研究了一种新颖的反激式并网逆变器,从电路拓扑、控制策略、稳态原理特性、关键电路参数设计等相关内容对此逆变器进行了研究分析,此并网逆变器是由具有多路串联同时选择功率开关的隔离反激直流变换器和极性反转逆变桥级联组合而成,采...研究了一种新颖的反激式并网逆变器,从电路拓扑、控制策略、稳态原理特性、关键电路参数设计等相关内容对此逆变器进行了研究分析,此并网逆变器是由具有多路串联同时选择功率开关的隔离反激直流变换器和极性反转逆变桥级联组合而成,采用输出电流瞬时值反馈最大功率输出SPWM控制策略。设计并研制了500 W 38 V DC/220V50HzAC的实验样机,其电路结构简洁、输入输出电气隔离、输出并网电流优质、变换效率高,在小功率多输入源联合供电场合具有重要应用价值。展开更多
In this study, a novel approach for dynamic modeling and closed-loop control of hybrid grid-connected renewable energy system with multi-input multi-output(MIMO) controller is proposed. The studied converter includes ...In this study, a novel approach for dynamic modeling and closed-loop control of hybrid grid-connected renewable energy system with multi-input multi-output(MIMO) controller is proposed. The studied converter includes two parallel DC-DC boost converters, which are connected into the power grid through a single-phase H-bridge inverter. The proposed MIMO controller is developed for maximum power point tracking of photovoltaic(PV)/fuel-cell(FC) input power sources and output power control of the grid-connected DC-AC inverter. Considering circuit topology of the system, a unique MIMO model is proposed for the analysis of the entire system. A unique model of the system includes all of the circuit state variables in DCDC and DC-AC converters. In fact, from the viewpoint of closed-loop controller design, the hybrid grid-connected energy system is an MIMO system. The control inputs of the system are duty cycles of the DC-DC boost converters and the amplitude modulation index of DC-AC inverters. Furthermore, the control outputs are the output power of the PV/FC input power sources as well as AC power injected into the power grid. After the development of the unique model for the entire system, a decoupling network is introduced for system input-output linearization due to inherent connection of the control outputs with all of the system inputs. Considering the decoupled model and small signal linearization, the required linear controllers are designed to adjust the outputs. Finally, to evaluate the accuracy and effectiveness of the designed controllers, the PV/FC based grid-connected system is simulated using the MATLAB/Simulink toolbox.展开更多
文摘研究了一种新颖的反激式并网逆变器,从电路拓扑、控制策略、稳态原理特性、关键电路参数设计等相关内容对此逆变器进行了研究分析,此并网逆变器是由具有多路串联同时选择功率开关的隔离反激直流变换器和极性反转逆变桥级联组合而成,采用输出电流瞬时值反馈最大功率输出SPWM控制策略。设计并研制了500 W 38 V DC/220V50HzAC的实验样机,其电路结构简洁、输入输出电气隔离、输出并网电流优质、变换效率高,在小功率多输入源联合供电场合具有重要应用价值。
基金supported by Islamic Azad University–Ardabil Branch。
文摘In this study, a novel approach for dynamic modeling and closed-loop control of hybrid grid-connected renewable energy system with multi-input multi-output(MIMO) controller is proposed. The studied converter includes two parallel DC-DC boost converters, which are connected into the power grid through a single-phase H-bridge inverter. The proposed MIMO controller is developed for maximum power point tracking of photovoltaic(PV)/fuel-cell(FC) input power sources and output power control of the grid-connected DC-AC inverter. Considering circuit topology of the system, a unique MIMO model is proposed for the analysis of the entire system. A unique model of the system includes all of the circuit state variables in DCDC and DC-AC converters. In fact, from the viewpoint of closed-loop controller design, the hybrid grid-connected energy system is an MIMO system. The control inputs of the system are duty cycles of the DC-DC boost converters and the amplitude modulation index of DC-AC inverters. Furthermore, the control outputs are the output power of the PV/FC input power sources as well as AC power injected into the power grid. After the development of the unique model for the entire system, a decoupling network is introduced for system input-output linearization due to inherent connection of the control outputs with all of the system inputs. Considering the decoupled model and small signal linearization, the required linear controllers are designed to adjust the outputs. Finally, to evaluate the accuracy and effectiveness of the designed controllers, the PV/FC based grid-connected system is simulated using the MATLAB/Simulink toolbox.
