Electromagnetic voltage regulating soft starting device without harmonic

Abstract

An electromagnetic voltage regulating soft starting device without harmonic comprises a high voltage primary side winding W1, a low-voltage secondary side winding W21, an anti-parallel-connection thyristor component K1, a harmonic control secondary side winding W20 and a harmonic control circuit T1. When the electromagnetic voltage regulating soft starting device without the harmonic is used as a motor soft starting and speed control operation function, the high voltage winding is in serial connection with an electricmotor winding. When an alternating current (AC) voltage is exerted for the high voltage winding, AC flows in the high voltage winding, and therefore a magnetomotive force is formed. Through electromotive force adjustment, working current of the electricmotor winding is changed to achieve soft starting and speed adjusting operation. The harmonic control circuit controls opening and closing of an insulated gate bipolar translator (IGBT) according to a harmonic compensation command signal sent by a control center to generate corresponding compensation current which controls the secondary side winding through harmonic, and the harmonic of a system is controlled. The electromagnetic voltage regulating soft starting device without the harmonic has the advantages that the harmonic control circuit is added to treat the harmonic generated in the soft starting, and power grid quality is improved.

Description

Technical field [0001] The invention relates to the field of electric transmission, particularly the field of high-voltage soft start. Background technique [0002] In terms of motor soft start, with the widespread use of power electronic devices, the problem of harmonics has become increasingly prominent. At present, the main power electronic soft-start devices include (1) transistor series solid-state soft-start technology; (2) variable frequency soft-start technology; (3) magnetic control voltage-regulated soft-start technology. [0003] Among them, the transistor series solid-state soft-start technology is relatively mature in the low-voltage range, and the high-voltage part has a higher requirement for the consistency of thyristor parameters due to the problem of voltage equalization in the thyristor series, so it is less applied. And when the thyristor works in the phase shift mode, harmonics will be generated, which will cause pollution to the power grid. [0004] The variab...

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Problems solved by technology

However, the power factor of this kind of starting method is low, and there is a certain amount of harmonic pollution.

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