摘要
在弱电网条件下,逆变器作为电网系统的关键部件,其运行情况将直接影响电网发电质量。为了提高光伏并网逆变器的稳定性,实现逆变器的自动控制,研究提出了一个基于空间矢量脉宽调制和虚拟阻抗校正的控制方法。研究首先对逆变器的运行过程进行建模,并分析影响逆变器稳定性的主要因素。之后,研究根据分析结果,应用空间矢量脉宽调制、虚拟阻抗校正、二阶广义积分滤波器改进策略等对其运行进行控制。结果表明,研究提出的控制方法应用到系统中后,系统的输出转换效率、电压谐波畸变率指标分别为98.48%和0.53%,相较于其他方法,其稳定性能明显更优。研究提出的方法能够有效控制逆变器的运行,维持电网的稳定。
Under the condition of weak power grid,inverter is the key component of power grid system,and its operation will directly affect the power generation quality.In order to improve the stability of grid-connected PV inverters and realize the automatic control of the inverters,a control method based on space vector pulse width modulation and virtual impedance correction is proposed.Firstly,the operation process of the inverter is modeled,and the main factors affecting the stability of the inverter are analyzed.Then,according to the analysis results,the paper uses space vector pulse width modulation,virtual impedance correction,and improvement strategy of second-order generalized integral filter to control its operation.The results show that after the proposed control method is applied to the system,the output conversion efficiency and voltage harmonic distortion ratio of the system are 98.48%and 0.53%,respectively,and the stability performance is obviously better than that of other methods.The proposed method can effectively control the operation of the inverter and maintain the stability of the power grid.
作者
彭魏玮
PENG Weiwei(Putian University,Putian Fujian 351100,China)
出处
《佳木斯大学学报(自然科学版)》
2025年第7期43-46,共4页
Journal of Jiamusi University:Natural Science Edition
关键词
弱电网
光伏并网
逆变器
稳定控制
空间矢量脉宽调制
虚拟阻抗
weak power grid
photovoltaic grid-connected
inverter
stability control
space vector pulse width modulation
virtual impedance
