摘要
针对微网逆变器在孤岛与并网两种工作模式间的切换,出现入网电流冲击以及输出功率超调的问题。在下垂控制的基础上,借鉴虚拟同步机控制,在有功下垂控制中,添加惯量调节单元,以及在有、无功下垂控制中同时添加积分环节,设计改进的双模式统一控制策略。在抑制入网电流冲击的同时使系统功率以额定值稳定输出,并结合并网主动预同步控制,实现逆变器离/并网模式平滑切换。仿真结果验证,文中所提控制策略的有效性,逆变器在离网和并网模式均能实现输出功率的稳定控制,模式切换时无电压电流冲击。
In order to solve the problems of grid current impact and output power overshoot caused by the switching between the two working modes of remote island and grid connection of the microgrid inverter,an improved dual-mode unified control strategy was designed on the basis of droop control,drawing on the control of virtual synchronous machine,adding an inertia adjustment unit in the active droop control,and adding an integral link in the active and reactive droop control at the same time.While suppressing the impact of the incoming current,the system power is stably output at the rated value,and combined with the active pre-synchronization control of the grid,the smooth switching of the inverter's off/on-grid mode is realized.The simulation results verify the effectiveness of the control strategy proposed in this paper,and the inverter can achieve stable control of output power in both off-grid and grid-connected modes,and there is no voltage and current impulse when the mode is switched.
作者
李善寿
王思文
叶伟
黄梅初
谢陈磊
LI Shanshou;WANG Siwen;YE Wei;HUANG Meichu;XIE Chenlei(Anhui Provincial Key Laboratory of Intelligent Building and Building Energy Efficiency,Anhui Jianzhu University,Hefei Anhui 230022;Anhui Nanrui Jiyuan Power Grid Technology Co.,Ltd.,Hefei Anhui 230088)
出处
《东北电力大学学报》
2025年第3期62-69,共8页
Journal of Northeast Electric Power University
基金
国家重点研发项目(2023YFC3807704)
安徽省高校科研计划项目(2022AH010018)。
关键词
改进下垂控制
虚拟同步机
积分单元
预同步控制
平滑切换
improved droop control
virtual synchronous generator
integral unit
pre-synchronization
smooth switching
作者简介
第一作者:李善寿(1979-),男,博士,副教授,主要研究方向:电力电子变换技术、光伏发电技术、电能质量治理技术,xlisq79@163.com;通讯作者:王思文(1999-),男,在读硕士研究生,主要研究方向:微电网技术,yehvid@163.com。
