DC power system

Abstract

The invention discloses a DC power system. The DC power system comprises an AC power distribution module, a rectification module and a DC power distribution module, wherein an input end of the AC power distribution module is connected with an AC power supply, an output end of the AC power distribution module is connected with an input end of a circuit breaker module via an AC input wiring unit, anoutput end of the circuit breaker module is electrically connected with an input end of the rectification module, an output end of the rectification module is electrically connected with a busbar module, the busbar module is connected with a load unit, the rectification module comprises a power factor correction (PFC) and a DC / DC control unit, an output end of the PFC control unit is electricallyconnected with an input end of the DC / DC control unit, the output end of the rectification module is also connected with an input end of the DC power distribution module, an output end of the DC power distribution module is connected with the busbar module, and an input-output end of the rectification module is connected with an input-output end of the monitoring module. By the DC power system, the harmonic pollution can be reduced, the electric energy quality is improved, meanwhile, the high-power electric energy can be improved, and the demand of each occasion is satisfied.

Description

technical field [0001] The invention relates to the field of power supply technology, in particular to a DC power supply system. Background technique [0002] In ordinary power electronic devices, the rectifier circuit is usually composed of an uncontrollable diode rectifier followed by a capacitor filter. The rectifier bridge capacitor filter circuit is a combination of nonlinear elements and energy storage elements. Although the input AC voltage is sinusoidal, the rectifier diode conducts only near the peak value of the AC voltage sine wave, so the input current waveform is severely distorted, pulse-like, and contains a large number of harmonics. Harmonics do not do work, and will cause harmonic pollution and reduce power factor, greatly affecting the quality of electric energy. [0003] The use of single-stage change technology can reduce the pollution and influence of harmonics and improve the quality of electric energy. However, the use of single-stage change technolo...

AI Technical Summary

Problems solved by technology

Although the input AC voltage is sinusoidal, the rectifier diode conducts only near the peak value of the AC voltage sine wave, so the input current waveform is severely distorted, pulse-like, and contains a large number of harmonics

Harmonics do not do work, and will cause harmonic pollution and reduce power factor, greatly affecting the quality of electric energy

[0003] The use of single-stage change technology can reduce the pollution and influence of harmonics and improve the quality of electric energy. However, the use of single-stage change technology is suitable for low-power occasions, and it can only achieve 1KV power at most. Harmonic distortion can only achieve 25%. The single-stage PFC controller with single-stage change technology is nakedly exposed to the grid, and its service life is reduced. At the same time, the ripple of PFC is 100Hz wave as high as 3-100V, which is easy to cause Misreading, even the phenomenon of comparator failure

Images