基于低电压恢复策略的永磁直驱风电场等值建模  

Equivalent modeling of permanent magnet direct-driven wind farm based on low-voltage recovery strategy

作　　者：李应龙 蔺红[1] LI Yinglong;LIN Hong(School of Electrical Engineering,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学电气工程学院,新疆乌鲁木齐830047

出　　处：《现代电子技术》2022年第7期137-142,共6页Modern Electronics Technique

基　　金：国家自然科学基金项目(51667019)。

摘　　要：对风电并网的暂态特性分析时,假设对每台风电机组进行详细建模,将会引起模型阶数高、仿真效率低等问题,需要在一定误差允许范围内进行风电场等值建模。首先在PSCAD/EMTDC平台建立永磁直驱风力发电机组(D-PMSG)模型,分析三相短路故障时低电压恢复策略对有功恢复的影响,根据低电压恢复策略对永磁直驱风电场初次分群;然后对于有功斜坡恢复策略的风电机组,分析网侧变流器的控制策略对D-PMSG有功暂态响应的影响;以稳态功率和电压跌落为分群指标,采用减法聚类算法二次分群。通过算例验证,在一定误差允许范围内,该分群方法得到的永磁直驱风电场等值模型的暂态功率曲线能够很好地拟合永磁直驱风电场的详细模型的暂态功率曲线,验证了该等值方法的有效性和准确性。When analyzing the transient characteristics of wind power grid connection,high model order and low simulation efficiency will occur if each wind turbine is modeled in detail.Therefore,it is necessary to perform the equivalent modeling of wind farm within a margin of error.A D-PMSG(direct-driven permanent magnet synchronous generator)model is established on the platform PSCAD/EMTDC to analyze the influence of low-voltage recovery strategy on active power recovery in the case of three-phase short-circuit fault.The permanent magnet direct-driven wind farm is clustered preliminarily according to the low voltage recovery strategy.And then,for the wind turbine with active slope recovery strategy,the influence of the control strategy of the grid-side converter on D-PMSG active transient response is analyzed.The steady-state power and voltage sag are taken as the clustering indexes,and the subtractive clustering algorithm is used for secondary clustering.The examples validate that the transient power curve of the permanent magnet direct-driven wind farm equivalent model obtained by the clustering method can fit that of the detailed model of the permanent magnet direct-driven wind farm well within a certain margin of error,which validates the effectiveness and accuracy of the equivalent means.

关 键 词：永磁直驱风电机组 等值建模 低电压恢复策略 暂态特性分析 减法聚类算法 网侧变流器 二次分群 风电场 

分 类 号：TN03-34[电子电信—物理电子学] U469.72[机械工程—车辆工程]