基于有源滤波的并网逆变器仿真研究

Simulation Research on the Grid-connected System Inverters Based on Active Power Filter

光伏发电产生的直流电能要想并入电网使用,就必须要经过逆变器的逆变。有源滤波电路的拓扑结构和并网逆变器拓扑结构又十分相似,因此可以根据有源滤波和光伏并网系统在拓扑结构和控制方式上的相似性,将二者统一起来共同控制,这样既可以实现光伏并网作用,又可以达到滤除谐波的功能。这样可以通过比较和分析LCL滤波电路在光伏并网和有源滤波上的不同工作方式,然后拿出一套可以满足二者共同需求的LCL滤波电路设计方法,达到逆变之后滤波的目的。阐述了LCL电路相比其他滤波方式的优势,并且对LCL电路的设计以及参数的选择进行了仿真,使其达到优化光伏并网逆变的目的。

The energy crisis has swept the whole earth in the 21 st century,and all kinds of traditional fuels have been used out,and the serious pollution of environment has restricted the further development of the world. In this way,the clean and no-pollution renewable energy is very precious. And the solar technology shows great potential in many kinds of renewable energies. So if we want to have a widespread application of solar energy and connect to the grid,the gridconnected technology must be safe and reliable. And the DC power produced by photovoltaic power generation should use the inventers when it connects to the grid. We know that the topology structures of active filter and inverter are very similar. Therefore,using the similarities of them to study the unified control of photovoltaic grid system and harmonic compensation of APF can make it have two functions. This paper puts forward a design method of LCL filter circuit which can be used on both photovoltaic and APF based on summarizing the application under each situation. This paper talks the advantage of LCL circuit compared with other filtering ways,and puts forward the design principle,the choice of parameters and the simulation experiments to get a proper grid-connected photovoltaic system inverter.