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Sequence Pulse Modulation Strategy for Voltage Balance Based on Single-Phase Three-Level Neutral Point Clamped Cascaded Rectifier

In this article, a sequence pulse modulation (SPM) strategy is proposed to solve the problem that the DC voltage is imbalance among the modules of single-phase three-level Neutral Point Clamped Cascaded Rectifier (3LNPC-CR). The modulation achieves the DC side voltage balance of each module through three steps: (1) Phase disposition calculation; (2) SPM generator; (3) Rank function. In addition, this modulation also avoids the phenomenon of “voltage level jumping” on the grid side, which can effectively reduce the frequency of the switch. The correctness of the proposed modulation is verified by simulation and experiments.