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Calculation Method of DC Voltage Harmonic in LCC Converter Station Considering Firing 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: 2021-09-21
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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  • Calculation Method of DC Voltage Harmonic in LCC Converter Station Considering Firing Angle Fluctuation
  • Calculation Method of DC Voltage Harmonic in LCC Converter Station Considering Firing Angle Fluctuation
  • Calculation Method of DC Voltage Harmonic in LCC Converter Station Considering Firing 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 which ignores the commutation process is obtained;

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

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

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 a method for calculating the DC voltage harmonics of an LCC converter station considering the fluctuation of the firing angle. Based on the phase separation control method of the LCC converter station and the principle of generating the firing pulse, it can reflect the fluctuation of the firing angle more clearly and intuitively. The dynamic characteristics of the commutation process can clearly explain the principle of harmonic generation and transmission mechanism; through the double Fourier method and Fourier series fitting method, conduct harmonic analysis on the conduction state of each thyristor, deduce and construct a three-phase The mathematical model of DC harmonic analysis is obtained from the voltage switching function. This mathematical model can not only meet the calculation requirements of characteristic harmonics, but also accurately analyze the inter-harmonics introduced by firing angle fluctuations, which has a guiding role in the design and optimization of DC filters. , reducing the occurrence of power failures in the DC transmission network.

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 Patents(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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