一种双级变换器储能并网结构的新型模型预测法

摘要

针对储能并网系统中采用的双级变换器结构，论文提出一种新型模型预测控制方法。该方法在保证并网功率恒定和直流链电容电压稳定基础上，对直流链电容中流通电流建立了相应的价值函数。新型模型预测控制方法能够有效降低直流链电容中流通电流的大小，对电容使用寿命的提高有很大帮助。最后对文中所提出的新型模型预测控制方法进行了仿真和实验验证，结果表明该算法能够有效减小直流链电容中流通电流的大小。%This paper proposed a novel model predictive control ( MPC ) method for two-stage converter applied in grid-tied storage system .Besides the demand of rated output power and constant dc-link voltage , a cost function is built for the current through the dc-link capacitor .With the proposed method applied , the RMS value of dc-link cur-rent is reduced effectively , which extends the life cycle of dc-link capacitor .Finally , the proposed novel MPC method was simulated by MATLAB/SIMULINK.The experimental results show that a scaled-down prototype was built for the performance verification of the proposed MPC method .