基于零序注入法的并网光伏发电系统功率控制  

Power Control of Grid Connected Photovoltaic Power Generation System Based on Zero Sequence Injection Method

作　　者：张兰乾 潘浩东 陈锋 ZHANG Lan-qian;PAN Hao-dong;CHEN Feng(China Construction Eighth Engineering Bureau General Contracting Construction Co.,Ltd,Shanghai 201100,China)

机构地区：[1]中建八局总承包建设有限公司,上海201100

出　　处：《计算机仿真》2025年第1期106-110,共5页Computer Simulation

基　　金：中绿电若羌400万千瓦光伏项目(2023-01)。

摘　　要：光伏发电系统的功率输出受光照强度、温度等因素影响较大,导致功率输出具有间歇性和波动性,因此提出基于零序注入法的并网光伏发电系统功率控制方法。计算光伏阵列下光伏电池输出电流,结合最大功率点电压,采用牛顿迭代法完成最大功率点跟踪。建立电压-电流双闭环控制器,并在其中加入虚拟复阻抗,结合最大功率点调节光伏阵列输出。最后采用最优零序注入法生成零序调制波,结合零序电压等信号生成最优调制信号,控制逆变器输出,从而完成光伏发电系统功率的平衡控制。实验结果表明,所提方法的最大功率点跟踪效果较好,电流总谐波畸变率更小、功率控制更平衡。The power output of photovoltaic power generation system is greatly influenced by factors such as light intensity and temperature,which leads to intermittent and fluctuating power output.Therefore,a power control of grid connected photovoltaic power generation system based on zero sequence injection method is proposed.Calculate the output current of photovoltaic cells under photovoltaic array,and combine with the maximum power point voltage,use Newton iteration method to complete the maximum power point tracking.The voltage-current double closed-loop controller is established,and the virtual complex impedance is added to it to adjust the output of photovoltaic array in combination with the maximum power point.Finally,the optimal zero-sequence injection method is used to generate zero-sequence modulation wave,and the optimal modulation signal is generated by combining zero-sequence voltage and other signals to control the output of inverter,thus completing the power balance control of photovoltaic power generation system.The experimental results show that the maximum power point tracking effect of the proposed method is better,the total harmonic distortion rate of current is smaller and the power control is more balanced.

关 键 词：并网光伏发电系统 功率平衡控制 逆变器 最优零序注入法 双闭环控制器 

分 类 号：TM464[电气工程—电器]