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LCC converter station direct-current voltage harmonic calculation method considering trigger angle fluctuation

A DC voltage and calculation method technology, applied in the field of harmonic transmission, can solve the problems of not considering the dynamic changes of the commutation process, and the inability to accurately and comprehensively analyze the DC voltage harmonics, so as to achieve the effect of reducing the occurrence of power failures

Active Publication Date: 2020-11-27
SICHUAN UNIV
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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the method for calculating the harmonics of the DC voltage of the LCC converter station in consideration of the fluctuation of the firing angle provided by the present invention solves the problem that the harmonic analysis of the DC voltage of the existing LCC converter station does not consider the fluctuation of the firing angle. Due to the dynamic changes in the commutation process, it is impossible to accurately and comprehensively analyze the problems of various harmonics in the DC voltage

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  • LCC converter station direct-current voltage harmonic calculation method considering trigger angle fluctuation
  • LCC converter station direct-current voltage harmonic calculation method considering trigger angle fluctuation
  • LCC converter station direct-current voltage harmonic calculation method considering trigger angle fluctuation

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Embodiment 1

[0061] Such as figure 1 As shown, the calculation method of the DC voltage harmonics of the LCC converter station considering the firing angle fluctuation includes the following steps:

[0062] S1. Based on the phase separation control method of the LCC converter station and the principle of trigger pulse generation, the conduction state of a single thyristor in the LCC converter station is analyzed by using the double Fourier analysis method, and the harmonic analysis result of a single thyristor is obtained ignoring the commutation process;

[0063] S2. Based on the Fourier series fitting method, fitting the thyristor commutation process in which the thyristor dynamically changes with the fluctuation of the firing angle, and obtaining the corresponding commutation end time;

[0064] S3. Based on the harmonic analysis results of a single thyristor ignoring the commutation process and the commutation end time, the conduction state of a single thyristor is analyzed by the doubl...

Embodiment 2

[0129] In this embodiment, the harmonic analysis of the DC voltage characteristics is performed on the above-mentioned calculation method of the DC voltage harmonics of the LCC converter station considering the fluctuation of the firing angle to verify the correctness of the method of the present invention:

[0130] Build such as in the PSCAD / EMTDC simulation platform Figure 5 The shown three-phase rectifier bridge and its trigger signal generation module, the detailed parameters of the rectifier bridge are shown in Table 1

[0131] Table 1 Detailed parameters of rectifier bridge

[0132]

[0133] A low-frequency fluctuation with an amplitude of 9° and a frequency of 10 Hz is superimposed on the trigger angle of the simulation model, and then the DC voltage spectrum analysis results of the electromagnetic simulation are compared with the calculation results of the mathematical model.

[0134] Such as Figure 6 As shown in (a), the phase angle of the AC system output by t...

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Abstract

The invention discloses an LCC converter station direct-current voltage harmonic calculation method considering trigger angle fluctuation. Based on an LCC converter station split-phase control methodand a trigger pulse generation principle, trigger angle fluctuation and dynamic characteristics of a commutation process can be reflected more clearly and visually, and a harmonic generation principleand a transmission mechanism can be explained clearly; a double Fourier method and a Fourier series fitting method are adopted; harmonic analysis is carried out on the conduction state of each thyristor; a three-phase voltage switching function is deduced and constructed, a mathematical model for direct-current harmonic analysis is obtained, the mathematical model can meet the calculation requirements of characteristic harmonics and can also accurately analyze inter-harmonics introduced by fluctuation of a trigger angle, a guiding effect is achieved on design optimization of a direct-currentfilter, and electric power faults of a direct-current power transmission network are reduced.

Description

technical field [0001] The invention relates to the technical field of harmonic transmission, in particular to a method for calculating harmonics of a DC voltage of an LCC circulation station in consideration of trigger angle fluctuations. Background technique [0002] The line commutated converter based high voltage direct current (LCC-HVDC) system is widely used in scenarios such as grid interconnection and long-distance large-capacity transmission. However, due to the inherent nonlinear characteristics of the converter and the asymmetrical factors of the AC system, harmonic voltages and currents will appear in the system, which will cause non-negligible impact and harm to the system itself and users. In order to ensure the stability of the power system To prevent damage to electrical equipment and ensure stable operation of the power grid, it is necessary to accurately analyze various harmonics in the system to provide a data basis for the optimal design of the LCC-HVDC s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R23/16G06F17/15
CPCG01R19/0053G01R23/16G06F17/15
Inventor 马俊鹏黄河王顺亮刘天琪
Owner SICHUAN UNIV
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