提出了一种考虑风电波动性的微电源逆变控制器参数优化方法。以可能出现的场景模拟微电网中风电的波动性,通过特征值的参数灵敏度选取对系统稳定性和动态响应特性影响较大的主导参数,最后利用一种新的综合ITAE(Integrated of Time—weig...提出了一种考虑风电波动性的微电源逆变控制器参数优化方法。以可能出现的场景模拟微电网中风电的波动性,通过特征值的参数灵敏度选取对系统稳定性和动态响应特性影响较大的主导参数,最后利用一种新的综合ITAE(Integrated of Time—weighted Absolute Error)指标构建参数优化的目标函数以评价微电源逆变控制器的控制性能。通过改进微分进化算法选取对应综合ITAE指标最小的样本参数为最优解。仿真计算结果表明:改进微分进化算法求解该优化问题时具有较好的收敛性,依据该方法设计的微电源逆变控制器参数对风电的波动具有良好的鲁棒性,系统在工况变化引起的过渡过程中拥有良好的动态响应品质。展开更多
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
Modeling method for the current control loop of a grid-connected PWM inverter with the LCL output filter was discussed.Firstly,the current control loop with the LCL inverter-side current as feedback was established.Th...Modeling method for the current control loop of a grid-connected PWM inverter with the LCL output filter was discussed.Firstly,the current control loop with the LCL inverter-side current as feedback was established.Then,parameters of PI controller were calculated on the basis of an equivalent controlled object.Finally,Norton equivalent circuit for the current control loop of grid-connected system was derived by integrating one control equation,which connected the PWM inverter output voltage and the LCL inverter-side current,with two circuit equations,separately using the LCL inverter-side current and the injected current as loop currents.With the induced Norton equivalent circuit,system-level resonant and unstable issues on real grid-connected system applied in weak distributed power systems can be easily analyzed.The validity of substituting Norton equivalent circuit for grid-connected system is verified by simulation and experiment.展开更多
文摘提出了一种考虑风电波动性的微电源逆变控制器参数优化方法。以可能出现的场景模拟微电网中风电的波动性,通过特征值的参数灵敏度选取对系统稳定性和动态响应特性影响较大的主导参数,最后利用一种新的综合ITAE(Integrated of Time—weighted Absolute Error)指标构建参数优化的目标函数以评价微电源逆变控制器的控制性能。通过改进微分进化算法选取对应综合ITAE指标最小的样本参数为最优解。仿真计算结果表明:改进微分进化算法求解该优化问题时具有较好的收敛性,依据该方法设计的微电源逆变控制器参数对风电的波动具有良好的鲁棒性,系统在工况变化引起的过渡过程中拥有良好的动态响应品质。
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Project(51307009)supported by the National Natural Science Foundation of ChinaProject(12JJ4045)supported by Hunan Provincial Natural Science Foundation,China+2 种基金Project(2011KFJJ003)supported by the Key Laboratory for Power Technology of Renewable Energy Sources of Hunan Province,ChinaProject(2011kfj14)supported by the Fund of Key Laboratory of Hunan Province about Power System Operation and Control,ChinaProject(454.13S-20)supported by the Enterprises’Postdoctoral Funds of Pudong Area of Shanghai,China
文摘Modeling method for the current control loop of a grid-connected PWM inverter with the LCL output filter was discussed.Firstly,the current control loop with the LCL inverter-side current as feedback was established.Then,parameters of PI controller were calculated on the basis of an equivalent controlled object.Finally,Norton equivalent circuit for the current control loop of grid-connected system was derived by integrating one control equation,which connected the PWM inverter output voltage and the LCL inverter-side current,with two circuit equations,separately using the LCL inverter-side current and the injected current as loop currents.With the induced Norton equivalent circuit,system-level resonant and unstable issues on real grid-connected system applied in weak distributed power systems can be easily analyzed.The validity of substituting Norton equivalent circuit for grid-connected system is verified by simulation and experiment.
