考虑非均匀通信延迟的多VSG功率振荡抑制

Power Oscillation Suppression of Multi-VSG Considering Non-Uniform Communication Delays

随着新能源渗透率的不断提高,电力系统中虚拟同步发电机(virtual synchronous generator, VSG)技术由于能提高系统频率稳定性,已成为新能源并网的关键技术。然而,多虚拟同步机系统会产生严重的功率振荡问题。针对这一问题,提出了一种分布式自适应参数抑制虚拟同步机功率振荡的方法。首先,将虚拟阻抗与频率变化率以及自适应惯量相结合,有效抑制了多VSG系统的功率振荡。其次,在传输线路通信延迟非均匀的情况下,提出了将集中控制和分布式控制相结合并相互作为后备保护的运行策略。最后,通过搭建多VSG系统仿真验证所提方法的有效性,结果表明,该方法在非均匀通信延迟下鲁棒性强、延迟裕度高,能促进多VSG系统的实际应用,提升机组集群的频率响应性能。

With the rapid development of renewable energy sources,virtual synchronous generators(VSG)have garnered significant attention as a key technology for enhancing the stability of power systems.However,severe poweroscillation issues are inherent to multi-VSG systems.In this study,a control strategy was investigated for a multi-VSG parallel operation.A distributed adaptive parameter method is proposed to suppress power oscillations.First,by integrating the virtual impedance,frequency rate of change,and adaptive inertia,this method effectively reduces the initial power overshoot and improves the stability and robustness of the system.Second,in the case of non-uniform communication delays in transmission line communication,an operation strategy is introduced,wherein centralized and distributed controls serve as mutual backup protection,further enhancing system reliability.Finally,the simulation results demonstrate the robustness and high delay tolerance of the method considering non-uniform communication delays,promoting the practical application of multi-VSG systems and enhancing the frequency response performance of generator clusters.