@article{dsouza_muthukaruppan_yu_baran_lukic_vukojevic_2022, title={Assessment of Anti-Islanding Schemes on a Distribution System with High DER Penetration and Dynamic VAR Compensators}, ISSN={["2329-5759"]}, DOI={10.1109/PEDG54999.2022.9923268}, abstractNote={The recently introduced power-electronics-based dynamic VAR compensator (DVC) offers an effective solution in mitigating the impacts that high penetration distributed energy resources (DERs) have on distribution systems. One of the concerns about adopting these devices is their impact on distribution system protection, especially islanding detection. This paper proposes a hardware-in-loop (HIL) test-bed based approach to investigate the performance of islanding detection schemes on a distribution feeder. This approach facilitates the assessment of protection system performance under more realistic conditions by emulating actual devices and a distribution system. The results are based on an actual case study that is outlined to show the effectiveness of existing passive anti-islanding schemes and assess the impact of a DVC on islanding detection.}, journal={2022 IEEE 13TH INTERNATIONAL SYMPOSIUM ON POWER ELECTRONICS FOR DISTRIBUTED GENERATION SYSTEMS (PEDG)}, author={DSouza, Keith and Muthukaruppan, Valliappan and Yu, Hui and Baran, Mesut and Lukic, Srdjan and Vukojevic, Aleksandar}, year={2022} }
 @article{dsouza_baran_vukojevic_2022, title={Maximizing the Benefits of Dynamic VAR Compensators on Distribution Systems with High Penetration PV}, ISSN={["2329-5759"]}, DOI={10.1109/PEDG54999.2022.9923214}, abstractNote={High penetration of solar photovotaic systems (PVs) in a distribution system can impact its operation considerably, causing issues like voltage violations, voltage flicker, increase in system losses and excessive regulator operations. Recently, power- electronics-based Dynamic VAR Compensators (DVCs) have been developed as an effective solution to mitigate these issues caused by PVs. In order to assess the benefits of DVCs (and other such devices), this paper first introduces metrics to quantify the main benefits a DVC offers, such as a reduction in tap operation, voltage variation, voltage flicker, etc. This paper also proposes a methodology to properly place and dispatch the DVC to maximize these benefits. The case study presented illustrates the effectiveness of the proposed methodology and highlights the achievable benefits. The results indicate that it is possible to obtain multiple benefits from a DVC in distribution systems with high penetration PV.}, journal={2022 IEEE 13TH INTERNATIONAL SYMPOSIUM ON POWER ELECTRONICS FOR DISTRIBUTED GENERATION SYSTEMS (PEDG)}, author={DSouza, Keith and Baran, Mesut and Vukojevic, Aleksandar}, year={2022} }
 @article{gan_shahidehpour_guo_yao_pandey_paaso_vukojevic_wen_2022, title={A Tri-Level Planning Approach to Resilient Expansion and Hardening of Coupled Power Distribution and Transportation Systems}, volume={37}, ISSN={["1558-0679"]}, DOI={10.1109/TPWRS.2021.3107402}, abstractNote={Natural disasters which include major storms, floods, tornados, and hurricanes can seriously threaten the resilience of large and coupled infrastructures such as electric power distribution and transportation systems. This paper proposes a planning (i.e., investment + operation) method for enhancing the resilience of coupled power distribution and transportation systems. The proposed investment method includes capacity expansions of power lines, roads, and charging stations, and the hardening of roads and power lines. A tri-level problem is proposed and formulated to accommodate random natural disasters. The proposed model is solved by applying the Benders decomposition and the column-and-constraint generation (C&CG) algorithms. Benders decomposition will decompose the tri-level coupled problem into a single-level master problem and a bi-level subproblem. However, the latter with binary variables is not a convex problem and cannot be converted to the maximization problem. The C&CG algorithm is applied to solve the bi-level subproblem with binary variables. The proposed resilience enhancement algorithm is tested using a coupled power distribution and transportation system with 21 electric buses and 20 roads and numerical results are analyzed to validate the effectiveness of the proposed planning method.}, number={2}, journal={IEEE TRANSACTIONS ON POWER SYSTEMS}, author={Gan, Wei and Shahidehpour, Mohammad and Guo, Jianbo and Yao, Wei and Pandey, Shikhar and Paaso, Esa Aleksi and Vukojevic, Aleksandar and Wen, Jinyu}, year={2022}, month={Mar}, pages={1495–1507} }
 @article{vukojevic_lukic_white_2020, title={Implementing an Electric Utility Microgrid: Lessons learned}, volume={8}, ISSN={["2325-5889"]}, DOI={10.1109/MELE.2019.2962887}, abstractNote={In recent years, weather events, such as hurricanes, have caused prolonged power outages and significantly impacted the economy due to the damage to the electric utility infrastructure. To increase the resiliency of the electric power grid, microgrids started to become a preferred solution. Unlike traditional generation plants that consist of synchronous-based units, the majority of recently installed generation has been in the form of inverter-connected renewables (solar, wind, battery, etc.), resulting in significant operational challenges for the distribution system due to the intermittent nature of these distributed energy resources (DERs). Traditional electric utility systems effectively control field devices, such as capacitors and voltage regulators, which have delays associated with their operation. However, due to the traditional centralized architecture of electric power systems in general, effective real-time control of renewables is challenging due to the time it takes for changed field conditions to be identified within the centralized control system. In such cases, by the time the centralized system is ready to issue the operating command, the field operating conditions have changed. The issued operating command does not optimize the performance of the subject DER, which has led to work on localized control systems and operations. To provide localized control, secure local data access, interoperability, and distributed intelligence are key enabling factors for faster adoption of DERs and optimized control.}, number={1}, journal={IEEE ELECTRIFICATION MAGAZINE}, author={Vukojevic, Aleksandar and Lukic, Srdjan and White, Leonard W.}, year={2020}, month={Mar}, pages={24–36} }
 @article{vukojevic_lukic_2020, title={Microgrid Protection and Control Schemes for Seamless Transition to Island and Grid Synchronization}, volume={11}, ISSN={["1949-3061"]}, DOI={10.1109/TSG.2020.2975850}, abstractNote={Microgrid transitions to islanded mode and grid synchronization can be designed either as seamless transitions or as a black-start. Secure and reliable seamless transition represents one of the most challenging engineering tasks during the microgrid design phase. Existing literature has several shortcomings - proposed microgrids are either ungrounded or not effectively grounded; DER transformer configurations are not properly implemented; communications within the microgrid do not reflect realistic time delays and there is very little discussion of the impact of relay protection settings on the proposed microgrid protection. This paper presents a new microgrid protection and control scheme that enables seamless islanding and grid synchronization using the point of common coupling (PCC) breaker relays, battery energy storage system (BESS) inverter controller and remote input/output mirror bits based communications approach (85RIO). All schemes have been implemented in the field within the electric utility’s microgrid installed on the 12.47kV distribution feeder. The results presented in this paper are based on approximately 9,000 islanding and grid synchronization transitions.}, number={4}, journal={IEEE TRANSACTIONS ON SMART GRID}, author={Vukojevic, Aleksandar and Lukic, Srdjan}, year={2020}, month={Jul}, pages={2845–2855} }