Abstract
The existing model predictive control schemes for the matrix converter perform well under ideal input conditions, but are not optimal when source voltages are unbalanced and distorted. The analysis shows that, under input disturbances, the input filter capacitors cause active power fluctuation and further output power quality degradation, which has been ignored in literature. Therefore, a method is proposed to extract the fluctuation with a digital filter and compensate it in the reference generation of source active power, so as to eliminate the output low-frequency harmonics. In the case of input voltage unbalance, a method is proposed to generate the reference source reactive power which could achieve sinusoidal source currents, without the need of separating sequence components. Moreover, effects of source voltage distortions, which degrade the input power quality significantly and are ignored in literature, are suppressed with the proposed generation method of reference reactive power. The extensive experimental results in nine cases have verified the satisfactory steady-state and dynamic performance of the proposed methods.
Highlights
Matrix converter (MC) realizes direct power conversion between two multi-phase systems without large DC-link energy storage elements [1]
Considering source voltage unbalance and distortions, the analysis in this paper shows that the input filter capacitors generate active power fluctuation transferred to the load by the MC
High-performance digital filter which is easy to implement is adopted in the proposed method so as to eliminate the unwanted harmonics in the additional control signal without affecting the wanted ones
Summary
Matrix converter (MC) realizes direct power conversion between two multi-phase systems without large DC-link energy storage elements [1]. In [21] and [22], similar methods are proposed for the MC with MPC, which are based on the extendedstate observer and lagging signals by 90◦ respectively All of these methods have ignored the effect of source voltage distortions which degrade the control performance significantly. Considering both the source voltage unbalance and distortions, improvements are proposed for the MC with MPC in this paper, which are realized by setting appropriate reference of source active and reactive power. A digital filter is adopted in the proposed method to extract the fluctuation and compensate it in the reference of source active power, so that balanced and sinusoidal output currents under any input disturbances can be achieved.
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