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基于复合自适应的Buck变换器预设性能控制

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针对Buck型变换器在复杂环境下发生负载波动时输出电压受扰的问题,提出了一种复合自适应预设性能控制方案以提升其控制效果.首先,利用自适应律对模型中包含负载项的非线性函数进行预测估计,同时通过在自适应律更新过程中构建并行估计模型获取预测误差,并将预测误差和跟踪误差融合以设计自适应参数更新律.然后,采用广义比例积分观测器来对剩余不确定性和外部扰动进行估计,并在控制律中进行补偿.最后,结合指令滤波反步控制和指定时间预设性能控制技术,提出了 Buck型变换器复合自适应预设性能控制方案.所提出的方案保证了对负载波动的高精度预测,避免了在突发情况下输出电压超出预设函数范围,此外还证明了闭环控制系统中的信号收敛性.实验结果表明,复合自适应预设性能控制在负载突然减小的情况下系统最大偏离电压为0.376 V,相比于传统自适应反步控制的1.773 V减少了 78.7％,验证了所提方案的有效性以及优越性.
Composite adaptive prescribed performance control for Buck converters
To address the issue of output voltage disturbance in Buck converters under complex environments with load fluctuations,a composite adaptive prescribed performance control scheme is proposed to enhance control effectiveness.Initially,an adaptive law is utilized to predict and estimate the nonlinear function containing the load term within the model.Concurrently,a parallel estimation model is constructed during the adaptive law update process to acquire prediction errors,which are then integrated with tracking errors to design an adaptive parameter update law.Subsequently,a generalized proportional-integral observer is employed to estimate the remaining uncertainties and external disturbances,which are compensated for within the control law.Finally,combining command-filtering backstepping control and specified-time prescribed performance control techniques,a composite adaptive prescribed performance control scheme for Buck converters is proposed.The presented scheme ensures high-precision prediction of load fluctuations,preventing output voltage from exceeding the prescribed function range during sudden events,and also demonstrates the signal convergence within the closed-loop control system.Experimental results indicate that the composite adaptive prescribed performance control,when faced with a sudden reduction in load,limits the system's maximum voltage deviation to 0.376 V,a 78.7％decrease compared to the traditional adaptive backstepping control's 1.773 V,thereby validating the effectiveness and superiority of the proposed scheme.

Buck converteradaptive controlbacksteppingnonlinear controlprescribed performance controlcommand filter

张逸、孙金林、丁世宏、常亚菲、邢高勇

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江苏大学电气信息工程学院 镇江 212013

北京控制工程研究所 北京 100190

中国农业大学工学院 北京 100083

农业装备技术全国重点实验室 北京 100083

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Buck型变换器 自适应控制 反步法 非线性控制 预设性能控制 指令滤波

国家重点研发计划江苏省自然科学基金国家自然科学基金国家自然科学基金江苏大学高级人才基金项目省部共建现代农业装备与技术协同创新中心

2022YFD200150203BK20220518622031896200303422JDG044XTCX2015

2024

10.13382/j.jemi.B2307015

电子测量与仪器学报
中国电子学会

电子测量与仪器学报

CSTPCD北大核心
影响因子：2.52
ISSN：1000-7105
年,卷(期)：2024.38(4)