Affiliation:
1. College of Electrical Engineering, Guangxi University, Nanning 530004, China
Abstract
As a typical load, the constant power load (CPL) has negative impedance characteristics. The stability of the buck converter system with a mixed load of CPL and resistive load is affected by the size of the CPL. When the resistive load is larger than the CPL, the buck converter with the output voltage as an output function is a non-minimum phase nonlinear system, because its linear approximation has a right-half-plane pole. The non-minimum phase characteristic limits the application of many control techniques, but the objective holographic feedback linearization control (OHFLC) method is a good control strategy that can bypass the non-minimum phase system and make the system stable. However, the traditional OHFLC method, in designing the controller, generally uses a linear optimal quadratic design method to obtain a linear feedback control law. It requires a state quantity component with a one-order relative degree to the system. But it is not easy to find such a suitable state quantity with a one-order relative degree to the system. In this paper, an improved OHFLC method is proposed for Buck converters with a mixed loads of CPL and resistive loads, using the sliding mode control (SMC) theory to design the controller, so that the output state quantity components with different relative degrees to the system can be used in the holographic feedback linearization method. Finally, the simulation and experimental results also demonstrate that this method has the same, or even better, dynamic response performance and robustness than the traditional OHFLC method.
Subject
Electrical and Electronic Engineering,Computer Networks and Communications,Hardware and Architecture,Signal Processing,Control and Systems Engineering
Reference28 articles.
1. Control of a DC-DC Dual Active Bridge Converter in DC Microgrids Applications;Esteban;IEEE Lat. Am. Trans.,2021
2. Hybrid Controlled Multi-Input DC/DC Converter for Electric Vehicle Application;Mohan;Int. Trans. Electr. Energy Syst.,2023
3. Contemporary trends in power electronics converters for charging solutions of electric vehicles;Habib;CSEE J. Power Energy Syst.,2020
4. A Hybrid, Fully-Integrated, Dual-Output DC–DC Converter for Portable Electronics;Dam;IEEE Trans. Power Electron.,2020
5. A Cascaded Distributed Control Framework in DC Microgrids;Zhou;IEEE Trans. Smart Grid,2021