Optimized configuration of DC bias current suppression resistors in HVDC based on MOFPSO

Zhong, Zhouyu; Zhang, Shengqi; Zhao, Jianfeng

doi:10.1109/apec.2017.7930822

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…A method for optimizing CBD installation to control the DC bias of a transformer was analysed in the literature [13,14]. The influence of adding a resistance below 10 Ω to the neutral point of the main transformer in stations was discussed by the authors of [15,16], and Dutta and Bhattacharya researched a current injection method through simulation calculations and online monitoring [17]. A potential compensation method for restraining the DC bias of autotransformers is discussed in the literature [18,19].…”

Section: Introductionmentioning

confidence: 99%

Combination Optimization Configuration Method of Capacitance and Resistance Devices for Suppressing DC Bias in Transformers

Wang

Liu

2019

Energies

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The ground current of a high-voltage direct current (HVDC) transmission system can cause DC bias in transformers near the grounding electrode during monopole operations, which affects the alternating current (AC) power system operation. Owing to multiple bias current flow paths, a capacitance blocking device installed at the neutral point of a transformer may increase the DC bias in adjacent transformers, while suppressing the DC current in that transformer. This paper introduces the use of an effective bias current indicator to describe the effect of the grounding current on transformers in a network, considering the wiring characteristics of the autotransformers and the power system topology. Additionally, a combination optimization method for the capacitance and resistance is applied in order to determine the minimum number of installed devices that restrict the maximum effective bias current throughout the network to a permissible range. A genetic algorithm based on an improved roulette selection method is adopted to solve the optimal configuration problem. The method is validated by using a test case based on the Xizhe HVDC transmission receiving-end grid near the Jinsi grounding electrode. The configuration of the capacitance and resistance was optimized by the improved genetic algorithm. This method can achieve the desired level of DC bias management with fewer devices than the conventional method, which verifies the feasibility and superiority of the proposed optimization method.

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Section: Introductionmentioning

confidence: 99%

Combination Optimization Configuration Method of Capacitance and Resistance Devices for Suppressing DC Bias in Transformers

Wang

Liu

2019

Energies

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“…The existing DC bias restraint measures mainly include method of adding a DC‐blocking capacitor and a current‐limiting resistor to the transformer neutral point, the reverse DC voltage injection method and the method of changing the neutral point‐grounding mode . However, for all the above methods, it is necessary to obtain the distribution of DC current in an alternating current (AC) power grid in advance for reasonable arrangement of restraint measures.…”

Section: Introductionmentioning

confidence: 99%

“…The existing DC bias restraint measures mainly include method of adding a DC-blocking capacitor and a current-limiting resistor a Correspondence to: Weng Hanli. E-mail: honey_weng@163.com *Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station, China Three Gorges University, Yichang 443002, China **State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China to the transformer neutral point, the reverse DC voltage injection method and the method of changing the neutral point-grounding mode [8][9][10][11][12]. However, for all the above methods, it is necessary to obtain the distribution of DC current in an alternating current (AC) power grid in advance for reasonable arrangement of restraint measures.…”

Section: Introductionmentioning

confidence: 99%

Saturation characteristics of a transformer under DC bias and their influence on the distribution of DC current in an AC power grid

Weng

et al. 2018

IEEJ Transactions Elec Engng

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Based on the phenomenon of direct current (DC) component occurring in transformer magnetizing current in the case of transformer saturation resulting from DC bias, the influence of such a DC component on the distribution of DC current in the transformer neutral point is analyzed. By virtue of PSCAD/EMTDC software, the simulation model of a transformer suffering due to DC bias is built up to analyze the DC current characteristics in the transformer neutral point in the cases of taking into account and taking not into account of the transformer saturation caused by DC bias, respectively. According to the results obtained, the simulation value of DC current in the Yichang‐region power grid taking no account of transformer saturation is corrected. It is verified that the saturation of transformer magnetizing branch contributes to increase the DC current in the transformer neutral point. Taking into account the transformer saturation influence, the prediction accuracy of the DC current distribution in the AC power grid can be improved. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Optimized configuration of DC bias current suppression resistors in HVDC based on MOFPSO

Cited by 2 publications

References 15 publications

Combination Optimization Configuration Method of Capacitance and Resistance Devices for Suppressing DC Bias in Transformers

Combination Optimization Configuration Method of Capacitance and Resistance Devices for Suppressing DC Bias in Transformers

Saturation characteristics of a transformer under DC bias and their influence on the distribution of DC current in an AC power grid

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