VOLTAGE CONTROL STRATEGY OF SOLID-STATE TRANSFORMERS BASED ON DOUBLE-INTEGRAL SLIDING MODE CONTROL

Cao Feng; Tan Youqi; Zeng Jinhui; Liu Renshan

doi:10.19912/j.0254-0096.tynxb.2025-0465

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (7) : 773-780. DOI: 10.19912/j.0254-0096.tynxb.2025-0465

VOLTAGE CONTROL STRATEGY OF SOLID-STATE TRANSFORMERS BASED ON DOUBLE-INTEGRAL SLIDING MODE CONTROL

Cao Feng¹, Tan Youqi², Zeng Jinhui¹, Liu Renshan²

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Abstract

In solid-state transformers, the output voltage of the isolated DC/DC converter stage is susceptible to voltage fluctuations from the front-stage grid-connected three-phase converter or load transients, thereby threatening the stability of the DC bus voltage in the solid-state transformer. To address this issue, this paper proposes a voltage control strategy for solid-state transformers based on dual-integral sliding mode control. First, a dual closed-loop voltage-current control is implemented for the front-stage three-phase fully-controlled rectifier, and a unified phase-shift control model for the isolated bidirectional DC/DC converter is established based on Fourier series analysis. Subsequently, the model is validated under single-phase-shift control mode, and a controller is designed by integrating dual-integral sliding mode control theory. Simulation and experimental results demonstrate that, compared to traditional PI control and single-integral sliding mode control, the proposed method exhibits significant advantages in dynamic response speed, overshoot suppression capability, voltage stability under load transients, and substantially enhanced robustness.

Key words

solid-state transformer / isolated bidirectional DC/DC converter / sliding mode control / voltage control / unified model / three-phase fully-controlled rectifier

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Cao Feng, Tan Youqi, Zeng Jinhui, Liu Renshan. VOLTAGE CONTROL STRATEGY OF SOLID-STATE TRANSFORMERS BASED ON DOUBLE-INTEGRAL SLIDING MODE CONTROL[J]. Acta Energiae Solaris Sinica. 2026, 47(7): 773-780 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0465

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