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分析了托克托电厂阻塞滤波器(blocking filter,BF)引发机组异步自励磁的机理,探讨了兼顾抑制异步自励磁和扭振互作用(torsional interaction,TI)的BF改进设计方法。首先分析了BF参数对异步自励磁和TI模态的影响关系,发现增大电抗支路电阻或降低其品质因数有利于降低异步自励磁风险,但同时会在一定程度上削弱BF阻塞TI和暂态扭矩的效果;进而提出了BF改进设计的多目标参数优化思路,并基于特征值分析和优化搜索获得所有方式下能避免自励磁模态发散的最小增补电阻;最后通过串补输电系统的机网联合试验对改进BF进行检验,结果表明:改进BF能有效避免异步自励磁风险,并在正常情况下防止出现TI发散现象,同时验证了现场实测与仿真分析的一致性,为托克托串补和BF的安全投运创造了条件。
The mechanism of asynchronous self-excitation induced by blocking filter (BF) in Tuoketuo power plant is analyzed. An improved BF design method is also discussed, which suppresses asynchronous self-excitation and torsional interaction (TI). Firstly, the influence of BF parameters on the relationship between asynchronous self-excitation and TI mode is analyzed. It is found that increasing the reactance resistance or decreasing the quality factor can reduce the risk of asynchronous self-excitation. At the same time, State torque; and then put forward a BF multi-objective optimization design ideas, and based on eigenvalue analysis and optimization search to get all the way to avoid the self-excitation mode divergence minimum supplement resistance; Finally, by series compensation transmission system machine The experimental results show that the improved BF can effectively avoid the risk of asynchronous self-excitation and prevent the divergence of TI under normal conditions. The consistency between field measurement and simulation analysis is verified, Complement and BF put into operation to create a safe environment.