Pub Date : 2018-04-18DOI: 10.1109/APEC.2018.8341098
Wei-Chia Wu, T. Liang, Kai-Hui Chen, Cheng-Yuan Li
In quasi-resonant (QR) controller, sensing the current of the power switch and using a delay time are commonly used to achieve valley-voltage-switching. However, the accuracy of valley-voltage switching instant in both methods are affected by the components variations during manufacturing. A primary-side QR-control IC for flyback converter with a novel valley detector is proposed to solve this problem. By sensing the auxiliary winding voltage, the controller estimates the quarter of the resonant period. And the time which the voltage across the power switch decreasing to valley is estimated accurately. Additionally, the primary-side control is adopted to reduce the size and cost of circuit. Finally, this controller is fabricated with TSMC 0.25 μm CMOS high voltage mixed-signal general purpose process, and applied to an input voltage of 90–264 Vrms, output voltage of 12 V, and output power of 30 W flyback converter to verify the feasibility of proposed control.
{"title":"Quasi-resonant flyback converter with new valley voltage detection mechanism","authors":"Wei-Chia Wu, T. Liang, Kai-Hui Chen, Cheng-Yuan Li","doi":"10.1109/APEC.2018.8341098","DOIUrl":"https://doi.org/10.1109/APEC.2018.8341098","url":null,"abstract":"In quasi-resonant (QR) controller, sensing the current of the power switch and using a delay time are commonly used to achieve valley-voltage-switching. However, the accuracy of valley-voltage switching instant in both methods are affected by the components variations during manufacturing. A primary-side QR-control IC for flyback converter with a novel valley detector is proposed to solve this problem. By sensing the auxiliary winding voltage, the controller estimates the quarter of the resonant period. And the time which the voltage across the power switch decreasing to valley is estimated accurately. Additionally, the primary-side control is adopted to reduce the size and cost of circuit. Finally, this controller is fabricated with TSMC 0.25 μm CMOS high voltage mixed-signal general purpose process, and applied to an input voltage of 90–264 Vrms, output voltage of 12 V, and output power of 30 W flyback converter to verify the feasibility of proposed control.","PeriodicalId":113756,"journal":{"name":"2018 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122802684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-18DOI: 10.1109/APEC.2018.8341322
Jinia Roy, R. Ayyanar
This paper proposes a modified duty phase shift technique for an M-phase extended-duty-ratio (EDR) boost converter to facilitate the inherent current sharing property and reduced voltage stress on the switching devices of the EDR converter over wider operating region. With conventional phase shift of (360/M)° among the operating phases, a reduced voltage stress and inherent current share between the interleaved boost phases is only possible for the operating region of duty ratio given by (M − 1)/M ≤ D ≤ 1, with a minimum gain of M2. However, for a wide range of input-output application with the need of extended range of voltage conversion gain, the converter will operate over broader duty ratio range. With the proposed duty phase shift technique, the advantages of EDR converter of inherent current sharing and reduced voltage stress on the active devices can be restored over wider operating range allowing a minimum gain of 2 M. The method is validated with extensive simulation results from multi-phase EDR boost and experimental results from a 250 W 3-phase EDR boost with GaN-based hardware prototype operating at 200 kHz switching frequency.
{"title":"Duty phase shift technique for extended-duty-ratio boost converter for reducing device voltage stress over wider operating range","authors":"Jinia Roy, R. Ayyanar","doi":"10.1109/APEC.2018.8341322","DOIUrl":"https://doi.org/10.1109/APEC.2018.8341322","url":null,"abstract":"This paper proposes a modified duty phase shift technique for an M-phase extended-duty-ratio (EDR) boost converter to facilitate the inherent current sharing property and reduced voltage stress on the switching devices of the EDR converter over wider operating region. With conventional phase shift of (360/M)° among the operating phases, a reduced voltage stress and inherent current share between the interleaved boost phases is only possible for the operating region of duty ratio given by (M − 1)/M ≤ D ≤ 1, with a minimum gain of M2. However, for a wide range of input-output application with the need of extended range of voltage conversion gain, the converter will operate over broader duty ratio range. With the proposed duty phase shift technique, the advantages of EDR converter of inherent current sharing and reduced voltage stress on the active devices can be restored over wider operating range allowing a minimum gain of 2 M. The method is validated with extensive simulation results from multi-phase EDR boost and experimental results from a 250 W 3-phase EDR boost with GaN-based hardware prototype operating at 200 kHz switching frequency.","PeriodicalId":113756,"journal":{"name":"2018 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114807061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-18DOI: 10.1109/APEC.2018.8341568
Jinia Roy, Yinglai Xia, R. Ayyanar
Double line frequency power decoupling with reduced capacitance and mitigation of leakage current are two of the major challenges of any grid-connected single phase photovoltaic (PV) inverter. This paper compares the performances of different topologies for single phase transformerless PV application in terms of the power decoupling capacitor requirement, the current ripple and total harmonic distortion (THD), efficiency performance, and leakage current. The topologies considered include a doubly grounded T-type dynamic dc-link (DDCL) inverter, a half-bridge voltage swing (HBVS) inverter, and conventional full-bridge (FB) inverter with three different modulation schemes (bipolar, hybrid, and unipolar). The leakage current arising from both parasitic capacitances of the PV module and the heat sink is considered in the present study which is essential for design of the electromagnetic interference (EMI) filters. The analysis are supported by experimental results from SiC-based 1 kW hardware prototypes operating at 120 V ac nominal output at a switching frequency of 100 kHz for each of the topology.
