Background: A grid-tied strategy of matrix converter (MC) based on the dual-side current
closed loop is presented here.
Methods: This paper designs dual-closed-loop regulators in which source current and grid current are
used as the outer-loop and the inner-loop controlled variables, derives the duty ratio expressions of MC
in different time slot, and complete the prototype. The capacitor voltage and the inductance current of
the filter are used as the state variables of the inner-loop in system and the virtual rectifier parameters of
MC are corrected real time to improve accuracy and to get the unit input-power-factor when it is grid
Results: The paper studies the dynamic characteristics of the system in which the virtual-damping is
applied, derives the augmented state feedback control equations and transfer functions, gets the
optimized control parameters and more feasible closed-loop ac nodes, to enhance the stability of the
Conclusion: The experiment results, which are involved in the source-side features, grid-tired process
of MC, and load change response, show that the MC grid-tied system based on the new strategy has
favorable features and unit-power-factor in both source and grid sides.