Abstract
As a basic structure of the distributed power systems, cascaded DC-DC converter systems have attracted a lot of attention. However, due to the interaction between the sub-converters, classic methods for modeling cascaded systems are either not accurate enough, such as state-space averaging model, or not simple enough, such as discrete-time mapping model, especially the systems with different switching frequencies. To overcome this drawback, a simplified discrete-time mapping modeling method for cascaded DC-DC converter systems is proposed in this paper. Based on the idea of state-space average, the original problem is simplified to modeling cascaded DC-DC converter systems with same switching frequencies. The proposed method is able to predict the dynamic properties of the system at all stages, such as slow-scale and fast-scale instabilities. Then, two-stage cascaded boost converter with different switching frequencies under peak current double loop control is taken as an example to present the simplified discrete-time mapping model. Finally, the effectiveness of the proposed method is verified by simulations and experiments.
Published Version
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