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Modulation method for reducing switching loss of current source PWM rectifier

A modulation method and technology of switching loss, applied in the direction of AC power input conversion to DC power output, electrical components, high-efficiency power electronic conversion, etc., can solve the problems of low efficiency, large loss, complex modulation strategy, etc. The effect of reducing conduction loss and shortening commutation time

Inactive Publication Date: 2017-09-05
CHONGQING UNIV OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems of complex modulation strategy, large loss and low efficiency of the existing current-mode PWM rectifier, and provide a modulation method for reducing the switching loss of the current-mode PWM rectifier, which can Effectively shorten the commutation time between devices and reduce switching losses

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  • Modulation method for reducing switching loss of current source PWM rectifier
  • Modulation method for reducing switching loss of current source PWM rectifier
  • Modulation method for reducing switching loss of current source PWM rectifier

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Embodiment

[0050] Example: see figure 1 , figure 2 , a modulation method for reducing the switching loss of a current-source PWM rectifier, wherein the current-source PWM rectifier includes a power grid side (AC side) filter structure composed of an inductance L and a capacitor C to filter out grid side current harmonics, And suppress the effect of the harmonic voltage on the AC side. Mainly by the full control switch tube S 1 , S 2 , S 3 , S 4 , S 5 and S 6 The three-phase bridge arm composed of; where, S 1 and S 2 form the first bridge arm, S 3 and S 4 Form the second bridge arm, S 5 and S 6 form the third bridge arm; at S 1 , S 3 , S 5 The output terminals are connected in series with diodes D 1 、D 3 、D 5 , at S 2 , S 3 , S 6 The input terminals are respectively connected in series with diodes D 2 、D 3 、D 4 , so that the voltage reverse blocking capability of the device can be improved. consists of a diode D and two discrete inductors L dc The output side c...

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Abstract

The invention discloses a modulation method for reducing switching loss of a current source PWM rectifier. The current source PWM rectifier comprises a grid-side filter structure formed by an inductor L and a capacitor C, a three-phase bridge arm mainly formed by fully-controlled switching tubes S1, S2, S3, S4, S5, and S6 and an output-side circuit structure formed by a diode D and two discrete inductors Ldc. The modulation method particularly comprises the following steps: 1) a space vector of three-phase CSR current is obtained; 2) three-phase grid voltage is divided according to 30-DEG / sector; 3) an ampere-second balance method is used for calculating the actuation time of a corresponding effective vector state; 4) an actuation order of corresponding current vectors is determined; 5) the control pulse signals of each fully-controlled switching tube are obtained; and 6) the control pulse signals obtained in the fifth step are subjected to state signal distribution, and switching control on each fully-controlled switching tube is thus carried out. The current commutating time between devices can be effectively shortened, and the switching loss is reduced.

Description

technical field [0001] The invention relates to the technical field of PWM rectification, in particular to a modulation method for reducing switching loss of a current-type PWM rectifier. Background technique [0002] A large number of power electronic converters are used in modern power grids. Their strong nonlinear characteristics inject a large amount of harmonic and reactive power into the power grid, causing problems such as harmonic pollution and reactive power loss, and reducing the power quality of the power grid. Among them, the harmonic pollution of the power grid has become one of the most important problems affecting the power quality of the power grid. At the moment when the whole people pay attention to environmental protection issues, people have realized the importance of purifying the power system environment. [0003] As the interface between the power grid and the load equipment, the rectifier device plays a key role in the power quality of the power grid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/32
CPCH02M1/32H02M7/219H02M1/0054Y02B70/10
Inventor 李山汪鹏郭强肖蕙蕙
Owner CHONGQING UNIV OF TECH
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