Publications

 Authors: Sergio Escareno, Sijo Augustine, Liang Sun, Sathishkumar J Ranade, Olga Lavrova, Enrico Pontelli, John Hedengren
Publication date: 2026/1/14
Journal: Energies
Volume: 19
Issue: 2
Pages: 406
Publisher: MDPI
Description 
Transitioning from traditional electrical grids to smart grids is currently an ongoing process that many nations are striving for due to their access to renewable resources. Energy management is one of the key parameters that decides the performance of such complex systems. Distributed Model Predictive Control (DMPC) is a promising technique that can be used to improve the energy management of grid-connected systems. This paper analyzes a grid-connected inverter system with DMPC that exchanges key operating parameters with the grid to optimize coordinated power sharing between its respective loads. The state-space model for the inverter is derived and verified to ensure controllability and observability. A state observer for an inverter system is then developed to estimate the nominal states in the derived state-space model. The system performance is evaluated with MATLAB simulation by implementing load disturbances, which validate the effectiveness of the proposed power management control algorithm.

 Authors: Huzaifa Karimjee, Satish Ranade, Deepak Ramasubramanian, Olga Lavrova

Publication date: 2025/5/7
Journal: IEEE Transactions on Energy Conversion
Publisher: IEEE
Description
The increasing penetration of inverter-based resources (IBRs) necessitates a reassessment of current grid practices. Blackstart is one specialized area that has drawn renewed attention due to the capability of grid-forming inverters (GFMIs) to emulate synchronous generators (SG). The ability of IBRs to carry out a blackstart represents a novel concept necessitating deeper investigations, particularly given the constraints of IBRs such as over-current limitations, which affect the energization of non-linear network devices. This paper presents a blackstart case study that uses a GFMI, focusing on the energization of a large unloaded plant transformer. Consequently, a unique inrush is demonstrated, known as a sympathetic inrush between the plant and the inverter medium-voltage (MV) transformer. Subsequently, an alternative method for the execution of soft energization (SE) is introduced using a power plant controller …
Authors: Israel Joukhadar, Mariela Estrada, Ciro Velasco-Cruz, Danise Coon, Olga Lavrova, Marisa Thompson, Ivette Guzman, Stephanie Walker
Publication date: 2025/6/1
Journal: HortScience
Volume: 60
Issue: 6
Pages: 841-851
Publisher: American Society for Horticultural Science
Description
Curtovirus spp., a group of widely distributed geminiviruses, are among the most significant plant pathogens in the United States. Beet curly top virus (BCTV), vectored by the beet leafhopper [ Circulifer ( Neoaliturus ) tenellus Baker], causes severe economic losses in crops such as tomatoes, peppers, dry beans, sugar beets, melons, and leafy greens, particularly in the western United States. In New Mexico, chile ( Capsicum annuum ) is vulnerable, with infected plants exhibiting symptoms such as stunting, chlorotic and curled leaves, misshapen fruits, reduced yields, and plant death. Yield losses can reach up to 50% in some years. Current management strategies, including pesticide applications, provide limited protection, leaving growers with substantial losses. Research indicates beet leafhoppers prefer full sun and avoid shaded areas, suggesting potential for innovative pest management strategies. 
Authors: Jose Martinez, Olga Lavrova, Satish Ranade
Publication date: 2025/2/10
Conference: 2025 IEEE Texas Power and Energy Conference (TPEC)
Pages: 1-6
Publisher: IEEE
Description
This paper constructs a small signal linear state space of an Inverter-Based Resource (IBR) blackstarting an induction motor (IM), given that no such state space was found in existing literature. MATLAB Simulink™ serves as the primary simulation platform. This small signal state space will only be valid for small disturbances around a desired point of linearization. The approach is to derive the state space model for an IBR feeding a resistive load as an initial step. Taking this as a base state space model, the resistor is then replaced with an induction motor, and induction motor equations with linearized slip are incorporated to the state space. The resulting state space model will then be tested against non-linear Simulink modeling tools to test validity. Although current limit capabilities are not included in the model, a discussion of how to do this is given. The resulting state space serves as a base model to perform …
Authors: Agaba Ame-Oko, Olga Lavrova, Leon Viveros
Publication date: 2025/2/10
Conference: 2025 IEEE Texas Power and Energy Conference (TPEC)
Pages: 1-6
Publisher: IEEE
Description
Hosting capacity (HC) is a topical issue given the increasing penetration of distributed energy resources like photovoltaic (PV) in power distribution networks. The minimum HC of a distribution feeder is valuable information for distribution system operators (DSOs) for interconnection request purposes. This information provides the maximum amount of PV a feeder can accommodate anywhere in the network such that no further site-specific studies are required for an interconnection request whose size is equal to, or less than this minimum HC. In determining the minimum HC in this study, centralized and distributed HC analyses of PV interconnections in a test case of an existing distribution feeder based on five network parameters - voltage, voltage deviation, regulator deviation, line loading, and reverse power flow were calculated at peak and off-peak loading conditions of the feeder. Multiple HC scenarios were …
Inventors: Sigifredo Gonzalez, Jack David Flicker, Todd Monson, Eric Langlois, Nicholas Sonny Gurule, Olga Lavrova
Publication date: 2025/1/14
Patent office: US
Patent number: 12196784
Application number: 17577453
Description
A method and system for determining the state of one or both of an electrical conductor or an associated system utilizing a non-invasive sensor and a magnetostrictive response from the current of the electrical conductor. The method includes providing a sensor assembly including a magnetostrictive resonator sensor and a signal detector. A state of one or both of the electrical conductor or the associated system is determined with the fault detector in response to a first frequency profile and a second frequency profile obtained with the magnetostrictive resonator sensor. A fault monitoring system utilizing a magnetostrictive resonator sensor is also disclosed.