摘要
随着以新能源为主体的新型电力系统的发展,电力系统中的背景谐波问题愈发严重,威胁新能源并网系统的稳定运行。为此,提出了一种基于卡尔曼滤波的LCL型新能源并网逆变器的控制策略;采用卡尔曼滤波算法对传感器的采样测量信号进行最优辨识,从复杂、随机的电网谐波背景中提出真实的测量值,从而保证并网逆变器的稳定运行。同时,针对LCL型逆变器存在的高频谐振问题,基于卡尔曼滤波提取的准确状态变量,设计了合适的虚拟阻尼控制,实现LCL的有源阻尼。最后,基于Matlab/Simulink搭建相应的仿真模型,通过仿真实验,验证卡尔曼滤波算法的有效性与所提出改进控制策略的可行性。
With the development of new power systems,the background harmonic problem in the power system has become increasingly serious,posing a threat to the stable operation of new energy grid-connected systems.To address this issue,a control strategy for an LCL-type new energy grid-connected inverter based on Kalman filtering is proposed.The Kalman filtering algorithm is used to perform optimal estimation of sensor sampled measurement signals,thereby extracting real measurement values from the complex and random grid harmonic background,ensuring the stable operation of the grid-connected inverter.Meanwhile,considering the high-frequency resonance problem of the LCL-type inverter,an appropriate virtual damping control is designed based on the accurate state variables extracted by the Kalman filter to achieve active damping of the LCL.Finally,a corresponding simulation model is constructed by Matlab/Simulink,and simulation experiments are conducted to verify the effectiveness of the Kalman filtering algorithm and the feasibility of the proposed improved control strategy.
作者
覃发梧
杜翔
周婵
QIN Fawu;DU Xiang;ZHOU Chan(Guangxi Transportation Design Group Co.,Ltd.,Guangxi Nanning 530029,China)
出处
《广西电力》
2023年第4期24-29,37,共7页
Guangxi Electric Power
关键词
新能源
并网逆变器
卡尔曼滤波
电网谐波
虚拟阻尼控制
new energy
grid-connected inverter
Kalman filtering
grid harmonics
virtual damping control
