Abstract
Modelling and estimating power-line communication (PLC) channels are complicated issues due to the complex network topologies, various junctions, and changeable loads. This paper focuses on the frequency response characteristics (FRCs) of medium-voltage (MV) PLC networks with special consideration of two scenarios that are often neglected but generally exist. In the first scenario, the MV distribution network is of the ring topology. In the second scenario, the MV overhead lines and underground cables join at junctions, and the shields of underground cables are grounded with nonzero grounding impedances at the junctions. These conditions lead to the failure of currently popular methods to different degrees. For this reason, we developed an effective method to calculate the FRCs of distribution networks for PLC applications. With this method, the frequency responses of nodes are simply expressed as the binary function of the overall tube propagation matrix and overall node scattering matrix, which is convenient for calculations and analyses. The proposed method was validated by the agreement between the calculated and measured FRCs. The results of two test examples showed that the proposed method performed better in comparison with the traditional approximate method when nonideal grounding conditions were taken into account. The proposed method is also independent of the network topology, so it can adapt to the dynamic changes of the network structure.
Highlights
Existing distribution systems are evolving towards smart distribution grids due to the emergence of distributed generation and the need for environmentally friendly, flexible, and reliable electric power
We devised a new method to calculate the frequency response characteristics (FRCs) of MV distribution networks based on the Baum-Liu-Tesche (BLT) equation originating in the electromagnetic compatibility (EMC) field
There have been several popular methods to model the FRCs of power-line networks, but they may be inapplicable in some MV distribution networks
Summary
Existing distribution systems are evolving towards smart distribution grids due to the emergence of distributed generation and the need for environmentally friendly, flexible, and reliable electric power. Another popular alternative is using nodal analysis [14,15], in which the power-lines, loads, and junctions are all represented by the admittance matrices This method can be applied to distribution networks of arbitrary topologies and is appropriate to address the FRCs of large-scale distribution networks. An effective method to calculate the FRCs of various hybrid distribution networks should be developed considering imperfect grounding conditions and the interconnection of power-line channels with different total conductor numbers. To this end, we devised a new method to calculate the FRCs of MV distribution networks based on the Baum-Liu-Tesche (BLT) equation originating in the electromagnetic compatibility (EMC) field.
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