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This paper presents an improved two-level voltage source converter for dc transmission systems with relatively low rated power and dc operating voltage. Unlike conventional two-level converter, the presented converter employs two distributed cell capacitors per three phase; thus, do not contribute any current when converter is blocked during dc short-circuit fault as in modular multilevel converter...
Conventional fault analysis algorithms may not be suitable for the AC/DC hybrid systems. To solve this problem, a mathematical model for HVDC (High Voltage Direct Current) system, which is suitable for analyzing faults in AC system, is presented in this paper. Firstly, based on the switching functions method and sequence components method, an equivalent model of HVDC converter under the asymmetric...
The conventional fault analysis methods and fault analytical models may not be feasible for the AC-DC hybrid systems because of the highly nonlinear time-varying converters. To solve the problem, the paper presents a mathematical model for the analysis of the performance of HVDC converter during the AC faults, especially asymmetric faults. The model is developed using the improved switching functions...
The conventional fault analysis algorithms and fault analytical models may not be suitable for the ac/dc hybrid systems because of the highly nonlinear converters. To alleviate the problem, the paper presents a steady state short-circuit converter model based on the switching function theory for analyzing faults in the ac system, including asymmetric faults. In order to regard the effect of the short-circuit...
The 100 Hz protection function in an HVDC system is a backup protection for the ac system. The misoperation of the 100 Hz protection has severe effect on the safe and stable operation of the power system. Based on the proposed sequence switching-function model of the HVDC converter, and combined with the short circuit calculation program for the ac system, a practical method of calculation and Identification...
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