融合频域辨识和扰动观测的光伏并网逆变器无功电压自抗扰控制  

Autodisturbance Rejection Control of Reactive Voltage in Photovoltaic Grid Connected Inverters by Integrating Frequency Domain Identification and Disturbance Observation

作　　者：宗瑾 邵尹池 许鹏 沈小军[3] Zong Jin;Shao Yinchi;Xu Peng;Shen Xiaojun(State Grid Jibei Electric Power Co.,Ltd.,Beijing 100052,China;State Grid Jibei Electric Power Research Institute,Beijing 100089,China;College of Electronic and Information Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]国网冀北电力有限公司,北京100052 [2]国网冀北电力科学研究院,北京100089 [3]同济大学电子与信息工程学院,上海200092

出　　处：《电气自动化》2024年第6期86-88,92,共4页Electrical Automation

基　　金：国网科技项目“基于台区智能融合终端的大规模分布式电源接入配电网智能运维技术研究”(52018K220012)。

摘　　要：光伏发电容易受到天气等因素的影响,可能导致直流侧母线电压发生突变和大幅波动,甚至可能引起系统崩溃。为了保障电力系统安全平稳运行,提出融合频域辨识和扰动观测的光伏并网逆变器无功电压自抗扰控制方法。在控制输出电压和电流的基础上构建光伏并网逆变器数学模型,将扰动观测器估计的扰动信号用于前馈控制,利用频域辨识方法实现光伏并网逆变器无功电压自抗扰控制。试验结果表明,所提方法控制的逆变器仅在半个工频周期后即可恢复到稳态,在0.1~0.4 s时电流持续保持在13 A。所提方法具有较强的负载扰动抑制能力,能够有效避免电力系统崩溃。Photovoltaic power generation is easily affected by weather and other factors,which may lead to sudden changes and significant fluctuations in the DC side bus voltage,and may even cause system collapse.In order to ensure the safe and stable operation of the power system,a self-disturbance rejection control method for reactive power and voltage of photovoltaic grid connected inverters was proposed,which integrated frequency domain identification and disturbance observation.On the basis of controlling the output voltage and current,a mathematical model of the photovoltaic grid connected inverter was constructed.The disturbance signal estimated by the disturbance observer was used for feedforward control,and the frequency domain identification method was used to achieve automatic disturbance rejection control of the reactive voltage of the photovoltaic grid connected inverter.The experimental results show that the inverter controlled by the proposed method can recover to steady state only after half a power frequency cycle,and the current remains at 13 A continuously at 0.1~0.4 s.It is proved that the method has strong load disturbance suppression ability and can effectively avoid power system collapse.

关 键 词：频域辨识 扰动观测 光伏并网 逆变器 无功电压 自抗扰控制 

分 类 号：TM464[电气工程—电器]