Three-phase NPC-type grid-connected inverter has been widely used in the renewable energy generation systems with the advantages of high efficiency, high power and low cost. Finite control set model predictive control (FCS-MPC) has strong robustness and fast dynamic response, so it is widely used in the control system of grid-connected inverter. However, the traditional FCS-MPC bears with irregular switching state, which will reduce the current tracking accuracy, accidentally produce high current ripple and electromagnetic noise. Aiming at the above shortcomings, an efficient and fixed operation frequency model predictive based on the discrete space vector modulation (MPC-DSVM) is presented in this paper. Firstly, the mathematical model and voltage vector of NPC-type converter are given according to the principle of deadbeat control. By applying the virtual vectors which are linear synthetized with the real vectors, the MPC-DSVM method can output more voltage vectors with fixed switching frequency. The results obtained show that the current tracking accuracy is improved, the current distortion and imbalance of neutral point potential are reduced.
{"title":"Discrete Space Vector Modulation-based Scheme of Model Predictive Power Control for NPC Converter","authors":"Chaoliang Dang, Fei Wang, Xiangqian Tong, Ding-I Liu, Xiaoyu Mu, Weizhang Song","doi":"10.1109/peas53589.2021.9628710","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628710","url":null,"abstract":"Three-phase NPC-type grid-connected inverter has been widely used in the renewable energy generation systems with the advantages of high efficiency, high power and low cost. Finite control set model predictive control (FCS-MPC) has strong robustness and fast dynamic response, so it is widely used in the control system of grid-connected inverter. However, the traditional FCS-MPC bears with irregular switching state, which will reduce the current tracking accuracy, accidentally produce high current ripple and electromagnetic noise. Aiming at the above shortcomings, an efficient and fixed operation frequency model predictive based on the discrete space vector modulation (MPC-DSVM) is presented in this paper. Firstly, the mathematical model and voltage vector of NPC-type converter are given according to the principle of deadbeat control. By applying the virtual vectors which are linear synthetized with the real vectors, the MPC-DSVM method can output more voltage vectors with fixed switching frequency. The results obtained show that the current tracking accuracy is improved, the current distortion and imbalance of neutral point potential are reduced.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"51 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":"128808908","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}
In hybrid power source system (HPSS) of more electric aircraft (MEA), energy management strategy (EMS) distributes power of each power sources and single-objective optimization or multi-objective optimization can be realized. A double-layered (DOL) energy management strategy which is composed of fuzzy control layer for lithium battery and variable power reference filter layer for fuel cell system is proposed in this paper. The first layer is the fuzzy control layer which adds the extra input power reference of fuel cell, and it is related to efficiency of fuel cell system and state of charge of lithium battery. Second layer possesses a variable parameter which can keep the power reference of fuel cell close to the highest efficiency point and it has a good effect on the health and efficiency of fuel cell. By combining two layers, both SOC of lithium battery and efficiency of fuel cell system are regarded as the optimization objectives. For verifying proposed EMS, it is compared with finite state machine (FSM) energy management strategy and the simulation results shows that proposed EMS outdoes FSM EMS. In 50% initial SOC condition, average efficiency of fuel cell system and equivalent hydrogen consumption of the proposed EMS are 2.13% higher and 1.7g lower than FSM respectively, and they are 1.84% higher and 1.5g lower than FSM in 80% initial SOC condition. In addition, the proposed EMS is a real-time approach without demand of much calculation resource.
