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This paper proposes a unified power flow algorithm based on the Newton–Raphson (NR) method to obtain a feasible solution for hybrid AC/DC grids incorporating voltage source converters (VSCs). The power flow model of hybrid AC/DC grids is composed of an AC grid model, a VSC station model, and a DC grid model. Detailed converter losses are involved in VSC station modeling. In the DC grid model, a unified...
Hybrid HVDC system combines the advantages of line commuted converter HVDC (LCC-HVDC) and voltage sourced converter HVDC (VSC-HVDC) and has become a popular trend for future grids. In this paper, the hybrid HVDC system, integrated in either a synchronous grid or connecting asynchronous grids, is introduced and studied. The LCC station model, VSC station model as well as the dc network model are established...
In this paper, the electromechanical model of VSC HVDC-integrated AC/DC hybrid system is established. The VSC station model is comprised of the physical model and the control model. In the mathematical control model, the inner current-loop regulator, the outer loop regulator, the modulation and the phase-lock loop are taken into consideration. The proposed model is validated through the simulation...
With the growing demands on the deployment of devices for power line communication (PLC), different issues have to be investigated. Due to the fact that zero crossing is of low noise power and can be applied for synchronization, zero crossing communication for power line system was carried out. However, its feasibility has not been analyzed thoroughly and the complicated simulation method also makes...
Hybrid HVDC is a novel topology which combines advantages of both line commuted converter (LCC) and the voltage source converter (VSC). In this paper, the power flow model of hybrid HVDC, which contains mathematical models of LCC and VSC stations, is built first, concerning the control modes of hybrid HVDC and converter transformers ratios. Based on that, the unified iterative power flow calculation...
This paper addresses the problem of controlling the DC voltage in multi-terminal DC grid based on voltage source converter. Based on the basic inner and outer controller of VSC station, three traditional DC voltage control methods: constant voltage control, voltage margin control and voltage droop control are analyzed and the corresponding drawbacks of these control methods are studied. In order to...
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