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Recently, voltage-source converter (VSC)-based high-voltage dc (HVDC) transmission systems have gained more attention. In this paper, a control method for a modular VSC-based HVDC transmission system with high-frequency isolation referred to as high-frequency isolated modular converter is proposed. In the high-frequency isolated modular converter configuration, several floating dc capacitors in all...
Recently, multi-terminal DC (MTDC) system has received more attention in the power transmission areas. Development of modular structured power converter topologies has now enabled the power converter technology to attain high voltage high power ratings. Compared to current source converter technology, voltage source converters have several benefits including higher power quality, independent control...
The basic principles of UPFC operation are discussed and the series inverter dynamics are explained. Two control strategies — the Cross-Coupling method and the Advanced Control method are discussed in detail and their bode plots are analyzed. The two control methods are implemented in PSCAD for the NYPA UPFC at Marcy substation. The performance of the two methods is observed for step changes in active...
In this paper, the operation of Voltage Source Converter (VSC) based multi-terminal DC (MTDC) transmission system is evaluated under loss of converter station. From the control point of view, i) Master/Slave control method, and ii) droop control method are explored to control the multi-terminal DC grid. This paper compares different control methods for MTDC control under normal and loss of any terminal...
Solid State Transformer (SST) average models are needed to enable system and protection studies. This paper focuses on fine tuning existing average models to replicate their switching counterparts and also discusses and validates control modifications required for successful grid integration. A 3 phase test system comprised of Substation SSTs and load SSTs of different ratings has been developed in...
Electric Arc Furnaces (EAFs) are among the larger loads imposed upon the electrical grid. The size of these loads, when combined with the stochastic nature of the electric arc, and the poor reaction of the grid to such loads, makes the EAF worthy of study in general and modeling in particular. The present work develops a model of an EAF that is designed as a custom component for use with the PSCad...
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