基于PLC网络的光伏阵列追日跟踪控制

Controlling Photovoltaic Array to Pursue Sun Based on PLC Networks

为提高太阳能光伏发电的效率,提出了运用PLC网络技术实现对光伏阵列的追日跟踪控制,即通过3个感光传感器的合理布置,配合T型遮光板,采集太阳在空中的位置信息,以逻辑状态输入PLC,经主站PLC处理后以网络传送至各从站PLC,再驱动阵列中的各X、Z轴执行电机,使光伏阵列平面法线追踪对准太阳。并介绍了系统的构建方法,给出了三菱FX2N系列PLC的组网硬件连接方法及初始化程序,阐述了传感器与PLC的连接及受光状态与太阳位置的关系,设计了软件控制流程图。经实验室模拟验证,证明该系统是一种可行的太阳能光伏阵列追日跟踪控制系统。

In order to increase efficiency of solar photovoltaic power generation, we use the PLC network technology to realize the controlling of photovoltaie array to pursue the sun. We collect the position information of the sun via proper disposition of three photosensitive sensors cooperating with T-type light screen, and import the data collected to PI.C by logic states. After processed by main station PLC, the data is transmitted to each substation by networks for driving the X axis and Z-axis executive motor in each panel to aim the normal of photovoltaic array to the sun. It is a system of two- axis controlling photosensitive sensor based photovoltaic array which can pursue the sun. We present the network con- struction hardware connee＊ion methods and the initialization program of Mitsubishi FX2N series PLC, discuss the connec- tion between the sensors and PLC and the relationship between light received states and the position of the sun, and de- sign the software controlling flow chart. It has been proved as a feasible photovoltaic panel array control system of pursu- ing the sun with simulation experiment in laboratory.