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Abstract-In this paper a four-legs matrix converter is proposed as the power conversion core for Aircraft Ground Power Unit (GPU) applications. This structure allows easy management of unbalanced and non-linear loads with minimal disruption of the power supply operation.A hybrid repetitive-traditional control system is proposed to regulate the output voltage of the GPU. This solution reduces the steady state tracking error, maintaining fast dynamics characteristics, and increases the stability of the converter compared to conventional approaches.Simulations and experimental results from a 7.5KW converter prototype are presented to verify the operation of the proposed configuration and to prove the effectiveness of the solution.

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The technology of direct AC/AC power conversion (Matrix converters) is gaining increasing interest in the scientific community, particularly for aerospace applications. In this paper a repetitive control system is proposed to regulate the output voltage of a four-leg matrix converter for a power supply application. The target application is a Ground Power Supply unit (GPU) for aircraft servicing where a filtered, stable output voltage is required. The proposed control structure reduces the tracking error between the output and reference as well as increasing the stability of the converter under balanced and unbalanced load conditions. SABER and MATLAB simulations have been used to verify the operation of the proposed control strategy.

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In the post-industrial digital-economy, motors powering manufacturing have been replaced by computers powering ecommerce-with significant financial losses attributable to poor power quality (PQ). At the same time, increasing penetration of distributed generation and constant power loads complicate the job for the electric utilities to deliver high-quality electrical power. Traditionally, voltage source converters provide PQ compensation; the backbone of these converters, however, are large electrolytic capacitors (e-caps), which have well-known failure rates. A D-STATCOM that does not use e-caps was shown to increase the converter service life and increase the reliability of the power system; finite control set model predictive control (MPC) was shown to achieve high fidelity tracking for multi-objective cost functions. However, high fidelity (to achieve low total harmonic distortion) results in high switching frequency, which increases losses and device stresses, and reduces the overall converter reliability. This paper improves the capacitorless D-STATCOM by investigating an adaptive MPC that trades-off highfidelity performance and switching frequency, subject to IEEE 519 THD standards, to achieve good-enough performance. The method is verified experimentally in a 7.5 kVA D-STATCOM hardware prototype. The results show a reduction in switching frequency by over 30% compared with the MPC methods that prioritize high-fidelity alone.

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