基于定频SVPWM调制VF-DPC控制策略光伏并网逆变器的研究

将空间矢量调制(SVM)固定开关频率的直接功率控制应用到光伏并网逆变器控制策略中，从而克服了基于滞环比较的开关频率不固定的缺点。针对电网电压存在谐波对DPC控制性能的影响，本文采用了虚拟磁链定向的控制方式，提高系统的抗干扰能力。同时详细分析了虚拟磁链的估算，进而省去了电网电压传感器，降低了系统的成本。在Matlab/simulink建仿真模型，通过分析验证，系统稳定并且达到了并网的要求。

Research based on the fixed frequency SVPWM modulation VF - DPC photovoltaic (pv) grid inverter control strategy

The space vector modulation (SVM) fixed switching frequency direct power control is applied to photovoltaic (pv) grid inverter control strategy, so as to overcome the switching frequency based on hysteresis comparison of faults. In view of the grid voltage harmonics effect on the properties of DPC control, this paper used the control mode of virtual flux, improve the anti-interference ability of system. Virtual flux estimation are analyzed in detail at the same time, thus eliminating the grid voltage sensors, reduce the cost of the system.Build simulation model in Matlab/simulink, through the analysis of authentication, the system is stable and has reached the requirement of grid.