摘要
针对多端口光伏直流升压汇集系统中DC/DC换流器存在的谐振问题,提出了基于无源阻尼的谐振抑制策略。通过对比不同运行工况下的等效阻抗,揭示了DC/DC换流器内部的谐振机理。综合考虑谐振抑制效果和阻尼电阻有功损耗,采用电容支路串联阻尼电阻的方式,通过对比谐振频率点的等效阻抗幅值与相邻正常频率点的阻抗幅值,给出了阻尼电阻的取值范围,有效抑制了换流器阻抗匹配引起的谐振。所提谐振抑制策略在保证换流器有较高传输效率的前提下,有效地提高了光伏并网系统的稳定性。
Aiming at the resonance problem of DC step-up collection system for multiport photovoltaic(PV),a resonance suppression strategy based on passive damping is proposed.By comparing the equivalent impedance under different operation conditions,the internal resonance mechanism of DC/DC converters is revealed.Considering the effect of resonance suppression and the active power loss of the damping resistor,the series connection mode of capacitor branch with damping resistor is adopted.By comparing the equivalent impedance amplitude of resonant frequency with the impedance amplitude of the adjacent normal frequency point,the value range of the damping resistor is given,which effectively suppresses the resonance caused by impedance matching of the converter.The proposed resonance suppression strategy can effectively improve the stability of PV grid-connected systems on the premise of high transmission efficiency of converters.
作者
贾科
陈金锋
钮厚敏
赵冠琨
秦继朔
毕天姝
JIA Ke;CHEN Jinfeng;NIU Houmin;ZHAO Guankun;QIN Jishuo;BI Tianshu(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2021年第15期109-114,共6页
Automation of Electric Power Systems
基金
国家重点研发计划资助项目(2018YFB0904104)。
关键词
光伏
阻抗建模
无源阻尼
谐振抑制
photovoltaic(PV)
impedance modeling
passive damping
resonance suppression
作者简介
通信作者:贾科(1986—),男,博士,教授,博士生导师,主要研究方向:电力系统保护与控制、新型配电网保护与故障定位。E-mail:ke.jia@ncepu.edu.cn;陈金锋(1996—),男,硕士研究生,主要研究方向:电力系统保护与控制、光伏并网系统协调控制。;钮厚敏(1998—),男,硕士研究生,主要研究方向:电力系统保护与控制。E-mail:1819303739@qq.com。
