For access to this article, please select a purchase option:
IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.
Your recommendation has been sent to your librarian.
The UHVDC converter station is equipped with AC filters of different types and parameters, and its overall impedance-frequency characteristics are relatively complex. It can easily cause harmonic amplification by interaction with the grid impedance in some frequency range. For further analysis, the grid background harmonic impedance is needed. The equivalent harmonic analysis circuit for grid background harmonic impedance estimation is given. The 500 kV AC bus of UHVDC converter station is used as the PCC point. The harmonic voltage of AC bus and the harmonic current of converter transformer are taken as measurement data, and the data forms a measurement matrix. Then a 500kV grid background harmonic impedance estimation method based on different operating conditions of the converter station is proposed. The measurement matrix is decomposed by singularity value decomposition method, and the grid background harmonic impedance with grid background harmonic voltage is solved by least squares method. Finally, a PSCAD simulation model was built. The simulation results demonstrated the validity and practicality of this method.
Inspec keywords: singular value decomposition; power system harmonics; harmonic analysis; power supply quality; HVDC power convertors; HVDC power transmission; power grids
Subjects: Control of electric power systems; Power supply quality and harmonics; Power convertors and power supplies to apparatus; d.c. transmission; Interpolation and function approximation (numerical analysis)