适用于无直流侧电压传感器单相级联H桥型光伏逆变器的直接功率模型预测控制方法

针对大功率光伏发电系统复杂度较大的情况，文中介绍了一种适用于无直流侧电压传感器单相级联H桥型光伏逆变器的直接功率模型预测控制方法。该方法采用顺序计算的思路，将各H桥视为独立的逆变器并逐个完成各H桥的控制。同时，在针对单个H桥的最优调制函数进行计算时，利用逆变器输出电压的变化量对应H桥直流侧电容电压进行重构，并将电容电压控制量嵌入到最优调制函数中以实现电容电压平衡控制。最后，基于Matlab/Simulink仿真环境建立了系统模型，对该方法的性能进行了验证。

Direct Power Model Predictive Control Method for DC-Side Sensor-Less Single-Phase Cascaded H-Bridges Photovoltaic Inverters

In order to reduce the complexity of photovoltaic generation system,a direct power model predictive control method suitable for DC-side sensor-less photovoltaic inverters is presented in this paper.Based on the idea of serial calculation,each Hbridge is considered as a single inverter.In the meantime,when the optimal modulation function is being calculated for each Hbridge,the DC-side capacitor voltage of each H-bridge is reconstructed using the increment of output voltage of inverters.In addition,a term about the error of capacitor voltage is embedded into the optimal modulation function to keep capacitors’voltages balance.After building a system model through Matlab/Simulink,the performance of the presented method is verified.