基于全时段模拟积分的光伏发电系统发电量计算

The power generation of photovoltaic systems based on full-time analog integral calculation

为了准确计算光伏系统的输出功率和估计年平均发电量,以提高光伏并网发电系统的供电安全性和稳定性,文章提出一种基于全时段模拟积分的光伏系统输出功率计算方法。根据光伏发电系统的结构和工作原理对光伏发电子阵列进行了建模,对无法直接获得环境参数地区的温度及光辐射量进行了全时段模拟,提出了光伏发电系统输出功率计算方法;对功率积分后可以估算任意太阳辐射量、环境温度和系统结构下的光伏发电系统年均发电量。通过与实际光伏电站工程算例的对比表明,利用该方法估算的发电量结果能满足工程实际要求,可为光伏发电系统设计人员和决策人员提供参考。

In order to accurately calculate the output power and estimate the average annual power generation of photovoltaic system, improye stability and security of grid-connected photovoha!c system, a calculating method called full-time fitting is developed for the photovohaic system output power. For those photovohaic arrays whose ambient parameters are not able to acquire directly, a mathematical model is established to calculate the PV output power based on the structure and working principle of the photovoltaic system and a full-time fitting of the local temperature and so- lar radiation. The average annual generation of photovoltaic system can be estimated at any solar irradiation level, ambient temperature, parameters of the photovohaic module by integrating the out- put power. Comparing calculating results with actual PV power plant project example, the estimation of power generation meets engineering requirements. The simulation results will provide a reference for system designers and decision makers of the photovoltaic power generation.