Abstract
Controlled rectifiers of three-phase voltage based on a transformer with a rotating magnetic field where secondary N-sections winding represents N-phase shape like circular winding and semiconductor commutator can be represented by a full bridge scheme. That is why these rectifiers may be controlled by the pulse-phase methods developed for the three-phase bridge rectifiers. One of the new control methods is the step-chord method that will improve the quality of the output voltage and electromagnetic compatibility with the power supply network in comparison with classical control methods. Regulation of rectified voltage Ud while using this method consists in commutative control of the power switches of the commutator various number of the transformer circular winding sections to rectifier common buses. In the process, the step-to-step crossing is accompanied by an Ud-amplitude pulsation change, that causes signal deviation of the control system in these change-point environment, which causes occurrence of low frequency components in the output voltage. The modified step-chord control method, which eliminates the generating of low frequency harmonics by step-to-step crossing is proposed in this article.
Keywords
Transformer with rotating magnetic field, controlled rectifier, control method, quality of rectified voltage.
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