Department of Electrical and Electronics Engineering

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Author: search.filters.author.Patel, AshishSubject: search.filters.subject.Power Angle Control (PAC)

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    A Simple Approach to Improvement in Performance of UPQCDG in presence of Unbalanced Load
    (IEEE, 2017) Bhanot, Surekha; Mathur, Hitesh Datt; Patel, Ashish
    In this paper, an improved Power Angle Control (PAC) method for UPQC-DG has been proposed for effective compensation of unbalanced loads. UPQC-DG provides a simultaneous solution to power quality and renewable integration. PAC methods have been developed for UPQC-DG to enhance VA utilization of series and shunt APFs of UPQC-DG. In case of unbalanced loads, existing PAC methods result in circulation of reactive power and increased VA loading of UPQC-DG. PAC method proposed in this work, is designed to tackle above-mentioned issues. Also, proposed PAC method is based on Synchronous Reference Frame (SRF) theory, which makes it robust to non-ideal voltages. Performance of proposed PAC method has been tested using real time simulation performed in Opal-RT. Simulation results show superior performance of UPQC-DG in presence of unbalanced and non-linear loads using proposed PAC method.
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    Study on Comparison of Power Losses Between UPQC and UPQC-DG
    (IEEE, 2022) Mathur, Hitesh Datt; Yadav, Sisir Kumar; Patel, Ashish
    In the era of modern power distribution network, the motivation to use green and clean energy resources for fulfilling the need of energy demand is gaining abruptly. This has enhanced the use of power electronics-based conversion devices leading to deterioration of power quality in the power distribution network. Several compensating custom devices, such as static compensators (STATCOMs), dynamic voltage restorers (DVRs), and unified power quality conditioner (UPQC), etc., have been developed in recent decades. UPQC consists of shunt active power filter (APF) and series APF connected in back-to-back fashion with a shared DC-link. In the case of UPQC-DG, a distributed generator (DG) is also connected at the DC-link. In the existing literature available, UPQC integrated with DG is found to be a promising topology which can simultaneously compensate for power quality issues and integrate DG into the grid. Its functionality and performances have been presented by many researchers, but a detailed investigation on its power losses is missing. This article presents a detailed comparison of conventional UPQC, UPQC-DG, and UPQC-independent DG (UPQC-IDG) in terms of their respective power losses and further enhances the criteria for selecting the best possible configuration to be used practically based on requirements and economical viability. In this executed work, the power losses are compared among UPQC, UPQC-DG, and UPQC-IDG for different steady-state and dynamic operating conditions. The power losses in all configurations are inclusive of conduction losses, filtering losses, and switching losses, found using simulation and empirical studies. The comparative study is based on computer simulations performed in MATLAB/Simulink and real-time simulation using Opal-RT.
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    A new and simple SRF based power angle control for UPQCdg to integrate solar PV into grid
    (IEEE, 2017) Mathur, Hitesh Datt; Bhanot, Surekha; Patel, Ashish
    In this paper, a new Power Angle Control (PAC) method for Unified Power Quality Conditioner with Distributed Generation (UPQC DG ) is proposed for effective grid integration of solar PV. In UPQC DG shunt Active Power Filter (APF) feeds power from solar PV to load, apart from supplying reactive power demand, leading to increased rating of shunt APF. PAC method aims at effective utilization of series and shunt APFs of UPQC DG to reduce their ratings. In this work a new power angle estimation method based on instantaneous power calculation is proposed. Proposed estimation technique is simple, robust and utilizes already available measurements of UPQC DG . Performance of proposed system is tested in the presence of non-linear and reactive loads with detailed model of solar PV generation system. Dynamic performance of system is studied during grid disturbances such as voltage sag and swell, solar irradiation variation, and change in load. MATLAB/Simulink based simulations validate effectiveness of proposed method.