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| Research on the characteristic of a harmonic self-eliminating rectifier |
| Sun Jiawei |
| State Grid Baoding Electric Power Supply Company, Baoding, Hebei 071000 |
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Abstract A large number of harmonics are generated in the production of high-power electrolytic aluminum, which seriously affects the power quality of power system. In order to eliminate the harmonic generated in the process of aluminum electrolysis, a kind of converter with the function of harmonic self-elimination is proposed in this paper. On the basis of traditional 12-pulse rectifier, this converter adds a harmonic current reinjection loop to eliminate harmonics by controlling the amplitude and phase of the injected current. Firstly, the topology of high power rectifier is introduced, and the generation of harmonics is simulated. Then, the relationship between the level number of injected current and the effect of harmonic elimination is analyzed. Taking the 9-level current injected harmonic self-elimination rectifier as the research object, the working principle and control method of zero-crossing switch and the harmonic elimination and current of multi-level current injected rectifier are analyzed. Finally, the simulation results of harmonic elimination of 9-level current reinjection converter are given under the environment of Matlab/Simulink, and it is verified that the harmonic content of harmonic self- cancellation rectifier is lower than 4% of the national standard when operating at different power levels.
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Received: 30 August 2019
Published: 20 March 2020
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2020, Vol. 21 
