电力系统及其自动化学报2017，Vol.29Issue(6)：53-58,64,7.DOI:10.3969/j.issn.1003-8930.2017.06.008
基于电网电压全前馈的七电平光伏并网系统
Seven-level PV System Based on Full Feed-forward of Grid Voltage
摘要
Abstract
In this paper,a novel grid-voltage full feed-forward control scheme of a seven-level photovoltaic(PV)grid-connected system for coping with the high total harmonic distortion(THD)of output grid-current existing in the tradi-tional single-phase multi-level grid-connected PV inverter is proposed. The seven-level inverter consists of a DC/DC con-verter that is composed of a boost converter and a current-feed forward converter,an auxiliary circuit,a full-bridge pow-er converter and an inductance-capacitance-inductance(LCL)filter,which are connected in cascade. The LCL filter can effectively attenuate the higher harmonics of current caused by pulse width modulation(PWM). Meanwhile,the capaci-tor current loop is employed to damp the resonant peak caused by the LCL filter and enhance the stability,and a full feed-forward of grid voltage control strategy is proposed to prevent the current distortion caused by the harmonics in grid voltage. Simulation results demonstrate that the proposed scheme can eliminate the influence of grid voltage on grid-cur-rent such that the grid-current is in the same frequency and same phase as those of grid voltage,which can enhance the quality of output current effectively.关键词
光伏并网系统/七电平逆变器/LCL滤波器/电容电流反馈/电网电压全前馈Key words
grid-connected photovoltaic system/seven-level inverter/LCL filter/capacitor current feedback/full feed-forward of grid voltage分类
信息技术与安全科学引用本文复制引用
潘嘉进,刘彦呈,张勤进,刘厶源..基于电网电压全前馈的七电平光伏并网系统[J].电力系统及其自动化学报,2017,29(6):53-58,64,7.基金项目
中央高校基本科研业务费专项资金资助项目(3132014322) （3132014322）
