Buck-Boost变换器对未知恒功率负载的电压调节：基于自适应无源性的控制
Voltage regulation in buck--boost coniverters feeding an unknown constant power load: an adaptive passivity-based control
摘要：
配电系统和可再生能源的快速发展拓宽了直流-直流降压-升压变换器在直流电压调节中的应用。应用包括车辆电力系统、在低电压下发电的可再生能源以及直流微电网。应注意的是，在这些应用中的转换器的级联连接可能会导致不稳定性，这是由于充当负载的转换器具有恒定功率负载（CPL）行为的事实。在本文中，一个降压-升压转换器的输出电压调节问题的CPL供电解决。反馈控制器的构造是基于互联和阻尼分配控制技术。此外，提出了一种浸入和不变性参数估计器在线计算提取的负载功率，这是在实际应用中难以测量。通过设计确保期望的操作点是（局部）渐近稳定的，具有保证的吸引域。该方法通过计算机仿真和实验原型验证。
英文摘要：
Rapid developments in power distribution systems and renewable energy have widened the applications of dc--dc buck--boost converters in dc voltage regulation. Applications include vehicular power systems, renewable energy sources that generate power at a low voltage, and dc microgrids. It is noted that the cascade--connection of converters in these applications may cause instability due to the fact that converters acting as loads have a constant power load (CPL) behavior. In this paper, the output voltage regulation problem of a buck--boost converter feeding a CPL is addressed. The construction of the feedback controller is based on the interconnection and damping assignment control technique. Additionally, an immersion and invariance parameter estimator is proposed to compute online the extracted load power, which is difficult to measure in practical applications. It is ensured through the design that the desired operating point is (locally) asymptotically stable with a guaranteed domain of attraction. The approach is validated via computer simulations and experimental prototyping.
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