风电场运行中电网频率和相位信息的检测

Phase and Frequency Measurement for Wind Farm Operation

风电机组的运行控制需要快速准确的获取电网的频率、相位信息。随着风力发电技术的不断发展,大型风力发电机的运行研究已从电网理想状态深化到电网不平衡状态。本文提出了一种含正负序分离功能的软件锁相环,能在电网含有负序分量和谐波时快速准确的测定电网的频率和相位,为电网不平衡状态下风电机组的控制提供可靠的信息。对该方法的原理进行了详细的分析,并用Matlab/Simulink进行了仿真验证。

Wind power generation controlling system needs the phase and frequency information of the grid.With the development of wind power generation technology,large-scale wind turbine generator’s research deepened from the ideal grid conditions to the unbalanced grid conditions.This article proposed one kind software phase-locked loop with the function of the positive and negative sequence separation.This new SPLL can get the grid's real-time frequency information when the grid has the harmonic or negative sequence.As a preparative research fruit,this scheme is capable of offering the basis for the controlling of WTG under unbalanced grid conditions.Detailed theoretical analysis has carried on to this method's principle and the simulation confirmation has carried on with Matlab/Simulink.