An observer-based fault diagnosis method and a fault tolerant control for open-switch fault and current sensor fault are proposed for interleaved flyback converters of a micro-inverter system. First, based on the topo...An observer-based fault diagnosis method and a fault tolerant control for open-switch fault and current sensor fault are proposed for interleaved flyback converters of a micro-inverter system. First, based on the topology of a grid-connected micro-inverter, a mathematical model of the flyback converters is established. Second, a state observer is applied to estimate the currents online and generate corresponding residuals. The fault is diagnosed by comparing the residuals with the thresholds. Finally, a fault-tolerant control that consists of a fault-tolerant topology for the faulty switch and a simple software redundancy control for the faulty current sensor, is proposed to achieve a fault-tolerant operation. The feasibility and effectiveness of the proposed method has been verified by simulation and experimental results.展开更多
In single-phase photovoltaic(PV)systems,power mismatch between input and output terminal leads to power pulsation,seriously affecting maximum power point tracking(MPPT).Paralleling an electrolytic capacitor(e-cap)acro...In single-phase photovoltaic(PV)systems,power mismatch between input and output terminal leads to power pulsation,seriously affecting maximum power point tracking(MPPT).Paralleling an electrolytic capacitor(e-cap)across the PV panel to smooth power pulsation seems to be an unreliable method owing to its short lifespan.Various power decoupling methods used in micro-inverters have been proposed to solve the problem.These methods were categorized.Some of them were introduced in this paper regarding efficiency,cost and technical features.Special novel methods proposed in recent years were presented to show the development trend of micro-inverter.Then,conclusion and comparisons were made.Finally,a potential technological route was proposed by author for further study on power decoupling.展开更多
In this paper, a new inverter topology dedicated to isolated or grid-connected PV systems is proposed. This inverter is based on the structures of a stacked multi-cell converter (SMC) and an H-bridge. This new topolog...In this paper, a new inverter topology dedicated to isolated or grid-connected PV systems is proposed. This inverter is based on the structures of a stacked multi-cell converter (SMC) and an H-bridge. This new topology has allowed the voltage stresses of the converter to be distributed among several switching cells. Secondly, divide the input voltage into several fractions to reduce the number of power semiconductors to be switched. In this contribution, the general topology of this micro-inverter has been described and the simulation tests developed to validate its operation have been presented. Finally, we discussed the simulation results, the efficiency of this topology and the feasibility of its use in a grid-connected photovoltaic production system.展开更多
基金Project(2012AA051601)supported by the High-Tech Research and Development Program of China
文摘An observer-based fault diagnosis method and a fault tolerant control for open-switch fault and current sensor fault are proposed for interleaved flyback converters of a micro-inverter system. First, based on the topology of a grid-connected micro-inverter, a mathematical model of the flyback converters is established. Second, a state observer is applied to estimate the currents online and generate corresponding residuals. The fault is diagnosed by comparing the residuals with the thresholds. Finally, a fault-tolerant control that consists of a fault-tolerant topology for the faulty switch and a simple software redundancy control for the faulty current sensor, is proposed to achieve a fault-tolerant operation. The feasibility and effectiveness of the proposed method has been verified by simulation and experimental results.
基金Supported by National Natural Science Funds(51467006,51467005)Science and Technology Industrial Planning Project of Jiangxi Province,China(20151BBE50118,20161BBH80032)Science and Technology Project of Education Department in Jiangxi Province(GJJ160489).
文摘In single-phase photovoltaic(PV)systems,power mismatch between input and output terminal leads to power pulsation,seriously affecting maximum power point tracking(MPPT).Paralleling an electrolytic capacitor(e-cap)across the PV panel to smooth power pulsation seems to be an unreliable method owing to its short lifespan.Various power decoupling methods used in micro-inverters have been proposed to solve the problem.These methods were categorized.Some of them were introduced in this paper regarding efficiency,cost and technical features.Special novel methods proposed in recent years were presented to show the development trend of micro-inverter.Then,conclusion and comparisons were made.Finally,a potential technological route was proposed by author for further study on power decoupling.
文摘In this paper, a new inverter topology dedicated to isolated or grid-connected PV systems is proposed. This inverter is based on the structures of a stacked multi-cell converter (SMC) and an H-bridge. This new topology has allowed the voltage stresses of the converter to be distributed among several switching cells. Secondly, divide the input voltage into several fractions to reduce the number of power semiconductors to be switched. In this contribution, the general topology of this micro-inverter has been described and the simulation tests developed to validate its operation have been presented. Finally, we discussed the simulation results, the efficiency of this topology and the feasibility of its use in a grid-connected photovoltaic production system.
