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Compensation method for nonlinear region of three-level T-type inverter

A non-linear region, compensation method technology, applied in electrical components, AC power input to DC power output, output power conversion devices and other directions, can solve the problem of output voltage distortion and other issues

Active Publication Date: 2020-11-10
FUZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] In order to solve the defects and insufficient problems of the prior art, the present invention aims at the inverter nonlinear effect of the output voltage distortion of the three-level T-type inverter

Method used

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  • Compensation method for nonlinear region of three-level T-type inverter
  • Compensation method for nonlinear region of three-level T-type inverter
  • Compensation method for nonlinear region of three-level T-type inverter

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Embodiment Construction

[0077] In order to make the features and advantages of this patent more obvious and easy to understand, the following specific examples are given together with the accompanying drawings and described in detail as follows:

[0078] In this embodiment, the circuit diagram of the three-level inverter is as follows figure 1 As shown, the output voltage distortion caused by the dead zone and the voltage drop of the switching device, that is, the nonlinear zone problem, can be compensated by AOVPWM, OMPWM and arctangent function. In order to realize the compensation of the nonlinear zone of the three-level T-type inverter, First define the following relationship:

[0079]

[0080] Among them, v * xn is the pole voltage reference value, v xn is the actual output pole voltage, δv xn is the output voltage error, and the above three variables are cycle average values;

[0081] δv xn = δv xn_sw +δv xn_DT

[0082] Among them, δv xn_sw is the voltage drop generated by the swit...

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Abstract

The present invention provides a three-level T-type inverter nonlinear area compensation method. The method comprises a PWM technology based on carriers and an inverter nonlinear effect compensation method. In the provided PWM method, the neutral point voltage control (NPVC) and the controllability of the output voltage linearity are considered. The method provided by the invention solves the nonlinear compensation problem, and the NPVC method is provided to achieve neutral point balance.

Description

technical field [0001] The invention relates to the field of inverters, in particular to a compensation method for a non-linear region of a three-level T-type inverter. Background technique [0002] Multilevel pulse width modulation (PWM) voltage source inverters (VSIs) have attracted much attention due to their advantages over two-level VSIs, such as better harmonic characteristics, smaller dv / dt and higher efficiency. Among many multilevel inverters, three-level inverters, such as neutral-point clamped topology and T-type topology, have been widely used due to their relatively simple control and mature technology. [0003] However, the inverter nonlinearity leading to output voltage distortion on a three-level topology is more complex than in a two-level topology due to the increased number of switching states. The effect of inverter nonlinearity on dead time, parasitic capacitance and voltage drop across switching devices can distort the output voltage of the inverter an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M1/38
Inventor 金涛张可苏文聪
Owner FUZHOU UNIV
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