As to the concrete topology of three-phase LCL type grid-connected inverter with damping resistance, mathematical model was deduced in detail, using method of equivalent transformation to the structure diagram, dampin...As to the concrete topology of three-phase LCL type grid-connected inverter with damping resistance, mathematical model was deduced in detail, using method of equivalent transformation to the structure diagram, damping resistance was virtualized, mathematical model under the DQ frame that can realize decoupling control was established, a dual-loop control strategy for grid-connected inverter with LCL filter was proposed, the system stability was analyzed and the design method of controller was given. The proposed method overcame the flaws of loss increase, efficiency reduce and cost increase which were caused by damping resistance in LCL type grid-connected inverter, the system efficiency and power supply quality of the output were improved. Feasibility and effectiveness of the new method were validated by simulation and experimental results.展开更多
The paper presents a successful design and good result of grid voltage feed-forward control strategy with no damping regulator of LCL filter applied in Three-phase Pulse Width Modulation( PWM) rectifier under unbalanc...The paper presents a successful design and good result of grid voltage feed-forward control strategy with no damping regulator of LCL filter applied in Three-phase Pulse Width Modulation( PWM) rectifier under unbalance grid condition for renewable energy processing. It is demonstrated that the closed-loop current control is decoupled with the grid voltage feed-forward control,and good waveform of grid current with low order harmonics is obtained under unbalance grid condition. This novel strategy is simple and reliable,applied with PI regulator but no resonant controller in α,β two-phase stationary frame. Moreover,the results of experiment and simulation are also illustrated to validate the novel strategy well applied in the closed-loop current control system under unbalanced grid condition.展开更多
为了降低直流微网系统中负载变化或者多源出力变化引起的功率波动,提出一种同时考虑蓄电池和超级电容荷电状态(state of charge,SOC)的混合储能协调控制策略。首先,分析直流微网系统协调控制原理,在此基础上,通过低通滤波器对所需平抑...为了降低直流微网系统中负载变化或者多源出力变化引起的功率波动,提出一种同时考虑蓄电池和超级电容荷电状态(state of charge,SOC)的混合储能协调控制策略。首先,分析直流微网系统协调控制原理,在此基础上,通过低通滤波器对所需平抑功率进行分频,低频功率由蓄电池承担,高频功率及系统开关的高频纹波由超级电容承担,根据频率响应确定了滤波器的时间常数调整原则;然后,将超级电容和蓄电池各自的SOC实时状态作为反馈观测量,根据两者的SOC状态并结合实际功率需求,将系统划分成11个工作模式,分析了不同工作模式下的功率需求,依据不同工作模式下的功率需求进行功率调整,进而实现功率二次分配;最后,将所提策略在4种典型情况下进行仿真验证,实验结果验证了该策略的有效性。展开更多
文摘As to the concrete topology of three-phase LCL type grid-connected inverter with damping resistance, mathematical model was deduced in detail, using method of equivalent transformation to the structure diagram, damping resistance was virtualized, mathematical model under the DQ frame that can realize decoupling control was established, a dual-loop control strategy for grid-connected inverter with LCL filter was proposed, the system stability was analyzed and the design method of controller was given. The proposed method overcame the flaws of loss increase, efficiency reduce and cost increase which were caused by damping resistance in LCL type grid-connected inverter, the system efficiency and power supply quality of the output were improved. Feasibility and effectiveness of the new method were validated by simulation and experimental results.
文摘The paper presents a successful design and good result of grid voltage feed-forward control strategy with no damping regulator of LCL filter applied in Three-phase Pulse Width Modulation( PWM) rectifier under unbalance grid condition for renewable energy processing. It is demonstrated that the closed-loop current control is decoupled with the grid voltage feed-forward control,and good waveform of grid current with low order harmonics is obtained under unbalance grid condition. This novel strategy is simple and reliable,applied with PI regulator but no resonant controller in α,β two-phase stationary frame. Moreover,the results of experiment and simulation are also illustrated to validate the novel strategy well applied in the closed-loop current control system under unbalanced grid condition.
文摘为了降低直流微网系统中负载变化或者多源出力变化引起的功率波动,提出一种同时考虑蓄电池和超级电容荷电状态(state of charge,SOC)的混合储能协调控制策略。首先,分析直流微网系统协调控制原理,在此基础上,通过低通滤波器对所需平抑功率进行分频,低频功率由蓄电池承担,高频功率及系统开关的高频纹波由超级电容承担,根据频率响应确定了滤波器的时间常数调整原则;然后,将超级电容和蓄电池各自的SOC实时状态作为反馈观测量,根据两者的SOC状态并结合实际功率需求,将系统划分成11个工作模式,分析了不同工作模式下的功率需求,依据不同工作模式下的功率需求进行功率调整,进而实现功率二次分配;最后,将所提策略在4种典型情况下进行仿真验证,实验结果验证了该策略的有效性。