is established by analyzing the mechanism of coupling phenomena in detail. The proposed ECM model provides an insightful physical recognition to illustrate IOFC effect. Besides, the model is single-input and single-output (SISO), which facilitates measurement and analysis. It is found that high-order coupled frequency components are produced by low-order coupled frequency components, and its impact declines with the increase of order, which provides instruction for model order truncation. Further on, the influences of grid stiffness, phase-locked-loop bandwidth, and reference current are analyzed. These results show that the system is more likely to be unstable and the frequency coupling phenomenon is easier to be observed when the system is under weaker grid stiffness, wider PLL bandwidth, or larger reference current. Finally, experiments verified the established model and dynamic stability analysis.
{"title":"Equivalent Circuit Modeling Considered Infinite Frequencies Coupling Effects in Complex Phasor Domain","authors":"Yuancan Xu, Yandong Chen, Wenhua Wu, Shixiang Cao, Fei Yang","doi":"10.1109/peas53589.2021.9628723","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628723","url":null,"abstract":"This article presents a complex-valued phasor domain admittance modeling technique for the equivalent circuit modeling and dynamic stability analysis of a single-phase grid-tied voltage-source converters system considering infinite-order frequency-coupling (IOFC). The basis is the symmetric structure of admittance model in rotating phasor domain, whose complex-valued admittance component can capture the frequency coupling effect. Thereafter, the equivalent circuit model (ECM) considering IOFC is established by analyzing the mechanism of coupling phenomena in detail. The proposed ECM model provides an insightful physical recognition to illustrate IOFC effect. Besides, the model is single-input and single-output (SISO), which facilitates measurement and analysis. It is found that high-order coupled frequency components are produced by low-order coupled frequency components, and its impact declines with the increase of order, which provides instruction for model order truncation. Further on, the influences of grid stiffness, phase-locked-loop bandwidth, and reference current are analyzed. These results show that the system is more likely to be unstable and the frequency coupling phenomenon is easier to be observed when the system is under weaker grid stiffness, wider PLL bandwidth, or larger reference current. Finally, experiments verified the established model and dynamic stability analysis.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134645334","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 : 2021-11-13DOI: 10.1109/peas53589.2021.9628585
Chao Zhang, Xin Xie, Kun Qu, Bo Hu, Zongjian Li, Jun Wang
In this paper, a hybrid Si/SiC continuous conduction mode (CCM) interleaved totem-pole bridgeless PFC converter is proposed, which is consists of a small-capacity highfrequency SiC phase and a large-capacity low-frequency Si phase, instead of two identical SiC phases in conventional design. Thus, it has a lower total cost compared to the all-SiC interleaved TPBPFC converter. Meanwhile, a coupled inductor is applied to simplify the structure and further reduce the cost of magnetic components. A new hybrid-frequency interleaving technique is developed to coordinate the Si and SiC phase operations and offer an improved tradeoff between cost and performance. Furthermore, a master-slave control structure, which combines the average current mode control (ACMC) and modulated model predictive control (MMPC), is proposed to implement the proposed hybrid-frequency unique technique. A 3kW prototype has been built to verify the effectiveness and advantages of the proposed TPBPFC converter and control strategy.
{"title":"A Hybrid Si/SiC CCM Interleaved Totem-Pole Bridgeless PFC Converter with Coupled-Inductor and Hybrid-Frequency Interleaving Operation","authors":"Chao Zhang, Xin Xie, Kun Qu, Bo Hu, Zongjian Li, Jun Wang","doi":"10.1109/peas53589.2021.9628585","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628585","url":null,"abstract":"In this paper, a hybrid Si/SiC continuous conduction mode (CCM) interleaved totem-pole bridgeless PFC converter is proposed, which is consists of a small-capacity highfrequency SiC phase and a large-capacity low-frequency Si phase, instead of two identical SiC phases in conventional design. Thus, it has a lower total cost compared to the all-SiC interleaved TPBPFC converter. Meanwhile, a coupled inductor is applied to simplify the structure and further reduce the cost of magnetic components. A new hybrid-frequency interleaving technique is developed to coordinate the Si and SiC phase operations and offer an improved tradeoff between cost and performance. Furthermore, a master-slave control structure, which combines the average current mode control (ACMC) and modulated model predictive control (MMPC), is proposed to implement the proposed hybrid-frequency unique technique. A 3kW prototype has been built to verify the effectiveness and advantages of the proposed TPBPFC converter and control strategy.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124490732","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 : 2021-11-13DOI: 10.1109/peas53589.2021.9628663
Zhibo Zhu, Xingfa Liu, Wei Yan, Yang Zhao, Wanning Bai
Switched-mode power supply (SMPS) has been widely used in power electronic equipment. The radiated electromagnetic interference (EMI) in complex external environment seriously affects the normal operation of the SMPS, which can be suppressed by adding a metal shell outside the SMPS. However, in order to meet the requirement of the heat dissipation, holes are opened in the metal shell, and the external radiated EMI enters into the shell through the holes, reducing the shielding effectiveness (SE) of the shell. In this paper, a new method to optimize the shielding effectiveness of the switched-mode power supply based on particle swarm optimization (PSO) algorithm is proposed. The influence of the metal shell opening mode on shielding effectiveness is studied, and the simulation results verify the effectiveness of the proposed method. In addition, the position arrangement of the hole array on the shell is studied, which further improves the shielding effectiveness of the SMPS.
