Search

Your search keyword '"Jalilian, Alireza"' showing total 182 results
Start Over Author "Jalilian, Alireza"
182 results on '"Jalilian, Alireza"'

39. Updated Harmonic and Interharmonic Current Summation Rule in Wind Power Plants with Type III Wind Turbines.

Author

Ghanavati, Hamed, Kocewiak, Łukasz H., and Jalilian, Alireza

Subjects
WIND power plants, WIND turbines, RESONANCE, TRANSFER functions, VOLTAGE
Abstract

An assessment of Wind Turbine (WT) harmonic current contribution to the grid (Primary Emission, PE) at the Wind Power Plant (WPP) Point of Connection (PoC) is presented in this paper. Also, the contribution of the grid background harmonic voltage distortion to the harmonic current distortion at the WT terminals (Secondary Emission, SE) is evaluated. The procedure is carried out based on PE Transfer Function (TF) and SE Transfer Admittance (TA). To increase the accuracy of these TFs in studying harmonic current summation in WPP harmonic assessment procedure, the TFs must also include the Doubly-Fed Asynchronous Generator (DFAG)-based WT impedance. Hence, this article proposes a new model of PE TFs and SE TAs including the type III WT impedance. The proposed approach includes average modelling of DFAG back-to-back converters to extract the total impedance of the WT (including passive components and converter equivalent impedance) within its linear operating range. Moreover, the application of harmonic summation formula from IEC 61000-3-6 in WPP's harmonic studies can provide unreliable results because this standard ignores the phase angle variation of complex harmonic currents. Hence, the detailed studies are done in time and frequency domains to provide adjusted a-exponent to the IEC 61000-3-6 summation rule. To validate the outcome, three different analysis methods are used and compared: (i) frequency domain model based on new TFs; (ii) time domain model based on detailed dynamic simulations performed in MATLAB/SIMULINK where different Power Bins (PBs) are assigned to WTs; (iii) harmonic current source model according to the IEC 61000-3-6 summation rule with standard and adjusted a-exponents. [ABSTRACT FROM AUTHOR]

Published
2019

44. Hybrid railway power quality conditioner based on half-bridge converter and asymmetric balanced traction transformer with deadbeat current control.

Author

Roudsari, Hossein Mahdinia, Jalilian, Alireza, and Jamali, Sadegh

Subjects
CURRENT transformers (Instrument transformer), HYBRID power, VOLTAGE control, ELECTRIC power distribution grids, ELECTRIC transformers, BRIDGES, HYBRID electric vehicles, RAILROADS
Abstract

AC electrified railway system is a huge single-phase load, which causes significant power quality (PQ) problems to the upstream power grid. Active railway PQ conditioners (ARPQC) have been introduced to overcome the PQ problems. One of the most important complications of the ARPQCs is its high VA rating which entails significant escalation in the price of the conditioner. To mitigate the rating of the ARPQC, a hybrid configuration including an asymmetric balancing traction transformer and a half-bridge railway PQ conditioner (HBRPC) is proposed in this study. The predictive deadbeat current control with low computational burden and fast dynamic response is used to optimise the performance of the HBRPC. Additionally, a PI adaptive gain controller is proposed for DC-link voltage stabilisation, which minimises the negative impact of the voltage control on the current control stage. The feasibility and functionality of the proposed scheme is validated via simulation and experimental results. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results