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... SOP can also control the active power flow among the feeders and compensate for reactive power. A detailed control algorithm for power flow control, fault isolation, and supply restoration has been proposed in [3]. The system configuration with an SOP is shown in Fig. 1, and the basic configuration of the backto-back based SOP is shown in Fig. 2, where V V V 1 , V V V 2 , · · · , V V V n represent the ac voltage sources ports from same or different grids, and the SOP connect them together to the same dc link capacitor C dc whose voltage amplitude is V dc ...
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Citations
... In conventional power systems, stability is guaranteed through the voltage/frequency support and rotational masses of synchronous generators, and grid-tied converters simply follow the established grid. However, the growing penetration of grid-tied power converters will necessitate grid-forming capabilities (Han et al., 2019;Deng et al., 2021;Lin, 2020;Fang, 2021a). As for current grid architectures, existing grid-forming converters can only be connected in parallel for current sharing, but they cannot withstand high voltages (Lin, 2020). ...
The growth of renewable energies, together with their power converter interfaces, reshapes power systems into more-electronics power systems. Along with this paradigm shift is the requirement of grid formation by grid-tied power converters. However, existing grid architectures only allow parallel operation of grid-forming converters, which excludes high-voltage applications. This article proposes novel lattice power grids that combine the advantages of multilevel converters and power grids, thereby allowing both serial and parallel connectivity with modularity and scalability. Further, we propose control and optimization algorithms for lattice power grids by use of graph theory. In particular, we investigate H-bridge-based lattice power grids and achieve several objectives, including desired voltages and currents between any two selective nodes in lattice power grids as well as efficiency optimization by minimizing switching actions. To achieve these objectives, this article details control and optimization methodology for square lattice power grids. Finally, the proposed algorithms and lattice power grids are validated via simulation results.
