风电并网系统静态、次/超同步振荡安全域分析

Security region of static and SSO stability of wind power tied power system

风电大规模并网容易引发静态和次/超同步振荡(SSO)稳定问题,存在静态、SSO稳定运行边界。现有研究仅针对特定工况下风电SSO安全域进行研究,未考虑全工况下风电静态稳定和SSO稳定边界的关联性。为此,本文提出一种综合考虑静态、SSO稳定的安全域分析方法,首先基于潮流方程和全工况阻抗模型,给出风电静态、SSO稳定安全域定义;然后,针对风电功率注入空间提出了综合考虑静态、SSO稳定的安全边界搜索方法;最后,根据所提方法构建了全工况下风电并网多机系统安全运行稳定域,并通过仿真验证了所提方法有效性。

In wind power system connected to power grids,static and sub/super-synchronous oscillation(SSO)stability issues occur which exists stability boundaries.Existing studies only focus on the security region of SSO under specific operating condition,without considering the correlation between static and SSO stability boundaries under all operating conditions.To address this issue,this paper proposes a security region analysis method taking static and SSO stability into account.Firstly,the definition of static and SSO stability security region is introduced based on power flow equation and impedance model of all operating conditions;then,the stability boundary searching method is proposed for the wind power;finally,the static and SSO stability boundaries of the wind power multi-machine systems are constructed in accordance with the proposed method,and verified by simulation results.