Comprehensive Protection Method for Low-Voltage Cable of PV Plant DC Collection System Based on Series Reactance
Xi Xinze1,2, Huang Wentao3, Zhang Lin3, Sun Lei3, Tai Nengling3
1. School of Electrical Engineering Chongqing University Chongqing 400044 China; 2. Electric Power Research Institute Yunnan Power Grid Co. Ltd Kunming 650217 China; 3. School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China
Abstract A comprehensive protection method of low-voltage DC cable based on series reactance is proposed for the DC collection system of photovoltaic power plants. In order to prolong the protection clearing time, the fault current is suppressed by stringing the current-limiting reactance between the low-voltage DC cable and the power electronic devices. In this paper, the method of obtaining the current fraction is improved, and the cable fault location is calculated by using the voltage and current on both ends of the DC cable to protect the low-voltage DC cable. The protection will not be affected by fault types, fault locations and fault impedance. The protection criterion is simple and reliable to clear faults, and the fault location can be obtained in the process of protection calculation. The action of the proposed protection will still be correct when the data of the different ends is not synchronized. The effectiveness of the protection method is verified by PSCAD/EMTDC simulation. The simulation results show that this method can realize DC cable protection and fault location, and this method is suitable for DC transmission and distribution network.
Xi Xinze,Huang Wentao,Zhang Lin等. Comprehensive Protection Method for Low-Voltage Cable of PV Plant DC Collection System Based on Series Reactance[J]. Transactions of China Electrotechnical Society, 2018, 33(zk2): 608-615.
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