基于电导增量法的太阳能光伏阵列MPPT仿真

PV Array MPPT Simulation Based on the Conductance Increment Method

针对太阳能光伏阵列最大功率跟踪控制问题,利用PSCAD/EMTDC软件测量了光照强度从0到1200 W/m2和温度从0到100℃条件下光伏阵列的短路电流及开路电压,结果表明:恒温条件下,随着光照强度的升高,开路电压及短路电流均逐渐增大;恒光强条件下,随着运行温度的升高,开路电压逐渐减小,而短路电流逐渐增大.然后采用滞环比较的方法产生控制脉冲,从跟踪速度和精度两方面对基于电导增量法的MPPT控制策略进行了改进,建立仿真模型并实验,完成最大功率跟踪控制,实验结果表明光伏阵列最大输出功率会随着光照强度的增大而增大.

This paper focused on the problem of MPPT control for PV arrays.Under the solar irradiance levels from 0to 1200W/m2and the ambient temperatures from 0 to 100℃ ,the short circuit current and open circuit voltage of PV array have been measured using PSCAD/EMTDC software.And the result showed that in the condition of constant temperature,the open circuit voltage and short circuit current increased with the increase of illumination intensity;in the condition of constant light intensity,the open circuit voltage decreased and the shortcircuit current increased with the increase of temperature.The hysteresis loop was used to generate the control pulse.The MPPT control method based on conductance increment method has been improved from the two aspects of tracking speed and accuracy.A simulation model of system was built to achieve MPPT control.Finally,the experimental result showed that the maximum output power of the PV array increased with the increase of illumination intensity.