Capacitor voltage balance control method of three-phase T-type three-level dual-output inverter

A capacitive voltage, three-level technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the unbalanced voltage of power switching devices, output voltage, and current harmonic content Large, unbalanced capacitor voltage and other problems, to achieve the effect of strict derivation, smaller harmonic content of current waveform, and suppression of capacitor voltage fluctuation

Pending Publication Date: 2022-04-26
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

The three-phase T-type three-level dual-output inverter combines the advantages of three-level high-efficiency and dual-output applications, and has great development potential and a wide range of applications. However, in the working process, there are two DC The unbalanced voltage of side capacitors leads to unbalanced voltage of power switching devices, large output voltage and current harmonic content, and shortens the life of capacitors.

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  • Capacitor voltage balance control method of three-phase T-type three-level dual-output inverter
  • Capacitor voltage balance control method of three-phase T-type three-level dual-output inverter
  • Capacitor voltage balance control method of three-phase T-type three-level dual-output inverter

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Embodiment Construction

[0167] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0168] The capacitor voltage balance control method of a three-phase T-type three-level dual-output inverter of the present invention can effectively control the balance of two capacitor voltages on the DC side, and the topology of the three-phase T-type three-level dual-output inverter Such as figure 1 shown. Depend on figure 1 It can be seen that the three-phase T-type three-level dual-output inverter consists of a DC side capacitor C 1 , capacitance C 2 , 18 power switching devices and 18 diodes, the three-phase T-type three-level dual-output inverter has A-phase, B-phase and C-phase bridge arms, each of the A-phase, B-phase and C-phase bridge arms Each phase arm consists of 6 power switches S x1 ~S x6 and 6 diodes D x1 ~D x6 Composition, where, x∈{A, B, C}; DC side capacitance C 1 The voltage across both ends is defined a...

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Abstract

The invention relates to a capacitor voltage balance control method of a three-phase T-type three-level dual-output inverter, which is characterized in that on the basis of a carrier PWM (Pulse Width Modulation) method of the three-phase T-type three-level dual-output inverter, the influence of midpoint current on capacitor voltage is analyzed; the invention provides a method for deriving a neutral-point average value current mathematical expression in different intervals according to two groups of modulation wavelength division conditions, and further deriving a condition for realizing capacitor voltage balance. The modulation degrees of the upper and lower groups of modulation waves are reasonably configured, so that the integral value of the midpoint average current in one period is zero, capacitor voltage balance is realized, the harmonic content of the output voltage and current of the three-phase T-type three-level dual-output inverter is reduced, the waveform quality is improved, and the simulation result shows the effectiveness of the control method.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a capacitor voltage balance control method for a three-phase T-type three-level dual-output inverter. Background technique [0002] In recent years, T-type three-level inverters have received widespread attention due to their superior performance, such as low conduction loss and uniform heat distribution. Compared with two-level inverters, three-level inverters have many advantages, such as lower harmonic distortion rate and higher efficiency. The dual AC output system has been widely used in fields such as electric vehicles, rail traction, and wind power generation. The core of the dual AC output system is the dual output inverter. The three-phase T-type three-level dual-output inverter combines the advantages of three-level high-efficiency and dual-output applications, and has great development potential and a wide range of applications. However, in the working process, there ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M7/483H02M1/12
CPCH02M7/53873H02M7/483H02M1/12
Inventor 王秀云薛彪吴雪东袁帅王汝田刘闯蔡国伟陈继开郭东波张嘉伟
Owner NORTHEAST DIANLI UNIVERSITY
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