Ahmed Elasser
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View article: Flexible transformer system
Flexible transformer system Open
A system includes conductive windings extending around a magnetic core and impedance-varying windings extending around the magnetic core. The impedance-varying windings include positive windings and negative windings. The conductive windin…
View article: System and method for design and optimization of grid connected photovoltaic power plant with multiple photovoltaic module technologies
System and method for design and optimization of grid connected photovoltaic power plant with multiple photovoltaic module technologies Open
A system and method of using one or more DC-DC/DC-AC converters and/or alternative devices allows strings of multiple module technologies to coexist within the same PV power plant. A computing (optimization) framework estimates the percent…
View article: Methods for locating ground faults and insulation degradation condition in energy conversion systems
Methods for locating ground faults and insulation degradation condition in energy conversion systems Open
Methods for determining a ground fault or insulation degradation condition within energy conversion systems are described. A method for determining a ground fault within an energy conversion system may include, in part, a comparison of bas…
View article: DC to DC power converters and methods of controlling the same
DC to DC power converters and methods of controlling the same Open
A power generation system configured to provide direct current (DC) power to a DC link is described. The system includes a first power generation unit configured to output DC power. The system also includes a first DC to DC converter compr…
View article: Switching coordination of distributed dc-dc converters for highly efficient photovoltaic power plants
Switching coordination of distributed dc-dc converters for highly efficient photovoltaic power plants Open
A distributed photovoltaic (PV) power plant includes a plurality of distributed dc-dc converters. The dc-dc converters are configured to switch in coordination with one another such that at least one dc-dc converter transfers power to a co…
View article: Machine Learning-Based Cyber-Attack Detection in Photovoltaic Farms
Machine Learning-Based Cyber-Attack Detection in Photovoltaic Farms Open
In this article, a machine learning technique is proposed for the detection of cyber-attacks in Photovoltaic (PV) farms using point of common coupling (PCC) sensors alone. A comprehensive cyber-attack model of a PV farm is first developed …
View article: Converter-Interfaced CHP Plant for Improved Grid-Integration, Flexibility and Resiliency
Converter-Interfaced CHP Plant for Improved Grid-Integration, Flexibility and Resiliency Open
GE Research and its partner GE Renewables have proposed the use of an interface converter solution to increase the penetration of small to medium-sized CHP (1MWe to 20MWe) into distribution grids and improve their flexibility and grid supp…
View article: Sensitivity analysis of the technical and economic feasibility of converter-interfaced CHP System
Sensitivity analysis of the technical and economic feasibility of converter-interfaced CHP System Open
The adoption of small-to-medium sized (1MW~20MW) combined heat and power (CHP) system is lagging, especially in industrial and commercial applications. Our prior research has proved that interfacing CHP with grid-ready converters can incre…
View article: A Review of Cyber–Physical Security for Photovoltaic Systems
A Review of Cyber–Physical Security for Photovoltaic Systems Open
In this article, the challenges and a future vision of the cyber-physical security of photovoltaic (PV) systems are discussed from a firmware, network, PV converter controls, and grid security perspective. The vulnerabilities of PV systems…
View article: Integration Study of Converter-Interfaced Combined Heat and Power Plants
Integration Study of Converter-Interfaced Combined Heat and Power Plants Open
Combined Heat and Power (CHP) systems, as a proven technology, provide numerous benefits to the plant owner by saving electricity bill, reducing carbon dioxide emissions, and improving electricity service reliability. However, their integr…
View article: Harmonics and Stability Evaluation of Converter-Interfaced Combined Heat and Power Units
Harmonics and Stability Evaluation of Converter-Interfaced Combined Heat and Power Units Open
Grid integration of medium-sized combined heat and power (CHP) units is challenging due to strict grid codes and conventional generators lack of control flexibility to meet these grid codes. Adding a two-stage ac-dc-ac power electronics in…
View article: Feasibility Analysis of Converter-Interfaced Combined Heat and Power System
Feasibility Analysis of Converter-Interfaced Combined Heat and Power System Open
As a promising new design concept, the converter-interfaced combined heat and power (CHP) system is coupled to the bulk grid through a rectifier and a grid-ready tied inverter. Compared to the traditional directly-coupled CHP system, it re…
View article: Grid Ready, Flexible Large Power Transformer
Grid Ready, Flexible Large Power Transformer Open
GE Research and its partner Prolec GE have proposed a novel and breakthrough concept to improve the flexibility and interchangeability of large power transformers (LPTs). LPTs refer in this report to transformers with a power rating equal …