{"title":"A Double-layered Energy Management Strategy for Fuel Cell Hybrid Power Source System of More Electric Aircraft","authors":"Wenzhuo Shi, Y. Huangfu, Yuhui Ma, Liangcai Xu, Zelong Zhang, Tianyi Yu","doi":"10.1109/peas53589.2021.9628686","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628686","url":null,"abstract":"In hybrid power source system (HPSS) of more electric aircraft (MEA), energy management strategy (EMS) distributes power of each power sources and single-objective optimization or multi-objective optimization can be realized. A double-layered (DOL) energy management strategy which is composed of fuzzy control layer for lithium battery and variable power reference filter layer for fuel cell system is proposed in this paper. The first layer is the fuzzy control layer which adds the extra input power reference of fuel cell, and it is related to efficiency of fuel cell system and state of charge of lithium battery. Second layer possesses a variable parameter which can keep the power reference of fuel cell close to the highest efficiency point and it has a good effect on the health and efficiency of fuel cell. By combining two layers, both SOC of lithium battery and efficiency of fuel cell system are regarded as the optimization objectives. For verifying proposed EMS, it is compared with finite state machine (FSM) energy management strategy and the simulation results shows that proposed EMS outdoes FSM EMS. In 50% initial SOC condition, average efficiency of fuel cell system and equivalent hydrogen consumption of the proposed EMS are 2.13% higher and 1.7g lower than FSM respectively, and they are 1.84% higher and 1.5g lower than FSM in 80% initial SOC condition. In addition, the proposed EMS is a real-time approach without demand of much calculation resource.","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":"125564823","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/peas53589.2021.9628622
Heshou Wang, K. W. Eric Cheng
Inductive power transfer (IPT) offers a convenient and flexible charging way. Such superiority can be further enlarged by inserting intermediate coils and ferrite cores. In this paper, an IPT system with a reconfigurable intermediate circuit and ferrite cores is proposed. Two working modes, i.e., load-independent constant voltage (CV) and load-independent constant current (CC), can be realized. Zero voltage switching (ZVS) can also be achieved. By designing the entire system delicately, the magnetic coupler can significantly enhance the main magnetic couplings and reduce the unwanted cross-coupling phenomenon simultaneously. The fundamental analysis, coupler design, compensation topologies, and experimental validation results are all discussed in this article.
{"title":"An Intermediate-Coil and Ferrite-Based Coupling Structure With Load-Independent Constant Outputs for Inductive Power Transfer","authors":"Heshou Wang, K. W. Eric Cheng","doi":"10.1109/peas53589.2021.9628622","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628622","url":null,"abstract":"Inductive power transfer (IPT) offers a convenient and flexible charging way. Such superiority can be further enlarged by inserting intermediate coils and ferrite cores. In this paper, an IPT system with a reconfigurable intermediate circuit and ferrite cores is proposed. Two working modes, i.e., load-independent constant voltage (CV) and load-independent constant current (CC), can be realized. Zero voltage switching (ZVS) can also be achieved. By designing the entire system delicately, the magnetic coupler can significantly enhance the main magnetic couplings and reduce the unwanted cross-coupling phenomenon simultaneously. The fundamental analysis, coupler design, compensation topologies, and experimental validation results are all discussed in this article.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"49 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":"121469666","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/peas53589.2021.9628849
Hanyu Liu, K. Sun, Guoen Cao, Zheyuan Yi, Shilei Lu
As the core component of the isolated DC-DC converter, high-frequency transformers isolate different voltage levels, significantly determines the reliability and safety of the DC-DC converter. Among high-frequency transformer, planar high-frequency transformer shows good repeatability and modularity. PCB, commonly used as the winding of planar transformers, has the potential of using in high insulation application with the electrical strength of 35kV. However, planar transformer is rarely used in high voltage occasions. Therefore, this paper explores the possibility of using planar transformers in high isolation voltage standards(>10kV). The major concerns during the insulation design process are fully included. The design process of high voltage resistance planar transformers is also introduced. A specific prototype design is analyzed to verify the design and optimization methods. The power density of the transformer reaches up to a high level (14kW/L) and the insulation withstand voltage fulfills the high voltage requirement (>10kV).
