基于综合等效灵敏度的短路电流抑制措施确定方法

随着电网规模的不断增大,短路电流超标已成为电力系统安全运行所面临的重大问题。文中提出了一种限制电网短路电流的综合等效灵敏度法,将限制短路电流问题分为限制短路电流和电气安全校核2个子问题。在限制短路电流子问题中,统一了线路开断、发电机停运、线路出串、线路装设串联阻抗、更换高阻抗变压器、母线分裂等限流措施的模拟,进而利用支路阻抗追加法计算上述措施实施后的节点阻抗参数和元件开断的短路电流综合等效灵敏度。在电气安全校核子问题中,对电网进行潮流和稳定校核,实现短路电流限制。青海电网的实际算例验证了文中方法的有效性,研究成果可为青海电网限制短路电流提供借鉴。

Method for determining short-circuit current limiting measures based on comprehensive equivalent

As the scale of the power grid continues to increase, short-circuit current exceeding the standard has become a major problem in operation. A comprehensive equivalent sensitivity method for limiting short-circuit current of power grid is proposed. The method is divided into two sub-problems: limiting short-circuit current and electrical safety check. In limiting short-circuit current sub-problem, unified short-circuit current limiting measure simulation method is proposed to simulate line breaking, generator breaking, line out of string, line installation series impedance, replace high impedance transformer, bus splitting, etc. Furthermore, using the branch impedance addition method, the node impedance parameters after the implementation of the above measures and the short-circuit current comprehensive equivalent sensitivity of the component breaking are calculated. In the electrical safety check sub-problem, the power flow and stability are checked after short-circuit current measure is applied to ensure the effectiveness of short-circuit current limiting measure. The practical examples of Qinghai power grid verify the effectiveness of the proposed method and can provide reference for the planning and operation of Qinghai power grid.