Time-varying failure rate simulation model of transmission lines and its application in power system risk assessment considering seasonal alternating meteorological disasters

2016 ◽  
Vol 10 (7) ◽  
pp. 1582-1588 ◽  
Author(s):  
Jian Wang ◽  
Zhe Li ◽  
Xiaofu Xiong ◽  
Shijie Weng ◽  
Ning Zhou
Keyword(s):  
Risk Assessment ◽  
Power System ◽  
Simulation Model ◽  
Failure Rate ◽  
Transmission Lines ◽  
Time Varying ◽  
System Risk ◽  
Meteorological Disasters

A power system risk assessment using bootstrap technique

2010 ◽  
Author(s):  
Siti Rohani Kasim ◽  
Muhammad Murtadha Othman ◽  
Nor Fadhilawati Abd Ghani ◽  
Ismail Musirin
Keyword(s):  
Risk Assessment ◽  
Power System ◽  
Bootstrap Technique ◽  
System Risk

Analysis on Lightning Withstand Level of Back Striking Flashover for Double-Circuit Transmission Line

2014 ◽  
Vol 1070-1072 ◽  
pp. 1050-1055 ◽  
Author(s):  
Shi Jun Xie ◽  
Jian Ming Li ◽  
Yu Han Jiang ◽  
Yu Zhang
Keyword(s):  
Power System ◽  
Simulation Model ◽  
Transmission Lines ◽  
Physical Mechanism ◽  
Transient Simulation ◽  
Lightning Strike ◽  
Significant Component ◽  
The Earth ◽  
Model Combining ◽  
The Stability

The double-circuit transmission lines have already been the significant component of power system. Because of the symmetric insulation of the two circuits, the case that both circuits trip out often happens when the tower suffer lightning strike. And it harms the stability of power system and causes serious impacts to power equipments. In this paper, an electric-magnetic transient simulation model was established. Using this model, combining the analysis of physical mechanism of back striking trip-out, the influences of earth resistance, height of tower and length of insulator on the lightning withstand level of back striking (LWLBS) were clarified. The LWLBS of high tower is much low, therefore the relative high tower should be paid more attention to defense the back striking. Reducing the earth resistance and increasing the length of insulator can both upgrade the LWLBS observably. Especially, reducing the earth resistance can enhance the effect of upgrading the LWLBS by increasing the length of insulator.

Analysis of a Transformer Time-Varying Outage Model for Operational Risk Assessment

2013 ◽  
Vol 732-733 ◽  
pp. 993-998
Author(s):  
Ke Tian ◽  
Da Hai You ◽  
Yi Long Li ◽  
Kai Pan ◽  
Ke Wang
Keyword(s):  
Risk Assessment ◽  
Markov Process ◽  
Failure Rate ◽  
Process Model ◽  
Weather Condition ◽  
Operational Risk ◽  
Degree Of Polymerization ◽  
Gas Analysis ◽  
Time Varying ◽  
Operating Condition

Firstly, the operating mechanism in developing process of transformer internal latent fault and external accessory fault is analyzed. Then, dissolved gas analysis (DGA) outcome and average degree of polymerization (DP) are used as an indicator to classify transformers operating condition, the multi-state Markov process model based transformers operating condition is proposed to estimate the internal failure rate. According to the method of weather condition classification, the external accessory failure rate model is proposed by considering the influence of weather change. A time-varying transformer outage model for operational risk assessment is proposed by using the multi-state Markov process to estimate the time-varying failure probability. Finally, a numerical is presented.

scholarly journals Wind Power System Risk Assessment Based on Fuzzy Clustering and Copula Function Modeling

2017 ◽  
Vol 09 (04) ◽  
pp. 352-364 ◽  
Author(s):  
Mingshun Liu ◽  
Lijin Zhao ◽  
Liang Huang ◽  
Wenhao Han ◽  
Changhong Deng ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Power System ◽  
Wind Power ◽  
Fuzzy Clustering ◽  
Copula Function ◽  
System Risk ◽  
Wind Power System
Sign in / Sign up

Export Citation Format

Share Document