A Novel Design Method of Saturated Core Type HVDC System Fault Current Limiter Considering the Leakage Effect of Permanent Magnet
Zhou Hang1, Yuan Jiaxin1, Chen Fan1, Zhang Zhaoyang1, Hu Hongjiao2
1. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China; 2. Enshi Power Supply Company State Grid Hubei Electric Power Co. Ltd Enshi 445000 China
Abstract The extremely fast rising speed of the fault current in modern HVDC system has always been a big threat to both operating devices and system. Permanent magnet biased saturated core type fault current limiter is a promising way to limit the fault current of HVDC system by inserting an automatically changed inductor. However, the existing calculation and design process neglects the leakage effect caused by permanent magnet, resulting in a compromised accuracy. A precise design method, therefore, is necessary. In this study, a novel design and calculation method based on the high order Maclaurin approximation segment fitting strategy of the magnetic conductance was proposed, which considered the leakage effect of the permanent magnet. In this case, a more precise design method can be derived for this kind of electric facility. Firstly, different parts of magnetic conductance were calculated, then the magnetic conductance matrix was reconstructed. Finally, inductance value as well as relevant parameters can be obtained. Simulations based on finite element analysis and experiment results verified that compared with traditional method, proposed method can have about 20% increase in accuracy, while the calculation time can be greatly reduced. The proposed method is suitable in practical facility design procedure.
Zhou Hang,Yuan Jiaxin,Chen Fan等. A Novel Design Method of Saturated Core Type HVDC System Fault Current Limiter Considering the Leakage Effect of Permanent Magnet[J]. Transactions of China Electrotechnical Society, 2021, 36(9): 1956-1966.
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2021, Vol. 36 