{"title":"Design and Optimization of High Insulation Voltage Planar Transformer for DC-DC Converters","authors":"Hanyu Liu, K. Sun, Guoen Cao, Zheyuan Yi, Shilei Lu","doi":"10.1109/peas53589.2021.9628849","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628849","url":null,"abstract":"As the core component of the isolated DC-DC converter, high-frequency transformers isolate different voltage levels, significantly determines the reliability and safety of the DC-DC converter. Among high-frequency transformer, planar high-frequency transformer shows good repeatability and modularity. PCB, commonly used as the winding of planar transformers, has the potential of using in high insulation application with the electrical strength of 35kV. However, planar transformer is rarely used in high voltage occasions. Therefore, this paper explores the possibility of using planar transformers in high isolation voltage standards(>10kV). The major concerns during the insulation design process are fully included. The design process of high voltage resistance planar transformers is also introduced. A specific prototype design is analyzed to verify the design and optimization methods. The power density of the transformer reaches up to a high level (14kW/L) and the insulation withstand voltage fulfills the high voltage requirement (>10kV).","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"34 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":"125730382","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/peas53589.2021.9628629
Guanlong Jia, Mingshuo Li, X. Su, Song Tang, Xiaoming Liu, Wentao Jiang
The circulating current of modular multilevel converter (MMC) is an inherent phenomenon. The existing circulating current analysis methods have mainly considered the power losses and the submodule (SM) capacitor voltage. Under low-frequency operation, MMC SM has a larger capacitor voltage ripple, and this paper proposes a novel circulating current injection method to reduce the SM capacitor voltage ripple. The method is based on injecting a circulating current, which is easily derived by the instantaneous information of MMC, within the phase to attenuate the lower frequency arm powers. And, it omits using an extensive lookup table and injecting a common-mode voltage, thus simplifies the control and avoids causing over-modulation. In addition, a mathematical analysis model is built and it reveals the impact on the SM capacitor voltage ripple. The effectiveness of the introduced circulating current injection method is demonstrated by the experimental results.
{"title":"Circulating Current Injection Method for the Modular Multilevel Converter","authors":"Guanlong Jia, Mingshuo Li, X. Su, Song Tang, Xiaoming Liu, Wentao Jiang","doi":"10.1109/peas53589.2021.9628629","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628629","url":null,"abstract":"The circulating current of modular multilevel converter (MMC) is an inherent phenomenon. The existing circulating current analysis methods have mainly considered the power losses and the submodule (SM) capacitor voltage. Under low-frequency operation, MMC SM has a larger capacitor voltage ripple, and this paper proposes a novel circulating current injection method to reduce the SM capacitor voltage ripple. The method is based on injecting a circulating current, which is easily derived by the instantaneous information of MMC, within the phase to attenuate the lower frequency arm powers. And, it omits using an extensive lookup table and injecting a common-mode voltage, thus simplifies the control and avoids causing over-modulation. In addition, a mathematical analysis model is built and it reveals the impact on the SM capacitor voltage ripple. The effectiveness of the introduced circulating current injection method is demonstrated by the experimental results.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"19 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114122810","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/peas53589.2021.9628568
Yifan Jiang, Heyuan Li, Minfan Fu
This paper proposes a DC/DC converter using differential load-independent Class E inverter. It explores the design methodology of the differential load-independent Class E inverter. With proper parameter design, the load-sensitivity issue of the traditional Class E inverters is addressed, and high efficiency conversion could be maintained for a wide load range. In order to validate the design method, an isolated inductive power transfer system is built with a full-bridge rectifier at the secondary side. Both the simulation and experiment are given to verify the system characteristics. Constant output and high-efficiency operation are achieved under a wide load range.
{"title":"High-Frequency DC/DC Converter Based on Differential Load-Independent Class E Inverter","authors":"Yifan Jiang, Heyuan Li, Minfan Fu","doi":"10.1109/peas53589.2021.9628568","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628568","url":null,"abstract":"This paper proposes a DC/DC converter using differential load-independent Class E inverter. It explores the design methodology of the differential load-independent Class E inverter. With proper parameter design, the load-sensitivity issue of the traditional Class E inverters is addressed, and high efficiency conversion could be maintained for a wide load range. In order to validate the design method, an isolated inductive power transfer system is built with a full-bridge rectifier at the secondary side. Both the simulation and experiment are given to verify the system characteristics. Constant output and high-efficiency operation are achieved under a wide load range.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"18 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114128092","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/peas53589.2021.9628738
Shengwei Gao, Hao Wang, Yi-feng Wang, Zhongjie Wang, Bo Chen
The critical conduction mode (CRM) of boost topology can realize the zero-voltage switch of the power MOSFET. Maintaining the negative inductor current within a certain range through variable frequency control, which can make the converter have high efficiency in a large load range. The application of gallium nitride (GaN) devices can further increase the switching frequency of the converter, which is very critical in the application of CRM mode. Parallel converters must solve the problem of uneven current distribution. This paper proposes a new digital current sharing control strategy without adding auxiliary circuits. On the one hand, this control strategy achieves accurate current sharing among different modules through reasonable current sharing control. On the other hand, it uses formula calculations to change the switching frequency in real time to maintain the CRM mode to improve efficiency. Finally, a two-channel parallel boost experimental prototype was built based on the modular idea to verify the feasibility and superiority of the proposed control strategy.