减小电容的双线频功率解耦和减小漏电流是所有并网单相光伏逆变器面临的两大挑战。本文从功率去耦电容要求、电流纹波和总谐波失真(THD)、效率性能和漏电流等方面比较了不同拓扑结构在无单相变压器光伏应用中的性能。所考虑的拓扑包括双接地t型动态直流链路(DDCL)逆变器、半桥电压摆幅(HBVS)逆变器和具有三种不同调制方案(双极、混合和单极)的传统全桥(FB)逆变器。本文考虑了光伏组件和散热片寄生电容产生的漏电流，这对电磁干扰滤波器的设计至关重要。该分析得到了基于sic的1 kW硬件原型的实验结果的支持，这些原型在120 V ac标称输出下工作，每种拓扑结构的开关频率为100 kHz。
{"title":"Performance evaluation of single-phase transfomer-less PV inverter topologies","authors":"Jinia Roy, Yinglai Xia, R. Ayyanar","doi":"10.1109/APEC.2018.8341568","DOIUrl":"https://doi.org/10.1109/APEC.2018.8341568","url":null,"abstract":"Double line frequency power decoupling with reduced capacitance and mitigation of leakage current are two of the major challenges of any grid-connected single phase photovoltaic (PV) inverter. This paper compares the performances of different topologies for single phase transformerless PV application in terms of the power decoupling capacitor requirement, the current ripple and total harmonic distortion (THD), efficiency performance, and leakage current. The topologies considered include a doubly grounded T-type dynamic dc-link (DDCL) inverter, a half-bridge voltage swing (HBVS) inverter, and conventional full-bridge (FB) inverter with three different modulation schemes (bipolar, hybrid, and unipolar). The leakage current arising from both parasitic capacitances of the PV module and the heat sink is considered in the present study which is essential for design of the electromagnetic interference (EMI) filters. The analysis are supported by experimental results from SiC-based 1 kW hardware prototypes operating at 120 V ac nominal output at a switching frequency of 100 kHz for each of the topology.","PeriodicalId":113756,"journal":{"name":"2018 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125012096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-18DOI: 10.1109/APEC.2018.8341580
Zheming Jin, Josep M. Guerreros
For DC microgrids, the “plug and play” capability is one of the most desired functionalities to formulate a fully flexible and scalable system. The “plug and play” operation will put twofold requirements on the control of power sources: on the one hand, they shall share the load properly; on the other hand, the system stability shall be ensured. In this paper, a two degree-of-freedom admittance-type droop control method is proposed to fulfill the requirements of the “plug and play” operation. In the proposed method, both conventional proportional power sharing function and virtual inertia injection capability are included to provide an integrated decentralized solution to ensure proper power sharing and system stability, and therefore being helpful to achieve “plug and play” DC microgrid.