{"title":"Research on Shielding Effectiveness of Switched-Mode Power Supply based on Particle Swarm Optimization Algorithm","authors":"Zhibo Zhu, Xingfa Liu, Wei Yan, Yang Zhao, Wanning Bai","doi":"10.1109/peas53589.2021.9628663","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628663","url":null,"abstract":"Switched-mode power supply (SMPS) has been widely used in power electronic equipment. The radiated electromagnetic interference (EMI) in complex external environment seriously affects the normal operation of the SMPS, which can be suppressed by adding a metal shell outside the SMPS. However, in order to meet the requirement of the heat dissipation, holes are opened in the metal shell, and the external radiated EMI enters into the shell through the holes, reducing the shielding effectiveness (SE) of the shell. In this paper, a new method to optimize the shielding effectiveness of the switched-mode power supply based on particle swarm optimization (PSO) algorithm is proposed. The influence of the metal shell opening mode on shielding effectiveness is studied, and the simulation results verify the effectiveness of the proposed method. In addition, the position arrangement of the hole array on the shell is studied, which further improves the shielding effectiveness of the SMPS.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115868862","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 : 2021-11-13DOI: 10.1109/peas53589.2021.9628802
Chengzi Yang, Haoyuan Jin, Huaqing Li, Longyang Yu, Y. Pei, Laili Wang
The extended-phase-shift (EPS) control is proposed to decrease the power circulating flow (PCF) in dual-active-bridge (DAB) DC-DC converters, further improve the efficiency. However, if the calculation of the outer phase shift angle D1 is not accurate due to the complex working conditions of DAB, there will still be a certain amount of power backflow or hard switching states, which will affect the efficiency of the converter. In this paper, a minimum PFC control method based on reverse conduction state detection for DAB converter with EPS control is proposed. According to the conduction state of the body diodes, D1 can be adjusted to the best value which ensured the minimum PCF and ZVS turn-on of the DAB converter. Experimental results show that the proposed method can effectively control the PCF at its minimum point, and all the switches are working under ZVS conditions, thereby the efficiency of the DAB converter is optimized.
{"title":"A Minimum Power Circulating Flow and Optimal Dead-time Control Method for GaN Based DAB Converter with EPS Control","authors":"Chengzi Yang, Haoyuan Jin, Huaqing Li, Longyang Yu, Y. Pei, Laili Wang","doi":"10.1109/peas53589.2021.9628802","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628802","url":null,"abstract":"The extended-phase-shift (EPS) control is proposed to decrease the power circulating flow (PCF) in dual-active-bridge (DAB) DC-DC converters, further improve the efficiency. However, if the calculation of the outer phase shift angle D1 is not accurate due to the complex working conditions of DAB, there will still be a certain amount of power backflow or hard switching states, which will affect the efficiency of the converter. In this paper, a minimum PFC control method based on reverse conduction state detection for DAB converter with EPS control is proposed. According to the conduction state of the body diodes, D1 can be adjusted to the best value which ensured the minimum PCF and ZVS turn-on of the DAB converter. Experimental results show that the proposed method can effectively control the PCF at its minimum point, and all the switches are working under ZVS conditions, thereby the efficiency of the DAB converter is optimized.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133670380","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 : 2021-11-13DOI: 10.1109/peas53589.2021.9628580
Xiaoyun Chen, Jun Luo, D. Lin
In this paper, Partial Element Equivalent Circuit method (PEEC) is used to model multi-dimensional Helmholtz coils. Spatial magnetic flux density of multi-dimensional Helmholtz coils are calculated; the visualization of the uniform intensity region is realized. The envelope diagrams of the uniform magnetic field with the normalized magnetic flux density difference less than 1% and 2% are drawn, and the magnetic field distribution of Helmholtz coils of different dimensions are compared and analyzed. The effect of different placement positions of the receiving coil on the magnetic flux density of the Helmholtz coil are studied. The results of PEEC calculation are compared with those obtained by ANSYS simulation tool and analytical calculation, which proves the feasibility of PEEC to calculate the magnetic flux density for induction coils.
