基于单二阶广义积分器的三相数字锁相环设计

在一些与电网三相电压相关联的电力电子设备中,获得电网电压实时基波相位是非常重要的。针对电网出现三相电压不平衡的情况,提出了一种基于单二阶广义积分器的三相数字锁相环的设计方案,并通过Matlab/Simulink进行仿真,仿真结果验证了锁相环在电网三相跌落而出现三相电压不平衡时,仍可以准确跟踪三相电网相位。设计方案原理清晰,结构简单,易于实现。可以很方便的移植到FPGA中,构成全硬件集成锁相环;也可以移植到DSP中,构成全软件锁相环。

The Design of Three-phase Digital Phase-locked Loop Based on Single Second-order Generalized Integrator

In some electronic devices associated with power grid three-phase voltage,it is very important to obtain the real-time fundamental wave phase of the power grid voltege accurately. Aiming at the condition of the power grid appearing unbalanced three-phase voltage, this paper put forward a design scheme of three-phase digital phase lock loop based on single second-order generalized integrator and do the simulation by Matlab/Simulink. The simulation results show that the phase lock loop can track the phase of three-phase power grid accurately when power grid appear three-phase drop and unbalanced three-phase voltage. The design principle is clear, simple structure and easy to implement. It is easy to transplant in FPGA and constitute the entire hardware integrated PLL; it also can be transferred in DSP and constitute a software phase locked loop.