scholarly journals Design Requirement and DC Bias Analysis on HVDC Converter Transformer

2021 ◽  
Vol 257 ◽  
pp. 01038
Author(s):  
Weijian Peng ◽  
Qi Liu ◽  
Li Liang ◽  
Wenqi Jiang ◽  
Zhuoyuan Zhang
Keyword(s):  
Direct Current ◽  
Critical Role ◽  
Bias Current ◽  
Design Requirement ◽  
Current Effect ◽  
Paper Briefly ◽  
Bias Analysis ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Dc Bias

The converter transformer plays a critical role in the high-voltage direct current (HVDC) transmission system, which connects but separates the AC grids and the converter. This paper briefly introduced the essential design requirement of the HVDC converter transformer in a system at ±800kV level and analyzed the DC bias influence on the transformer. The DC bias current effect simulations are analyzed in MATLAB and ANSYS Maxwell in this paper, respectively.

scholarly journals Influence of HVDC Transmission on DC Bias of AC Grid and Its Treatment

2021 ◽  
Author(s):  
Ruifeng Zhan ◽  
Yuying Hu ◽  
Fan Li ◽  
Zhou Mi ◽  
Lingpeng Dong
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Power Grid ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Grid Topology ◽  
Treatment Measures ◽  
Calculation Results ◽  
Transformer Winding ◽  
Dc Bias

With the rapid development of China’s electric power industry, the high-voltage and long-distance direct current (DC) transmission effectively solved the problem of uneven power distribution. When the high voltage direct current transmission is in unipolar operation or bipolar asymmetric operation, part of the DC current will flow into the transformer winding through the grounded neutral point, which will cause the DC bias problem. This article used CDEGS software for modeling, and introduced the process of CDEGS software for DC bias simulation modeling. In this paper, the DC bias model of regional power grid is first established, based on the Zhejiang power grid topology and the test soil resistivity date. Then the DC bias currents of the transformers are calculated, and finally the corresponding treatment measures are proposed. According to the governance measures, this article adjusted the simulation model. The calculation results show that the treatment measures have good effects, which can provide an important reference for the future treatment of transformer DC bias.

Realization of Automatic Power Control in HVDC Control and Protection System

2014 ◽  
Vol 716-717 ◽  
pp. 1226-1229
Author(s):  
Rui Zhang ◽  
Yan Hong Shen ◽  
Cun Yu ◽  
Feng Long Li ◽  
Ke Wei Pang ◽  
...  
Keyword(s):  
Control System ◽  
Power Control ◽  
High Voltage ◽  
Direct Current ◽  
Current Control ◽  
Paper Briefly ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Direct Current Control ◽  
Automatic Power Control

The paper briefly investigates the importance of power control of HVDC (high voltage direct current) control system in the HVDC projects and focus on the actual analysis and research on the realization of automatic power control in HVDC transmission. It has the important guiding significance for the implementation of automatic power control in HVDC transmission.

scholarly journals Traveling Wave Based Security Plan for Bipolar Transmission Boundary

2019 ◽  
Vol 8 (3S2) ◽  
pp. 416-421
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Traveling Wave ◽  
Hvdc Transmission ◽  
High Voltage Direct Current

The High Voltage Direct Current (HVDC) transmission framework is progressively utilized and quickly creating in the parts of long separation and huge limit control transmission. An epic voyaging wave-based security plot for bipolar HVDC boundary is furnished in this paper. The insurance dependent on voyaging wave utilized as the primary assurance for HVDC transmission boundary. MATLAB model is used to extract the results from various conditions.

scholarly journals Wavelet transform as a postprocessing diagnostic tool for fault identifications of high-voltage direct current transmission system

FACETS ◽  
2017 ◽  
Vol 1 (1) ◽  
pp. 17-26 ◽  
Author(s):  
P. Sanjeevikumar ◽  
Frede Blaabjerg
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Diagnostic Tool ◽  
Simulation Software ◽  
Discrete Wavelet ◽  
Transmission Network ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Ground Fault ◽  
Current Transmission

This short communication focuses on exploiting the inherent advantages of discrete wavelet transformation (DWT) as a diagnostic tool for post-processing and for identifying the faults that occur in the standard high-voltage direct-current (HVDC) transmission network. In particular, a set of investigations are developed and examined for single-line-to-ground fault on the generation and on the load side converter, and DC-link fault. For this purpose, a standard 12-pulse line-commutated converter (LCC)-HVDC transmission network along with the DWT algorithm is numerically modeled in the MATLAB/PLECS simulation software. Furthermore, in this paper, a set of designed faulty conditions are predicted using the output of DWT and the results of numerical simulation are presented. Results are in good agreement with expectations to prove that DWT is an effective tool for fault diagnostics.

Research on power transformer vibration and noise under DC bias condition

2022 ◽  
pp. 1-15
Author(s):  
Mengmeng Ai ◽  
Wenhui Liu ◽  
Yi Shan
Keyword(s):  
Force Field ◽  
Direct Current ◽  
Natural Frequencies ◽  
Power Transformer ◽  
Sound Field ◽  
Ferromagnetic Material ◽  
High Voltage Direct Current ◽  
Structural Force ◽  
Dc Bias ◽  
Transformer Core

In the process of Ultra high voltage direct current (UHVDC) transmission, the direct current (DC) bias of power transformer is easily induced, which makes the transformer exciting current distorted, the ferromagnetic material saturated and the magnetic leakage increased, and then leads to the increase of core vibration and noise. Aiming at this problem, taking a 240 MVA, 330 kV three-phase five-column power transformer as an example, the coupling of the electromagnetic field, structural force field and acoustic field is studied, and the influence of DC bias on vibration and noise of power transformer core is analyzed in this paper. According to the magnetic density and electric density of transformer core under different magnetic bias degree, the structural force field is solved, and the displacement and surface acceleration of core are obtained, which can be as the excitation of sound field to determine the noise distribution of transformer. In order to avoid the natural frequencies which easily cause resonance, the modal analysis is needed to obtain the natural frequencies and modal modes of the core. The transformer noise under no-load and DC bias conditions of the prototype is tested experimentally and compared with the theoretical calculation, the results prove the accuracy of the simulation calculation method in this paper.

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