Abstract
This article improves the robustness of a finite control set (FCS)-model predictive controller (MPC) for grid-tied inverters and motor drives applications to plant parameter variations and noise, without reducing its bandwidth or affecting its excellent transient response to disturbances and reference commands. The proposed modification adds an observer to the MPC controller structure, which does not significantly increase the computational burden on the embedded controller. Traditionally, observers are employed to estimate unmeasured variables and cancel the effect of disturbances, but this article employs the observer to estimate a measured variable, the converter output current. This solution leverages the benefits of observers from linear controller theory in order to remove undesired components in the measured current and improve the robustness of the controller; hence it is a valuable solution for practicing power-electronic engineers and researchers in the field of grid-tied inverters and motor drives due to its simplicity compared to some advanced techniques often required in more complex MPC designs.
Highlights
In power electronic applications, model predictive controllers (MPCs) are growing in popularity thanks to an increasing computational capability in embedded controllers and an enormous research effort throughout the last two decades [1], [2]
The experimental results are carried out in a 5-kW voltage source converter (VSC) working as an inverter with a 700-V dc bus vdc and connected to a 400-V line-to-line 50-Hz three-phase grid
By adding the required external voltage and current sensors, this platform is able to record in the same time base, i.e. simultaneously, the three-phase grid voltages, the three-phase grid currents, and signals internal to the controller such as the grid-current in the dq frame or the grid current estimation provided by the observer
Summary
Model predictive controllers (MPCs) are growing in popularity thanks to an increasing computational capability in embedded controllers and an enormous research effort throughout the last two decades [1], [2]. A FCS-MPC directly selects a switching state and maintains it during a whole sampling period whereas a CCS-MPC uses a pulse width modulator (PWM) to generate the firing signals that drive the power converter. The former design is more popular among researchers in the field of power conversion [3] and it is the type of MPC considered in this article
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