Abstract
This paper proposes a novel model predictive current control scheme for two-stage matrix converter. The switching frequency is kept constant by fixing the switching instant. The control strategy achieves to control source reactive power in the input side and output currents in the output side. In addition, the advantage of the proposed strategy compared with conventional model predictive control is firstly proved using the principle of vector synthesis and the law of sines in the vector distribution area. Moreover, a zero-current switching sequence is proposed and implemented to insure zero-current switching operations and reduce the switching losses. Furthermore, in order to suppress the input filter resonance, which is easier to be inspired by the model predictive control, compared with traditional control strategies, an innovative active damping technique is proposed and implemented. Finally, both simulation and experiment are implemented to verify the performance of the proposed strategy. The results demonstrate that the control system features both good steady and transient performance.
Highlights
Matrix converters (MC) can offer direct AC–AC power conversion with no use of DC-link capacitors and have often been studied as an alternative to the traditional power topologies [1,2]
Due to the lack of modulation schemes, the conventional model predictive control (MPC) (CMPC) optimizes and applies only one optimal switching state in the sampling period; the selected one optimal switching state probably leads to the minimum errors in more than one sampling periods, which results in a variable switching frequency and produces a broad harmonic spectrum [18]
The input filter resonance is easier to be inspired by the model predictive control, when compared with traditional control methods, leading to highly distorted line-side currents, which are reflected in the load side because of the direct topology [26,27,28,29,30,31,32,33]
Summary
Matrix converters (MC) can offer direct AC–AC power conversion with no use of DC-link capacitors and have often been studied as an alternative to the traditional power topologies [1,2]. The input filter resonance is easier to be inspired by the model predictive control, when compared with traditional control methods, leading to highly distorted line-side currents, which are reflected in the load side because of the direct topology [26,27,28,29,30,31,32,33]. In [31,32,33], digital dc blockers are still applied to filter the capacitor voltages, even when the source voltages and source currents are available, which worsen the dynamic performance and even could limit the range of parameter adjustment To solve these problems above, this paper proposes a novel model predictive control scheme for the TSMC. A vector modulation-based model predictive current control (VMMPCC) strategy is proposed, which features the controllable source reactive power and the controllable output currents with fixed switching frequency output waveforms. A novel input filter resonance suppression (IFRS) method is proposed and applied in the VMMPCC for the TSMC, featuring good damping performance and easy implementation
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