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Second-Order Disturbance-Observer-Based Output-Feedback Voltage Control of DC/DC Converters Using Pole-Zero Cancellation
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DOI：10.1109/tie.2026.3677705.png)
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Abstract
En 中文
The proposed approach establishes an observer-based proportional-integral (PI)-type feedback system structure in which a second-order disturbance observer (SO-DOB) acts as a feed-forward compensator, thereby removing the requirement for the true values of converter parameters and load information. This work offers three main technical contributions. First, a pole-zero cancellation (PZC)-based observer is developed with a specially designed gain structure that diagonalizes the estimation error dynamics in a model-independent manner. Second, the SO-DOB enables robust estimation of disturbances induced by plant-model mismatch and load uncertainty, while simultaneously imposing prescribed second-order closed-loop dynamics. Third, a single-loop PI-type controller integrates the PZC-based observer and the SO-DOB to ensure exponential convergence of the regulation error and critically damped input? output behavior through PZC, without the use of current feedback. Experimental verification on a 3 kW bidirectional converter prototype confirms the practical effectiveness of the proposed controller and demonstrates a 29<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">${\boldsymbol{\%}}$</tex-math></inline-formula> performance improvement in comparison with a recent method.
Keywords:
Disturbance observer
power converter
PI control
pole-zero cancellation (PZC)
state estimation
Journal
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7.2
Papers:
1.8W
Citations:
9.8W
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Cited Papers