针对电网电压三相不平衡问题,设计了双二阶广义积分器锁频环(DSOGIFLL),利用DSOGIFLL的角频率反馈代替双二阶广义积分器锁相环(DSOGIPLL)的频率反馈,实现了对输入电压频率的自适应控制.在Matlab/Simulink平台对电压不对称跌落、谐波污染、相位突变、频率突变4种情况进行仿真,并与DSOGIPLL进行性能对比,结果表明,DSOGIFLL比DSOGIPLL有更好的频率与相位追踪特性,尤其在相位突变和频率突变时效果更为明显.%In view of the problem of three-phase voltage unbalance, the double second-order generalized integrator frequency-locked loop rn(DSOGI-FLL) was designed.It used DSOGI-FLL angular frequency feedback instead of the second order generalized integrator phase-locked loop (DSOGI-PLL) frequency feedback, and realized the adaptive control of the input voltage frequency. Four conditions including asymmetric voltage drop, harmonic pollution, phase mutations, frequency mutations were simulated in Matlab/Simulink platform, and its performance was compared with DSOGI-PLL.The results showed that DSOGI-FLL had the better characteristics in tracking phase and frequency in all kinds of cases; especially so when the phase variation and frequency variation happened.
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