{"title":"Analysis and Visualization of Magnetic Field for Multi-dimensional Helmholtz Coils Based on PEEC","authors":"Xiaoyun Chen, Jun Luo, D. Lin","doi":"10.1109/peas53589.2021.9628580","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628580","url":null,"abstract":"In this paper, Partial Element Equivalent Circuit method (PEEC) is used to model multi-dimensional Helmholtz coils. Spatial magnetic flux density of multi-dimensional Helmholtz coils are calculated; the visualization of the uniform intensity region is realized. The envelope diagrams of the uniform magnetic field with the normalized magnetic flux density difference less than 1% and 2% are drawn, and the magnetic field distribution of Helmholtz coils of different dimensions are compared and analyzed. The effect of different placement positions of the receiving coil on the magnetic flux density of the Helmholtz coil are studied. The results of PEEC calculation are compared with those obtained by ANSYS simulation tool and analytical calculation, which proves the feasibility of PEEC to calculate the magnetic flux density for induction coils.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117308676","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}
Inductive power transfer (IPT) technology is suitable for battery charging applications due to its advantages of safety, convenience and weather proof. A primary shunt inductor compensation topology (named as L-S/S) is proposed in this paper to achieve a target constant current (CC) and constant voltage (CV) battery charging profile with natural zero voltage switching (ZVS). The design and analysis of L-S/S compensation are based on the characteristics of the gyrator as it provides a simple way to analyze the resonant circuits. Load-independent CV outputs and CC outputs can be achieved at two different operating frequencies, respectively. Zero phase angle (ZPA) can be maintained at these two operating frequencies to eliminate the reactive power. Since the shunt inductor of the primary side naturally provides a turn-off current, ZVS can be achieved at the exact resonance point without other assisted methods such as slightly adjusting the resonant parameters. Experiments are carried out on a 1kW prototype to prove the proposed method. Experimental results show that ZVS is naturally realized in various charging states. The current fluctuation is less than 1% in CC mode, and the voltage fluctuation is less than 4% in CV mode. Steady outputs can be achieved by slightly modulating the operating frequency. The peak efficiency is 95.2% at rated power.
{"title":"A Primary Shunt Inductor Compensated Inductive Power Transfer System with Natural ZVS for Battery Charging Application","authors":"Shiying Luo, Zhuhaobo Zhang, Guanxi Li, Zirui Yao, Xin Zhang, Hao Ma","doi":"10.1109/peas53589.2021.9628517","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628517","url":null,"abstract":"Inductive power transfer (IPT) technology is suitable for battery charging applications due to its advantages of safety, convenience and weather proof. A primary shunt inductor compensation topology (named as L-S/S) is proposed in this paper to achieve a target constant current (CC) and constant voltage (CV) battery charging profile with natural zero voltage switching (ZVS). The design and analysis of L-S/S compensation are based on the characteristics of the gyrator as it provides a simple way to analyze the resonant circuits. Load-independent CV outputs and CC outputs can be achieved at two different operating frequencies, respectively. Zero phase angle (ZPA) can be maintained at these two operating frequencies to eliminate the reactive power. Since the shunt inductor of the primary side naturally provides a turn-off current, ZVS can be achieved at the exact resonance point without other assisted methods such as slightly adjusting the resonant parameters. Experiments are carried out on a 1kW prototype to prove the proposed method. Experimental results show that ZVS is naturally realized in various charging states. The current fluctuation is less than 1% in CC mode, and the voltage fluctuation is less than 4% in CV mode. Steady outputs can be achieved by slightly modulating the operating frequency. The peak efficiency is 95.2% at rated power.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115889316","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 : 2021-11-13DOI: 10.1109/peas53589.2021.9628433
Bingtao Zhang, Weimin Wu, Ning Gao, E. Koutroulis, H. Chung, F. Blaabjerg
In recent years, due to fast dynamic response, no modulator and multi-constraint control, the finite control set model predictive control (FCS-MPC) has been widely employed in power converters. However, the computational burden of traditional FCS-MPC is relatively heavy owing to traversing all possible voltage vectors. In this paper, a novel FCS-MPC algorithm is proposed for LCL-type grid-connected inverters. Firstly, the weighted average inductor current (WAIC) algorithm is utilized to lower the order of the LCL filter model. Then, based on the idea of deadbeat control, the expected inverter output voltage vector is calculated according to the grid-injected current reference. Depending on the desired voltage vector, the optimal voltage vector which minimizes the constructed cost function, is selected from its neighboring voltage vectors. Compared with the traditional FCS-MPC techniques, the proposed control algorithm can decrease the candidate voltage vectors from eight to three, which effectively reduces the computational complexity of the algorithm. A simulation model and experimental platform of a two-level three-phase grid-connected inverter are established to prove the performance of the proposed algorithm.