{"title":"Two-degree-of-freedom admittance-type droop control for plug-and-play DC microgrid","authors":"Zheming Jin, Josep M. Guerreros","doi":"10.1109/APEC.2018.8341580","DOIUrl":"https://doi.org/10.1109/APEC.2018.8341580","url":null,"abstract":"For DC microgrids, the “plug and play” capability is one of the most desired functionalities to formulate a fully flexible and scalable system. The “plug and play” operation will put twofold requirements on the control of power sources: on the one hand, they shall share the load properly; on the other hand, the system stability shall be ensured. In this paper, a two degree-of-freedom admittance-type droop control method is proposed to fulfill the requirements of the “plug and play” operation. In the proposed method, both conventional proportional power sharing function and virtual inertia injection capability are included to provide an integrated decentralized solution to ensure proper power sharing and system stability, and therefore being helpful to achieve “plug and play” DC microgrid.","PeriodicalId":113756,"journal":{"name":"2018 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133491987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-18DOI: 10.1109/APEC.2018.8341541
Shunlong Xiao, Xiao Li, Haiyu Zhang, R. Balog
Single phase inverter and rectifier systems have double line frequency ripple power which is inherent to the ac-side of the circuit but adversely affects the dc-side performance. Typically, an aluminum electrolytic capacitors is placed at the dc side to absorb this power ripple, but reduces the power density and reliability of the converter. Therefore, active decoupling methods have been proposed in the literature to transfer the ripple power to smaller storage components by extra switches to the converter. However, the existing active power circuits are mostly composed of half bridge circuit, which has inherent shoot-through potential problem and could degrade the system reliability. Moreover, the existing active power decoupling methods are normally implemented through predetermined voltage of storage component using conventional PI control method, which limits the decoupling dynamic performance of the system. In this paper, a novel active power decoupling method based on dual buck circuit and model predictive control is proposed. The dual buck circuit is composed of two separate buck converters operating in each half cycle and two split small dc-link capacitors to eliminate the dc-link voltage ripple. The topology is free of shoot-through and deadtime concern and the control is independent with that of the main power stage circuit, which makes the design simpler and more reliable. By applying model predictive control, the proposed control strategy is proved to have good dynamic performance by both simulation and experimental results.
{"title":"Active power decoupling method based on dual buck circuit with model predictive control","authors":"Shunlong Xiao, Xiao Li, Haiyu Zhang, R. Balog","doi":"10.1109/APEC.2018.8341541","DOIUrl":"https://doi.org/10.1109/APEC.2018.8341541","url":null,"abstract":"Single phase inverter and rectifier systems have double line frequency ripple power which is inherent to the ac-side of the circuit but adversely affects the dc-side performance. Typically, an aluminum electrolytic capacitors is placed at the dc side to absorb this power ripple, but reduces the power density and reliability of the converter. Therefore, active decoupling methods have been proposed in the literature to transfer the ripple power to smaller storage components by extra switches to the converter. However, the existing active power circuits are mostly composed of half bridge circuit, which has inherent shoot-through potential problem and could degrade the system reliability. Moreover, the existing active power decoupling methods are normally implemented through predetermined voltage of storage component using conventional PI control method, which limits the decoupling dynamic performance of the system. In this paper, a novel active power decoupling method based on dual buck circuit and model predictive control is proposed. The dual buck circuit is composed of two separate buck converters operating in each half cycle and two split small dc-link capacitors to eliminate the dc-link voltage ripple. The topology is free of shoot-through and deadtime concern and the control is independent with that of the main power stage circuit, which makes the design simpler and more reliable. By applying model predictive control, the proposed control strategy is proved to have good dynamic performance by both simulation and experimental results.","PeriodicalId":113756,"journal":{"name":"2018 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130886161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-18DOI: 10.1109/APEC.2018.8341579
Shunlong Xiao, R. Balog
Direct-current (dc) microgrids (MG), consisting of distributed renewable energy units and energy storage units, is expected to be the key enabling of future smart grid. The intermittent nature of renewable-energy units, coupled with the unpredictable changes in the load, requires the energy storage units compensate the fluctuating generated power and to regulate the dc-bus voltage. However, the energy storage units may not be always available, each energy unit converter should be able to switch between two different modes: current course converter to generate/consume power or voltage source converter to regulate the bus voltage. To address these two main challenges, a novel autonomous algorithm consisting of two layers of control is proposed, achieving good system dynamic, seamless transfer and decoupling performances. The primary layer control for each energy unit is based on model predictive current control, realizing free controller design and decoupled play & plug feature. Therefore, these energy units can be easily connected to the dc bus without affecting the operation of other converters. The secondary layer control based on a proposed distributed droop control determines the operation modes for each converter, either to be current source converter (CSC) or voltage source converter (VSC). The feasibility and effectiveness of the proposed control algorithm was verified under various case studies on dSPACE 1007 real-time simulation platform.
