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| Feeder Differential Protection Based on Dynamic Time Warping Distance in Active Distribution Network |
| Huang Chun1, Liu Penghui1, Jiang Yaqun1, Leng Hua2, Zhu Jiran2 |
1. College of Electrical and Information Engineering Hunan University Changsha 410082 China;
2. State Grid Hunan Electric Power Corporation Research Institute Changsha 410007 China |
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Abstract This paper proposes a novel feeder differential protection method for active distribution network. The protection is especially suitable for such feeders where voltage transformers are not equipped or both real-time communication and time synchronization ability of feeder terminal units (FTU) are weak. Firstly, the fault starting algorithm based on phase current fault component is used to trigger FTUs on the boundary of feeder section. And then these FTUs interchange fault current sampling data of a power frequency cycle. At last, dynamic time warping (DTW) distance of the sampling data is calculated to judge whether the section is faulty. With the cooperation of fault starting algorithm and DTW algorithm which has strong ability to resist synchronization error, neither voltage transformer nor precise synchronization among FTUs is necessary. This protection is easy to implement with low requirements of real time communication and computing capacity. It is also suitable for active distribution network with multi branch lines and high penetration of distributed generation. Simulation results verify the feasibility of the proposed scheme.
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Received: 25 July 2015
Published: 29 March 2017
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2017, Vol. 32 
