含均流环DC-DC变换器并联系统输出阻抗获取方法的研究

由于均流环的使用，变换器并联存在着稳定性问题，同时也给典型的变换器混联系统的稳定性分析带来困难。通过推导和化简工作，提出了含均流环DC-DC变换器并联系统输出阻抗的获取方法。该方法通过测量并联系统中各变换器使用特定的均流通讯线连接方式单独运行时的输出阻抗，并使用推导所得的公式得到各变换器在并联运行时的输出阻抗及并联系统总输出阻抗。所得到的输出阻抗可以用于整个混联系统的稳定性分析，并为该类型的电源系统产品节约了设计时间和成本。

Study on Output Impedance Acquirement Method of DC-DC Converters Paralleled System with Current Sharing Loop

Current sharing loop introduces stability problems of converters paralleled system and brings difficulties for the stability analysis of typical hybrid connection system. Through derivation and simplification, the output impedance acquirement method of converters paralleled system is proposed. In the proposed method, each module and total output impedance of paralleled system with active current sharing control in paralleled operation are derived by measuring the output impedance of each module working solely with particular connection ways of current sharing bus and calculation. The proposed output impedance derivation method can be used to predict the stability of the paralleled system while the modules are used in paralleled operation, which can save the cost and design time of the production of power supply system.