基于RT-LAB的直驱风电场振荡仿真分析技术

Oscillation Simulation Analysis of Direct Driven Wind Farm Based on RT-LAB

直驱风电场并入弱交流电网时会出现振荡等不稳定问题,严重时会导致风电机组脱网、火电机组跳闸等事故。以新疆某地区的直驱风电场为研究对象,以阻抗分析法为依据,对直驱风电机组网侧逆变器进行阻抗理论建模,并在MATLAB中搭建风电机组逆变器并网模型,得到并网数字模型的阻抗来验证理论推导阻抗。最后以单机数字模型为基础,以新疆地区某直驱风电场的框架和参数为建模依据,考虑实时仿真的建模规则,在RT_LAB/MATLAB中搭建一个直驱风电场,依据并网点短路比的概念在直驱风电场和交流电网之间串入一定数值的电感模拟弱交流电网,最终复现出振荡,并简单分析了振荡的产生机理,为后续进一步解决直驱风电场振荡问题提供一种新的思路。

Oscillation or other unstable cases would occur when direct driven wind farm（DDWF） was integrated into a weak AC grid,and serious accident would be caused,such as inverter separated from the grid,thermal power trip etc.Based on application of certain DDWF in Xinjiang Province,theoretical impedance models of direct driven permanent magnet synchronous generator（D-DPMSG） were established with impedance method,and a D-DPMSG Simulink model was built on MATLAB platform and its impedance was used to verify theoretical impedance model.Then the DDWF was built on the platform of real time laboratory,considering real time simulation modeling rules by the D-DPMSG Simulink model,and the frame and parameters of wind farm.The oscillation was reproduced after weak AC power grid was imitated by connecting a inductor between the wind farm and the AC grid based on concept of short-circuit ratio.This method provides a new idea for further solving the DDWF oscillation problem.