摘要
采用了一种根据并网点电压跌落深度使逆变器发出一定无功功率,将基于二阶广义积分器(SOGI)的锁频环(FLL)和锁相环(PLL)相结合锁定相位,最终实现低电压穿越的方法,该方法利用SOGI-FLL提取频率信息实现锁频功能,为坐标变换提供相角信息,SOGI的陷波器特性滤除二次谐波,控制正负序电流内环的电流大小,进而控制输出有功和无功的大小,实现低电压穿越。仿真结果表明,该控制策略可以很好地滤除二次谐波,快速、精确地锁定相位,且具备低电压穿越能力。
A method is adopted to make the inverter emit a certain amount of reactive power according to the voltage drop depth of the connection point,and the frequency-locked loop(FLL)based on the second-order generalized integrator(SOGI)and the PLL are combined to realize phase-locking,thus the low voltage ride through(LVRT)is realized.This method uses SOGI-FLL to extract frequency information to realize frequency locking function,and provides phase angle information for coordinate transformation.The second harmonic is filtered out by the notch filter characteristics of the SOGI,and the current magnitude of the inner loop of positive and negative sequence currents is controlled,which in turn controls the magnitude of the output active and reactive power to achieve LVRT.The simulation results show that the control strategy can filter out the second harmonic,lock the phase quickly and accurately,and has the capability of LVRT.
作者
王志文
杨宝峰
施鑫
梁欢
WANG Zhiwen;YANG Baofeng;SHI Xin;LIANG Huan(School of Electric Power,Inner Mongolia University of Technology,Hohhot 010080,China)
出处
《内蒙古工业大学学报（自然科学版）》
2023年第3期244-251,共8页
Journal of Inner Mongolia University of Technology：Natural Science Edition
基金
内蒙古工业大学科学研究项目(BS2021011,ZZ202122)。
关键词
二阶广义积分器
锁频环
锁相环
低电压穿越
陷波器
second-order generalized integrator
frequency-locked loop
phase-locked loop
low voltage ride-through
notch filter
