摘要
新能源发电功率的随机波动、直流负荷及储能装置的频繁投切会引起直流母线电压快速波动,会对系统稳定性造成影响,严重时甚至会使整个系统失稳.为此,研究人员提出引入虚拟直流电机控制技术改善系统的稳定性,但其致稳机理尚不明确.为明确该机理,基于零极点形式表示的控制系统传递函数构造了虚拟直流电机控制的小信号模型,用控制系统的带宽和相频裕度分析了虚拟直流电机的惯性和阻尼参数对控制系统稳定性的影响,并确定了两个参量与控制系统开环增益和穿越频率的对应性,得到了一般性结论.进一步以BUCK变换器为控制对象展开分析,得到虚拟直流电机和控制系统参数间具体的数学关系.在Matlab/Simulink环境下进行仿真验证,仿真结果证明了以上分析结果的正确性和有效性.
In order to clarify the stabilization mechanism of virtual DC motors,a small signal model of virtual DC motors control was constructed based on the universal transfer function of the control system.The inertia and damping parameters of the virtual DC motors were analyzed by using the bandwidth and phase frequency margin of the control system The influence of the stability and the correspondence between the two parameters and the open-loop gain and crossing frequency of the control system were determined,and a general conclusion was obtained.Further analysis is carried out with the BUCK converter as the control object,and the specific mathematical relationship between the virtual DC motor and the control system parameters is obtained.The simulation verification is performed in Matlab/Simulink environment,and the simulation results prove the correctness and validity of the above analysis results.
作者
尹英龙
刘宝泉
YIN Ying-long;LIU Bao-quan(School of Electrical and Control Engineering, Shaanxi University of Science & Technology, Xi′an 710021, China)
出处
《陕西科技大学学报》
北大核心
2021年第2期146-152,共7页
Journal of Shaanxi University of Science & Technology
基金
陕西省科技厅工业科技攻关计划项目(2015GY074)。
