风电场站单机聚合模型倍乘元件阻抗参数设计

Design of impedance parameters of a multiplier element in an aggregation model of a single wind turbine of a wind farm

现有较大规模风电场站等值模型中常采用倍乘方式实现机组聚合,以节省建模与仿真计算等资源。针对风电场站单机聚合模型倍乘元件在风电场建模中应用广泛、参数设置缺少规律性的现状,对倍乘元件阻抗参数在风电场等值建模中的影响展开研究。首先,以PSCAD软件官网的经典倍乘元件入手,分析各个自定义阻抗参数间的关系与重要程度。其次,搭建风电场基准测试模型并展开等值聚合,通过参数遍历测试,研究倍乘元件阻抗参数对等值误差的影响机理,依据稳态运行点等值误差、仿真步长两个方面的限制,提出倍乘元件阻抗参数选择方法。最后,选取稳态运行点、三相电压跌落、宽频振荡3个工况,对影响机理与推荐参数展开验证。从等值误差的角度,对大型风电场建模仿真中倍乘元件阻抗的参数设计提供了参考建议。

In existing equivalent models of large-scale wind farms,multi-wind turbines are often aggregated using a multiplier element to save modeling and simulation computing resources.The multiplier element of a single-wind turbine aggregation model of wind farm is widely used in wind farm modeling,but the parameter setting lacks regularity.Thus this paper studies the influence of multiplier element impedance parameters on wind farm equivalent modeling.First,it starts with a multiplier element on the official website of PSCAD to analyze the relationship and importance of each self-defined impedance parameter.Second,a reference test model of a wind farm is built and equivalent aggregation is carried out.Through a parameter traversal test,the influence mechanism of impedance parameters of multiplier elements on equivalent error is studied.From the limitations of steady-state operating point equivalent error and simulation time step,the method of impedance parameter selection of the multiplier element is proposed.Finally,three operating conditions of steady-state operating point,three-phase voltage dip and broadband oscillation are selected to verify the influence mechanism and recommended parameters.Some suggestions are provided for the parameter setting of the impedance of the multiplier element in modeling and simulation of large wind farms in terms of equivalent error.