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一种新型研究Boost电路大信号稳定性的模型

, PP. 188-194

Keywords: 大信号模型,Boost变流器,级联系统,峰值电流控制,降阶模型

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Abstract:

随着科技的不断进步,多模块系统越来越多地被运用在各种复杂的应用场合。其中级联是应用最广泛的连接形式。级联稳定性(包括小信号稳定性和大信号稳定性)是系统可靠运行的关键因素。由于电力电子变流器属于强非线性系统,直接分析单级变流器或者级联系统的大信号稳定性是极其复杂的,故建立一种简单、有效的大信号模型是研究系统大信号稳定性的基础。本文以峰值电流控制下的Boost电路为例,提出了一种新的大信号模型。该模型利用功率守恒原理,在平均化的同时,实现了不同工作条件下(如CCM和DCM)大信号模型的统一,并实现了系统的降阶,适合系统行为级建模及后续级联系统大信号稳定性分析。仿真和实验均证明了模型的正确性。

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