基于风能和太阳能互补的微电网建模与仿真分析

根据光伏电池的数学模型在MATLAB上建立了仿真模块,同时利用MATLAB里已有的异步风力发电机模型及蓄电池模型构建了风光互补的微电网系统。采用直流微电网与交流微电网混合的方式对直流负荷和交流负荷供电,在交流侧,仅采用一个独立的公共DC/AC变换器,在满足了负荷需求的同时节约了变换器资源。针对微电网的并网运行模式,建立了PQ控制模型;针对微电网的孤岛运行模式,采用了V/f控制方法,在电感电流内环电压外环的基础上,加入了负载扰动前馈补偿,同时,对逆变器连续状态空间表达式进行离散化,建立了控制模型。最后,通过对微电网并网运行和孤岛运行时的实例仿真,验证了控制方法的可行性及有效性。

Modeling and simulation analysis of micro-grid based on wind and solar energy complementation

According to the PV mathematical model,a model was established on MATLAB.A system of micro-gird based on wind and solar energy complementation was established by using existed asynchronous wind generator model and battery model in MATLAB.DC micro-grid and AC micro-grid hybrid was adopted.An independent public DC/AC converter in AC side.Not only the load demand was satisfied,but also the converter resources were saved.PQ control model was established based on grid-connected model.And in isolated mode,the converter was working in V/f control.Based on an inductor current inner loop control voltage outer loop control,the feed-forward compensation of load disturbances was added.Meanwhile the discretization of continuous state space expression was made,the control model was established.The feasibility and effectiveness of control model was verfied by the simulation example.