基于无源综合控制的独立光伏发电系统

Stand-Alone Photovoltaic System Based on Passivity Hybrid Control

针对独立光伏发电系统含有的单向Boost和双向Buck-Boost DC/DC变换器具有本质的非线性,对该DC/DC变换器采用无源控制非线性控制,结合PI控制的综合控制方法。为了实现对蓄电池采用限流充电和恒压充电两阶段充电方式,兼顾对直流母线电压进行有效控制,对两类DC/DC变换器分别采取两种模式的控制方式,并对Boost变换器进行无源电流控制设计和对Buck变换器进行无源电压设计。最后,仿真验证证明了所提控制策略对独立光伏发电系统能量管理的有效性。

Aimming at the essential nonlinearity of unidirectional Boost converter and bidirectional Buck-Boost converter,DC/DC converters in Stand-alone Photovoltaic System,DC/DC converters were controlled by nonlinear control method of passivity-based control,and combined with PI control of hybrid control.In order to incorporate two-stage battery charging method,current-limitted charging and constant voltage charging,with effective control for DC bus voltage,two control modes were employed for above DC/DC converters and for Boost converter and Buck converter,and passivitybased control for current regulation and passivity-based control for voltage regulation were designed.Finally,the simulation results show that the effectiveness of control method is proposed for stand-alone photovohaic system energy management.