摘要
典型下垂控制下的储能逆变器在受扰时存在频率变化率过大问题,采用低通滤波器的下垂控制则存在振荡问题。为此,提出一种基于自适应滤波时间常数的储能逆变器下垂控制策略。首先推导建立了包含滤波器的下垂控制储能逆变器输出频率小信号模型,然后采用根轨迹法分析了滤波器时间常数对其稳定性的影响,进一步提出一种自适用滤波时间常数下垂控制策略,并给出了参数设计准则。最后,通过MATLAB/Simulink仿真对所提策略进行了验证。结果表明,所提方法可有效减小频率变化率并抑制振荡,从而降低分布式电源脱机的风险。
The energy storage inverter under typical droop control has a problem of excessive frequency change rate when being disturbed,while the droop control using low-pass filters has an oscillation problem.Therefore,a droop control strategy for energy storage inverters based on adaptive filtering time constant was proposed.Firstly,the small-signal modeling of output frequency of droop-controlled energy storage inverter including filter was derived and established.Then,the root locus method was used to analyze the influence of filter time constant on its stability.Further,a droop control strategy with adaptive filter time constant was put forward,and the parameter design criteria were given.Finally,the proposed strategy was validated through MATLAB/Simulink simulation.The results indicate that the proposed method can effectively reduce the frequency change rate and suppress oscillations,thereby reducing the risk of distributed power supply offline.
作者
李宽龙
黎朝晖
夏得青
向星宇
黄华鸿
Li Kuanlong;Li Zhaohui;Xia Deqing;Xiang Xingyu;Huang Huahong(College of Railway Transportation,Hunan University of Technology,Zhuzhou Hunan 412007,China;College of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)
出处
《电气自动化》
2024年第4期34-36,40,共4页
Electrical Automation
关键词
储能逆变器
下垂控制
小信号稳定性
根轨迹法
自适应滤波
energy storage inverter
droop control
small signal stability
root locus method
adaptive filtering
