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<p>Single-phase grid-connected AC-DC converters often face the challenge of power mismatch, which can be addressed using either active or passive energy storage elements. Passive solutions, such as C-filters or LC-filters, are commonly employed but tend to be bulky and occupy significant space on PCB. Among active energy storage options, the series-stacked buffer (SSB) has gained attention for its superior power density and high energy utilization efficiency. However, SSBs have a notable drawback: they require a higher number of sensors compared to other advanced active energy storage solutions. To overcome this limitation and enable current-sensorless control, this paper introduces an adaptive non-linear current observer (ANCO)-based control approach for SSBs, eliminating the need for additional current sensors. The proposed ANCO-based control method avoids differential operations while effectively rejecting disturbances caused by parameter mismatches. Furthermore, the inherent noise-filtering capability of ANCO ensures reliable performance of the SSB. To enhance dynamic response, a voltage feedforward technique is also incorporated. Effectiveness of the proposed ANCO-based control strategy is demonstrated through its application to an SSB integrated with a 1 kW single-phase AC-DC converter, validating its feasibility and performance.</p>

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Adaptive Non-linear Observer Based Current-Sensorless Operation of Series-Stacked Buffer

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Muhammad Zarkab Farooqi,
  • Bhim Singh,
  • Bijaya Ketan Panigrahi

摘要

Single-phase grid-connected AC-DC converters often face the challenge of power mismatch, which can be addressed using either active or passive energy storage elements. Passive solutions, such as C-filters or LC-filters, are commonly employed but tend to be bulky and occupy significant space on PCB. Among active energy storage options, the series-stacked buffer (SSB) has gained attention for its superior power density and high energy utilization efficiency. However, SSBs have a notable drawback: they require a higher number of sensors compared to other advanced active energy storage solutions. To overcome this limitation and enable current-sensorless control, this paper introduces an adaptive non-linear current observer (ANCO)-based control approach for SSBs, eliminating the need for additional current sensors. The proposed ANCO-based control method avoids differential operations while effectively rejecting disturbances caused by parameter mismatches. Furthermore, the inherent noise-filtering capability of ANCO ensures reliable performance of the SSB. To enhance dynamic response, a voltage feedforward technique is also incorporated. Effectiveness of the proposed ANCO-based control strategy is demonstrated through its application to an SSB integrated with a 1 kW single-phase AC-DC converter, validating its feasibility and performance.