Abstract
Constant power loads have negative impedance characteristics, which reduce the damping of DC/DC converter systems and have negative effects on the stability of the DC microgrid. In this paper, a finite-time parameter observer-based sliding mode controller is proposed for a boost converter with constant power loads. Firstly, a non-singular terminal sliding-mode controller is designed based on the flatness of the differential and sliding mode control theory. Secondly, a finite-time observer is designed to estimate the input voltage and tunes the parameter of the controller in time. Thirdly, the finite-time stability of the closed-loop system is proved through the proposed controller. Finally, the effectiveness and robustness of the proposed controller with unknown input voltage are verified by simulation. The proposed controller can guarantee finite-time convergence without input voltage sensors, which can reduce system cost and improve system reliability.
Highlights
In [5], a robust, optimal power-management system is proposed for hybrid AC/DC microgrids to maximize the use of renewable energy and reduce the use of fuel energy
In [6], direct sliding mode controllers were designed combined with the perturb and observe method for DC boost converters to increase the photovoltaic system’s dynamic performance and ensure the stability of the system voltage
In order to ensure the stable operation of DC microgrids, the control problem of DC/DC converters with constant power loads (CPLs) has attracted the attention of many scholars
Summary
Energy is the material basis for promoting economic and social development. Due to the exhaustion of traditional energy and increasing air pollution, the demand for renewable energy such as water, wind, and solar energy is gradually increasing [1]. In [6], direct sliding mode controllers were designed combined with the perturb and observe method for DC boost converters to increase the photovoltaic system’s dynamic performance and ensure the stability of the system voltage. In order to ensure the stable operation of DC microgrids, the control problem of DC/DC converters with CPLs has attracted the attention of many scholars. There are numerous strategies proposed for power electronics converter systems with CPLs to mitigate the impacts of CPLs. One of the basic control strategies is the passivedamping method, which adds necessary capacitors, resistors, and inductors to the system to increase system damping. In [39], an objective holographic feedback linearization control method, which has strong robustness, was designed for the boost converter with CPL. In [343o]f,16 an adaptive backstepping sliding mode control strategy for a boost converter with CPL was proposed, combined with feedback linearization technology. The output vc of the closed-loop system can converge to the desired value v∗ in finite time
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