直驱风电场高电压穿越控制策略研究

Study on High Voltage Ride⁃through Control Strategy of Direct⁃drive Wind Farm

高电压故障给新能源机组和电网安全稳定运行带来的危害日趋严重。本文首先介绍当前各国高电压穿越(HVRT)的技术标准,分析了电网中高电压故障产生的典型原因,根据原因和故障程度的不同将高电压故障分为两类。其次以永磁直驱风电机组(PMSG)为例,分析了PMSG在高电压故障期间的暂态过渡过程,并设计了高电压穿越控制策略。分析表明,典型参数设计下,利用该策略,PMSG机组难以穿越由直流输电系统闭锁等导致的深度高电压故障。进一步,提出了新能源机组与无功补偿装置的协同控制策略,以实现新能源机组在深度高电压故障下的穿越。最后基于PSCAD/EMTDC电磁暂态仿真验证了本文分析结果和所提方法的有效性。

The harm of high voltage fault of power grid to the safe and stable operation of new energy sets and power grid is becoming more and more serious.Firstly,this paper introduces the current national high voltage ride through(HVRT)standards and analyzes the typical causes of high voltage faults in the power grid.According to the different causes and degree of fault,the high voltage fault can be divided into two categories.Secondly,the permanent magnet direct driven wind turbine(PMSG)is taken as an example,the transient transition process of PMSG during the high voltage fault is analyzed and the high voltage ride through control strategy is designed.It is shown by the analysis that under the typical parameter design it is difficult for PMSG to pass through the deep high voltage fault caused by DC transmission system blocking.Furthermore,the coordinated control strategy of new energy unit and reactive power compensation device is proposed to realize the ride through of new energy unit under deep high voltage fault.Finally,the analysis results and the effectiveness of the proposed method are verified on the basis of PSCAD/EMTDC electromagnetic transient simulation.