储能交错并联双向DC-DC变换器的自抗扰控制
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陕西理工大学电气工程学院 汉中 723001

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TM46;TN386

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陕西省自然科学研究项目(2023-JC-YB-442)资助


Active disturbance rejection control of energy storage interleaved parallel bidirectional DC-DC converter
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School of Electrical Engineering, Shaanxi University of Technology,Hanzhong 723001, China

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    摘要:

    针对直流微电网系统中三相交错并联双向DC-DC变换器受不确定性扰动影响的问题,设计一种双闭环线性自抗扰控制策略。首先,建立双向DC-DC数学模型,通过小信号分析法推导出变换器的传递函数。其次,设计电流环为二阶线性自抗扰,电压环为一阶线性自抗扰的双闭环系统,通过设计其对应的线性扩张状态观测器和线性状态误差反馈控制律,实时估计并补偿外部干扰及系统内部不确定因素。最后,根据林纳德-奇帕特稳定判据证明控制系统的稳定性,并在MATLAB/Simulink中对3种控制策略在不同工况下进行仿真对比验证。仿真结果表明,与传统比例积分控制器相比,本文所提控制策略在储能侧电压突增、突减20%的扰动下,母线电压最大动态偏差比分别优化0.5%和0.97%且调节时间缩短78.3%和76.9%;在负载突增、突减20%的扰动下,母线电压最大动态偏差比分别优化0.79%和1.5%且调节时间缩短72%,在保证各相均流的前提下有效提高系统的动态性能和抗扰能力。

    Abstract:

    A double-closed-loop linear self-resistant control strategy is designed to solve the problem of the three-phase staggered-parallel bi-directional DC-DC converter affected by uncertainty perturbations in the DC microgrid systems. Firstly, a bidirectional DC-DC mathematical model is established, and the transfer function of the converter is derived by small-signal analysis. Secondly, a double closed-loop system with second-order LADRC in the current loop and first-order LADRC in the voltage loop is designed to estimate and compensate for the external disturbances and the internal uncertainties of the system in real time by designing its corresponding linear extended state observers and linear state error feedback. Finally, the stability of the control system is proved according to the Lienard-Chipard stability criterion, and the three control strategies are simulated in MATLAB/Simulink for comparison and verification under different operating conditions. The simulation results show that, compared with the traditional proportional-integral controller, the control strategy proposed optimizes the maximum dynamic deviation ratio of the bus voltage by 0.5% and 0.97% and shortens the regulation time by 78.3% and 76.9% under the disturbances of 20% voltage increase and decrease on the energy storage side, and optimizes the maximum dynamic deviation ratio of bus voltage by 0.79% and 1.5% and shortens the regulation time by 72% under the disturbances of 20% load increase and decrease, which effectively improves the dynamic performance and anti-disturbance capability of the system under the premise of ensuring the equal flow of each phase.

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马帅旗,任思嘉,贺海育,张力蕾,赵佳瑶.储能交错并联双向DC-DC变换器的自抗扰控制[J].电子测量技术,2024,47(13):35-44

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  • 在线发布日期: 2024-11-07
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