| 引用本文: | 孙曙光,徐永海,袁 敞,等.基于解耦模型预测控制的三相交错并联三电平DC-DC变换器均流控制策略[J].电力系统保护与控制,2025,53(14):13-26. |
| SUN Shuguang,XU Yonghai,YUAN Chang,et al.Current sharing control strategy for three-phase interleaved three-level DC-DC converters based on decoupled model predictive control[J].Power System Protection and Control,2025,53(14):13-26 |
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| 摘要: |
| 针对三相交错并联三电平DC-DC变换器相间电流易受参数失配影响而不均衡的问题，提出一种基于解耦模型预测控制的均流控制策略。基于虚拟电压源对变换器进行拓扑等效，建立了变换器的平均状态方程。在此基础上，引入扩张状态观测器补偿相间电流差值中的耦合扰动，并基于控制环路的解耦关系提出一种具有间接控制变量与归一化代价函数的解耦模型预测控制。所提均流控制策略通过多控制环节的独立寻优，在实现变换器相间均流的同时可兼顾输入电压均压与平均输出电流跟踪的控制目标。同时，对解耦电流内环进行降阶等效，简化电压外环控制参数设计。最后，通过实验验证了所提均流控制策略的有效性。 |
| 关键词: 三相交错并联三电平DC-DC变换器 均流 扩张状态观测器 解耦模型预测控制 降阶等效 |
| DOI：10.19783/j.cnki.pspc.240753 |
| 分类号: |
| 基金项目:国家重点研发计划项目资助(2021YFB2601403) |
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| Current sharing control strategy for three-phase interleaved three-level DC-DC converters based on decoupled model predictive control |
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SUN Shuguang, XU Yonghai, YUAN Chang, SONG Xinyi, CHEN Yiwei
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School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China
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| Abstract: |
| A current sharing control strategy based on decoupled model predictive control (MPC) is proposed to address the issue of unbalanced phase current in three-phase interleaved parallel three-level DC-DC converters caused by parameter mismatches. Based on the topological equivalence of the converter using a virtual voltage source, the average state equation of the converter is established. An extended state observer is introduced to compensate for the coupling disturbance in the inter-phase current differences. Based on the decoupled nature of the control loops, a decoupled MPC approach with indirect control variables and normalized cost function is proposed. The proposed current sharing control strategy can take into account the control objectives of input voltage sharing and average output current tracking while realizing the inter-phase current sharing of the converter through independent optimization of multiple control links. Furthermore, the reduced-order equivalence of the decoupled inner current loop simplifies the design of the outer voltage loop control parameters. Finally, the effectiveness of the proposed current sharing control strategy is verified through experiments. |
| Key words: three-phase interleaved parallel three-level DC-DC converter current sharing extended state observer decoupled model predictive control reduced-order equivalence |
