Randomized carrier modulation for four-leg matrix converter based on optimal Markov chain

In order to reject the voltage disturbance of matrix converterpsilas output side from nonlinear loads and improve the comprehensive performance of power converter system, this paper presents a randomized carried modulation strategy based on Markov chain for four-leg matrix converter. It is an optimal randomized carried modulation strategy taking the random transient matrix as variables, and taking the output voltage waveform quality, switching count and electro-magnetic interference level as optimized objectives. An approximate formulation is used due to the complexity of performance indicatorpsilas analytical description. This method, on the one hand, is able to reflect the real performance of the system; on the other hand, it simplifies the optimization problem. This modulation strategy has many advantages such as less computation burden and easier realization compared with three-dimensional space vector modulation. Both Simulations and experimental results verify the feasibility of the proposed method.