Accurate measurement of the transmission line parameters is essential for the stable operation of the power system. However, the existing methods are limited in their engineering applicability due to the assumption of...
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Accurate measurement of the transmission line parameters is essential for the stable operation of the power system. However, the existing methods are limited in their engineering applicability due to the assumption of parameter symmetry. The solution method for transmission line equations based on Laplace transform also leads to significant complexity in derivation and poor generalizability. To overcome these limitations, this study proposes a new method for measuring the zero-sequence distributionparameters of partial parallel double-circuit transmission lines based on a distributed parametermodel. The method employs phase-mode transformation to represent the voltage and current at both ends of the lines through forward and backward voltage/current modes. Combined with the chain parameter matrix theory, expressions for the line impedance matrix and admittance matrix are derived without parameter simplifications. The proposed method achieves line parameter measurement under both power outage and live line conditions based on synchronous measurement. The measurement accuracy and robustness of the proposed method are validated through PSCAD/EMTDC simulations, and further demonstrated through successful field live line measurement tests on two 500 kV partial parallel double-circuit transmission lines. The measurement results indicate that the proposed method can measure the distributionparameters of the partial parallel double-circuit lines precisely. Furthermore, the proposed method is extended to a universal measurement method for the distributionparameters of n-circuit transmission lines and the phase parameters of asymmetric transmission lines.
For EHV/UHV transmission lines, the effects of distribution capacitance of lines on the parameter measurement can't be neglected. A new method of measuring the zero sequence parameters of double-circuit EHV/UHV tr...
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ISBN:
(纸本)9781457705472
For EHV/UHV transmission lines, the effects of distribution capacitance of lines on the parameter measurement can't be neglected. A new method of measuring the zero sequence parameters of double-circuit EHV/UHV transmission lines with mutual inductance based on distribution parameter model and GPS technology is proposed. The distribution parameter model of double-circuit transmission lines is established and the independent measurement cases for both live line and no live line measurement are given. The calculation formulae for solving the zero-sequence parameters of lines are derived. The parameter measurement for double-circuit EHV/UHV transmission lines from 300 km to 1600 km is simulated and compared with the traditional measurement method. Simulation results have validated that the new method can greatly improve the accuracy of the parameter measurement of EHV/UHV transmission lines.
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