光伏并网系统的优化设计与协调控制技术展望

随着光伏并网发电容量在电网中的渗透率越来越高,用户和电网对光伏并网系统的优化设计和控制性能提出了更高的要求。论述了光伏并网系统的技术发展现状;给出了光伏并网逆变器的拓扑结构发展情况,并将其总结为隔离型与非隔离型并网逆变器、单级式与双级式并网逆变器、两电平与多电平逆变器等3种类型;对并网逆变器与无功补偿装置的协调控制、并网逆变器间的虚拟同步机控制以及全局同步脉宽调制技术进行了分析和展望。

Prospects of Optimal Design and Coordinative Control Technology of Grid Connected Photovoltaic Power Generation Systems

Along with the rapid increase of peneration level of grid connected photovoltaic (PV) generation systems, higher requirements of the optimized design and control performance of the grid connected PV systems both at user and grid sides are brought forward. The technology development status of grid connected PV systems is given, and topological development of grid connected PV inverters is described and sorted into three types: isolated or non-isolated inverter, single-stage or two-stage inverter, and two-level or multi-level inverter. The future challenges and prospects are given on the coordinative control between static var compensator and grid connected PV inverter, the virtual synchronous generator control among grid connected PV inverters, and the technology of global synchronous pulse width modulation.