Three-phase bridge PWM converter and active power filter formed by same

A power filter, three-phase bridge technology, applied in active power filtering, AC network to reduce harmonics/ripple, AC power input conversion to DC power output, etc. System interference and other problems, to achieve the effect of improving the impact of the environment, increasing the life of the device, and high system reliability

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A power filter, three-phase bridge technology, applied in active power filtering, AC network to reduce harmonics/ripple, AC power input conversion to DC power output, etc. System interference and other problems, to achieve the effect of improving the impact of the environment, increasing the life of the device, and high system reliability

CN103607133AInactive Publication Date: 2014-02-26CSG SMART SCI&TECH CO LTD

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[0059] like figure 1 As shown, an embodiment of the three-phase bridge PWM converter of the present invention includes: a first bridge arm circuit, including: a first IGBT T1 and a second IGBT T2 connected in series, and the collector of the first IGBT T1 is connected to the positive pole of the capacitor Cd , the emitter of the second IGBT T2 is connected to the cathode of the capacitor Cd, the emitter of the first IGBT T1 is used as the first current output terminal ica, the anode of the first diode D1 is connected to the collector of the first IGBT T1, and the first diode D1 The cathode is connected to the emitter of the first IGBT T1, the anode of the second diode D2 is connected to the collector of the second IGBT T2, and the cathode of the second diode D2 is connected to the emitter of the second IGBT T2;

[0060] The second bridge arm circuit includes: the third IGBT T3 and the dead IGBT T4 in series, the collector of the third IGBT T3 is connected to the positive pole...

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Abstract

The invention discloses a three-phase bridge PWM converter. The three-phase bridge PWM converter comprises a first bridge arm circuit, a second bridge arm circuit and a third bridge arm circuit which have the same connecting mode. One end of each bridge arm circuit is connected with the positive electrode of a capacitor, and the other end of each bridge arm circuit is connected with the negative electrode of the capacitor. Each bridge arm circuit comprises two IGBTs which are in series connection, and each IGBT is in parallel connection with a diode. The invention further discloses an active power filter which is provided with the three-phase bridge PWM converter. By means of the three-phase bridge PWM converter and the active power filter formed by the same, harmonic waves and idle work with the variable frequency and size can be compensated, the defect of the active filter can be overcome, and the compensation characteristic better than that of the active filter can be obtained.

Description

technical field [0001] The present invention relates to the field of power equipment manufacturing, in particular to a three-phase bridge PWM (pulse width adjustment) converter; the invention also relates to an active power filter with the three-phase bridge PWM converter . Background technique [0002] With the development of modern industry, the nonlinear load in the power system has increased greatly. Various nonlinear and time-varying electronic devices such as inverters, rectifiers and various switching power supplies are widely used, and their negative effects are becoming more and more obvious. Power electronic devices such as inverters, rectifiers, and various switching power supplies inject a large number of harmonics into the grid during switching operations, which seriously distorts the voltage and current waveforms in the grid. Power electronic devices have become the most important source of harmonics in the power grid, and the research on the harmonic polluti...

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Application Information

Patent Timeline

26 Feb 2014

Publication

CN103607133A

IPC: H02M7/5387; H02J3/01

CPC: Y02E40/40; Y02E40/20

Inventors: 张军; 周凤学