Research on Adaptive Grounding Distance Protection in Grid with Photovoltaic Power Plant

doi:10.11930/j.issn.1004-9649.2016.02.078.06

Abstract

Abstract: With the development of smart grid, photovoltaic power is gaining wide applications. Integration of a photovoltaic power plant (PV plant) into the distribution network will change the topological structure of the 110 kV system. Meanwhile, the equivalent impedance of PV plant varies with the changes of operation modes, which may affect the original distance protection scheme. The relationship between the measured impedance of distance protection and the equivalent impedance of PV plant is derived based on the operation characteristics of PV plant. The impact mechanism of PV plant on the measured impedance of distance protection is reviewed. A method of adaptive grounding distance protection based on the measured impedance correction is put forward according to the real-time equivalent impedances of PV plant which is calculated in different operation modes. As a result, the proposed protection is supposed to be suitable for changes of operation condition of PV plant. Furthermore, the protection setting values are universally suitable in different operation modes. A typical distribution network with PV plant was simulated and analyzed in PSCAD/EMTDC, and the results have demonstrated the effectiveness and superiority of the proposed protection method.

Key words: PV plant, equivalent impedance, adaptive grounding distance protection, measured impedance correction

CLC Number:

TM773

ZHAI Xue, , LIN Tao, , WU Junpeng, , GUO Ziyu, , XU Xialing. Research on Adaptive Grounding Distance Protection in Grid with Photovoltaic Power Plant[J]. Electric Power, 2016, 49(2): 78-83.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.02.078.06

https://www.electricpower.com.cn/EN/Y2016/V49/I2/78

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