Method for implementing soft DTR (Dynamic Thermal Rating) technology based on semi-parameter adjustment model

Abstract

The invention discloses a method for implementing a soft DTR (Dynamic Thermal Rating) technology based on a semi-parameter adjustment model. The method comprises the following steps of S100, decoupling a state variable according to characteristics of a measurement equation; S200, according to the decoupled state variable, estimating voltage and current carrying capacity of two ends of a power transmission line in a continuous time bucket on the basis of the measurement equation; S300, taking an estimated value of the current carrying capacity in the step S200 as a known quantity and carrying out refined estimation on resistance of the power transmission line; S400, obtaining a temperature track of the power transmission line through a known resistance value sequence in the step S300; S500, obtaining the carrying current of the power transmission line and a temperature sequence through the step S200 and the step S400 and estimating an equivalent environment parameter in a heat balance equation of the power transmission line. The method solves the influence of a system error in measurement data on precision of an estimated result, and effectiveness for temperature estimation of the power transmission line is improved.

Description

technical field [0001] The invention relates to a method for realizing soft DTR technology based on a semi-parameter adjustment model, and belongs to the technical field of electric power systems. Background technique [0002] The utilization of land resources in the eastern part of my country is becoming increasingly tense. Increasing the allowable temperature of conventional transmission lines can increase the transmission capacity of existing conventional lines, and help to improve the grid load peak and short-term overload capacity under N-1 accidents. Less construction of lines can also reduce the investment of new lines, and the social and economic benefits are significant. Therefore, in order to reduce the number of new transmission corridors, fully tap the technical potential of existing transmission lines, and improve the load capacity of transmission lines, it has become increasingly urgent. Among them, the dynamic thermal rating technology, Dynamic Thermal Rating, ...

AI Technical Summary

Problems solved by technology

However, the core technology of soft DTR lies in the effective estimation of the transmission line temperature in a continuous period of time. Experimental data show that only random errors are considered in the measurement equation, and when the least squares estimation method is directly used to track the transmission line temperature, when When the measured data, especially the observed values ​​of active power contain large systematic errors or gross errors, the solution of the model will appear unstable, manifested as small fluctuations in the measured values ​​of active power, which will lead to fluctuations in the solution value of the transmission line temperature. big change

When the error of the temperature estimation solution is far beyond the engineering acceptance range, it will seriously restrict the popularization and application of soft DTR technology

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