光储一体化变流器并网/离网切换控制技术研究  

Research on On-grid/off-grid Switching Control Technology of Photovoltaics and Energy Storage Integrated Converter

作　　者：杨新华[1] 郑越 徐铮 马建立 YANG Xin-hua;ZHENG Yue;XU Zheng;MA Jian-Li(Lanzhou University of Technology,Lanzhou 730050,China;不详)

机构地区：[1]兰州理工大学,电气工程与信息工程学院,甘肃兰州730050 [2]北京智源新能电气科技有限公司,北京102600

出　　处：《电力电子技术》2022年第1期79-82,共4页Power Electronics

摘　　要：针对光伏发电系统和储能系统组成的一体化变流器在并网工作模式与离网工作模式相互切换时采用不同控制策略存在电压畸变和电流冲击的问题,提出基于比例-比例积分(P-PI)的改进下垂控制策略,统一并网/离网控制策略,并在下垂系数中增加积分环节,利用积分环节改善变流器由并网模式切换到离网模式时的稳定性。优化相位修正算法和电压、频率同步控制策略,保证变流器执行并网操作前与电网电压幅值、频率、相位保持一致,实现变流器平滑无缝进入并网工作模式。利用以TMS320F28335数字控制器为核心的光储一体化变流器样机对所设计的并网/离网切换控制策略进行验证,实验结果表明提出的控制策略正确有效,解决了变流器并网/离网工作模式切换过程中电压畸变和电流冲击问题,实现了变流器稳定运行。Aiming at the problems of voltage distortion and current surge in different control strategy when the integrated converter composed of photovoltaic power generation system and energy storage system switches between ongrid and off-grid operating modes,an improved droop control strategy based on proportional-proportional integral(PPI)is proposed,on-gridoff-grid control strategy is unified,an integral link to the droop coefficient is added,and the integral link to improve the stability of the converter when switching from on-grid mode to offgrid mode is used.The phase correction algorithm and the voltage and frequency synchronization control strategy is optimized to ensure that the converter is consistent with the grid voltage amplitude,frequency,and phase before the grid-connected operation,so that the converter can smoothly and seamlessly enter the on-grid working mode.Integrated converter composed of photovoltaics and energy storage with TMS320F 28335 digital controller as the core is used to verify the designed ongrid/off-grid switching control strategy.The experimental results show that the control strategy is correct and effective which solves the converter's on-grid/off-grid working voltage switching and current impact problems to achieve a stable operation of the converter.

关 键 词：变流器 改进下垂控制 并网/离网切换控制 

分 类 号：TM46[电气工程—电器]