Abstract
Abstract This paper presents a novel converter which can reduce the harmonics like the conventional multipulse converters with input three phase transformer. To reduce total harmonic distortion of input current and improve the weight and size of converters, it is suggested to use multi-pulse rectifiers with an electronic phase shift. The basic module is a 6-pulse rectifier on fully controlled switches with the reverse blocking ability. Switching frequency either coincides or is twice the power frequency. The proposed solutions allow refusing from the electromagnetic phase-shifting devices (power transformers or auto-transformers) and thereby significantly reduce the weight of the device. Unlike power factor correction systems with high-frequency modulation, the proposed converters are significantly different, as they have better electromagnetic compatibility and the virtual absence of dynamic switching losses of power switches.
Highlights
The vast amount of consumed electrical energy is used in a modified form
Converters connected to AC power are characterized by several parameters: power consumption, power factor and harmonic content of consumed current from the sine wave
Using the considered principle of the multipulse rectifier construction with a phase shift, which is formed by means of control, we can represent a generalized functional diagram of the rectifier (Fig. 4)
Summary
The vast amount of consumed electrical energy is used in a modified form. This is due to the requirements of consumers to change the characteristics of the voltage supply: frequency, shape or volume. Modern power semiconductor devices can increase the switching frequency above the 50th harmonic of the mains frequency and up to several tens of kilohertz (depending on the power and voltage). The need to ensure EMC, leads to the use of input filters in AC/DC converters, designed to operate at frequencies of a few to hundreds of kilohertz, the application of structural measures to reduce the level of symmetrical interference in a power supply. Such measures worsen the technical and economic characteristics of high power factor correction.
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