风力发电系统中基于双同步参考坐标变换的锁相环设计与实现

DESIGN AND REALIZATION OF PHASE LOCKED LOOP BASED ON DOUBLE SYNCHRONOUS REFERENCE FRAME IN WIND POWER SYSTEMS

该文提出的基于双同步参考坐标变换的锁相环方法通过双dq变换和解耦计算能够检测出不平衡电网电压中的正序分量和负序分量,从而消除电压不平衡的影响。设计了基于单片机的硬件电路,编制了锁相算法的C语言源程序,实验结果验证了该方法的可行性和正确性。

In order to assure grid side converter and STACOM in wind power systems of running normally under unbalanced grid voltage, the phase of grid voltage need to be obtained quickly and accurately by phase locked loop systems. Software of phase locked loop based on double synchronous reference frame （DSRF SPLL） was put forward to detect the positive and negative sequence components of unbalanced grid voltages, and eliminate the effect of unbalanced grid voltage on phase detection by double dq transformation and decoupling calculation. The hardware for single chip computer was designed and C language programming of DSRF SPLL algorithm was debugged. The experimental results verified the feasibility and correctness of DSRF SPLL proposed in the paper.