Power transmission line current-carrying capacity boundary dynamic evaluation method

Abstract

The invention discloses a power transmission line current-carrying capacity boundary dynamic evaluation method. The method comprises the following steps: (1) inputting sensor information and environmental meteorological information collected by a power transmission line into a power transmission line digital twinning model; (2) calculating a current-carrying capacity boundary; (3) calculating a steady-state value and a temperature rise value of the wire temperature after current transition; (4) judging whether the steady-state value of the conductor temperature exceeds a preset temperature value or not to determine whether the current-carrying capacity boundary needs to be reduced or not to recalculate the steady-state value of the conductor temperature, and outputting the reduced current-carrying capacity boundary as a reference; (5) calculating the maximum conductor sag corresponding to the maximum current-carrying capacity of the power transmission line; (6) judging whether the maximum conductor sag corresponding to the maximum current-carrying capacity of the power transmission line meets the requirement of the power transmission line for the safe distance to the ground; and (7) obtaining the final current-carrying capacity boundary of the power transmission line. On the premise of ensuring stable operation of the system and equipment safety, the credibility and accuracy oftransmission capacity evaluation of the power transmission line are improved.

Description

technical field [0001] The invention belongs to the dynamic capacity-increasing technology of transmission lines, and in particular relates to a dynamic evaluation method for the current carrying capacity boundary of transmission lines. Background technique [0002] With the rapid growth of my country's economy, the demand for electricity consumption continues to increase, the load of electricity consumption continues to increase, and the demand for power transmission is also increasing. According to the "National Power Supply and Demand Situation Analysis and Forecast Report 2019-2020", as of the end of 2019, the country's full-caliber power generation installed capacity was 2.01 billion kilowatts, a year-on-year increase of 5.8%; The electricity consumption of the whole society increased by 4.5% year-on-year. The National Development and Reform Commission and the State Grid Corporation of China have listed the capacity-enhancing technology of overhead transmission lines a...

AI Technical Summary

Problems solved by technology

However, my country often adopts relatively conservative fixed meteorological boundary conditions in the calculation of ampacity, which seriously underestimates the current-carrying capacity of conductors, resulting in a great waste of resources; on the other hand, this conservative meteorological condition does not represent the most severe Due to weather conditions, transmission lines will still face security threats at certain times

Images