{"title":"Current sharing control strategy in CRM mode for multi-module parallel Boost converter","authors":"Shengwei Gao, Hao Wang, Yi-feng Wang, Zhongjie Wang, Bo Chen","doi":"10.1109/peas53589.2021.9628738","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628738","url":null,"abstract":"The critical conduction mode (CRM) of boost topology can realize the zero-voltage switch of the power MOSFET. Maintaining the negative inductor current within a certain range through variable frequency control, which can make the converter have high efficiency in a large load range. The application of gallium nitride (GaN) devices can further increase the switching frequency of the converter, which is very critical in the application of CRM mode. Parallel converters must solve the problem of uneven current distribution. This paper proposes a new digital current sharing control strategy without adding auxiliary circuits. On the one hand, this control strategy achieves accurate current sharing among different modules through reasonable current sharing control. On the other hand, it uses formula calculations to change the switching frequency in real time to maintain the CRM mode to improve efficiency. Finally, a two-channel parallel boost experimental prototype was built based on the modular idea to verify the feasibility and superiority of the proposed control strategy.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"80 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":"116778984","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/peas53589.2021.9628765
Xuan Zhao, Dong Jiang, Jialou Gao, Wei Sun
Neutral Point Clamped (NPC) three-level inverter has been applied in industry as a mature technology, but suffering from the neutral point voltage (NPV) fluctuation problem especially for medium voltage vector charging. This paper deals with the common-mode voltage (CMV) issue of a hybrid inverter, which consists of a classic NPC inverter connected to a flying capacitor (FC) leg. The FC leg has the capability to actively balance the NPV in each switching cycle, and the NPC inverter can maintain NP voltage balance without sacrificing degrees of freedom. This paper introduces the modulation-based method of CMV elimination applied to the hybrid inverter, which can immensely reduce the CMV and leakage current. Simulation and experimental results are provided to validate that the hybrid inverter has better ability of NPV balance than the regular NPC inverter and the FC-leg can obtain much smaller NPV ripple. CMV attenuation can be achieved by applying common-mode elimination PWM in hybrid inverter.
{"title":"Common-mode Voltage Suppression for Hybrid 4-leg Three-level FC-NPC Inverter","authors":"Xuan Zhao, Dong Jiang, Jialou Gao, Wei Sun","doi":"10.1109/peas53589.2021.9628765","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628765","url":null,"abstract":"Neutral Point Clamped (NPC) three-level inverter has been applied in industry as a mature technology, but suffering from the neutral point voltage (NPV) fluctuation problem especially for medium voltage vector charging. This paper deals with the common-mode voltage (CMV) issue of a hybrid inverter, which consists of a classic NPC inverter connected to a flying capacitor (FC) leg. The FC leg has the capability to actively balance the NPV in each switching cycle, and the NPC inverter can maintain NP voltage balance without sacrificing degrees of freedom. This paper introduces the modulation-based method of CMV elimination applied to the hybrid inverter, which can immensely reduce the CMV and leakage current. Simulation and experimental results are provided to validate that the hybrid inverter has better ability of NPV balance than the regular NPC inverter and the FC-leg can obtain much smaller NPV ripple. CMV attenuation can be achieved by applying common-mode elimination PWM in hybrid inverter.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"47 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":"125251928","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/peas53589.2021.9628605
Zhiqiang Bo, Weijian Han
This paper proposes a three-port bidirectional dc-dc converter with an interleaved parallel boost port for electric vehicle’s power distribution network. The boost port benefits low current ripple, voltage matching for ZVS and low transformer turns ratio. With all control degrees of freedom involved and considering the energy stored in MOSFET’s parasitic capacitance, inductor currents, transmission power and ZVS boundaries are mathematically and accurately expressed through frequency-domain analysis, which can be directly used for further system optimization. The proposed model are verified via computer simulation results.
