基于自适应参数虚拟同步机的微电网稳定控制

随着分布式发电技术与微电网技术的快速发展，现代电力系统尤其是微网中的电力电子化程度越来越高。微电网中电力电子变流器因缺乏必要的惯性和阻尼成分，从而影响到系统稳定。针对此问题，文章通过模拟传统同步机转子方程，基于下垂控制添加虚拟惯性和阻尼，搭建了用于逆变器控制的虚拟同步机控制模型；研究了惯性和阻尼参数对虚拟同步稳定控制效果的影响，进而通过设计合理的触发机制提出了自适应参数虚拟同步控制策略，可根据控制需求灵活切换自适应参数调整模式。最后的仿真验证和对比分析表明，所提策略一定程度上有利于增强系统的频率和功率稳定。

Research on Stability Control of Microgrid Applying Virtual Synchronous Generator with Adaptive Parameters

With the rapid development of the distributed generation technology and microgrid technology， more and more power electronic devices are used in modern power system especially in microgrids. Meanwhile， power electronic converters in microgrid may affect the stability of the system due to lack of necessary inertia and damping. To deal with the problem， this paper， by simulating the traditional synchronous machine rotor equation， equips the droop control with virtual inertia and damping to set up a virtual synchronous generator control model for inverter control. Next， the influence of inertia and damping parameters on the control stability of the virtual synchronous generator is studied. By designing reasonable trigger mechanism， the virtual synchronous generator control strategy with adaptive parameters is put forward， which can flexibly switch adaptive parameter adjustment mode according to control requirements. At last， simulation result and comparative analysis show that the proposed strategy is beneficial to enhance the frequency and power stability of the system to a certain extent.