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Third harmonic injection method and device suitable for circulating current control of current converter

A circulating current control and converter technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, power transmission AC network, etc., can solve the problems that the effect needs to be further improved, and achieve reduction and related current, Effect of improving consistency and increasing rated voltage

Pending Publication Date: 2022-04-19
XIDIAN POWER RECTIFIER XIAN +1
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Problems solved by technology

However, the effect of the existing third harmonic injection method needs to be further improved

Method used

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  • Third harmonic injection method and device suitable for circulating current control of current converter
  • Third harmonic injection method and device suitable for circulating current control of current converter
  • Third harmonic injection method and device suitable for circulating current control of current converter

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Embodiment Construction

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0022] The inventor found that the technical problem existing in the existing third harmonic injection method is: the circulation control of the converter will make the AC modulation wave of the converter asymmetrical, and the corresponding positive and negative amplitudes will no longer be equal. The asymmetry of the positive and negative peaks of the AC modulation wave is not conducive to the full utilization of the modulation degree of the converter. At present, the existing technology has not considered the influence of the waveform coupling of the circulating curr...

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Abstract

The invention discloses a third harmonic injection method and device suitable for current converter circulation control. The method comprises the following steps: acquiring the amplitude and phase of a power frequency modulation wave of a current converter and the amplitude and phase angle of a second harmonic modulation voltage introduced by the current converter circulation control; and determining the amplitude and the phase of the third harmonic injection voltage when the maximum value of the positive peak value and the negative peak value of the alternating current modulation wave of the converter is minimum according to the relationship between the amplitude and the phase angle of the second harmonic modulation voltage introduced by the circulating current control of the converter and the amplitude and the phase of the power frequency modulation wave of the converter. According to the invention, the consistency of the positive and negative peak values of the modulation wave of the converter can be improved, so that the rated voltage of the transformer valve side of the converter can be further improved, the converter valve and related current are reduced, and the system loss is reduced.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a third harmonic injection method and device suitable for converter circulation control. Background technique [0002] This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] When the flexible HVDC system is in normal operation, its operating power range is limited by the modulation ratio of the converter. At present, relevant scholars at home and abroad have proposed an overmodulation operation method for modular multilevel converters. The third harmonic injection The method is a more general inverter over-modulation operation method, which injects the third harmonic modulation voltage with corresponding amplitude and phase angle into the modulation wave to reduce the peak value of the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02J3/36
CPCH02M7/483H02J3/36Y02E60/60
Inventor 宋志顺娄彦涛任军辉张树楠李喜喜
Owner XIDIAN POWER RECTIFIER XIAN
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