固态变压器中隔离级DC/DC变换器的输出电压易受前级上网三相变换器电压波动或负载突变的影响,进而威胁固态变压器直流母线电压的稳定性。针对这一问题,该文提出一种基于双积分滑模控制的固态变压器电压控制策略。首先,对前级三相全控整流器实施电压电流双闭环控制,并基于傅里叶级数构建隔离级双向DC/DC变换器的移相控制统一模型。其次,通过单移相控制模式验证模型,结合双积分滑模控制理论设计控制器。仿真与实验结果表明,与传统PI控制和单积分滑模控制相比,所提方法在动态响应速度、超调抑制能力及负载突变下的电压稳定性方面均表现出显著优势,鲁棒性显著增强。
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.
关键词
固态变压器 /
隔离双向DC/DC变换器 /
滑模控制 /
电压控制 /
统一模型 /
三相全控整流
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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基金
国家自然科学基金（52377185）; 湖南省电力公司科技项目（5216M0240006）
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