Energy Consumption Simulation Analysis And Energy Saving Optimization Of 110 KV Outdoor Substation In Chengdu

With the development of China’s national economy,the power industry has gradually crossed into the world’s advanced level,and the number of substations required to be built in each region is gradually increasing.Compared with the national 500 kV substations,750kV substations and provincial 220 kV substations,the number of 110 kV substations at the local level is greater and the potential for energy saving and consumption reduction is also greater.The research results can not only be used as a guide for the construction of new substations in this region,but also have certain reference value for the formulation of substation energy-saving design standards,and have important theoretical significance for guiding the energy-saving optimization of 110 kV substation buildings in this region.This paper takes a 110 kV outdoor substation in Chengdu as the research object,and selects the influencing factors such as building orientation,window wall ratio,exterior wall heat transfer coefficient,exterior window heat transfer coefficient,roof heat transfer coefficient,exterior window integrated shading coefficient,interior set temperature,interior relative humidity,etc.The main work and conclusions are as follows:(1)Firstly,the building energy consumption simulation model of the substation is established through De ST software,and the energy consumption simulation analysis is carried out.The single-factor sensitivity analysis method is used to determine the degree of the influence each factor has on the building air conditioning energy consumption of the substation in the following order:indoor set temperature>exterior wall heat transfer coefficient>indoor relative humidity>roof heat transfer coefficient>window wall ratio>exterior window integrated shading coefficient>exterior window heat transfer coefficient>building orientation.(2)Secondly,the orthogonal test form is designed by SPSS,there are 8 influencing factors,and each factor has 3 level numbers,leading to a total of 27 sets of data.Through range analysis and ANOVA,27 sets of data are analyzed,and the influence of various influencing factors on the energy consumption of substation air conditioning is as follows:indoor set temperature>indoor relative humidity>exterior window integrated shading coefficient>exterior wall heat transfer coefficient>window wall ratio>roof heat transfer coefficient>exterior window heat transfer coefficient>building orientation.The optimal combination includes building orientation being due east,window-wall area ratio being 0.2,heat transfer coefficient of external wall being 1.6 w/(m~2.k),heat transfer coefficient of external window being 3.2 w/(m~2.k),heat transfer coefficient of roof being 1.0 w/(m~2.k),comprehensive shading coefficient of external window being 0.3,indoor set temperature being 30℃,indoor relative humidity being 80%.The optimal combination simulation result is 309.57 k W.h/m~2,compared with the original substation building,the energy consumption difference of air conditioning is 195.16 k W.h/m~2,and the energy saving rate is 38.67%.The area ratio of window wall,heat transfer coefficient of external wall,heat transfer coefficient of roof,comprehensive shading coefficient of external window,indoor setting temperature and indoor relative humidity are the height significant influencing factors of the substation,the heat transfer coefficient of exterior windows is a significant factor,and the orientation of the building is an insignificant factor.(3)Finally,the energy-saving optimization strategies in this paper are proposed as follows:1.Under the condition that the normal operation of electrical equipment is ensured,the indoor set temperature and indoor relative humidity are appropriately increased,and for every 1℃increase in the indoor set temperature of the building,21.958 k W.h/m~2 of air conditioning energy can be saved,with a change rate of 4.31%.Each 1%increase in the indoor relative humidity of the building can save air conditioning energy consumption by1.04 k W.h/m~2,with a change rate of 0.21%.2.When optimizing the design of the building envelope,priority should be given to the heat transfer coefficient of exterior wall.For every0.1 w/(m~2.k)change in the heat transfer coefficient of exterior wall,the energy consumption of air conditioning can be saved by 7.70 k W.h/m~2,with a change rate of 1.53%.3.Focus on the comprehensive shading coefficient of the exterior window,set the active exterior shading,which can maximize the situation of avoiding direct sunlight in summer and using solar radiation in winter,and the change value of air conditioning energy consumption is 1.40k W.h/m~2 with a change rate of 0.28%for every change of 0.1 of the comprehensive shading coefficient of the exterior window;4.The window wall ratio to the west,south and north should be reduced as much as possible,and the window wall ratio to the east should be increased.