Abstract
This paper proposes an offset-free proportional-type output voltage-tracking algorithm embedding the disturbance observers (DOBs) for the N-phase interleaved DC/DC boost converter through a systematical multivariable approach. The contributions of this article fall into two parts. The first one is to design the first-order nonlinear DOBs for exponentially estimating the disturbances caused by the model-plant mismatches. The second one is to prove that the proposed proportional-type controller equipped with the DOBs guarantees the performance recovery property as well as the offset-free property. The performance of the proposed method is evaluated through simulations and experiments using a 3-kW four-phase interleaved DC/DC boost converter, comparing the proposed and feedback linearizing (FL) methods.
Highlights
The DC/DC converters have been widely utilized to supply a high quality DC power despite the disturbances for a variety of industrial applications such as uninterruptible power supply and solar photovoltaic systems [1,2,3,4,5,6]
The proportional-integral (PI) controller equipped with nonlinearity cancellation terms has been mainly used for implementing both inner-loop and outerloop controllers [7, 8], which can be interpreted as an feedback linearizing (FL) method in the control theoretical point of view
The corresponding control gains were determined for the resulting closed-loop error dynamics to be the desired low-pass filter (LPF) behavior using the converter parameters such as inductance and capacitance values
Summary
The DC/DC converters have been widely utilized to supply a high quality DC power despite the disturbances for a variety of industrial applications such as uninterruptible power supply and solar photovoltaic systems [1,2,3,4,5,6]. The novelties of the proposed method are twofold; the exponentially convergent DOBs are constructed for the current and output voltage loops, and the proportional-type nonlinear controller is developed with the exponential performance recovery property and the proof of the offset-free property These two novelties simplify the implementations of the control algorithm by eliminating the use of tracking error integrators with the anti-windup parts as well as the gain scheduling algorithms, which is the sharp contrast to the above mentioned existent methods such as model predictive and adaptive methods. ∀t ≥ 0, with the nominal inductance and capacitance values of L0, C0, and the initial input voltage Vin,0, where wL,i,o(t), wV,o(t) denote the unknown lumped disturbances caused from the parameter mismatch, unmodelled dynamics, and load uncertainties
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