摘要
高比例可再生能源并入电网,导致系统惯量、阻尼缺失,进一步影响系统稳定性。虚拟同步发电机(Virtual Synchronous Generator,VSG)因其具有主动构网能力,能动态支撑电网而得到广泛应用。然而,当电网电压出现跌落故障时,容易发生功角失稳及过流问题,严重影响电力系统暂态稳定性及损害电力电子设备。本文基于VSG故障时暂态功角失稳原因及故障电流特性,提出了一种基于多状态跟随与虚拟阻抗联合调控的VSG低电压穿越控制策略。所提方法能自适应调节有功功率指令值,并根据电网电压跌落情况改进无功环控制,同时引入虚拟电阻,在故障时刻既能稳定功角,也能抑制瞬态故障电流。最后,基于Matlab/Simulink构建了仿真分析模型,验证了特性分析和所提低电压穿越控制方法的有效性。
With the increasing integration of high proportion of renewable energy into the grid,the system inertia and damping are lost,further affecting the system stability.The virtual synchronous generator(VSG)has been widely used due to its active grid-forming ability,which can dynamically support the grid.However,when the grid voltage drops due to faults,it is easy to occur the transient angle instability and overcurrent problems,seriously affecting the transient stability of the power system and damaging the power electronic equipment.Based on the transient angle instability reasons and fault current characteristics of the VSG during faults,a low-voltage ride-through control strategy based on multi-state tracking and virtual impedance joint regulation was proposed.The proposed method can adaptively adjust the active power command value and improve the reactive power loop control according to the grid voltage dropping situation.A virtual resistance was introduced to stabilize the angle and suppress the transient fault current at the fault moment.Finally,a simulation analysis model was established based on Matlab/Simulink to verify the effectiveness of the characteristic analysis and the proposed low-voltage ride-through control method.
作者
林海丰
陈众
蒋洋
LIN Haifeng;CHEN Zhong;JIANG Yang(Key Laboratory of Smart Grid Operation and Control,Changsha University of Science&Technology,Changsha 410114,China)
出处
《电工材料》
2025年第6期36-43,共8页
Electrical Engineering Materials
关键词
虚拟同步发电机
惯量支撑
故障穿越
故障限流
暂态稳定性
virtual synchronous generator
inertia support
fault ride-through
fault current limiting
transient stability
