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Current source type three-level direct-current converter and control method thereof

A technology of current source type and control method, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as insufficient research, achieve simple control method, small electromagnetic interference, The effect of simple topology

Inactive Publication Date: 2020-04-17
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The multi-level current source DC converter is an imminent new problem with the challenges of the DC grid, the development of the current source converter, and the application requirements of high power. It has a good application prospect and development trend. However, the The research is not enough, and there are few mature product applications. It is both theoretical and practical to analyze this and find a solution.

Method used

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  • Current source type three-level direct-current converter and control method thereof
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  • Current source type three-level direct-current converter and control method thereof

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Embodiment 1

[0032] Figure 6 Shown is the topological diagram of the three-level current source DC converter of the present invention. It consists of a constant current source I, power switches S1, S2, S3, S4, a balanced inductance L and a load. Two power switches are connected with common collectors to form a bridge arm: the collector of the first power switch S1 is connected with the collector of the third power switch S3 to form bridge arm 1, the common collector connection point is point A, and the second The collector of the power switch S2 is connected to the collector of the fourth power switch S4 to form the second bridge arm. The common collector connection point is point B, and the common collector point A of the first power switch S1 and the third power switch S3 is connected to the second bridge arm. A balance inductor L is connected between the common collector point B of the second power switch S2 and the fourth power switch S4, the emitter of the first power switch S1 is c...

Embodiment 2

[0036] A control method for a current source type three-level DC converter, comprising the following steps:

[0037] The driving pulse of the first power switch S1 and the second power switch S2 is blocked, the first power switch S1 and the second power switch S2 are blocked, the driving pulse of the third power switch S3 and the fourth power switch S4 is triggered, and the third power switch S3 and the When the fourth power switch S4 is turned on, the current i of the constant current source I is equally divided into two paths, respectively from the positive electrode, that is, the common collector connection point A of the first power switch S1 and the third power switch S3, through the shunt branch 3: The power switch tube under the bridge arm, that is, the third power switch S3 to the third power switch S3 and the fourth power switch S4 share the emitter connection point D to the negative pole of the constant current source I, and the shunt branch 4: the balance inductor L ...

Embodiment 3

[0039] A control method for a current source type three-level DC converter, comprising the following steps:

[0040] The driving pulses of the second power switch S2 and the third power switch S3 are blocked, the second power switch S2 and the third power switch S3 are blocked, the driving pulses of the first power switch S1 and the fourth power switch S4 are triggered, and the first power switches S1 and The fourth power switch S4 is driven to be turned on, and the current i of the constant current source I is equally divided into two paths, respectively from the positive pole, that is, the first power switch S1 and the third power switch S3 common collector connection point A, through the shunt branch 1: The power switch tube on bridge arm 1, that is, the first power switch S1 to the common emitter connection point C of the first power switch S1 and the second power switch S2, flows through the load, passes through the emitter of the third power switch S3 and the fourth power...

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Abstract

The invention discloses a current source type three-level direct-current converter and a control method thereof. The converter comprises two bridge arms, a balance inductor, a current source and a load, wherein the collecting electrodes of every two of four reverse blocking type power switch tubes are connected to form the two bridge arms. According to the invention, by using different switch modes, the multi-level current output is achieved, the equalization inductor and the bridge arm power switch tube bear 1 / 2 current source current, and the current sharing control correction is performed by using a redundant switch mode, so that the low switching stress, the low ripple characteristic and the high equivalent switching frequency are achieved, the circuit structure is simple, the number of devices is small, control is easy, and reliability is high; and the current source type three-level direct-current converter can be widely applied to low-voltage and large-current power electronic multi-level power conversion occasions.

Description

technical field [0001] The invention belongs to power electronic multilevel converters, in particular to a current source type three-level DC converter and its control method. Background technique [0002] The DC power grid is a DC network composed of converters connected in multiple grids and radials. It has the characteristics of large transmission capacity, high power quality, good system stability, high redundancy, and flexible operation mode. It can be used on a large scale. The advantages of renewable energy consumption, energy optimal allocation, regional power transmission and power regulation have become increasingly prominent, and have become an important technical direction for the development of smart grids, network energy, and ship integrated power systems. DC converter is the key technology of DC grid. [0003] According to the difference of the DC side energy storage components, the converters can be divided into two categories: voltage source converters (vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M1/44H02M1/38
CPCH02M1/38H02M1/44H02M7/483
Inventor 姬凯陈廷杨许晓晖黎波徐明
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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