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This paper proposes a method of fault line selection for a DC distribution network. Firstly, the 1-mode current is calculated using the measured currents of the positive and the negative line. Then, it is time reversed and further decomposed by wavelet technology. Secondly, the lossless mirror line network is established according to the parameters and the topology of the DC distribution network. Thirdly, it is presumed that several virtual current sources are employed at the locations where the corresponding observers are, and the values of these current sources are equal to the processed 1-mode currents. Fourthly, a fault is placed at every point of the lossless mirror line network the RMS value of every assumed fault current is calculated. During this process, the phase coefficient of every lossless mirror line is set to vary along with the length of the line obeying Gaussian distribution. Finally, the line with the peak value of the RMS values of the currents is selected as the fault line. The result of fault line selection is updated using the fewest observers that are set in advance according to the initial result. A DC distribution network is simulated in PSCAD/EMDTC to verify the correctness of the proposed method.
Xipeng Zhang; Nengling Tai; Pan Wu; Xiaodong Zheng; Wentao Huang. A Fault Line Selection Method for DC Distribution Network Using Multiple Observers. Energies 2019, 12, 1245 .
AMA StyleXipeng Zhang, Nengling Tai, Pan Wu, Xiaodong Zheng, Wentao Huang. A Fault Line Selection Method for DC Distribution Network Using Multiple Observers. Energies. 2019; 12 (7):1245.
Chicago/Turabian StyleXipeng Zhang; Nengling Tai; Pan Wu; Xiaodong Zheng; Wentao Huang. 2019. "A Fault Line Selection Method for DC Distribution Network Using Multiple Observers." Energies 12, no. 7: 1245.
Multiple microgrids (MMGs) are clusters of interconnected microgrids that have great potential for integrating a large number of distributed renewable energies (DREs). The grid-connected control scheme is important for the exploration of the MMGs’ operation potential. In this paper, a multi-layer coordinated control scheme for DC interconnected MMGs is proposed to optimize their operation and improve their operation friendliness. An adaptive droop control method is designed for the DC connection interfaces of the MMGs to adaptively manage the power exchange among the sub-microgrids. Meanwhile, the strategy of power fluctuation suppression is developed for the hybrid energy storage system (HESS) in the MMGs. The coordination among the sub-microgrids and the HESS is then clarified by the proposed control scheme to optimize the AC tie-line power and make the MMGs a highly coordinated collective. A case study is performed in PSCAD/EMTDC based on the demonstration project in Guangxi, China. The results show that the proposed multi-layer coordinated control scheme realizes the coordinated operation of the MMGs, fully exploits the complementarity of the MMGs, and improves the operation friendliness among the sub-microgrids and the utility grid. Thus the integration and utilization of a large number of DREs is enhanced.
Pan Wu; Wentao Huang; Nengling Tai; Zhoujun Ma; Xiaodong Zheng; Yong Zhang. A Multi-layer Coordinated Control Scheme to Improve the Operation Friendliness of Grid-Connected Multiple Microgrids. Energies 2019, 12, 255 .
AMA StylePan Wu, Wentao Huang, Nengling Tai, Zhoujun Ma, Xiaodong Zheng, Yong Zhang. A Multi-layer Coordinated Control Scheme to Improve the Operation Friendliness of Grid-Connected Multiple Microgrids. Energies. 2019; 12 (2):255.
Chicago/Turabian StylePan Wu; Wentao Huang; Nengling Tai; Zhoujun Ma; Xiaodong Zheng; Yong Zhang. 2019. "A Multi-layer Coordinated Control Scheme to Improve the Operation Friendliness of Grid-Connected Multiple Microgrids." Energies 12, no. 2: 255.