Reliability and benefit evaluation method of distribution network project based on the whole life cycle

Abstract

The invention relates to the technical field of distribution network benefit evaluation, in particular to a distribution network project reliability benefit evaluation method based on the whole life cycle. In the whole life cycle, considering the maximum power supply capacity constraints of the distribution network, combined with the coincidence value of each load point of the distribution network every year, the annual reliability technical indicators of the system before and after the project construction are calculated, and the annual reliability improvement value is obtained. Based on the whole life The annual reliability improvement value within the cycle, combined with the power outage loss cost of the distribution network user unit, calculates the reliability benefits brought by the construction of the distribution network project in the entire life cycle. On the basis of quantitative evaluation of distribution network reliability, combined with unit power outage loss costs, a distribution network reliability benefit evaluation model is established to calculate the reliability benefits of distribution network projects; and the change of system load in the whole life cycle is considered , which can more accurately and reasonably evaluate the reliability benefits of the distribution network project's entire life cycle.

Description

technical field [0001] The invention relates to the technical field of distribution network benefit evaluation, in particular to a distribution network project reliability benefit evaluation method based on the whole life cycle. Background technique [0002] Power grid reliability is an important issue that needs to be considered during the operation of the power system, and it represents the ability of the power system to meet the electricity demand of users. With the steady development of the national economy and the gradual improvement of people's living standards, the demand for electricity in the whole society is also increasing, and the requirements for the reliability of power supply in the power system are also getting higher and higher. Studies have shown that about 80% of blackouts are caused by distribution system failures, which means that the distribution system has the greatest impact on the reliability of power supply for users. Therefore, there is an urgent ...

AI Technical Summary

Problems solved by technology

In actual engineering calculation, the analytical method is relatively easy to implement, but the commonly used failure mode consequence analysis method needs to analyze the power outage accident caused by each component failure. For the distribution network with complex structure, the enumeration workload is huge, and some improved methods For example, the minimum path method and the minimum cut set method have certain difficulties in solving the algorithm, and the division criteria and boundary conditions are not clear enough when the network equivalent law is used to divide the equivalent area.

[0004] Aiming at the distribution network reliability benefit assessment problem, the traditional method is also based on the unit outage loss cost, but the calculation of the unit outage loss cost is very complicated, and it is necessary to conduct a large number of investigations and analyzes on power users to determine the different types of users in different power outage situations. At present, there is no survey data on user power outage losses in my country

In addition, the traditional method usually does not consider the change of network load in the whole life cycle, but only calculates the reliability benefit in the first year, because the load in the first year is relatively low, the reliability benefit may not be obvious, and a project is in the It has been able to bring benefits throughout the years of its life. As the years increase and the load increases year by year, the reliability benefits will also be different. That is, the reliability benefits of subsequent years need to be calculated sequentially, and cannot be simply calculated based on the first year. calculations for other years, which lead to inaccurate reliability benefit calculations

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