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Abstract
A matrix converter (MC) with model predictive control based on the source reactive power control usually fails to show sinusoidal source currents. The analysis presented in this paper shows that this common combination of a converter and control has the inherent inability to suppress some harmonics in the source currents, even with additional passive or active damping control. Direct source current control can be implemented to give sinusoidal source currents and intrinsic active damping. However, the issue of steady-state error in output currents then arises, as the MC topology does not allow of the independent control of source and output currents. Therefore, feedback control of load active power is proposed to address this issue without degrading the fast dynamic performance. Benefiting from the direct source current control, a simplified implementation is also proposed to decrease the number of candidate switching states from 27 to 5, which significantly reduces the computational burden. Experimental results have verified the theoretical analysis and the effectiveness of the proposed control scheme.
Highlights
In recent years, model predictive control (MPC) has been suggested as a promising alternative to linear modulation algorithms [3], [6]
The source current isA is highly distorted with the total harmonic distortion (THD) up to 7.82%
The results prove that the direct source current control could achieve high input and output power quality and has the intrinsic active damping function
Summary
Model predictive control (MPC) has been suggested as a promising alternative to linear modulation algorithms [3], [6]. The concept of “nearest vectors” was proposed in [27] to reduce the number of candidate switching states for MPC The idea of this simplification has been applied to various converters controlled by MPC [28]-[31], including the MC with the traditional MPC scheme [15]. This paper firstly presents an explanation of why the traditional MPC with source reactive power control and output current control cannot obtain sinusoidal source currents. A feedback control method is proposed to suppress the steady-state error of the direct source current control, which is based on regulating the load active power.
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