模糊自抗扰附加阻尼控制抑制光火打捆经串补送出的次同步振荡

Supplementary damping control of SSO based on fuzzy active disturbance rejection control for photovoltaic-thermal-bundled system transmitted by series compensation

针对光伏、火电打捆经串补送出系统,提出一种基于模糊自抗扰的附加阻尼控制器,来抑制交流串补可能引发的次同步振荡。首先对打捆系统的振荡模式进行辨识,然后通过巴特沃斯带通滤波器将各振荡模式对应的转速分量分解到不同的通道,在每个通道中设计相应的自抗扰阻尼控制器。考虑到光伏出力具有波动性、间歇性等特点,运行状态比较复杂,采用模糊控制对自抗扰关键参数进行自整定改进。基于PSCAD/EMTDC仿真软件,以加入光伏并网的IEEE次同步振荡第一标准模型作为仿真算例进行验证。结果表明,所设计的模糊自抗扰附加阻尼控制器在系统受到扰动时,能够有效抑制火电机组的次同步振荡,具有较强的鲁棒性,且抑制效果优于传统的PID控制。

Aiming at photovoltaic-thermal-bundled power system,a supplementary damping controller based on fuzzy ADRC（ Active Disturbance Rejection Control） is designed to suppress the sub-synchronous resonance caused by series compensation. The oscillation modes of bundled power system are recognized,and the rotation rate deviation obtained by band pass filters is used as input to design supplementary damping controller based on ADRC. Considering the fluctuating and intermittent characteristics of photovoltaic,which makes the operating state complicated,the fuzzy control is used to improve the parameters of ADRC. The simulation example consisting of IEEE SSO（ SubSynchronous Oscillation） first benchmark model and grid-connected photovoltaic,is constructed based on PSCAD/EMTDC. The results show that the designed multi-channel supplementary damping controller based on fuzzy ADRC can effectively suppress SSO with strong robustness,which has greater advantages than traditional PID controller.