构网型直驱风电机组间控制相互作用研究

构网型风电控制技术具有很好的弱电网适应性，可以有效避免风电并网次超同步振荡问题。但是虚拟同步控制引入固有的低频特征模式，接入强电网时会发生低频振荡，同时多台构网型风电机组并联运行时存在控制器相互作用。针对此问题，采用特征模式分析方法，研究了基于虚拟同步控制方法的构网型直驱风电机组并联运行时的控制相互作用及主导低频特征模式稳定性。揭示了虚拟惯量控制参数及系统运行方式对构网型风电机组并联运行低频振荡特性的影响。通过详细时域仿真验证了分析结果的正确性。

Research on control interaction between grid forming direct-drive wind turbines

Grid forming wind power control technology has good adaptability to weak power grid, which can effectively avoid to sub-and super-synchronous oscillation problem of the power grid integrated with wind power. However, virtual synchronous control inherently introduces inherent low frequency characteristic mode, and low frequency oscillation occurs when connected to strong power grid. Meanwhile, the controller interaction exists in multi grid forming wind turbines operating in parallel. In order to solve this problem, based on the characteristic mode analysis method, the control interaction and the stability of dominant low frequency characteristic mode of grid forming direct-drive wind turbines operating in parallel are studied based on virtual synchronous control method. The influence of virtual inertia control parameters and system operation mode on the low frequency oscillation characteristics of grid forming wind turbines operating in parallel is revealed. The correctness of analysis results is verified by detail time domain simulations.