基于MPPT的光伏并网逆变器研究  

Research on photovoltaic grid connected inverter based on MPPT

作　　者：张志敏 彭红义 潘若妍 周振雄 ZHANG Zhimin;PENG Hongyi;PAN Ruoyan;ZHOU Zhenxiong(School of Electrical and Information Engineering,Beihua University,Jilin Jilin 132000,China)

机构地区：[1]北华大学电气与信息工程学院,吉林吉林132000

出　　处：《电源技术》2023年第1期108-111,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金(61179012);吉林省发改委项目(2019C058-1);吉林省教育厅项目(JJKH20200042KJ),吉林省教育厅科学技术研究项目(JJKH20180342KJ);吉林省科技厅项目(20200404203YY)。

摘　　要：对三相光伏并网逆变系统的最大功率点跟踪控制和并网逆变电流控制进行研究,提出了带滞环比较的变步长扰动观测法,根据功率的预测变化实现快速跟踪最大功率点,能够消除稳定过程中的功率波动。为了实现并网电流和电压的同步,利用锁相环技术与并网电压前馈补偿的复合控制策略进行网侧逆变器的控制。在Matlab/Simulink软件环境中进行了对比仿真,结果表明:改进后扰动观测法的跟踪速度提高了40%以上,跟踪精度也提高了4.0%,而且振荡较小,可以准确快速地实现光伏发电最大功率点跟踪,而且并网电流能够跟踪电网电压,谐波含量较小。The traditional maximum power point tracking algorithm of photovoltaic power generation system has the problem of slow tracking speed and low accuracy in the case of sudden changes in the external environment to oscillate near the maximum power point. A variable step disturbance observation method with hysteresis comparison is proposed, which can quickly track the maximum power point according to the predicted change of power, and eliminate power fluctuations in the stable process. In order to realize the synchronization of grid connected current and voltage, a composite control strategy of phase locked loop technology and grid connected voltage feedforward compensation is used to control the grid side inverter. A comparative simulation was carried out in the Matlab/Simulink software environment. The results show that the tracking speed of the improved disturbance observation method is increased by more than 40%, the tracking accuracy is also increased by 4.0%. The oscillation is small,which can accurately and quickly achieve the maximum photovoltaic power generation. Power point tracking, and the grid connected current can track the grid voltage, and the harmonic content is small.

关 键 词：光伏发电并网 MPPT 变步长扰动观测法 复合控制策略 

分 类 号：TM615[电气工程—电力系统及自动化]