基于故障状态模拟的输电线路短路点定位方法

A Short-circuit Location Method for Transmission Line Based on Fault State Simulation

摘要:

输电线路是电力系统的重要组成部分,容易发生各种短路故障。为了保持系统的完整性,必须尽快确定故障位置以恢复系统正常运行。基于阻抗的故障定位算法是目前最常用的,但它们容易受如故障电阻和线路之间的相互耦合等多种误差源影响,并且有关互耦或复杂网络配置的信息也不能直接用于基于阻抗的故障定位算法。因此,提出了一种基于系统故障状态仿真模拟的短路点自动定位方法,利用电力系统仿真软件和控制出力软件整合所有可用的系统信息,从而准确地定位短路故障的发生位置。最后,通过仿真测试验证了所提方法的有效性和精确性,能够很好地应对诸如相互耦合和故障电阻等因素干扰。

Abstract:

Transmission lines are a vital part of power system and are prone to a variety of short-circuit faults. It is imperative to identify the fault location to restore the system as quickly as possible for maintaining the system integrity. Impedance-based fault location algorithms are most commonly used but they are prone to several sources of errors such as fault resistance and mutual coupling between the lines and may not provide accurate results in the presence of complex network configurations such as three-terminal lines. Though the information about mutual coupling or knowledge of complex network configuration is known, they cannot be directly used in impedance-based fault location algorithms. A novel automated generic framework for model-based fault location approach is proposed which uses the power system model to overcome the shortcomings of impedance-based fault location methods. A combination of power system simulation software and a control and processing software provide the flexibility to be able to incorporate all the available information about the system to accurately estimate the fault location. Furthermore, the key insights to implement the proposed framework in an effective and efficient manner are provided by using reduced equivalent circuits.