Comprehensive anti-interference measurement method for three-phase asymmetric transmission line parameters in strong interference environment
In order to improve the measurement accuracy of transmission line parameters in strong interference environment,a comprehensive anti-interference measurement method for capacitance parameters and impedance parameters of three-phase asymmetric transmission line is proposed.First,in the power-frequency voltage source,the capacitance parameters are measured by using the third harmonic components of the voltage and current measured in two ends of the transmission line to avoid power frequency interference.Second,the influence of the capacitance current is considered to correct the impedance measurement model of the line.Finally,in the non-power frequency voltage source,the non-power frequency increments of the measured voltage and current are used to measure the impedance parameters to simultaneously suppress the power frequency and non-power frequency interferences existing in the transmission line effectively.The simulation results show that the proposed method can effectively improve the parameter measurement accuracy of three-phase asymmetric line in the strong interference environment compared with the existing methods.
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