MW级光伏发电系统并网技术方案研究

Research on Grid-connected Technology of MW Level Photovoltaic Power Generation System

MW级光伏发电系统一般都以1MW为最小并网单元,而1MW单元并网技术方案有多种,本文分别对集中式、组串式和集散式等几种并网技术方案进行研究对比,对比内容包括安全性、建设成本、转换效率和维护性等。最后,提出了一种优化的集中式并网技术方案,该方案具有多路MPPT跟踪功能,采用双绕组变压器代替双分裂变压器,且具有变压器软并网功能,以及体积小、成本低、维护方便等特点,具有较高的推广价值。

MW level photovoltaic power generation systems are generally 1MW as the smallest grid unit,the 1MW grid-connected technology has a variety of Solutions.In this paper,research on the grid-connected inverter,such as centralized inverter,string inverter,scatter MPPT and centralized inverter,and so on.Research contents include security,construction cost,conversion efficiency and maintenance,etc.In the end,an optimized centralized grid-connected inverter technical scheme is proposed.The scheme has the multi-MPPT function,double-winding transformer instead of double split transformer,and has the characteristics of small size,low cost,easy maintenance and so on,have higher promotion value.