基于PMSG-WECS的双自适应虚拟惯性控制方法研究

Research on dual adaptive virtual inertial control based on PMSG⁃WECS

基于提高电网的频率响应能力的目的,该文提出了一种基于永磁同步发电机(PMSG)的风力发电系统的双自适应虚拟惯性控制方法。通常情况下,采用虚拟惯性常数来模拟同步发电机,其释放的能量完全依赖于频率变化率(ROCOF)。然而,仅依赖于ROCOF并不能充分利用风机的惯性。为了获得更好的系统频率响应,该方法充分利用风力发电机(WT)的转子动能和风力发电系统(WECS)的直流链电容能量作为系统频率的支撑,并根据电网频率和电网频率变化率(ROCOF)自适应调节虚拟惯性参数,加速系统频率的恢复过程。通过仿真分析可知,提出的控制方法能更有效地利用风机动能和直流链电容的能量,减小了频率偏差和频率变化率。

Based on the aim of improving the frequency response ability of power grid,a dual adaptive virtual inertia control method is proposed in this article.Usually,a virtual inertia constant is used to simulate a synchronous generator,and the energy released is completely dependent on the Rate Of Change Of Frequency(ROCOF).However,relying solely on ROCOF cannot fully utilize the inertia of the wind turbine.In order to obtain better system frequency response The method makes full use of the rotor kinetic energy of Wind Turbine(WT)and DC-link capacitor energy of Wind Energy Conversion System(WECS)for system frequency support,and the virtual inertia parameter can be adjusted adaptively according to the grid frequency and ROCOF.The simulationanalysis,the proposed control method can more effectively utilize the power of the wind turbine and the energy of the DC link capacitor,reducing frequency deviation and frequency change rate.