摘要
在直流母线电压波动的情形下,光伏并网变流系统易出现输入输出侧功率传输不平衡、运行不稳等问题,因此提出一种改进线性自抗扰控制策略。首先,建立变流系统物理模型和数学模型,并分析能量传输不平衡原理。然后,设计一阶线性自抗扰控制器取代传统比例积分矢量控制器。进一步,为加强扩张观测器扰动观测能力,引入新型参数解耦方法,形成解耦型改进自抗扰控制,提高系统的快速性和抗扰性。最后,依托频率响应特性曲线和多种模拟工况进行仿真验证。结果表明:相较于传统控制策略,改进线性自抗扰既具备优越的抑制直流侧母线电压波动的能力,又具有良好的扰动抵抗能力与短时暂态故障穿越能力,保证了系统的功率传输平衡与正常平稳运行。
When it comes to DC bus voltage fluctuation, a photovoltaic grid-connected converter system is prone to suffer from unbalanced power transmission and unstable operation at the input and output. Thus an improved linear active disturbance rejection control strategy is proposed. First, the physical and mathematical models of the converter system are established, and the principle of energy transmission imbalance is analyzed. Then, a first-order linear active disturbance rejection controller is designed to replace the traditional proportional integral vector controller. Further, in order to strengthen the disturbance observation ability of the extended observer, a new parameter decoupling method is introduced to form a decoupling improved active disturbance rejection control. This improves the speed and disturbance rejection of the system. Finally, based on the frequency response characteristic curve and a variety of simulation conditions, a simulation is carried out. The results show that, compared with the traditional control strategy, the improved linear ADRC not only is superior in suppressing voltage fluctuation of the DC side bus, but also has good disturbance resistance and short-time transient fault ride-through ability. This ensures power transmission balance and normal and stable operation of the system.
作者
周雪松
郭帅朝
马幼捷
李月超
马闯
ZHOU Xuesong;GUO Shuaichao;MA Youjie;LI Yuechao;MA Chuang(School of Electrical and Electronic Engineering,Tianjin University of Technology,Tianjin 300384,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2023年第3期68-78,共11页
Power System Protection and Control
基金
国家自然科学基金项目资助(51877152)~~。
关键词
改进自抗扰
直流母线电压
观测器
比例积分控制
参数解耦
improved active disturbance rejection control
DC bus voltage
observer
PI control
parameter decoupling
