Matrix Converter Control Strategies and Applications

Matrix converters are single-stage AC-to-AC power electronic devices that enable direct frequency and voltage conversion without an intermediate DC link. Their inherent bidirectional power flow, compact size and absence of bulk energy storage components offer notable advantages in high-reliability and high-power-density applications. However, the fully bidirectional switching matrix presents a control challenge: the system is underactuated and nonlinear, demanding sophisticated modulation and control algorithms to ensure stable operation, optimal power quality and robust performance under varying load or supply conditions. Two principal control approaches have emerged. Direct control techniques employ space vector modulation schemes to synthesise output voltages and regulate input currents simultaneously, achieving adjustable power factor and harmonic suppression. Indirect control methods treat the converter as cascaded rectifier and inverter stages with a fictitious DC-link, simplifying the implementation of established DC-link control strategies but requiring precise commutation management. Recent research has focused on advanced vector modulation, predictive control and adaptive schemes that address issues such as unbalanced input voltages, common-mode voltage reduction, overmodulation and dynamic damping of oscillations. The global significance of these developments is underscored by practical applications in variable-speed motor drives, renewable-energy microgrids, electric-vehicle propulsion systems and smart grid interfaces. Concrete demonstrations include multiphase drives for aerospace and marine propulsion, resilient grid-tied converters for distributed generation and compact traction inverters for sustainable transport. Interconnections among studies highlight a trend towards digital implementation using DSPs and FPGAs, integration of real-time state estimation and the fusion of model predictive and vector-based control to meet stringent performance and efficiency targets.

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Matrix Converter Control Strategies and Applications publication trend

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Technical terms

Matrix converter: A direct AC-to-AC conversion topology using an array of bidirectional switches to connect any input phase to any output phase without a DC-link.

Direct matrix converter (DMC): A control approach that applies space vector modulation directly to the bidirectional switch network to synthesise output voltages and regulate input currents concurrently.

Indirect matrix converter (IMC): A method that models the converter as separate rectifier and inverter stages connected by a fictitious DC-link, facilitating conventional DC-link control but requiring careful commutation to avoid short circuits.

Space vector modulation (SVM): A pulse-width modulation technique that represents three-phase voltages or currents as a rotating vector in a two-dimensional plane, enabling efficient synthesis of reference waveforms.

Power factor: The ratio of real power delivered to the load to the apparent power drawn from the source, with unity indicating optimal alignment of voltage and current waveforms.

References

1. A novel control strategy for Matrix Converters based on Transient Power Balance. Automatica (2023).
2. Practical Implementation of the Indirect Control to the Direct 3 × 5 Matrix Converter Using DSP and Low-Cost FPGA. Sensors (2023).
3. On the Potential Contributions of Matrix Converters for the Future Grid Operation, Sustainable Transportation and Electrical Drives Innovation. Applied Sciences (2021).