电动汽车负荷的投切易造成充电站直流微网(Direct Current Microgrid,DC-MG)母线电压振荡甚至失稳。为平抑电压波动,通过分析系统惯量来源提出一种可改善系统阻尼特性和惯性效应的虚拟直流电机控制策略。建立该控制策略下Boost电路的小...电动汽车负荷的投切易造成充电站直流微网(Direct Current Microgrid,DC-MG)母线电压振荡甚至失稳。为平抑电压波动,通过分析系统惯量来源提出一种可改善系统阻尼特性和惯性效应的虚拟直流电机控制策略。建立该控制策略下Boost电路的小信号模型,推导出直流电压与输出电流之间的小信号传递函数,分析充电站受到扰动时母线电压的动态特性。利用二阶简化模型的零极点分布分析控制参数对动态响应过程的影响,用于指导控制参数的选取。仿真结果验证了所提控制策略的有效性和可靠性。展开更多
We report a detailed theoretical study of current oscillation and de-voltage-controlled chaotic dynamics in doped GaAs/AlAs resonant tunneling superlattices under crossed electric and magnetic fields. When the superla...We report a detailed theoretical study of current oscillation and de-voltage-controlled chaotic dynamics in doped GaAs/AlAs resonant tunneling superlattices under crossed electric and magnetic fields. When the superlattice is biased at the negative differential velocity region, current self-oscillation is observed with proper doping concentration. The current oscillation mode and oscillation frequency can be affected by the dc voltage bias, doping density, and magnetic field. When an ac electric field with fixed amplitude and frequency is also applied to the system, different nonlinear properties show up in the external circuit with the change of dc voltage bias. We carefully study these nonlinear properties with different chaos-detecting methods.展开更多
文摘电动汽车负荷的投切易造成充电站直流微网(Direct Current Microgrid,DC-MG)母线电压振荡甚至失稳。为平抑电压波动,通过分析系统惯量来源提出一种可改善系统阻尼特性和惯性效应的虚拟直流电机控制策略。建立该控制策略下Boost电路的小信号模型,推导出直流电压与输出电流之间的小信号传递函数,分析充电站受到扰动时母线电压的动态特性。利用二阶简化模型的零极点分布分析控制参数对动态响应过程的影响,用于指导控制参数的选取。仿真结果验证了所提控制策略的有效性和可靠性。
基金The project supported by the National Fund for Distinguished Young Scholars of China under Grant No. 60425415, the Major Project of National Natural Science Foundation of China under Grant No. 10390162, and the Shanghai Municipal Commission of Science and Technology under Grant Nos. 03JC14082 and 05XD14020
文摘We report a detailed theoretical study of current oscillation and de-voltage-controlled chaotic dynamics in doped GaAs/AlAs resonant tunneling superlattices under crossed electric and magnetic fields. When the superlattice is biased at the negative differential velocity region, current self-oscillation is observed with proper doping concentration. The current oscillation mode and oscillation frequency can be affected by the dc voltage bias, doping density, and magnetic field. When an ac electric field with fixed amplitude and frequency is also applied to the system, different nonlinear properties show up in the external circuit with the change of dc voltage bias. We carefully study these nonlinear properties with different chaos-detecting methods.
