Open AccessStabilization of DC–DC buck converter with unknown constant power load via passivity‐based control plus proportion‐integration
Author(s) -
He Wei,
Namazi Mohammad Masoud,
Koofigar Hamid Reza,
Amirian Mohammad Ali,
Blaabjerg Frede
Publication year - 2021
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/pel2.12205
Subject(s) - control theory (sociology) , passivity , buck converter , stability (learning theory) , pid controller , controller (irrigation) , constant (computer programming) , power (physics) , electric power system , computer science , mathematics , engineering , control (management) , control engineering , physics , temperature control , agronomy , electrical engineering , quantum mechanics , artificial intelligence , machine learning , biology , programming language
It is known that constant power load (CPL) may cause a negative impedance, which seriously affects the stability of power system. In this paper, a new control algorithm for DC–DC buck converter feeding unknown CPL is proposed. First, under the assumption of known extracted power load, the standard passivity–based control (PBC) is presented to reshape the system energy and compensate for the negative impedance and a proportion‐integration (PI) action around passive output is added to improve disturbance rejection performance, which forms the PBC plus PI (PBC+PI). Then, a parameter estimation algorithm is developed, based on immersion and invariance (I&I) technique, in order to online estimate the extracted power load. In the next step, the online estimation scheme is adopted to construct an adaptive strategy. Finally, the stability analysis of the cascaded system containing a closed‐loop control system and observer error dynamics is conducted. Simulation and experimental results are demonstrated to validate the performance of the proposed controller.