摘要
介绍了三相光伏并网发电系统的工作原理,阐述了扰动观测法(P&O)实现最大功率跟踪控制(MPPT)的基本思想。对并网逆变器在d-q坐标系下的数学模型,采用逆系统方法进行线性化解耦,构造出伪线性系统。然后,运用变结构控制方法,设计出这个伪线性系统的变结构控制律。仿真结果表明该方法能够有效地控制并网电流波形趋于正弦波,并跟踪系统电压的相位,同时使系统具有较好的稳定性。
The working principle of the three-phase photovoltaic system is presented, as well as the basic theory to realize maximum power point tracking （MPPT） by the perturb ＆ observer algorithm （P＆O）. Based on the system model of the grid-connected inverter in the d-q- coordinate system, the inverse-system method was used to linearize and decouples the original system to build a pseudo-linear system. Then the variable structure control （VSC） theory was adopted to design the VSC laws of this pseudo-linear system. Simulation results show that the control method can effectively make the grid-connected current display rough sine waveform and track the phases of the grid voltage. Meanwhile, it enables the system to be more reliable.
出处
《华东电力》
北大核心
2008年第12期39-42,共4页
East China Electric Power
关键词
光伏并网系统
最大功率跟踪控制
逆系统方法
变结构控制
grid-connected photovoltaie power system
maximum power point tracking （MPPT）
inverse-system method
variable structure control （VSC）
