Converter neutral-point voltage balance control method based on SHEPWM

A control method and voltage balancing technology, 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 inability to effectively eliminate low-order harmonics

Inactive Publication Date: 2016-09-28
ANHUI UNIVERSITY
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Problems solved by technology

[0003] Although the specific harmonic elimination control method of the three-level neutral point clamped converter can effectively eliminate some specific low-order harmonics and reduce the switching loss of power devices, it is rarely balanced with the control of the neutral point voltage. combine
At present, most of the neutral point voltage balance control methods based on control algorithms are space vector modulation strategies, but this modulation strategy cannot effectively eliminate specific low-order harmonics while controlling the neutral point voltage balance.

Method used

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  • Converter neutral-point voltage balance control method based on SHEPWM
  • Converter neutral-point voltage balance control method based on SHEPWM
  • Converter neutral-point voltage balance control method based on SHEPWM

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Embodiment Construction

[0036] An optimal control algorithm for pulse width modulation of a three-level neutral-point clamped converter for controlling neutral-point voltage balance, comprising the following steps:

[0037] ① Establish the mathematical model of the specific harmonic elimination control method for the three-level neutral point clamped converter.

[0038] The three-level single-phase voltage waveform satisfies 1 / 4 cycle symmetry. According to the Dirichlet theorem, the waveform can be decomposed into the following Fourier series:

[0039] U A N ( ω t ) = A 0 2 + Σ n = 1 ∞ [ A n s i n ( ...

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Abstract

The present invention relates to a converter neutral-point voltage balance control method based on SHEPWM. The method comprises the following steps: 1, building a three-level neutral-point clamped converter specific harmonic wave elimination control method mathematics model, and solving non-linear transcendental equations; 2, performing the vector quantization of the three-level neutral-point clamped converter SHEPWM; and 3, dynamically transforming the switch state of the SHEPWM, and replacing the small vector corresponding to the SHEPWM with another small vector which is paired with the small vector corresponding to the SHEPWM. The converter neutral-point voltage balance control method based on SHEPWM is configured to replace the small vector corresponding to the SHEPWM with another small vector which is paired with the small vector corresponding to the SHEPWM through dynamically transforming the switch state of the SHEPWM while eliminating the special low-order harmonics so as to effectively control the neutral-point voltage balance, improve the quality of the output waveform and decrease the distortion of the total harmonic distortion on the premise without influence of eliminating the line voltage special harmonics.

Description

technical field [0001] The invention relates to a pulse width modulation optimization control algorithm of a midpoint clamped converter, in particular to a SHEPWM-based converter midpoint voltage balance control method. Background technique [0002] The specific harmonic elimination control method of the three-level neutral point clamped converter properly controls the pulse width modulation voltage waveform of the converter through the optimal selection of the switching time, so that there are no certain harmonics in the output voltage of the converter. Specific (low order) harmonics reduce the switching frequency of power devices and reduce the switching losses of power devices. [0003] Although the specific harmonic elimination control method of the three-level neutral point clamped converter can effectively eliminate some specific low-order harmonics and reduce the switching loss of power devices, it is rarely balanced with the control of the neutral point voltage. com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M1/12
CPCH02M7/487H02M1/12
Inventor 胡存刚王群京胡军陆寅陈权
Owner ANHUI UNIVERSITY
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