Nonlinear control of dc/dc power converters with inherent current and power limitation
Nonlinear control of dc/dc power converters with inherent current and power limitation
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DOI：
10.1109/med.2016.7535991
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
G. Konstantopoulos;Qing-Chang Zhong
中科院分区：
文献类型：
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作者：
G. Konstantopoulos;Qing-Chang Zhong
本文针对不同类型的DC/DC功率变换器（升压型、降压-升压型），提出了一种具有固有限流能力的非线性控制器。所提出的控制器是基于应用一个动态虚拟电阻串联的转换器，根据一个非线性动态系统的电感的想法。结果表明，所提出的方法独立于转换器参数（电感，电容）或负载，并具有通用的结构，可以用来实现不同的监管方案，例如电压，电流或功率调节。基于Boost和Buck-Boost变换器的非线性模型，利用输入-状态稳定性理论，在适当选择控制器参数的情况下，分析证明了电感电流始终有界于给定的最大值之下。因此，所提出的控制策略提供了固有的保护属性，因为转换器的功率在瞬态或不切实际的功率需求期间被限制在给定值以下。两种类型的DC/DC转换器的仿真结果，以验证所需的控制器性能。
A nonlinear controller with an inherent current-limiting capability is presented in this paper for different types of dc/dc power converters (boost, buck-boost). The proposed controller is based on the idea of applying a dynamic virtual resistance in series with the inductor of the converter, which varies according to a nonlinear dynamical system. It is shown that the proposed approach acts independently from the converter parameters (inductance, capacitance) or the load and has a generic structure that can be used to achieve different regulation scenarios, e.g. voltage, current or power regulation. Based on the nonlinear model of the boost and the buck-boost converter, it is analytically proven that the inductor current remains always bounded below a given maximum value using input-to-state stability theory under a suitable choice of the controller parameters. Hence, the proposed control strategy offers an inherent protection property since the power of the converter is limited below a given value during transients or unrealistic power demands. Simulation results for both types of dc/dc converters are presented to verify the desired controller performance.