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Three-phase two-bridge arm three-level mixed rectifier

A hybrid rectification and rectifier technology, applied in wind power generation, electrical components, high-efficiency power electronic conversion, etc., can solve the problems of high harmonic content of current injected into the grid side, low work efficiency, low power factor, etc., and improve current tracking ability , cost saving, high efficiency effect

Pending Publication Date: 2018-04-06
CHINA THREE GORGES UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: how to use the hybrid rectifier to solve technical problems such as low working efficiency of the traditional three-phase voltage type PWM rectifier, high harmonic content of the injected current at the grid side, and low power factor

Method used

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  • Three-phase two-bridge arm three-level mixed rectifier
  • Three-phase two-bridge arm three-level mixed rectifier
  • Three-phase two-bridge arm three-level mixed rectifier

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Embodiment Construction

[0044] Such as figure 2 As shown, the present invention is a three-phase two-arm three-level hybrid rectifier, e a 、e b 、e c are the ideal three-phase grid voltage; i a i b i c is the grid-side input current, i a1 i b1 i c1 is the AC side input current of the two-arm asymmetrical PWM rectifier, i a2 i b2 i c2 is the input current of the AC side of the three-phase diode rectifier, L and R are the filter inductance and resistance respectively; S 1 , S' 1 , S 2 , S' 2 , S 3 , S' 3 , S 4 , S' 4 To form a rectifier Z 1 Eight IGBT switch tubes of the asymmetric rectifier bridge; C 1 、C 2 is the upper and lower capacitors on the DC side, i n is the mid-point current, R L is the DC side load; D 1 、D 2 、D 3 、D 4 、D 5 、D 6 To form a rectifier Z 2 The six diodes of the three-phase rectifier bridge, L d , S a for the rectifier Z 2 The boost inductor and switch tube of the medium boost circuit; U dc is the output voltage of the DC side.

[0045] Such as ...

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Abstract

The invention discloses a three-phase two-bridge arm three-level mixed rectifier. The mixed rectifier includes two rectifiers Z1, Z2, a voltage sampling circuit, a current sampling circuit, a protection circuit, a zero cross detection circuit, a DSP control module, a PWM drive circuit, wherein the rectifier Z1 includes eight IGBT switch tubes, two asymmetrical three-level rectifier bridge each ofwhich is composed of an upper and a lower capacitor, and a filter. The rectifier Z2 is a traditional three-phase boost PFC circuit. The mixed rectifier herein uses the aforementioned structure and adopts the double closed-loop control technology in such a manner that the voltage outer-loop uses PI control and the voltage inner-loop uses passivity-based control and constant frequency PWM control. The mixed rectifier is advantaged by the capability of suppressing harmonic waves that are injected to a power grid, realizing AC side current sinusoidal and unity power factor, and higher current tracking capability and stable system control, and can fast track the given value of a DC side voltage. According to the invention, the mixed rectifier is applicable to scenarios such as high-voltage DC transmission converter stations, wind power and solar energy development, electric vehicle charging piles that are characterized by high requirements and high efficiency.

Description

technical field [0001] The invention relates to the field of electric energy conversion, in particular to a three-phase two-bridge-arm three-level hybrid rectifier. Background technique [0002] With the rapid development of power electronic technology, power electronic equipment is increasing in daily life and work production, such as various high-quality application power supplies, electric traction locomotives and other electrified railway equipment, frequency conversion speed control systems, various new energy power generation, etc. , these devices are connected to the power grid through power electronic converters, and the performance of power electronic converters directly affects the power quality of the connected power grid and the working environment. As an important technology to improve system performance and improve system efficiency, multi-level conversion technology has received more and more research from academia and industry in high-power fields such as new...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M7/219H02M7/06H02M1/14H02M1/42
CPCH02M1/14H02M1/4216H02M1/4225H02M7/06H02M7/217H02M7/219H02M1/007Y02E10/76Y02B70/10
Inventor 马辉危伟赵金刚冯茂
Owner CHINA THREE GORGES UNIV
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