Studies on analysis methods of multi-harmonic sources in AC/DC hybrid transmission system

The analysis methods of multi-harmonic sources in AC/DC hybrid transmission system are researched.Based on the comparison of the current analysis methods of harmonics in high voltage direct current(HVDC) transmission system,a new method named modulation and iterative harmonic analysis(MIHA) method for multi-harmonic sources system is proposed.In this method the modulation theory is integrated with iterative harmonic analysis(IHA),so not only the nonlinear behavior of a converter station is rationally simulated and the interface between AC and DC systems is resolved,but also the calculation of harmonics can be more accurate by means of iteration.