固态变压器整流级的滑模自抗扰设计与仿真

SLIDING MODE ACTIVE DISTURBANCE REJECTION DESIGN AND SIMULATION FOR RECTIFIER STAGE OF SOLID STATE TRANSFORMER

固态变压器是能源路由器实现电能变换的核心设备。分布式发电单元常处于多变量、强耦合、未知扰动剧烈,影响系统的稳定运行。设计一种基于改进型线性扩张状态观测器(LESO)的滑模自抗扰控制器应用于固态变压器整流级的电压外环,对传统的LESO引入新的误差来对各个状态变量进行调节,提高LESO的观测精度。利用改进型LESO观测到的状态变量用于滑模控制器(SMC)中进行前馈补偿调节,减少扰动对直流母线电压产生的随机波动。通过仿真平台对系统进行验证,结果表明基于改进型LESO的滑模自抗扰控制器对系统的动态性能和并网质量有明显的改善。

Solid-state transformer(SST)is the core equipment of energy router to realize energy conversion.As distributed generation units are often in multivariable,strong coupling and violent unknown disturbance,the stable operation of the system is severely challenged.In order to solve this problem,a sliding mode active disturbance rejection controller based on improved linear extended state observer(LESO)is designed and applied to the voltage outer loop of the rectifier stage of solid-state transformer.New errors were introduced to the traditional LESO to adjust various state variables,and the observation accuracy of LESO was improved.The state variables observed by the improved LESO were used in sliding mode controller(SMC)for feedforward compensation adjustment to reduce the random fluctuation of DC bus voltage caused by disturbance.The system was verified by the simulation platform.The results show that the sliding mode ADRC based on the improved LESO can obviously improve the dynamic performance and grid-connected quality of the system.