为了提升虚拟直流电机的电压惯量与阻尼支持能力,并进一步简化附加控制器结构,显著改善直流微网的动态稳定性,提出了一种新型的虚拟直流电机控制(virtual DC machine control,VDMC)。首先,将双向DC/DC换流器与直流电机进行类比,通过模...为了提升虚拟直流电机的电压惯量与阻尼支持能力,并进一步简化附加控制器结构,显著改善直流微网的动态稳定性,提出了一种新型的虚拟直流电机控制(virtual DC machine control,VDMC)。首先,将双向DC/DC换流器与直流电机进行类比,通过模拟直流电机的功率调节特性,得到适用于双向DC/DC换流器的VDMC模型。其次,通过对所提出VDMC进行改进,得到了更为简化的控制结构,并且具备更加优越的电压动态性能和惯性支撑能力。在此基础上,对改进后的虚拟电机设计自适应电压惯量调节控制技术,使其能够动态响应电压变化,进一步提高系统的动态稳定性。最后,根据阻抗比判据,理论分析所提VDMC对系统的稳定性支持作用,并通过时域仿真算例,验证所提控制策略的有效性。展开更多
To reduce output voltage noise and improve dynamic response performance,this study designed a buck converter on the basis of secondary filters and adaptive voltage positioning(AVP).A hybrid control method was proposed...To reduce output voltage noise and improve dynamic response performance,this study designed a buck converter on the basis of secondary filters and adaptive voltage positioning(AVP).A hybrid control method was proposed for the compensation of the secondary filter.The introduction of a high-frequency feedback path,in addition to the traditional feedback path,effectively improved the influence of the secondary filter on the loop stability and direct current regulation performance.A small-signal model of the buck converter based on the proposed control method was derived,and the stability and selection of control parameters were analyzed.AVP is realized using an easy-to-implement and low-cost control method that was proposed to improve dynamic response performance by changing the low-frequency gain of the control loop and load regulation of the output voltage.The experimental results of the buck converter showed that the proposed method effectively reduced the output voltage noise by 50%and improved the dynamic response capability to meet the target requirements of mainstream electronic systems.展开更多
文摘为了提升虚拟直流电机的电压惯量与阻尼支持能力,并进一步简化附加控制器结构,显著改善直流微网的动态稳定性,提出了一种新型的虚拟直流电机控制(virtual DC machine control,VDMC)。首先,将双向DC/DC换流器与直流电机进行类比,通过模拟直流电机的功率调节特性,得到适用于双向DC/DC换流器的VDMC模型。其次,通过对所提出VDMC进行改进,得到了更为简化的控制结构,并且具备更加优越的电压动态性能和惯性支撑能力。在此基础上,对改进后的虚拟电机设计自适应电压惯量调节控制技术,使其能够动态响应电压变化,进一步提高系统的动态稳定性。最后,根据阻抗比判据,理论分析所提VDMC对系统的稳定性支持作用,并通过时域仿真算例,验证所提控制策略的有效性。
文摘To reduce output voltage noise and improve dynamic response performance,this study designed a buck converter on the basis of secondary filters and adaptive voltage positioning(AVP).A hybrid control method was proposed for the compensation of the secondary filter.The introduction of a high-frequency feedback path,in addition to the traditional feedback path,effectively improved the influence of the secondary filter on the loop stability and direct current regulation performance.A small-signal model of the buck converter based on the proposed control method was derived,and the stability and selection of control parameters were analyzed.AVP is realized using an easy-to-implement and low-cost control method that was proposed to improve dynamic response performance by changing the low-frequency gain of the control loop and load regulation of the output voltage.The experimental results of the buck converter showed that the proposed method effectively reduced the output voltage noise by 50%and improved the dynamic response capability to meet the target requirements of mainstream electronic systems.
