Abstract As one of the important energy conversion systems in renewable energy power generation, the two‐stage DC‐DC converter cascaded system composed of source converter and load converter has been widely used in industrial applications. Different from the constant voltage load of the traditional DC‐DC converter, the load converter in the cascaded converter, as the constant power load of the source converter, has an obvious impact on the stability of the source converter. In this paper, the cascaded system composed of Cuk converter as source converter and buck‐boost converter as load converter is studied. Analyses results show that with increasing of power load, a Floquet multiplier of monodromy matrix belongs to the converter cascaded system traverses the unit circle from outside to inside along negative real axis and will suddenly jump out of the unit circle when the power load reaches a specific value. Correspondingly, the entire system gradually moves from period‐doubling bifurcation state to period‐1 limit cycle and then suddenly jumps to chaos state. With application of monodromy matrix theory and sinusoidal voltage compensation method, stability boundary of the system is extended and nonlinear behaviors are stabilized. Finally, simulation and experimental results verify the feasibility of analytical technique and conclusions.
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