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There are limited spaces for the fast increasing, highly concentrated loads in urban distribution networks. This paper proposes a medium voltage hybrid AC/DC distribution network, in which some AC lines are converted to DC ones, and interconnected with voltage source converter (VSC). A control strategy is also established to increase transfer capacity and DG accommodation. The economic evaluation...
In this paper, a real-time reactive power optimization method is proposed, which is proposed to solve the space-time coupling problem in the optimization of distribution network with distributed generation(DG). Firstly, a reactive power optimization model of distribution network considering the unified power flow controller(UPFC) is established. We find out the voltage weak node as the installation...
In radial distribution systems, three step current protection, also called overcurrent protection, has been widely used for many years. When distributed generators (DGs) are connected to a radial distribution system, they will have some effects on the traditional overcurrent protection scheme and may lead to false tripping. This paper proposed a new communication supported fast current protection...
Three-phase four-wire inverters, with either three-leg or four-leg topology, are useful for interfacing distributed generation to networks of unbalanced loads, but neither of the available circuit topologies is ideal. The split-link three-leg topology (with six switches) suffers from poor DC voltage utilization compared with the four-leg topology (with eight switches). The four-leg topology has an...
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