光伏发电系统低电压穿越的逆变器控制策略切换改进研究  

Research on Improved Switching Strategy of Inverter Control of Photovoltaic System Under Low-Voltage Ride-Through

作　　者：孙婷婷 Sun Tingting(School of Electrical and Energy Engineering,Nantong Institute of Technology,Nantong,China)

机构地区：[1]南通理工学院电气与能源工程学院,江苏南通

出　　处：《科学技术创新》2023年第27期1-4,共4页Scientific and Technological Innovation

基　　金：2022年南通市科技计划项目-基础科学研究计划-青年科技人才专项-指令性项目《大型海上风力发电机组MPPT控制关键技术研究》(JC12022032)

摘　　要：为满足光伏发电系统并网导则对低电压穿越能力的要求,光伏发电系统并网逆变器需按照并网导则要求设定其q轴无功电流控制参考值。逆变器采用最大电流输出控制,对应设定d轴有功电流控制参考值,取消直流母线电压外环控制。当低电压穿越过程结束后,逆变器需切换回双环控制。本文对逆变器控制策略切换的方法进行了改进,实现了低电压穿越工况到故障后稳态工况的平滑过渡。通过在MATLAB/Simulink仿真平台搭建并网光伏发电系统仿真模型,验证了本文控制方案对光伏发电系统低电压穿越过程结束阶段暂态运行效果的改善。In order to meet the requirements of low-voltage ride-through(LVRT)capability in grid code of the photovoltaic(PV)systems,grid-connected inverters of PV systems need to set the q-axis reactive current control reference value in accordance with the requirements of grid code.The inverter adopts the maximum current output control,correspondingly sets the d-axis active current control reference value,and cancels the DC-bus voltage outer loop control.When the LVRT process finishes,the inverter needs to switch back to the double loop control.In this paper,the switching scheme of inverter control strategy is improved,and the smooth transition from LVRT condition to the post-fault steady state condition is realized.The simulation model of the grid-connected PV system was built on the MATLAB/Simulink simulation platform to verify the improvement effect of the control scheme on the transient operation of the PV system at the end of the LVRT process.

关 键 词：光伏发电 低电压穿越 逆变器 直流母线电压 单内环直接电流控制 

分 类 号：TM464[电气工程—电器]