| The technology of the electric power industry has gotten considerable progress in recent years.The country's political and economic activities,the normal and orderly operation of the society,and the people's food,clothing,housing and transportation are all inseparable from reliable power supply.The requirements of the government and the National Energy Administration to the power supply bureau or power company are: to ensure the continuous and stable power supply,and to provide high-quality power.Therefore,substation plays a very important role,which is the most important part of power grid.As technologies such as computer,communication,digitization and automation developed more and more rapidly,power grid enterprises is changing the direction to digitalization and electronization.“Big Data” and “Internet of Things” are representatives of emerging technologies,which has been a part of the digital grid,so the digital grid is becoming more and more advanced.Correspondingly,the old integrated automation system in substation(IASS)is unable to keep up with technological development and bound to be eliminated.Old substations usually have the following problems,including a)backward integrated system design,b)single and slow collection of data,c)incomplete access to remote control and local monitoring background,d)station equipment cannot be fully monitored,e)different types of secondary devices have barriers and are not fully connected,f)lacking of overall flexibility and other disadvantages.In order to solve the above shortcomings,it is necessary to upgrade its protection equipment,automation equipment,dispatching control system,local monitoring and back-office equipment to enhance the comprehensive linkage and coordinated control capabilities of the integrated automation system,so that the operation of substation will be more efficient and reliable,w hich plays important and positive role in decreasing the frequency and time in power failure and raises the profile of the power grid enterprises at the same time.This article firstly introduces the background and significance of the research on the comprehensive automation system of substations,and introduce the research progress in the field of IASS based on the foreign and domestic academic achievements.Then,four typical architectures of integrated automation system in the view of patterns and features are analyzed in detail.Then,combining with engineering experience,the article introduces the main functions of the integrated automation system of the substation,as well as the overall goal and content of the integrated automation system transformation.Next,after analyzing the existing problems of the IASS,take upgrading 110 k V pilot project of IASS for example,this article takes the following steps:(1)studying and designing the overall structure combined with existing mature technology and mainstream manufacturers' products;(2)studying and designing some modules such as the relay protection device configuration,automation equipment configuration,fault rate recording device on the ground of the type and principle of relay protection used in the substation.Finally,the technical scheme of transformation is formed which is suitable for the actual situation of the substation.Moreover,a new optimization model and method is proposed in this paper based on analytic hierarchy process(AHP).In this method,the decision-maker first decomposes the complex system into multiple levels according to the characteristics;then,the relevant impacts of each level The elements are listed one by one;Then,after comparing and scoring the influencing factors at the same level by specific scaling method,the weight of each key indicator is calculated and obtain the evaluation score of the scheme in further calculation.Thus,the optimal construction plan is determined,which can be used as a reference for the personnel of the production technology department in engineering practice.Lastly,this article introduces and analyzes the situation after IASS is upgraded using the proposed scheme and shows the results of on-site debugging and operation,and then analyzes in detail the results of the 110 k V substation after the comprehensive transformation,including the improvement of power quality indicators and management Benefits and economic benefits and social benefits,etc.Good electrical indicators and social and economic benefits confirm the effectiveness of the comprehensive self-reconstruction scheme and method designed.The actual technical renovation project shows that scientific and effective comprehensive automatic system transformation can reduce the defect rate of secondary equipment and reduce the frequency and time of power outages;before the comprehensive automatic transformation of the pilot substation,there were deficiencies such as aging of the secondary equipment and poor reliability,which could no longer meet the power operation requirements.after the comprehensive automatic transformation,the protection devices of the whole station resume normal operation functions,and the input rate of relay protection devices reach 100%.After the transformation,the accuracy of three-phase voltage and current sampling has been significantly improved,and the balance of three-phase voltage and current has been significantly improved.At the same time,the comprehensive automatic transformation has enhanced the level of substation operation and maintenance,and enhanced the intelligence of equipment.At least 9,000 yuan operation and maintenance costs can be saved every year.The reduction of power outage time after the comprehensive self-renovation is also conducive to improving the reliability of power supply,thereby creating more social value. |
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