Identification method of complete parameters of double-loop lines on the same pole and double-loop line based on pmu measurement

Abstract

The present invention relates to a PMU-based method for identifying the complete parameters of double-circuit lines on the same pole with short lines, including the following steps: Step 1. According to whether the lines of double-circuit lines on the same pole with short lines are symmetrical, respectively establish the same-phase sequence and Impedance model of double-circuit lines on the same pole with short lines in non-phase sequence; step 2, establish the parameter identification objective function of multi-time PMU measurement based on the least square method; step 3, select N time points and N+1 time points respectively The PMU measurement at time is substituted into the parameter identification objective function established in step 2 to obtain the corresponding parameter identification result α N 、α N+1 ;For the same-phase sequence line, set the initial value N=2; for the non-sequence line, set the initial value N=4; Step 4, determine α in step 3 N 、α N+1 Is it satisfied|α N ‑α N+1 |≤λ, if satisfied, exit the cycle and complete the parameter identification; if not satisfied, set N=N+1, return to step 2 and recalculate until the parameter identification is completed. The invention can accurately and quickly obtain the impedance parameters of the double-loop line on the same pole of the short line.

Description

technical field [0001] The invention belongs to the technical field of power system parameter identification, and relates to a method for identifying complete parameters of double-circuit lines on the same pole with short lines, in particular a method for identifying complete parameters of double-circuit lines on the same pole with short lines based on PMU measurement. Background technique [0002] With the development of the economy, the requirements for the power system are getting higher and higher, which also makes the power grid more and more complex. As a carrier for transmitting electric energy, transmission lines are an integral part of the power grid. It is of great significance to study the related issues of transmission lines for the analysis and calculation of power systems. Transmission line parameters are the basic data for short-circuit current calculation, relay protection setting, transient stability calculation, power flow calculation and fault location me...

AI Technical Summary

Problems solved by technology

Due to the mutual impedance asymmetry of double-circuit lines paralleled on the same pole without transposition, the estimation error of reactive power of double-circuit lines will greatly exceed the allowable range when estimating its state

At present, there is no relevant research on the analysis of the impedance parameters of the double-circuit line on the same pole without transposition of the short line. Therefore, the present invention studies the impedance parameters of the double-circuit line on the same pole without transposition of the short line. Lay the foundation for realizing the state estimation and accurate power flow calculation of double-circuit lines paralleled on the same pole for short lines

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