Reliability And Economic Program For Distribution Network And Its Indices Precontrolling

The distribution system directly connect with the users, it is a very important part in theprocess of supplying and distributing electric energy from the entire power system includingelectric generating, transmitting and distributing to the general users. According to theincomplete statistics, about80percent of power outage is caused by distribution networkfailures. Therefore, to enhance the research of the distribution network reliability is the needfor the development of future electricity market, and also an important measure to ensure thequality of power supply and electric industry modernization. It plays an important role topromote and improve the production technology and management level of the electricindustry, to increase the economical and social benefits, and to construct and renovate thedistribution network. Therefore, this paper was based on the research of the distributionreliability evaluation method and the analysis of reliability indices, acquired the technique andmanagement measures of improving the distribution reliability indices at the present stage.The scientific and meticulous research about the plan of distribution network feederautomation switch and its investment benefit analysis, and the precontrolling management ofreliability indices had been done. The main work was as follows:1．In view of the limitations of ignoring the interruption frequency and inadequateanalysis of failure consequences during the traditional distribution network switchoptimization, the new optimal switching devices model was presented. The model wasmultiply targeted as investing the minimum cost of automation switch, achieving theminimum average annual interruption frequency and the minimum interruption duration ofthe system, constrainted by the availability rate of load node electricity supply. This papercombined with the specific technical programs of feeder automation in Guangzhou powersupply bureau, fully considered the relationship of diverse switches associated with time andspace, applied differential evolution algorithm to solve the Pareto front efficiently. Meanwhile,taking the feeder in Guangzhou as a example to validate the efficiency and the engineeringapplication value of the proposed model.2．To confirm the economical and reasonable feeder automation switch planning project,studied the economic benefit evaluation method of switch planning project. The method wasbased on the economical principles of investment benefit，took the reliability investment andthe decreased outage caused by the investment as the output and input cost of project fundingrespectively, then compared and analyzed the dynamic investment recovery period and the netpresent value ratio of alternative projects, to confirm the project with the optimal economic benefit. Finally, through the numerical results of the feeder in Guangzhou, validated theproposed solution can reflect the economic benefits of the alternative projects directly.3．Aiming at the problems such as the blindness and subjectivity in the reliability indicesprecontrolling of electric enterprise, the reliability indices precontrolling method waspresented based on the weighted linear distribution and combination weighting method. Themethod divided the outage indices into planning outage indices and failure outage indiceswhich combined with the diversity of factors such as engineering construction of the grid,operation of equipment, network structure level, historical index data, and so on. At the sametime, the method could reasonably arrange each step during the whole process of the indicesprecontrolling, and provided the theoretical guidance and decision support on the reliabilityindex management for electric enterprise. Based on the conclusion, developed the software ofthe reliability indices precontrolling to achieve the engineering conversion of the results inthis article.