Method for estimating total supply capability of 220KV loop ring network

Abstract

The invention discloses a method for estimating total supply capability of a 220kV looped ring network. The method comprises the following steps of extracting a grid structure of the 220kV looped ring network, determining network node numbers and branch numbers of the grid structure, and numbering nodes and branches of the grid structure; reading a grid structure parameter, a load parameter and a voltage amplitude and a phase angle of a balance node; carrying out group expansion operation on a predetermined load population to obtain an initial load population, and carrying out variation and cross evolution operations on the load population; carrying out power flow calculation and verification on the 220kV looped ring network in a normal running mode and a (N-1) running of each branch; and updating the population according to self-adaptive degree, and outputting a load scheme of the total supply capability. According to the method, the total supply capability is estimated by taking a district as a minimum unit, and the total supply capability of the 220kV looped ring network is rapidly and accurately figured out when the (N-1) condition is met.

Description

Technical field [0001] The invention relates to the field of power grid power supply capability evaluation, and in particular to a method for evaluating the maximum power supply capability of a 220kV loop loop network. Background technique [0002] With the development of my country's economy, the growth of power load has accelerated significantly, resulting in power quality, power supply capacity, and power supply reliability that cannot meet the power needs of users, forming many power supply bottlenecks. At present, the urban power grid has basically been completed. It is very difficult to obtain the site of the new substation and the underground passage of the new feeder from the planning and reconstruction of the system. Therefore, it is very important to study the maximum power supply capacity of the power grid without building underground passages for new power stations and feeders. [0003] The maximum power supply capacity of the power grid (TotalSupplyCapability, TSC) re...

AI Technical Summary

Problems solved by technology

The second stage is to use the DC power flow model or linear programming method to solve the maximum power supply capacity of the power grid. The disadvantage is that the influence of voltage and network loss on TSC is ignored, resulting in a large error

[0005] In addition, when the existing methods solve the maximum power supply capacity of the power grid, the complete power grid model or simplified model is generally used for calculation. The calculation is slow, and even numerical calculation problems may occur; and the simplified model makes the error of the result too large, and the application value is greatly reduced

Images