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Operational boundary expansion and third-order harmonic suppression control for single-phase GFM-ECHB
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DOI：10.1016/j.epsr.2026.113012.png)
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Abstract
En 中文
For single-phase grid-forming enhanced CHB (GFM-ECHB) convertors, an increase in output active power and inductive reactive power leads to a higher modulation ratio, resulting in the degradation of grid-connection current. Although traditional harmonic suppression strategies can address similar issues, this article shows that they also affect the control stability of GFM-ECHB via small-signal perturbation modeling and pole distribution analysis. Moreover, this effect cannot be mitigated through independent power regulation of SMs. To address this issue, an optimized third-order harmonic injection (OTOI) strategy is proposed. It involves injecting third harmonics into each SM using an interleaved harmonic voltage injection method, while simultaneously employing a harmonic current suppression strategy to eliminate third harmonics, which a single-phase topology can't naturally cancel. Ultimately, without reducing power output, all SMs remain undermodulated, effectively suppressing the third-harmonic component of the output current. Both simulation and hardware experiments validated the effectiveness of OTOI.
Keywords:
Cascaded H-bridge (CHB)
Grid-forming convertor
Third harmonics
Pole distribution
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4.2
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1.1W
Citations:
2.2W
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