Method for assessing occurrence of commutation failure based on harmonic comprehensive commutation coefficient

A technology for commutation failure and harmonics, which is applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, power transmission AC networks, etc., to achieve a small calculation dimension, accurate calculation results, and comprehensive commutation failure indicators. Effect

Active Publication Date: 2018-08-17
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

[0004] The present invention aims at the problem of ignoring the influence of fundamental wave voltage zero-crossing point offset on commutation failure in the prior art, and proposes a method for evaluating commutation failure based o

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  • Method for assessing occurrence of commutation failure based on harmonic comprehensive commutation coefficient
  • Method for assessing occurrence of commutation failure based on harmonic comprehensive commutation coefficient
  • Method for assessing occurrence of commutation failure based on harmonic comprehensive commutation coefficient

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Embodiment Construction

[0022] The present invention is based on the method of commutation failure evaluation based on harmonic comprehensive commutation coefficient, see figure 1 The flow chart shown:

[0023] The DC transmission system is mainly composed of three-phase power supply (mainly referring to power plants), converter stations (including rectifier stations and inverter stations), transmission cables or overhead lines, and AC power grids. After the AC power is generated by the power plant and boosted by the transformer, the AC power is converted into DC power by the rectification converter station, and then transmitted to the DC terminal through the transmission line. AC bus side.

[0024] 1) Obtain the data of the arc extinguishing angle output by the converter valve of the inverter station, and select the data of a certain arc extinguishing angle drop time: when the acquisition system runs to a certain arc extinguishing angle drop time of the converter valve of the inverter station, the ...

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Abstract

The invention relates to a method for assessing occurrence of commutation failure based on the harmonic comprehensive commutation coefficient. The corresponding AC bus voltage of a certain extinctionangle drop moment of operation to the inverter station converter valve is acquired, and the phase offset of the voltage amplitude of each harmonic and the fundamental phase relative to the normal commutation situation and the corresponding leading trigger angle and the extinction angle of the moment under normal operation of the system are obtained after Fourier transform of the AC bus voltage ofthe moment; the harmonic voltage comprehensive influence factor and the harmonic phase comprehensive influence factor are calculated, the two factors are added to obtain the harmonic comprehensive commutation coefficient, and the DC system commutation failure is judged according to the situation of whether the harmonic comprehensive commutation coefficient is greater than the maximum commutation area margin. The calculation method is low in calculation dimension and fast in speed; the method comprehensively considers the harmonic order, the harmonic voltage amplitude and the fundamental offsetcaused by the harmonic waves so that the calculation and judgment result is enabled to be more accurate; and the method is suitable for evaluation of continuous commutation failure.

Description

technical field [0001] The invention relates to a high-voltage direct current transmission technology, in particular to a method for evaluating commutation failure occurrence based on harmonic comprehensive commutation coefficients. Background technique [0002] With the construction and operation of the large-scale direct current transmission project of the State Grid Corporation of China "nine ACs and thirteen direct currents", my country has gradually formed a UHV, multi-point AC-DC hybrid system. High voltage direct current (HVDC) has the characteristics of large capacity, long distance, and asynchronous grid interconnection, and has gradually been widely used. At the same time, the close connection of AC and DC systems brings unique electrical characteristics to the power grid, that is, disturbances in the AC system often affect the normal operation of the DC system. [0003] Commutation failure, the most common fault in DC systems, has been widely concerned. A series ...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/01
CPCH02J3/01H02J3/36Y02E40/40Y02E60/60
Inventor 黄华赵丹丹崔勇周行星于姜赟张美霞杨秀
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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