改进型双二阶广义积分器锁相环

Improved dual second-order generalized integrator PLL

在电网电压中含有一定的直流分量时,由于双二阶广义积分器锁相环(Dual Second-Order Generalized Integrator PLL, DSOGI-PLL)系统对直流分量的衰减不足将导致其检测到的电网同步信号存在较大波动,其中频率与相角的大幅波动可能导致系统锁相失败。针对此问题提出改进方案,通过在已有系统中引入一个调节量使其对直流分量有更大的衰减,同时系统的动态性能、滤波效果并未受到损失。最后在电网电压存在直流时进行仿真分析,结果表明传统DSOGI-PLL的性能得到进一步提升。

When the grid voltage contains a certain DC component, the grid synchronization signals detected by dual second-order generalized integrator phase-locked loop (DSOGI-PLL) will greatly fluctuate in which the sharp fluctuation frequency and phase may cause the failure of phase locking, due to the DSOGI-PLL does not attenuate the DC component sufficiently. Aiming at this problem, an improved scheme is proposed. An adjustment factor is introduced into the existing system which will have more attenuation of the DC component. Meanwhile, the dynamic performance and filtering effect of the system are not impaired. Finally, simulation analysis is performed under the condition that grid voltage contains DC component and the results show that the performance of the conventional DSOGI-PLL is further improved.