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The commonly used double-tuned filter and triple-tuned filter in HVDC transmission system can usually be equivalent to the parallel single-tuned filters. The parameters of doubletuned filter and triple-tuned filter can be obtained from the parameters of parallel single-tuned filters by equivalent transformation. In addition, there is no model of double-tuned filter or triple-tuned filter in some common simulation software, which brought some difficulties to the harmonic analysis of HVDC. Therefore, it is significant to transform the double-tuned filter and the triple-tuned filter to the parallel single-tuned filters equivalently. Based on the circuit equivalence of double-tuned filter, triple-tuned filter and single-tuned filter, a parameters equivalent transformation method for AC filters in HVDC system is proposed. The forward and backward equivalent transformation formulas between the parameters of double-tuned filter, triple-tuned filter and parallel single-tuned filters are given respectively. Finally, examples are given to verify the feasibility and validity of the parameters equivalent transformation method for AC filters in HVDC system.
Inspec keywords: power harmonic filters; passive filters; HVDC power convertors; harmonic analysis; HVDC power transmission
Subjects: d.c. transmission; Power convertors and power supplies to apparatus; Other power apparatus and electric machines; Power supply quality and harmonics