基于非线性非仿射模型的直流微电网电压控制方法

Voltage Control for DC Microgrid Based on Nonlinear Non-affine Model

提出了由光伏、储能、恒电阻负载和恒功率负载组成的直流微电网新型电压调节和最大功率点跟踪控制方法。该方法建立了具有非仿射输入的多输入多输出非线性直流微电网系统的动态模型。在此非线性动态模型的基础上,利用输出调节理论设计了局部状态反馈控制器,通过调节电压来规定设定值,使光伏功率输出达到最大。利用无源系统理论和李雅普诺夫稳定性理论研究了非仿射系统的全局设定点调节问题。在光照和负载同时发生变化的情况下,通过仿真验证了所提控制方案的有效性。

A novel voltage regulation and maximum power point tracking(MPPT)control for DC microgrid composed of PV panel,battery,constant resistance and constant power loads was proposed.A dynamic model of the DC microgrid system described by a multi-input and multi-output nonlinear system with non-affine inputs was derived.Based on this nonlinear dynamic model,a local state feedback controller was designed used output regulation theory,which can regulate voltages to prescribe set points and maximize PV power output.The global set point regulation of non-affine systems was also studied by using passive system theory and Lyapunov stability theory.The effectiveness of the proposed control schemes was investigated using simulations when changes in both illumination and load.