摘要
随着新能源的大规模并网,电网的稳定性和惯性下降,通过对并网变换器的虚拟同步控制可响应电网变化,为电网提供惯性支持,但现有常规的虚拟同步机控制方法输出指令恒定,无法根据机组工况进行动态调节,参与电网的调节能力有限。本文将模糊控制与虚拟同步机控制相结合,根据电网频率变化及当前机组的发电功率,通过模糊控制器,输出虚拟同步机的参考功率和工作模式(功率设定或下垂控制模式),根据机组运行工况调节虚拟同步机的控制指令,实现对新能源并网的智能控制。仿真结果表明,该方法能够根据各机组的实际运行工况及电网频率变化自动调节虚拟同步机输出,共同参与电网调频调压,维持电网稳定。
With the large-scale grid connection of new energy, the stability and inertia of the power grid have decreased. The virtual synchronous control of the grid connection converter can respond to the changes of the power grid and provide inertia support for the power grid. However, the output command of the existing conventional virtual synchronous machine control method is constant, which can not be dynamically adjusted according to the unit operating conditions, and the ability to participate in the regulation of the power grid is limited. According to the frequency change of power grid and the generation power of each unit, the fuzzy controller provides the reference power of virtual synchronous machine through fuzzy decision and control, and decides the working mode of virtual synchronous machine(power setting mode or droop control mode), so as to realize the intelligent control of grid connected new energy. The simulation results show that the proposed method can automatically adjust the output of virtual synchronous machine based on the actual operating conditions and frequency changes of power grid. The new energy can automatic participate in the frequency and voltage regulation of power grid by the intelligent controller, which maintains the stability of power grid.
作者
胡石阳
刘国荣
HU Shiyang;LIU Guorong(College of Electrical and Information Engineering,Hu’nan University,Changsha 410082;Hu’nan Institute of Engineering,Xiangtan,Hu’nan 411104)
出处
《电气技术》
2022年第10期10-17,共8页
Electrical Engineering
基金
湖南省重点研发计划项目(2015GK2004)。
关键词
虚拟同步机
模糊控制
新能源并网
智能控制
同步逆变器
virtual synchronous machine
fuzzy control
grid connected new energy
intelligent control
synchronous inverter
