简介:摘要现如今,我国的科技在不断的发展,电力技术不断的进步。为解决作为中压直流配网与低压直流微网互联设备的直流固态变压器(DCsolidstatetransformer,DCSST)子模块均压均流问题,同时实现微网直流母线电压的稳定控制及灵活双向功率运行能力,提出了一种以DCSST输出电压稳定为主控制环,输入电压均衡为附加控制环的双环解耦控制策略。针对其输入串联输出并联(input-seriesoutput-parallel,ISOP)结构及隔离型双向DC/DC变换器(isolatedbidirectionalDC/DCconverter,IBDC)移相控制原理,对DCSST进行统一建模,并通过对其小信号线性模型及传递函数的推导,分析了两控制环路之间的解耦条件。仿真与实验结果表明,在所提出的控制策略以及控制参数下,DCSST双向功率运行时输出电压稳定与输入电压均衡控制效果良好,同时,各IBDC模块采用交错控制可有效减小输出电流纹波。
简介:摘要:目前,我国的经济在快速发展,社会在不断进步,为减小移动变电站中主变压器的体积和质量,提高移动变电站的高压侧电能质量,提出一种用于移动变电站的固态变压器拓扑。所提出的固态变压器由AC-AC变换器、高频多脉波整流器、工频逆变器三部分组成,该文首先分析了AC-AC变换器的工作原理,并从降低开关损耗的角度出发,设计其控制策略;然后从磁路和电路对称的角度出发,设计用于高频多脉波整流器的移相变压器,并应用开关函数法计算固态变压器的输入电流和输出电压;最后设计固态变压器中AC-AC变换器的控制和驱动电路,搭建了移动变电站的缩比仿真和实验平台。仿真和实验结果表明,使用固态变压器代替传统的工频主变压器后,主变压器体积减小了三分之二,其体积和质量得到显著降低;使用所设计的三相五芯柱变压器作为移相变压器后,固态变压器的输入电流总谐波畸变率(THD)值由22%降到了16%,有效提高了移动变电站的电能质量。
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