基于动态电感-励磁电流曲线的特高压变压器空载直流偏磁计算

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Abstract To improve the computational efficiency, a fast calculation method for DC bias of UHV transformer in no-load is proposed based on the dynamic inductance and exciting current curve (L-i curve). The efficiency and stability about the calculated current can be enhanced by increasing the series resistance. The error of the calculated current arising from the series resistance can be eliminated effectively by voltage compensation method. To discuss the differences between conventional field-circuit coupling algorithm and L-i curve method, magnetic field model is established according to the product level of UHV transformer parameters, and the L-i curve is drawn. Compared with the conventional field-circuit coupling algorithm, the proposed method can obtain the dynamic inductance value by cubic spline interpolation according to the calculated current, which do not need to return to the field model to get inductance. It can calculate the multiple cycles within a very short period of time. The method can improve the efficiency and accuracy of the DC bias calculation.

Key words： UHV transformer DC-bias L-i curve cubic spline interpolation voltage compensation

Received: 18 January 2016 Published: 26 May 2017

PACS:	TM74
	TM41

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	Wang Zezhong
	Tan Ruijuan
	Li Shulian
	Wang Huan
	Du Jianping

Cite this article:

Wang Zezhong,Tan Ruijuan,Li Shulian等. DC-Bias Calculation for UHV Transformer in No-Load Based on the Curve of the Relationship between Dynamic Inductance and Exciting Current[J]. Transactions of China Electrotechnical Society, 2017, 32(10): 154-161.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I10/154

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