Automatic Calculation and Simulation of Time-Varying Failure Rate of Digital Relay Protection Device

Abstract

Efficiency is an important indicator of risk assessment, but the failure rate changes with time, which makes risk assessment very difficult. Traditional methods often only measure the steady-state and static indicators of relay protection. The traditional method often only measures the steady-state and static indicators of the relay protection, or directly uses the RiskWeibull analysis system to perform reliability analysis on the relevant data. However, this method can only perform quantitative static analysis on the data. Once the system is disturbed, its reliability will be affected. Analysis is not possible. Since the relay protection device has the possibility of malfunction and refusal at the same time, in order to distinguish, the risk is introduced into the reliability evaluation of the relay protection device to achieve the purpose of considering the possibility and consequences of its failure at the same time. Based on the traditional method, this paper proposes a method to calculate the time-varying failure rate of the relay protection device by using the support vector machine model, which improves the influence of hidden risks on the power grid relay protection, and not only realizes the scientific hidden danger evaluation, risk rating. It is of great significance for the development of power grids to evaluate the consequences of failures and to make the transmission lines operate safely and stably.

Analysis of the impact of inverter distributed generation on 10kV power grid relay protection

“…Inverter distributed generation has more obvious advantages than non-inverter distributed generation [2] . The inverter device with DC-AC inverter device can capture the best grid-connected moment and minimize the adverse effects of gridconnected, so the soft grid-connected technology has been widely used and unanimously praised in recent years [3] . With the continuous development of power electronics technology, soft grid-connected technology and inverter-based distributed power will be further developed and applied.…”