Enhancement of Steady State Response of Indirect Finite Control Set Model Predictive Control.

ISIE（2023）

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Abstract

In this work, a simple method is presented to improve the steady-state response of indirect finite control set model predictive control (I-FCS-MPC) techniques. The I-FCSMPC methods return the discrete optimal solution, and this solution will be closest to its continuous counterpart in steady-state i.e., at maximum ± 0.5 away from the actual continuous solution. Based on this observation, a few more continuous options within the range ± 0.5 are evaluated on the solution from I-FCS-MPC. Then the option among these which gives the minimum cost is used for the modulation stage. Simulations demonstrate that for a 19-level modular multilevel converter, the total harmonic distortion is reduced by 56% by the proposed method as compared to full I-FCS-MPC and 55% as compared to one of the computationally efficient versions of I-FCS-MPC.

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Key words

circulating current,capacitor voltage balancing,model predictive control (MPC),modular multilevel converter (MMC),total harmonic distortion (THD)

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