虚拟同步双馈风机对同步机作用路径及低频振荡影响分析
摘要：针对具有虚拟同步控制的双馈感应发电机机对系统低频振荡产生影响的问题，基于虚拟同步双馈风机的内电势运动方程，通过建立两机系统的线性化模型，分析了虚拟同步双馈风机对同步机作用的路径和物理过程，并采用阻尼转矩法阐明了虚拟同步双馈风机对同步机低频振荡的影响机理，最后进行了仿真验证。仿真结果表明：虚拟同步双馈风机内电势的相位受同步机内电势相位和幅值的变化而变化，继而直接影响同步机有功功率，或通过影响同步机端电压幅值变化的支路间接影响同步机有功功率，它们是虚拟同步双馈风机影响同步机阻尼的主要途径，此外，增大虚拟惯性时间常数和阻尼系数可以改善同步机低频振荡的阻尼，而增大电压控制带宽则会使同步机低频振荡的阻尼恶化。
Abstract:In allusion to the impact of doubly fed induction generator (DFIG) based wind turbines (WTs) with virtual synchronous control (VSynC based on low frequency oscillation in power system, firstly, based on internal e.m.f. motion equation of DFIG-based WTs with VSynC and by means of establishing a linearized model of two-machine system both the path, through which the DFIG-based WTs with VSynC acted on the synchronous generator, as well as the physical process were analyzed. Secondly, utilizing damping torque method the mechanism, by which the DFIG-based WTs influenced low frequency oscillation in synchronous generator, was expounded. Finally, the proposed items were verified by the simulation based on Matlab/Simulink. Simulation results show that the phase of internal e.m.f. of DFIG-based WTs with VSynC varies with the variation of phase and amplitude of the internal e.m.f. of synchronous generator and then the active power of synchronous generator is directly impacted, or through impacting the branch, which impacts the terminal voltage amplitude variation of synchronous generator, the active power of synchronous generator is indirectly impacted, so they are the main path through which the DFIG-based WTs with VSynC impacts the damping of synchronous generator. Besides, the damping for low frequency oscillation in synchronous generator can be improved by increasing both virtual inertia time constant and damping coefficient, however the damping for low frequency oscillation in synchronous generator will be worsened while the bandwidth of the voltage control increases.
标题：虚拟同步双馈风机对同步机作用路径及低频振荡影响分析
英文标题：Analysis of Impact of DFIG-based Wind Turbines with Virtual Synchronous Control on the Action Path and Low Frequency Oscillation of Synchronous Generator
作者：迟永宁, 雷雨, 季笑庆, 刘俊旭, 何维, 章晓杰,
关键词：双馈感应发电机, 风力机, 虚拟同步控制, 内电势, 运动方程, 作用路径, 低频振荡抑制,
发表日期：2021-06-03
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