Abstract
In this paper, a modulation strategy of a 3 × 5 modular multilevel matrix converter (M3C) is proposed. The circuit of 3 × 5 M3C is firstly introduced. Then, operation rules of 3 × 5 M3C are illustrated, and a connection pattern of branches is determined based on these rules. Different voltage states in the input and output side can be achieved by different connection patterns. These voltage states are represented in the form of vector. It is hard to synthesize five-phase output with the three-level synthesis method. Therefore, the five-level synthesis method is adopted in this paper; i.e., is the branch states have been increased. Ten effective vectors and a zero vector are selected based on the five-level synthesis method. With this modulation strategy, we achieve output line-to-line voltages that are in line with the trend of a sine wave. The segment division and duty cycle calculation are very simple, and the modulation strategy can be implemented easily. The simulation model of 3 × 5 M3C is constructed based on Matlab/Simulink, and the corresponding experimental platform is set up. The results of simulation and experiment show that the proposed method is reasonable and correct.
Highlights
More and more attention has been paid to the research on a multiphase AC drive system
Compared with the three-phase motor, the multi-phase motor system has the advantages of small torque fluctuation, high power density, high efficiency, fault tolerant operation and low voltage high power, etc
Take the output side reference vector Vout, on the input side refers to the traditional three-phase synthesis method mentioned in [17], and the which is located in the sector 2 shown in Figure 4, as an example
Summary
More and more attention has been paid to the research on a multiphase AC drive system. M3C has some other advantages such as full modularity, simple extension to high voltage levels, control flexibility, better harmonic quality and redundancy, and the fact that several failed modules do not necessarily cause system shutdown [11,12,13] These unique advantages make it very suitable for high-power low-speed motor drives and high-power wind energy conversion systems [11,14,15]. For the three-phase M3C, the conversion can be realized by only one H-bridge cell in the effective state in a working arm branch as in [16] In this case, the output line voltage is three-level. 1, seven branch connections are required to synthesize the input/output states, namely,There.
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