Robust LQR Control for PWM Converters: An LMI Approach

By Carlos Olalla, Ramon Leyva, A. E. Aroudi, Isabelle Queinnec. IEEE transactions on industrial electronics (1982. Print), 2009

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Filter-Based Active Damping of Voltage Source Converters With $LCL$ Filter (2011, background): “Both need to be robust with respect to the parameter variation [7]–[9].”
Robust Sliding-Mode Control Design for a Voltage Regulated Quadratic Boost Converter (2015, methodology): “To solve this problem, different methods have been proposed such as robust gain scheduled control [13], robust linear quadratic regulator (LQR) control [14], robust nonlinear adaptive control [15], and internal mode control [16], among others.”
Robust Nonlinear Adaptive Control of a “Boost” Converter via Algebraic Parameter Identification (2014, methodology): “of the adaptive LQR controller, where the gain values of the adaptive LQR controller were chosen through the R and Q matrices (see [17]).”
Robust Gain-Scheduled Control of Switched-Mode DC–DC Converters (2012, methodology): “The uncertainty and the nonlinear dynamics of the boost converter have been modeled in different ways as in [42], [43], [49], [50].”