低成本的高频、高带宽、高效光伏逆变器和稳定、可靠的并网技术对分布式光伏发电的推广应用至关重要。但是现有硅基IGBT器件本身特性限制了并网光伏逆变器开关频率以及控制带宽的进一步提高；同时，传统电压源和电流源逆变器本身难以通过减少功率回路电感压降来进一步降低导通损耗。因而，传统光伏并网逆变器的控制带宽和效率的提升都受到了一定限制。.为提高分布式并网并网逆变器的控制带宽以及效率，本项目提出了一种基于全MOSFET开关器件以及功率回路电感压降最低的新型混源逆变器方案。首先研究该类拓扑的形成演变规律；其次研究该类拓扑在不同工况以及不同坐标系下的特有控制规律；再次研究基于该类拓扑的分布式光伏发电系统的功率耦合、无功控制以及系统稳定问题；最后进行仿真和实验验证。.新型混源变换器的提出，能有效促进高效光伏并网逆变器技术的进一步发展，也能为基于电力电子变换器的微电网的稳定控制研究提供新的方法和直接硬件支持。

High frequency, high control bandwidth, high efficiency and low cost photovoltaic (PV) inverters and the related grid-tied control technique are very important for the application of the distributed PV power generator system. However, the characteristic of the silicon IGBT device limits the performace impovement of the switching frequency and the control loop bandwidth of grid-tied PV inverters. At the same time, it is very difficult to better the efficiency through dereasing the power losses of the inductors, since for a conventional voltage source or a current source inverter, the inductance in the power loop can hardly be reduced further.. In order to increase the switching frequency, the control loop bandwidth, and the efficiency for a grid-tied PV inverter, a novel MOSFET-based Hybrid Source Inverter (HSI) with the minimal inductor voltage drop in the power loop is proposed in this project. Firstly, the principle of HSI is investigated. Next, the special control of this type inverter will be analyzed, especially under the different working conditions and in the different control domains. And then, the power coupling between the HSI-based PV inverters and the distributed PV power generation system are studied, together with the reactive power control, and continuded with the control strategy to enhance the stability of the system. Finaly, the effectiveness of HSI on improving the efficiency and the stability of the distributed PV power generation system will be verified through simultaions and experiments.. It is certain that the proposed HSI theory and methology will advance the development of the high efficiency PV grid-tied inverter technique. It can also offer the strong research foundation for the appiclations of the power converters-based micro-grid, including the new methodology and hardwares.