Preprint Article Version 1 This version is not peer-reviewed

Improved Collecting Line Current Protection Scheme against Large-scale Wind Generators Tripping off

Version 1 : Received: 15 June 2018 / Approved: 18 June 2018 / Online: 18 June 2018 (13:48:38 CEST)

How to cite: Jin, W.; Lu, Y.; Huang, T. Improved Collecting Line Current Protection Scheme against Large-scale Wind Generators Tripping off. Preprints 2018, 2018060266 (doi: 10.20944/preprints201806.0266.v1). Jin, W.; Lu, Y.; Huang, T. Improved Collecting Line Current Protection Scheme against Large-scale Wind Generators Tripping off. Preprints 2018, 2018060266 (doi: 10.20944/preprints201806.0266.v1).

Abstract

There have been several cases of large-scale wind generators (WGs) tripping off caused by untimely fault removing in recent years. Currently, the discoordination between the box-type transformer fuse protection (BTFP) and two-section collecting line current protection (CLCP) brings a security risk to wind farm. In order to ensure the selectivity, the first section (Sec-I) CLCP should be set a enough interval that is longer than the fuse melting time, and another interval is set for the Sec-II CLCP, which weakens the speed of the CLCP. When a fault occurs on the collecting line, there is no doubt that WGs cannot work too long in abnormal operation, which may cause WGs to be placed off the grid. For a power system with high penetration of wind power, large-scale WGs tripping off will cause a great power shortage, and affect the stability of the power system. The selectivity and sensitivity of the CLCP is analyzed in detail to make the CLCP speed better. Considering the fault ride-through ability of WGs, the fault clear time is an important factor to lead to large-scale WGs tripping off. Two main works are done in this paper. The first is to accelerate the speed of the Sec-I CLCP though reducing the protection zone. Another one is introduce the risk assessment module into the CLCP, which not only improve the speed of the CLCP but also ensure the safety of the wind farm during faults. According to the deference in trip-off causes of WGs, the matching functions are created to assess the trip-off risk of WGs on the spot. In the case of fault, the trip-off risk indicators of WGs are timely updated to data sharing center and open to the CLCPs. The set of risk indicators is divided into several subsets according to the risk range. The dynamic changes of the subsets during fault help to improved CLCP scheme. This scheme can accelerate protection speed based on the increasing risk of large-scale WGs tripping off in wind farms. Compared with traditional CLCP, this approach can make the CLCP combines selectivity and speed better based on the analysis of the ride- through ability of WGs.

Subject Areas

Collecting line current protection (CLPC); coordination protection; large-scale WGs trip-off; risk indicator

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