两级式三相光伏并网发电系统仿真研究  

Simulation Research of Two-Stage Three-Phase PV Grid-connected System

作　　者：王晓明[1] 吕金恒 强明辉[1] 

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃兰州730050

出　　处：《计算机仿真》2015年第6期112-115,共4页Computer Simulation

基　　金：大型风力发电机组并网控制关键技术研究(1011GKCA031);异构传输网络生存性研究(1010RJZA040)

摘　　要：针对光伏发电系统中光电转换效率较低以及并网过程中存在大量谐波的问题,为了提高光伏电池的效率和不影响光伏并网过程中电网的质量,在详细分析两级式光伏并网系统拓扑结构和电流环解耦控制的基础上,将模糊控制和PID控制相结合实现最大功率点跟踪,将SVPWM调制技术和双闭环控制策略相结合实现并网控制,最终建立光伏并网发电系统仿真模型。仿真结果表明模糊PID控制能更加快速、准确地跟踪光伏电池的最大功率,提高了光伏电池的工作效率;并网电流与电网电压同频同相,谐波含量较低,并且实现了向电网输出有功功率和无功功率的独立控制,系统动态响应速度较快,稳态性能良好。In the process of PV Grid, it has some problems that the photoelectric conversion efficiency is low and it has a large number of harmonics. In order to improve the efficiency of photovoltaic cells without affecting the quali- ty of the grid, this paper combined fuzzy control and PID control to achieve maximum power point tracking and SVP- WM modulation technology and double loop control method to achieve interconnection control. On the basis of analy- zing the topology structure of two - stage PV grid - connected system and decoupling control of current loop. Finally, the simulation model of PV grid - connected inverter system was established. The simulation results show that, the method of fuzzy PID control can track the maximum power point more quickly and accurately, and improve the effi- ciency of photovoltaic cells. The output current can track the power system voltage. It has low harmonic content and realizes the output of the grid independent about active power and reactive power. The system has an excellent steady - state response as well as an extremely fast dynamic response.

关 键 词：光伏并网系统 解耦控制 最大功率点跟踪 双闭环控制 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]