基于无源性理论的光伏储能型准Z源并网逆变器控制方法研究

储能型准Z源逆变器（qZSI）在光伏发电中具有突出优势，有助于减少光伏发电系统中的功率波动。为解决比例微分（PI）控制响应速度慢、超调量大、控制参数多且不易确定等问题，提出储能型qZSI的非线性无源控制方法。首先，对储能型qZSI无源控制系统进行无源性和稳定性证明；然后，依据储能型准Z源的E-L模型，设计无源控制器；最后，通过Matlab/Simulink验证了在光伏光照变化及网侧功率变化时，采用无源控制方法的优越性。与PI控制器对比，设计的无源控制器响应速度更快、控制参数更少，实现了对系统的鲁棒性控制，获得了更好的动态性能。

Control Method of Photovoltaic Energy Storage Quasi-Z-source Grid-connected Inverter Based on Passive Theory

Energy storage quasi-Z-source inverter（qZSI）has prominent advantages in photovoltaic power generation， helping to reduce power fluctuation in the photovoltaic power generation system. In order to solve the problems in proportion integration such as slow response speed，large overshoot，many control parameters and difficulty to determine，the paper proposes a nonlinear passive control method of the energy storage qZSI. Firstly， the passivity and stability of the qZSI passive control system are proved. Then a passive controller is designed according to the E—L model of the energy storage quasi-z-source. Finally， the advantage of the passive control method is verified when photovoltaic illumination changes and grid side power changes through MATLAB/Simulink. Compared with PI Controller，the designed passive controller has faster response speed and fewer control parameters， realizing the robust control of the system and obtaining better dynamic performance.