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Method for controlling midpoint potential of direct-current bus of three-level inverter

A technology of a DC bus midpoint, three-level inverter, applied in the field of inverter research, can solve problems such as failure to prove, lack of theoretical analysis, etc.

Inactive Publication Date: 2012-07-25
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are so many advantages, researchers have started to study since the 1990s, and there are related experimental results in recent years, but the existing literature shows that the research work in this area lacks rigorous theoretical analysis to prove that in the modulation wave The effectiveness of the method of injecting zero-sequence components, and it has not been proved that several injections of zero-sequence components and how to reasonably select the amplitude and phase of the injection can effectively control the fluctuation of the midpoint potential

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  • Method for controlling midpoint potential of direct-current bus of three-level inverter
  • Method for controlling midpoint potential of direct-current bus of three-level inverter
  • Method for controlling midpoint potential of direct-current bus of three-level inverter

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Embodiment Construction

[0021] refer to figure 1 , between the three-phase power supply 1 and the non-linear load 2, a series diode clamping three-level inverter 3 is connected. The diode-clamped three-level inverter 3 consists of a DC side energy storage element C 1 and C 2 , equivalent loss resistance R 1 and R 2 , Voltage source type PWM inverter, in which the DC side energy storage element is generally composed of power capacitors connected in series and parallel, and the voltage source type PWM inverter is composed of fully controlled devices such as IGBT, GTO, etc. One end of the line inductance 31, 32 and 33 is connected in series with the A, B, C three-phase voltage source PWM converter, and the other end is connected in parallel between the three-phase power supply 1 and the nonlinear load 2, and the selection of its parameters mainly depends on the voltage The switching frequency of the source PWM converter.

[0022] For the convenience of description, the three-phase voltage of the po...

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Abstract

The invention discloses a method for controlling midpoint potential of a direct-current bus of a three-level inverter, which comprises two parts, namely the first part is a traditional method: subtracting a direct-current voltage (udc1+udc2) from a reference value Uref to obtain an error signal, and adding the error signal to i1-d obtained after dp decoupling of a three-phase load current to control the total voltage of two dividing capacitors; and the other part is the control method provided by the invention: adding the calculated proper amplitude and the zero sequence component of the phases, namely fine adjustment instructions into the instruction voltage before adjusting.

Description

technical field [0001] The present invention relates to the research field of inverters, in particular to a method for controlling the midpoint potential of the DC bus bar of a diode-clamped three-level inverter. The zero-sequence component is used to control the fluctuation of the midpoint potential. Background technique [0002] Since the 1970s, energy and environmental protection have gradually become one of the world's mainstream concerns. With the development of society, more and more industrial and living fields have an increasing demand for medium and high-voltage large-capacity inverters year by year, such as in steel rolling, cement, papermaking, shipbuilding and other industrial fields and high-speed railways, urban subways, electric vehicles, etc. Medium and high-voltage large-capacity frequency conversion speed regulation systems in public transportation fields, as well as power active filters widely used to solve reactive power and harmonic pollution of power g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5395H02M1/12
Inventor 何英杰刘进军王新宇
Owner XI AN JIAOTONG UNIV