基于新能源建筑照明系统的DC/DC变换器改进滑模控制

Improved Sliding Mode Control of DC/DC Converter Based on New Energy Building Lighting System

针对以光伏、风电为利用能源的新能源建筑照明系统中的电能传输环节在环境干扰、系统内部结构参数摄动等因素的影响下出现的照明系统稳定性不足、亮度呈现波动等问题,设计了一种基于线性扩张状态观测器和滑模控制相结合的改进滑模控制策略。根据新能源建筑照明系统的架构图,建立传输环节的拓扑结构,并根据电压电流定律得出传输环节的数学方程,引入线性状态观测器,对系统中的各类扰动进行统一估测。同时在观测器的反馈控制环路中引入滑模控制,对扰动估测量进行实时抵消,提升对外界扰动和系统内扰的估测精度,提高了系统在各类扰动下的稳定运行能力。最后,在MATLAB/Simulink数字实验平台中搭建以新能源建筑照明系统为主体模型,以改进滑模控制为主要策略的实验模型,模拟多种工况进行实验。结果显示所提出的改进滑模控制改善了系统在各类扰动下的抗扰性和鲁棒性,保证了系统在暂态和稳态下的安全运行能力。

A improved sliding mode control strategy based on a combination of linear expansion state observer and sliding mode control is designed to address the issues of insufficient stability and brightness fluctuations in the power transmission process of new energy building lighting systems utilizing photovoltaic and wind power,which are affected by environmental disturbances and internal structural parameter perturbations.Based on the architecture diagram of the new energy building lighting system,establish the topology structure of the transmission link,and derive the mathematical equation of the transmission link according to the voltage and current law.Introduce a linear state observer to uniformly estimate various disturbances in the system.At the same time,introduce sliding mode control in the feedback control loop of the observer to real-time cancel out the disturbance estimation measurement,improve the estimation accuracy of external and internal disturbances,and improve the stable operation ability of the system under various disturbances.Finally,an experimental model with the new energy building lighting system as the main model and improved sliding mode control as the main strategy was built on the MATLAB/Simulink digital experimental platform.Multiple operating conditions were simulated for experiments,and the results showed that the proposed improved sliding mode control improved the system’s anti-interference and robustness under various disturbances,ensuring the safe operation ability of the system in transient and steady-state conditions.