Four-level rectifying circuit
A rectifier circuit, four-level technology, applied in electrical components, conversion devices for converting AC power input to DC power output, and output power, etc., can solve the problems of high voltage stress and large current harmonics, and achieve fewer switching devices. , the effect of many output levels and simple circuit structure
Inactive Publication Date: 2019-04-19
TSINGHUA UNIV
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Problems solved by technology
However, when the voltage level is further increased, problems such as large current harmonics and high voltage stress will be encountered, and it is necessary to further increase the level number
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[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0022] The four-level rectification circuit proposed according to the embodiment of the present invention will be described below with reference to the accompanying drawings.
[0023] figure 2 It is a schematic diagram of the result of the four-level rectification circuit of an embodiment of the present invention.
[0024] Such as figure 2 As shown, the four-level rectification circuit 10 includes: a three-phase AC power supply 100 , first to third capacitors 200 , first to third rectification inductors 300 and first to third...
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The invention discloses a four-level rectifying circuit, which comprises a three-phase AC power supply, capacitors from the first to the third, rectifying inductors from the first to the third and four-level single-phase circuits from the first to the third, wherein one end of each rectifying inductor is connected with a corresponding output end of the three-phase AC power supply; an AC input endof each four-level single-phase circuit is connected with the other end of each rectifying inductor; and a first DC output end of each four-level single-phase circuit is connected with a positive electrode of the first capacitor, a second DC output end of each four-level single-phase circuit is connected with a positive electrode of the second capacitor, a third DC output end of each four-level single-phase circuit is connected with a positive electrode of the third capacitor, a fourth DC output end of each four-level single-phase circuit is connected with a negative electrode of the third capacitor, so as to output levels from the first to the fourth. The four-level rectifying circuit has the advantages of simple circuit structure, large number of output levels, few used switching devicesand the like, and is a economical and practical multi-level rectifying circuit suitable for high-voltage occasions.
Description
technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a four-level rectifier circuit. Background technique [0002] Due to the shortcomings of large current harmonics, low power factor, and large current stress, the traditional diode uncontrolled rectifier circuit has gradually failed to meet the relevant standards of power quality. [0003] In order to better meet the needs of the power grid, PWM (Pulse Width Modulation, pulse width modulation) rectifiers have significant advantages such as small current harmonics, high power factor, fast dynamic response, and small DC voltage ripple. occasions have been widely used. With the increase of the voltage level, the traditional two-level PWM rectifier gradually develops into multi-level, among which the three-level VIENNA rectifier has received extensive attention and in-depth research, such as figure 1 As shown, not only the voltage stress is small, but also less s...
Claims
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IPC IPC(8): H02M7/217
CPCH02M7/2173
Inventor王奎郑泽东李永东
OwnerTSINGHUA UNIV