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5 results on '"CheshmehBeigi, Hassan Moradi"'

2. Impact of controllable superconducting series reactor in transient recovery voltage of circuit breaker

Author

Heidary, Amir, CheshmehBeigi, Hassan Moradi, and Mehrizi-Sani, Ali

Subjects
circuit breaker, fault current limiter, superconducting series reactor, transient recovery voltage
Abstract

Series reactors as fault current limiters (FCLs) are extensively employed to enhance power grid protection issues. Utilizing superconducting technology is a viable solution to approach FCLs toward commercializing. The concern of transient recovery voltage (TRV) of the circuit breaker becomes more considerable due to FCL’s high stored energy in the case of fault current limiting mode. This paper firstly focuses on the analysis of TRV under the presence of an inductive-based superconducting fault current limiter (SFCL) installed in a power grid, and then it investigates the impact of a controllable superconducting series reactor (CSSR) in TRV of the circuit breaker. The obtained results show that the synchronous operation of a CSSR with a circuit breaker substantially declines TRV.

Published
2021

4. Optimal placement of direct current power system stabiliser (DC-PSS) in multi-terminal HVDC grids.

Author

Azizi, Neda, CheshmehBeigi, Hassan Moradi, and Rouzbehi, Kumars

Subjects
*VOLTAGE-frequency converters, *IDEAL sources (Electric circuits), *MIMO systems, *DYNAMICAL systems, *SENSITIVITY analysis
Abstract

This study focuses on the selection of the most effective location of direct current power system stabiliser (DC-PSS) in multi-terminal high-voltage direct current (MT-HVDC) grids that is applied to voltage source converter (VSC) to voltage stability enhancement and oscillation damping. Due to the adverse interaction between having multiple number of DC-PSS, it is necessary to select the best location for installing DC-PSS in MT-HVDC grid. In this study, the participation factor (PF) method is used. This method assists to find which power converters are more sensitive and have a major impact on the instability of the entire system. In this approach, the whole of the system is modelled as a multi-input multi-output (MIMO) dynamic system. PFs related to each power converter are intended by the oscillatory mode sensitivity analysis against the components of the MIMO matrix of the system. The PF analysis determines which VSC station is more participating in the small-signal instability of the system. In order to endorse the efficiency of the proposed method, time-domain MATLAB simulations are conducted in Cigré MT- HVDC grid benchmark. [ABSTRACT FROM AUTHOR]

Published
2020
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