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Smart Grid Publications
A PLC frequency model of 3 phase power distribution transformers
A model of a 200 kVA, 240 V to 11 kV, 3 phase power distribution transformer is presented. 1000 impedance measurements, covering a frequency range of 50Hz to 5 MHz were made on each of 23 terminal combinations for this unenergized transformer. The model consists of 21 circuit elements per phase plus 2 circuit elements for neutral to transformer case coupling. That model is then optimized to minimize the differences between the model and the measurements, resulting in an accurate wide frequency range model. This model can then be used for SmartGrid PLC system design, to ensure that PLC coupling networks work well with the transformers and that all PLC modems on the network can effectively communicate to the control system.
Model of a real medium voltage distribution network for analysis of distributed generation penetration in a SmartGrid scenario
The paper aims at simulating the behaviour of a real medium voltage electric network in order to analyse the effects of distributed generation penetration, in particular from solar source. Firstly the network model has been designed by the simulation tool DIgSILENT, using data obtained from the Distribution System Operator (DSO) to highlight, through subsequent checks, the likeliness between results from simulated scenarios and available measurements. Then static simulations were performed, with different scenarios of PV generation, in order to check the possibility to manage this generation. The behaviour of the network in compliance with the current national standards has been verified. Finally some dynamic simulations were performed in order to analyse transients due to typical operations of distribution systems.
Feeder routing in DG interfaced power distribution networks using MSTB-GT approach
This paper presents a minimum spanning tree based graph theoretic approach (MSTB-GT), feeder routing in power distribution network including DGs. Graph theoretic is found to be much simpler and effective solution that significantly reduces the complexities of existing search algorithms and provides the optimal radial path while minimizing the cost. The proposed technique is tested for different topologies of power distribution network with DGs and the results obtained for feeder routing is highly encouraging compared to earlier existing techniques. As Graph theoretic approach is based on structural analysis, thus can be used for online planning leading to microgrid planning for smartgrid infrastructure.
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