Research On Grid-connected Inverter For Wind-solar-diesel Hybrid Generation System

As the rapid expansion of the distributed generating system such as wind power generation and solar energy power generation,the wind-solar-diesel hybrid generation system is more and more popular. There are three types mode method for grid connected of wind-solar-diesel hybrid generation system:DC BUS,Parallel and AC BUS.As the popular of the grid generation, the defects of the DC BUS mode and Parallel mode are more and more outstanding, and the merit of the AC BUS mode is more and more outstanding too.The AC BUS mode has been used in the foreign, but it's still in the primary stage in our country. The connected converter is the most important part of the AC BUS mode, and the performance of the connected inverter influence the stability of the generation system.The three types mode for grid connected of the wind-solar-diesel hybrid generation system has been brought up, and the detailed working process of the wind-solar-diesel has been given. And the characteristic of the connected inverter using in the wind-solar-diesel generation system has been given, the voltage control mode and the current control mode which use to implement grid connected has been thoroughly discussed, the improve of the conventional SPWM control mode has been thoroughly discussed too.For the connected inverter using in wind power generation system, three types of unloaded circuit has been given and the compare has been given too,the most merit method has been accepted and experimentized,and the boost circuit has been used to optimize the connected converter system. For the solar power connected inverter, the boost circuit has been used to realize the maximum power point tracking (MPPT), the compare of the method to realize MPPT has been given, and the method of three point compare has been experimented and discussed.