基于频域振荡模式的次/超同步分量可观可控分析  

Observability and Controllability Analysis of Sub-/Super-synchronous Components Based on Frequency Domain Oscillation Mode

作　　者：任健淼 肖仕武 REN Jianmiao;XIAO Shiwu(State Key Laboratory of New Energy Power System(North China Electric Power University),Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市102206

出　　处：《电力系统自动化》2023年第3期30-39,共10页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52130709)。

摘　　要：直驱风电机组接入弱交流电网时会引发电力系统的次/超同步振荡,产生的超同步分量幅值一般不同于次同步分量,具体产生机理缺少清晰解释。文中基于频域正负序耦合阻抗回路的振荡模式,定量分析了次/超同步分量的可观可控度,解释了次/超同步分量的可观可控规律。首先,建立直驱风电机组并网系统的频域正负序回路耦合阻抗方程,分析了次/超同步分量与正负序分量、dq分量之间的关系,解释了次/超同步分量幅值不相等的成因。然后,从定量的角度推导了次/超同步振荡模式在正负序分量、次/超同步分量上的可观可控度表达式,实现了次/超同步分量可观可控分析。最后,应用灵敏度的方法分析了影响次/超同步分量大小的参数,并针对理论分析结果进行了仿真验证。When direct-driven wind turbine is connected to a weak AC power grid, it will cause sub-/super-synchronous oscillation of the power system. The amplitude of the generated supersynchronous component is generally different from that of the subsynchronous component, and the specific generation mechanism is not clearly explained. In this paper, based on the oscillation mode of the positive and negative sequence coupling impedance loop in the frequency domain, the observability and controllability of the sub-/super-synchronous components are quantitatively analyzed, and the observability and controllability laws of the sub/super-synchronous components are explained. First, the positive and negative sequence loop coupling impedance equation of the grid connected with frequency-domain direct-driven wind turbine system is established, the relationship between the sub-/supersynchronous component, the positive and negative sequence component, and the dq component is analyzed, and the cause of the unequal amplitude of the sub-/super-synchronous component is explained. Then, the expression of the degree of observability and controllability of sub-/super-synchronous oscillation mode on positive and negative sequence components and sub-/supersynchronous components is derived from a quantitative perspective, and the analysis of the degree of observability and controllability of sub-/super-synchronous components is realized. Finally, the sensitivity method is used to analyze the parameters that affect the magnitude of sub-/super-synchronization components, and the simulation results are verified against the theoretical analysis results.

关 键 词：直驱风电机组 次/超同步振荡 阻抗特性 频率耦合 可观度 可控度 

分 类 号：TM712[电气工程—电力系统及自动化] TM315