Reliability Assessment Method for Power Grid Security and Stability Control Devices Based on Weibull Fault Rate Fitting

Abstract

The stability control device is an important part of the safety and stability control system of the power system. The stability control devices cooperate through certain control logic, so that the stability control system can realize the functions of prevention control, emergency control, and recovery control, to guarantee the safe and stable operation of the power system. The existing reliability assessment methods of the stability control devices mainly rely on the analysis of the failure principle of the devices and the statistics of the historical operation data, which cannot make an effective prediction of the changing trend of the failure rate of the stability control devices. In this paper, we propose a Weibull fault rate fitting-based reliability assessment method for power grid control devices, which is based on a function fitting method to fit the parameters of the fault rate function of the control devices and use the obtained parameters to calculate the reliability evaluation index of the control devices. The method has important engineering significance for the production and deployment of stabilization control devices and the design improvement of grid stabilization control systems.

Keywords

• Stability control device
• parameter fitting
• Weibull distribution
• reliability assessment