{"title":"An improved hierarchy and autonomous control for DC microgrid based on both model predictive and distributed droop control","authors":"Shunlong Xiao, R. Balog","doi":"10.1109/APEC.2018.8341579","DOIUrl":"https://doi.org/10.1109/APEC.2018.8341579","url":null,"abstract":"Direct-current (dc) microgrids (MG), consisting of distributed renewable energy units and energy storage units, is expected to be the key enabling of future smart grid. The intermittent nature of renewable-energy units, coupled with the unpredictable changes in the load, requires the energy storage units compensate the fluctuating generated power and to regulate the dc-bus voltage. However, the energy storage units may not be always available, each energy unit converter should be able to switch between two different modes: current course converter to generate/consume power or voltage source converter to regulate the bus voltage. To address these two main challenges, a novel autonomous algorithm consisting of two layers of control is proposed, achieving good system dynamic, seamless transfer and decoupling performances. The primary layer control for each energy unit is based on model predictive current control, realizing free controller design and decoupled play & plug feature. Therefore, these energy units can be easily connected to the dc bus without affecting the operation of other converters. The secondary layer control based on a proposed distributed droop control determines the operation modes for each converter, either to be current source converter (CSC) or voltage source converter (VSC). The feasibility and effectiveness of the proposed control algorithm was verified under various case studies on dSPACE 1007 real-time simulation platform.","PeriodicalId":113756,"journal":{"name":"2018 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122188622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-18DOI: 10.1109/APEC.2018.8341237
M. Diab, G. Adam, B. Williams, A. Massoud, Shehab Ahmed
This paper proposes a hybrid converter for medium-voltage six-phase machine drive systems that mixes the operation of a traditional two-level voltage-source inverter and the modular multilevel converter (MMC) to enable operation over a wide frequency range. Topologically, the proposed converter consists of nine arms resembling two sets of three-phase MMCs with three common arms, yielding a nine-arm MMC with a 25% reduction in the number of employed arms compared to a traditional dual three-phase MMC. The multilevel property of a standard MMC is emulated in the proposed converter, however on a two-level basis, resulting in a stepped two-level output voltage waveform. The proposed converter has a reduced footprint with advantages of small voltage steps, modular structure, and ease of scalability. Further, it is able to drive high-power six-phase machines within low operating frequencies at the rated torque. The operating principle of the converter is elaborated, and its modulation scheme is discussed. The features of the proposed converter are verified through simulations and experimentally.
{"title":"Quasi two-level PWM operation of a nine-arm modular multilevel converter for six-phase medium-voltage motor drives","authors":"M. Diab, G. Adam, B. Williams, A. Massoud, Shehab Ahmed","doi":"10.1109/APEC.2018.8341237","DOIUrl":"https://doi.org/10.1109/APEC.2018.8341237","url":null,"abstract":"This paper proposes a hybrid converter for medium-voltage six-phase machine drive systems that mixes the operation of a traditional two-level voltage-source inverter and the modular multilevel converter (MMC) to enable operation over a wide frequency range. Topologically, the proposed converter consists of nine arms resembling two sets of three-phase MMCs with three common arms, yielding a nine-arm MMC with a 25% reduction in the number of employed arms compared to a traditional dual three-phase MMC. The multilevel property of a standard MMC is emulated in the proposed converter, however on a two-level basis, resulting in a stepped two-level output voltage waveform. The proposed converter has a reduced footprint with advantages of small voltage steps, modular structure, and ease of scalability. Further, it is able to drive high-power six-phase machines within low operating frequencies at the rated torque. The operating principle of the converter is elaborated, and its modulation scheme is discussed. The features of the proposed converter are verified through simulations and experimentally.","PeriodicalId":113756,"journal":{"name":"2018 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"325 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122633713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-18DOI: 10.1109/APEC.2018.8341230
Yunting Liu, F. Peng
Conventional single-phase H-bridge applications have second-order harmonic ripple power on the dc bus. However, in applications like a voltage source inverter (VSI) module of a Distributed Static Series Compensator (DSSC), a larger dc bus voltage fluctuation is acceptable since the dc bus connects to no load. This paper releases the constraints on dc bus voltage ripples so that the dc-bus capacitor can be fully utilized. Based on this idea, a carrier magnitude varying modulation is proposed, in which the VSI can generate ten times the reactive power of a conventional SPWM based VSI. The system reactive power generating capability is assessed to compare with the conventional SPWM based VSI and the constant duty cycle control based VSI. A PI controller is applied to the system to regulate the ac current. The analysis and design are validated by simulation and experiments.
