基于虚拟功率的非计划性VSG并离网平滑切换控制策略OA
Control Strategy for Seamless Unplanned Transition Between Grid-connected and Islanded Modes of VSG Based on Virtual Power
虚拟同步发电机(VSG)离网向并网切换时会形成较大冲击电流,传统预同步方案在并网使能时可能出现稳定性问题.针对该问题,提出无锁相环预同步单元在非并网时刻切除的控制方法.首先基于VSG的转子运动方程和励磁方程在内的基本控制结构,推出VSG合闸瞬间造成大冲击电流的主要影响因素;在考虑虚拟电抗的物理模型和虚拟功率输出特性的基础上,制定虚拟电抗和带通滤波相结合的虚拟功率预同步控制方案;最后,在2 kW仿真和实验中验证所提方法的有效性.仿真和实验结果表明,采用该方法可以实现离网与并网的平滑切换,且预同步单元可在并网后依旧使能的可行性,展现出良好的稳定性能.
To address the large inrush current during the switching of a virtual synchronous generator(VSG)from off-grid to grid-connected,and the stability issues of traditional pre-synchronization schemes,a control method for the phase-locked loop(PLL)pre-synchronization unit to be cut off in non-grid-connected time was proposed.First,based on the VSG's rotor motion and excitation equations,the main factors affecting the inrush current at closing were identified.Then,considering the physical model of virtual reactance and the characteristics of virtual power output,a virtual power pre-synchronization scheme combining virtual reactance and band-pass filtering was developed.Finally,the effectiveness of proposed method was verified through 2 kW simulations and experiments.Results show that proposed method enables smooth switching between off-grid and grid-connected modes and allows for the removal of the pre-synchronization unit at any time after grid connection,demonstrating good stability.
丁津津;彭勃;张峰;毛荀
国网安徽省电力有限公司电力科学研究院,安徽 合肥 230000国网安徽省电力有限公司电力科学研究院,安徽 合肥 230000国网安徽省电力有限公司电力科学研究院,安徽 合肥 230000国网安徽省电力有限公司电力科学研究院,安徽 合肥 230000
信息技术与安全科学
虚拟同步发电机合闸冲击电流预同步虚拟功率虚拟电抗平滑切换
virtual synchronous generator(VSG)closinginrush currentpre-synchronizationvirtual powervirtual reactancesmooth transition
《电气传动》 2026 (6)
16-21,6
国网安徽省电力有限公司科技项目(B3120523000G)
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