DC side voltage balance control method for three-level converter

A DC side voltage and balance control technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of difficult modulation of midpoint voltage balance, and achieve the effect of simple implementation

Active Publication Date: 2019-12-24
西安班特利奥能源科技有限公司
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming that the midpoint voltage balance of the DC side of the three-level converter in the prior art is difficult to modulate, and to provide a method for controlling the voltage balance of the DC side of the three-level converter

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  • DC side voltage balance control method for three-level converter
  • DC side voltage balance control method for three-level converter
  • DC side voltage balance control method for three-level converter

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Embodiment Construction

[0032] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circums...

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Abstract

The invention discloses a DC side voltage balance control method for a three-level converter. The method comprises the following steps of: S1, acquiring a DC side positive bus capacitor voltage and aDC side negative bus capacitor voltage, S2, acquiring an inductive current and acquiring the direction of the inductive current through the inductive current, S3, controlling on or off of a fourth switching tube to adjust the DC side positive bus capacitor voltage and the DC side negative bus capacitor voltage in the case when the DC side positive bus capacitor voltage is higher than the DC side negative bus capacitor voltage and the direction of the inductive current is positive; and S4, controlling on or off of a first switching tube to adjust the DC side positive bus capacitor voltage and the DC side negative bus capacitor voltage in the case when the DC side positive bus capacitor voltage is lower than the DC side negative bus capacitor voltage and the direction of the inductive current is negative. According to the method, hardware cost does not need to be increased, SPWM modulation is still adopted, the implementation mode is simple, and output of normal three-level voltage is not affected in the process of balancing a neutral-point voltage.

Description

technical field [0001] The invention belongs to the field of three-level converters, and relates to a DC side voltage balance control method of a three-level converter. Background technique [0002] Three-level topology has been widely used in many fields such as flexible AC power transmission, grid reactive power compensation and absorption, and high-voltage (medium-voltage) AC motor drive. Compared with the two-level topology, the three-level topology has the following advantages: 1) Under the same switching frequency, the harmonic content of the output voltage and current is greatly reduced; 2) The voltage borne by the power tube is half of the bus voltage; 3) The power tube Low switching losses. [0003] In order to make the three-level inverter operate safely and reliably, it must be ensured that the midpoint potential is half of the DC side voltage. There are mainly three methods for DC-side voltage balance in the existing three-level topology: 1) using an additional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487
CPCH02M7/487
Inventor 沈敏泉
Owner 西安班特利奥能源科技有限公司
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