基于双2阶广义积分器锁频环的电网同步技术

A Grid Synchronization Control Technique Based on the Double Second-order Generalized Integrator FLL

双2阶广义积分器锁频环(DSOGI-FLL)与其他常规锁相环相比,具有较好的电网适应性,在电网谐波含量较高及电网故障跌落的情况下可实现对电网电压基波频率和相角快速准确的捕获。构建了基于DSO-GI-FLL的并网变流器电网同步控制系统,仿真和实验结果表明,在电网背景谐波和故障跌落的情况下,该电网同步系统可更好地滤除电网电压低次谐波的干扰,更快、更稳定地实现相角和频率的同步,从而验证了该系统的有效性和可行性。

Compared to other routine phase locked loop methods, the double second-order generalized integrator fre- quency locked loop （DSOGI-FLL） has preferable grid adaptivity, achieving the rapid and accurate capture of the fun- damental wave frequency ＆ phase angle of grid voltage under abnormal circumstances,such as harmonic distortion and voltage dip.A DSOGI-FLL based synchronization control system of grid-connected converter is constructed.Simulation and experimental results finally indicate that the proposed grid synchronization system can better f＇dter the distortion of low-order harmonic voltage, meanwhile, more rapidly and stably achieving the synchronization of phase angle and frequency, thereby confirming the availability and feasibility of the system.