{"title":"Finite Control Set - Model Predictive Control Based on Deadbeat Control for LCL-Type Grid-connected Inverters","authors":"Bingtao Zhang, Weimin Wu, Ning Gao, E. Koutroulis, H. Chung, F. Blaabjerg","doi":"10.1109/peas53589.2021.9628433","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628433","url":null,"abstract":"In recent years, due to fast dynamic response, no modulator and multi-constraint control, the finite control set model predictive control (FCS-MPC) has been widely employed in power converters. However, the computational burden of traditional FCS-MPC is relatively heavy owing to traversing all possible voltage vectors. In this paper, a novel FCS-MPC algorithm is proposed for LCL-type grid-connected inverters. Firstly, the weighted average inductor current (WAIC) algorithm is utilized to lower the order of the LCL filter model. Then, based on the idea of deadbeat control, the expected inverter output voltage vector is calculated according to the grid-injected current reference. Depending on the desired voltage vector, the optimal voltage vector which minimizes the constructed cost function, is selected from its neighboring voltage vectors. Compared with the traditional FCS-MPC techniques, the proposed control algorithm can decrease the candidate voltage vectors from eight to three, which effectively reduces the computational complexity of the algorithm. A simulation model and experimental platform of a two-level three-phase grid-connected inverter are established to prove the performance of the proposed algorithm.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"537 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116164662","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 : 2021-11-13DOI: 10.1109/peas53589.2021.9628467
Xuanbo Wang, Wen Wang, Xiong Gao
Based on the two aspects of DC current prediction and critical extinction voltage-time area, the existing constant extinction angle control is improved. Assuming DC current Id changes at a constant rate, and the rate of DC current change corresponding to the beginning of commutation is taken as the rate of DC current change during the entire commutation period, that is, dId/dt. At the same time, considering the influence of the commutation voltage change on the extinction angle γ in the transient process, the concept of the critical extinction voltage time area is introduced, and the condition that the extinction voltage time area should meet the critical extinction area during transient operation is derived. The γ control reference value γref expression is adjusted, and the trigger angle α value is obtained by combining the DC current prediction. In this way, when the system is operating in a transient process, the trigger angle α can be adaptively adjusted by comprehensively considering the change of Id and the change of the commutation voltage. The simulation shows that the improved control strategy effectively reduces the probability of commutation failure and improves the stability of the AC bus voltage.
{"title":"Predictive Constant Extinction Angle Control of LCC-HVDC Receiving End Converter","authors":"Xuanbo Wang, Wen Wang, Xiong Gao","doi":"10.1109/peas53589.2021.9628467","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628467","url":null,"abstract":"Based on the two aspects of DC current prediction and critical extinction voltage-time area, the existing constant extinction angle control is improved. Assuming DC current Id changes at a constant rate, and the rate of DC current change corresponding to the beginning of commutation is taken as the rate of DC current change during the entire commutation period, that is, dId/dt. At the same time, considering the influence of the commutation voltage change on the extinction angle γ in the transient process, the concept of the critical extinction voltage time area is introduced, and the condition that the extinction voltage time area should meet the critical extinction area during transient operation is derived. The γ control reference value γref expression is adjusted, and the trigger angle α value is obtained by combining the DC current prediction. In this way, when the system is operating in a transient process, the trigger angle α can be adaptively adjusted by comprehensively considering the change of Id and the change of the commutation voltage. The simulation shows that the improved control strategy effectively reduces the probability of commutation failure and improves the stability of the AC bus voltage.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116308430","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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