摘要
直流配电网具有低惯性弱阻尼特征,负荷投切、分布式能源出力波动等扰动,会对直流母线电压造成严重影响。类比交流系统中的虚拟同步发电机控制,文章提出了基于电压-电流下垂控制的直流虚拟同步发电机自适应惯性控制策略;建立了直流虚拟同步发电机小信号模型,推导出直流母线电压与直流侧输出电流之间的传递函数;根据直流母线电压暂态振荡特征,设计了自适应虚拟惯性系数策略。仿真结果表明,所提控制方法能够改善系统暂态响应,提高直流配电系统的稳定性。
The DC distribution network is featured with low inertia and weak damping,and disturbances such as load switching and distributed energy output fluctuations will have a serious impact on the DC bus voltage.Based on the virtual synchronous generator control in analog AC system,this paper proposes an adaptive inertial control strategy for DC virtual synchronous generator based on voltage-current droop control.A small signal model of DC virtual synchronous generator is established,and the transfer function between the DC bus voltage and the DC side output current of the converter is derived.According to the transient oscillation characteristics of DC bus voltage,an adaptive virtual inertia coefficient strategy is designed.The simulation results show that the proposed control method can improve the transient response of the system and improve the stability of the DC distribution system.
作者
李广浩
彭克
张新慧
李海荣
刘磊
Li Guanghao;Peng Ke;Zhang Xinhui;Li Hairong;Liu Lei(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255049,Shandong,China)
出处
《电测与仪表》
北大核心
2021年第9期135-141,共7页
Electrical Measurement & Instrumentation
基金
国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600)
国家自然科学基金资助项目(51807112)
国家电网公司科技项目(52094017000W)。
关键词
直流配网
虚拟同步发电机
小信号模型
自适应虚拟惯性
DC distribution network
virtual synchronous generator
small signal model
adaptive virtual inertia control
