在分析共直流母线并网系统的基础上，研究并设计一种直流模块式光伏并网控制系统，采用前级共直流母线的直流并联模块，后级集中并网逆变的结构，提高系统可靠性及灵活性，减小功率器件应力，增强系统冗余性，重点介绍了并网逆变控制器的数学模型及相应控制器设计方法。最后，设计一台实验样机进行实验研究，实验结果验证了方案的可行性及控制器设计方法的正确性。%In this paper, a DC⁃modular photovoltaic grid⁃connected control system has been researched and de⁃signed, which is based on a common DC bus grid system. A structure about dc module of the common dc bus in the former stage and centralized grid⁃connected inverter in the later stage is adopted in the system. The reliability and flexibility of the system can be improved, and the stress of power devices can be reduced, moreover, the redundan⁃cy of the system can be enhanced by this structure. The mathematical model and the corresponding design method of the grid⁃connected inverter are introduced in detail in this paper. Finally, an experimental prototype is designed for test, and the experimental results verify the feasibility and correctness of the controller design method.
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