基于RGA和αβ坐标系的直驱风场内机组间谐波交互分析

Analysis of harmonic interaction between internal units of direct drive wind farm based on RGA andαβcoordinate system

针对直驱风场内各机组电流控制回路间的谐波交互特性展开研究。基于αβ坐标系,采用准比例谐振控制(Quasi-Proportional Resonance, QPR)跟踪风机输入参考电流。考虑逆变器数字延时、附加电容电流反馈有源阻尼抑制LCL固有谐振,结合风场拓扑结构,建立直驱风场多输入多输出传递函数矩阵模型。基于相对增益矩阵(Relative Gain Array, RGA)原理,定量地分析了不同控制参数、等效电网电感及并网风机台数对各机组电流控制回路间谐波交互作用的影响规律。分别在Matlab/Simulink软件和StarSim+PXI硬件在环实时仿真平台上搭建了直驱风场并网模型,仿真和实验结果验证了机组间谐波交互作用分析方法及结果的有效性和正确性。

Harmonic interaction characteristics between current control loops of different units in the direct drive wind farm are studied.Based onαβcoordinate system,the Quasi-Proportional Resonance(QPR)controller is used to track the input reference current of the direct drive wind turbine.Considering the digital delay of the inverter,the capacitive current feedback active damping is used to suppress the natural resonance of the LCL filter.Combined with the wind farm topology,a multi-input and multi-output transfer function matrix model of the direct drive wind farm is established.Based on the principle of Relative Gain Array(RGA),the influence of different control parameters,equivalent grid inductance and the number of grid-connected units on the harmonic interaction between the current control loops of direct drive wind turbines in the direct drive wind farm is quantitatively analyzed.The direct drive wind farm model is respectively built on Matlab/Simulink software and StarSim+PXI hardware-in-the-loop real-time simulation platform.Simulation and experimental results verify the validity and correctness of the harmonic interaction analysis method and results.