{"title":"A carrier magnitude varying modulation for distributed static series compensator to achieve a maximum reactive power generating capability","authors":"Yunting Liu, F. Peng","doi":"10.1109/APEC.2018.8341230","DOIUrl":"https://doi.org/10.1109/APEC.2018.8341230","url":null,"abstract":"Conventional single-phase H-bridge applications have second-order harmonic ripple power on the dc bus. However, in applications like a voltage source inverter (VSI) module of a Distributed Static Series Compensator (DSSC), a larger dc bus voltage fluctuation is acceptable since the dc bus connects to no load. This paper releases the constraints on dc bus voltage ripples so that the dc-bus capacitor can be fully utilized. Based on this idea, a carrier magnitude varying modulation is proposed, in which the VSI can generate ten times the reactive power of a conventional SPWM based VSI. The system reactive power generating capability is assessed to compare with the conventional SPWM based VSI and the constant duty cycle control based VSI. A PI controller is applied to the system to regulate the ac current. The analysis and design are validated by simulation and experiments.","PeriodicalId":113756,"journal":{"name":"2018 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116861190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-18DOI: 10.1109/APEC.2018.8341154
Yanfeng Shen, E. Liivik, F. Blaabjerg, D. Vinnikov, Huai Wang, A. Chub
The reliability of an impedance-source PV microconverter is evaluated based on the real-field mission profile. As part of a PV microinverter, the dc-dc microconverter is firstly described. Then the electro-thermal and lifetime models are built for the most reliability-critical components, i.e., the power semiconductor devices and capacitors. The finite element method (FEM) simulation is used for the thermal impedance extraction. The mission profile, i.e., the ambient temperature and solar irradiance, from Aalborg, Denmark is applied to the built electrothermal model. Finally, the thermal loading profiles and annual wear-out damage accumulation are obtained. In addition, experimental measurements from a 300-W converter prototype are given.
{"title":"Reliability evaluation of an impedance-source PV microconverter","authors":"Yanfeng Shen, E. Liivik, F. Blaabjerg, D. Vinnikov, Huai Wang, A. Chub","doi":"10.1109/APEC.2018.8341154","DOIUrl":"https://doi.org/10.1109/APEC.2018.8341154","url":null,"abstract":"The reliability of an impedance-source PV microconverter is evaluated based on the real-field mission profile. As part of a PV microinverter, the dc-dc microconverter is firstly described. Then the electro-thermal and lifetime models are built for the most reliability-critical components, i.e., the power semiconductor devices and capacitors. The finite element method (FEM) simulation is used for the thermal impedance extraction. The mission profile, i.e., the ambient temperature and solar irradiance, from Aalborg, Denmark is applied to the built electrothermal model. Finally, the thermal loading profiles and annual wear-out damage accumulation are obtained. In addition, experimental measurements from a 300-W converter prototype are given.","PeriodicalId":113756,"journal":{"name":"2018 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115045749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-18DOI: 10.1109/APEC.2018.8341600
Manuel Gutierrez, Peter A. Lindahl, A. Banerjee, S. Leeb
Power electronic circuits often regulate load power and present a constant power load (CPL) to the utility or other electrical source. Because CPLs exhibit a negative incremental input impedance, they pose stability concerns in both DC and AC systems. This paper presents a power converter for a constant power LED lighting load that mitigates these stability concerns by presenting a controllable input impedance to the electrical source. The use of an energy buffer allows the converter to control input power to resemble a resistive load over short times, while still delivering constant output power. Experimental results demonstrate that the converter exhibits a resistive input impedance at frequencies over 0.5 Hz while maintaining constant power to the LED load.
{"title":"Controlling the input impedance of constant power loads","authors":"Manuel Gutierrez, Peter A. Lindahl, A. Banerjee, S. Leeb","doi":"10.1109/APEC.2018.8341600","DOIUrl":"https://doi.org/10.1109/APEC.2018.8341600","url":null,"abstract":"Power electronic circuits often regulate load power and present a constant power load (CPL) to the utility or other electrical source. Because CPLs exhibit a negative incremental input impedance, they pose stability concerns in both DC and AC systems. This paper presents a power converter for a constant power LED lighting load that mitigates these stability concerns by presenting a controllable input impedance to the electrical source. The use of an energy buffer allows the converter to control input power to resemble a resistive load over short times, while still delivering constant output power. Experimental results demonstrate that the converter exhibits a resistive input impedance at frequencies over 0.5 Hz while maintaining constant power to the LED load.","PeriodicalId":113756,"journal":{"name":"2018 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134180214","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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