{"title":"Steady-state Analysis of a Three-port Bidirectional DC-DC Converter for Electric Vehicles","authors":"Zhiqiang Bo, Weijian Han","doi":"10.1109/peas53589.2021.9628605","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628605","url":null,"abstract":"This paper proposes a three-port bidirectional dc-dc converter with an interleaved parallel boost port for electric vehicle’s power distribution network. The boost port benefits low current ripple, voltage matching for ZVS and low transformer turns ratio. With all control degrees of freedom involved and considering the energy stored in MOSFET’s parasitic capacitance, inductor currents, transmission power and ZVS boundaries are mathematically and accurately expressed through frequency-domain analysis, which can be directly used for further system optimization. The proposed model are verified via computer simulation results.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"14 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":"131537231","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/peas53589.2021.9628687
Manxin Chen, Changqing Yin, Chaoxu Gao, P. Loh
Multilevel inverters (MLIs) for renewable energy applications usually require a certain form of voltage boosting. To achieve an embedded voltage-boost capability, this paper proposes a novel seven-level inverter based on the H-bridge (HB) inverter, whose two half-bridge legs are cascaded with a three-level T-type (3LTT) inverter, respectively. The proposed inverter is supplied by a single dc source in series with an inductor. The inductor is charged by the dc source when shooting through the HB switches. Voltage boosting is therefore embedded into the proposed inverter without extra switches. Auxiliary circuits for balancing the voltages of capacitors are not required either, since each capacitor can be charged by the inductive dc-link with the same step-up average voltage. The carrier-based phase-shift pulse-width modulation (PWM) scheme is applied to the HB inverter to produce two inductive-charge states within a switching period. The operating frequency of the inductor is thus doubled, reducing the high-frequency input current ripple. Operating principles and theoretical analysis of the proposed inverter are given. Simulation and experimental results agree well with each other, verifying the feasibility of the proposed inverter in achieving a boosted seven-level output voltage.
{"title":"Cascaded H-Bridge and T-Type Seven-Level Inverter Fed by the Inductive DC-Link with Embedded Voltage Boosting","authors":"Manxin Chen, Changqing Yin, Chaoxu Gao, P. Loh","doi":"10.1109/peas53589.2021.9628687","DOIUrl":"https://doi.org/10.1109/peas53589.2021.9628687","url":null,"abstract":"Multilevel inverters (MLIs) for renewable energy applications usually require a certain form of voltage boosting. To achieve an embedded voltage-boost capability, this paper proposes a novel seven-level inverter based on the H-bridge (HB) inverter, whose two half-bridge legs are cascaded with a three-level T-type (3LTT) inverter, respectively. The proposed inverter is supplied by a single dc source in series with an inductor. The inductor is charged by the dc source when shooting through the HB switches. Voltage boosting is therefore embedded into the proposed inverter without extra switches. Auxiliary circuits for balancing the voltages of capacitors are not required either, since each capacitor can be charged by the inductive dc-link with the same step-up average voltage. The carrier-based phase-shift pulse-width modulation (PWM) scheme is applied to the HB inverter to produce two inductive-charge states within a switching period. The operating frequency of the inductor is thus doubled, reducing the high-frequency input current ripple. Operating principles and theoretical analysis of the proposed inverter are given. Simulation and experimental results agree well with each other, verifying the feasibility of the proposed inverter in achieving a boosted seven-level output voltage.","PeriodicalId":268264,"journal":{"name":"2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)","volume":"10 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":"132613132","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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