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DTSTART;TZID=America/New_York:20211029T100000
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DTSTAMP:20260523T223428
CREATED:20211020T191027Z
LAST-MODIFIED:20211020T191027Z
UID:5250-1635501600-1635505200@ece.northeastern.edu
SUMMARY:ECE PhD Proposal Review: Cesar Antonio Galvez Nunez
DESCRIPTION:PhD Proposal Review: Fault Location in Radial and Meshed Networks Containing Distributed Energy Resources (DERs) \nCesar Antonio Galvez Nunez \nLocation: Microsoft Teams Link \nAbstract: Rapidly increasing numbers of Distributed Energy Resources (DERs) connected to transmission and distribution networks via Inverter Based Power Sources (IBPSs) introduce new challenges in detecting and locating faults. Distribution networks are historically designed to operate as radial systems with unidirectional power flows\, which may no longer hold true due to the presence of large numbers of IBPSs. The commonly used impedance-based fault location methods are no longer reliable due to the limitations imposed by unknown fault resistance\, asymmetry of lines\, and presence of IBPSs\, which need to comply with the new grid codes for Fault Ride Through (FRT) requirements. In this proposal\, a new fault location method that can be used for radial and meshed networks containing DERs and addresses the limitations of conventional methods mentioned above will be introduced. The approach requires a limited number of digital fault recorders (DFR) to be placed in the network and uses the Discrete Wavelet Transform (DWT) to compute the first arrival times of fault-generated traveling waves. The proposal first presents a new two-terminal fault location technique used strictly for radial distribution networks\, and then extends this to the general case of combined transmission and distribution networks with radial or meshed configurations. The method is further extended to be applied to hybrid AC/DC complex transmission grids containing DERs and High Voltage Direct Current (HVDC) lines. Preliminary results will be presented illustrating these methods on typical power grids and fault scenarios.
URL:https://ece.northeastern.edu/event/ece-phd-proposal-review-cesar-antonio-galvez-nunez/
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DTSTART;TZID=America/New_York:20211029T110000
DTEND;TZID=America/New_York:20211029T120000
DTSTAMP:20260523T223428
CREATED:20211028T183932Z
LAST-MODIFIED:20211028T184125Z
UID:5273-1635505200-1635508800@ece.northeastern.edu
SUMMARY:ECE PhD Proposal Review: Ramtin Khalili
DESCRIPTION:PhD Proposal Review: Efficient State and Parameter Estimation in Three-Phase Power Systems \nRamtin Khalili \nLocation: Microsoft Link \nAbstract: As the number of renewable energy sources\, bulk energy storage systems\, and non-conventional loads increase and connect to the power grid not only at transmission but also sub-transmission and distribution levels\, three-phase unsymmetrical network monitoring becomes necessary for reliable operation and control of the overall power grid. The use of modal decomposition of measurement equations has already been shown to simplify the formulation and resulting computational complexity of three-phase state estimation of systems where all the transmission lines are three-phase and fully transposed. When there are untransposed and/or mixed-phase lines\, modal decomposition can no longer fully decouple the three-phase measurement equations. This shortcoming is eliminated by a simple yet practical solution based on the commonly used numerical compensation techniques. Thus\, it enables the application of the powerful decoupling approach to any type of three-phase networks which may contain untransposed or mixed-phase lines and are fully observable by PMUs. This implicit restriction is then removed by using a transformation that enables the use of SCADA measurements which are more commonly available in power grids. Furthermore\, It has been shown that network parameter errors can bias the state estimation solution. Network parameter errors are common due to aging\, changes in the ambient temperature\, human data entry error\, etc. So\, an efficient approach is proposed to detect and correct the network parameter errors in three-phase untransposed transmission lines. Preliminary results to illustrate the performance of the proposed methods and associated algorithms will be presented using different test systems.
URL:https://ece.northeastern.edu/event/ece-phd-proposal-review-ramtin-khalili/
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