【目的】面向单向供电型无线电能传输(WPT)系统对接收端结构简化、低成本实现、高可靠运行及负载侧快速稳压的应用需求,本文针对LCC-S型WPT系统在线圈偏移、负载变化及整流侧输入扰动条件下副边输出稳定性下降的问题,提出粒子群优化线性自抗扰控制(PSO-LADRC)策略,以改善系统动态与抗扰性能。【方法】本文基于LCC-S型WPT系统传输特性,建立副边Buck变换器小信号模型,构建包含线性扩张状态观测器和线性状态误差反馈控制律的副边闭环控制器,实现总扰动的在线估计与补偿;通过构建多性能指标目标函数,采用PSO优化LADRC关键参数,提升系统综合控制性能。【结果】试验表明,在0、2 cm和5 cm线圈偏移下,输出电压均可稳定在20 V附近;参考电压由20 V突变至15 V时,PSO-LADRC调节时间为2 ms,仅为传统LADRC的1/3;负载由15 Ω切换至30 Ω时,调节时间由1.0 ms缩短至0.8 ms,超调量由2.2%降低至1.9%。【结论】本文提出的PSO-LADRC策略有效解决了LCC-S型WPT系统副边Buck变换器输出电压波动、鲁棒性较差的问题,为高性能WPT系统的工程应用提供了技术支撑。

[Objective] To address the application requirements of unidirectional wireless power transfer (WPT) systems—including simplified receiver-side structure, cost-effective implementation, reliable operation, and fast load-side voltage stabilization—this study targets the decline in output stability of LCC-S WPT systems under coil misalignment, load variations, and rectifier-side input disturbances. A particle swarm optimization-based linear active disturbance rejection control (PSO-LADRC) strategy is proposed to enhance dynamic and anti-disturbance performance. [Methods] Based on the transmission characteristics of the LCC-S WPT system, a small-signal model of the secondary-side Buck converter was established. A secondary-side closed-loop controller comprising a linear extended state observer and a linear state error feedback law was constructed to realize the online estimation and compensation of the total disturbance. Furthermore, a multi-performance index objective function was formulated, and PSO was employed to optimize the key parameters of LADRC, thereby enhancing the overall control performance of the system. [Results] Experiments indicated that the output voltage was stabilized around 20 V under coil misalignments of 0, 2 cm, and 5 cm. When the reference voltage was stepped from 20 V to 15 V, the settling time of PSO-LADRC was 2 ms, which was only one-third of that of conventional LADRC. During the load step change from 15 Ω to 30 Ω, the settling time was reduced from 1.0 ms to 0.8 ms, and the overshoot was decreased from 2.2% to 1.9%. [Conclusion] The proposed PSO-LADRC strategy in this paper effectively addresses the issues of output voltage fluctuation and poor robustness in the secondary-side Buck converter of the LCC-S WPT system, providing technical support for the engineering application of high-performance WPT systems.

国家自然科学基金(52302454)