基于阻抗网络分析法的含双馈风电场桂林电网次同步振荡风险评估

Risk assessment of sub-synchronous oscillation of Guilin power grid with doubly-fed wind farms based on impedance network analysis

本文采用阻抗网络分析法探究了大规模风电并入桂林网区诱发次同步振荡的潜在风险。首先,针对桂林网区复杂网架结构,提出了一种适用于复杂系统分析的阻抗网络分析法,并根据双馈风机的电气特性建立了频域阻抗模型。在此基础上,结合桂林网区电网结构与线路参数,对正常运行与防冰预案两种运行方式进行阻抗分析。最后,基于PSCAD时域仿真平台,对阻抗分析结果进行验证。结果表明,在正常运行方式下,桂林网区几乎不存在发生次同步振荡的风险;而在防冰预案运行方式下,桂林网区出现次同步振荡的风险较高。

In this paper,the impedance network analysis method is used to explore the potential risk of large-scale wind power integration into the Guilin network to induce subsynchronous oscillation. Firstly,aiming at the complex grid structure of Guilin network area,an impedance network analysis method suitable for complex power system analysis is proposed. The frequency domain impedance model is established based on the electrical characteristics of the doubly-fed induction generator. On this basis,combined with the grid structure and line parameters of Guilin network area,the impedance analysis is carried out for the two modes of operation: normal operation and anti-icing operation. Finally,based on the PSCAD time domain simulation platform,the impedance analysis results are verified. The results show that under the normal operation mode,there is almost no risk of subsynchronous oscillation in Guilin network area. However,under the anti-ice operation mode,the risk of subsynchronous oscillation in Guilin network area is higher.