Study On Seismic Resilience Evaluation Method Of Power Facilities

Electricity is the driving force for social development and production,and it is also the basis for people's normal life and work.Due to the frequent occurrence of earthquake disasters,the concept of "earthquake resilience in urban and rural areas" is becoming increasingly important.Although foreign countries have begun to study the resilience of power systems and have achieved certain results,on the whole,the domestic research on the power system earthquake resilience is still in the initial stage.How to evaluate the earthquake resilience of power facilities and methods to improve resilience need further research.In view of this,this paper does the following research on the earthquake resilience of power facilities:(1)The current progress and results of domestic and foreign resilience research are introduced,and the definition,evaluation system and methods of improving resilience of various scholars in different fields is summarized;the current research progress on resilience related to power systems made at home and abroad is summarized.(2)Taking electrical equipment and buildings as examples,the earthquake damage of power facilities is analyzed;the meaning of resilience of power facilities is analyzed,and the influencing factors that affect the resilience of power facilities are given from a macro perspective of engineering and non-engineering,and the weight of each factor of the resilience of power facilities is determined by questionnaire survey,on the basis of this,a macro-resilience evaluation method for all factors of power facility engineering resilience and non-engineering resilience was preliminarily established,and trial calculation was conducted.(3)By analyzing the outdoor equipment and wiring mode of substation,the functional link of substation is simplified.According to the seismic damage data of Wenchuan earthquake,the relationship between the failure rate of high-voltage electrical equipment in the simplified functional link and the actual functional failure rate of substation is statistically analyzed.Combining with the statistical relationship between the actual functional failure rate and seismic intensity of substation,a semiempirical and semi-theoretical function of substation functional failure rate is established,which takes the failure rate of high-voltage electrical equipment in the simplified functional link of substation as independent variable;based on the statistical relationship between substation recovery time and seismic damage index,a semiempirical and semi-theoretical recovery time function with seismic damage index asidentification parameter is established;based on the above function failure rate function and recovery time function,the substation engineering resilience loss function is constructed.(4)The substation engineering resilience is divided into four levels: high,medium,low and very low;the resilience loss value of the substation engineering based on the resilience loss function is proposed;according to the earthquake damage situation of 103 sample substations in Mianyang,Guangyuan,Deyang and other places in the Wenchuan earthquake Calculated the resilience loss value,looking for the mapping function of the engineering resilience loss value and the engineering resilience index,calculated the engineering resilience index,and established the correspondence between the substation engineering resilience index and the resilience grade,according to the structural form of the building,the seismic resistance of the electrical equipment The substation is divided into 7 categories,the engineering resilience index is calculated,and the resilience rating is evaluated.Finally,taking 220 KV and above substations in Liangshan area as an example,the seismic resilience rating of 17 substations was evaluated.