Mr. Mohammadali Hayerikhiyavi

The Continuously Variable Series (CVSR) was first introduced more than a century ago. Continuously Variable Series Reactor has the ability to regulate the reactance of an ac circuit using the magnetizing characteristic of its ferromagnetic core, shared by an ac and a dc winding. The dc current controls the saturation of the core, or the self-inductance of the ac winding. This inductance reaches the maximum when the core is not saturated, and the minimum when it is fully saturated. The overall reactance in the controlled ac circuit is changes by the dc current. The ac variable inductance can be used in various purposes, including steady-state power flow control, oscillation damping, fault current limitation, and balancing of load voltages in the system.

In order to understand and utilize a CVSR in the power grid, it is essential to know all of its operational characteristics. The typical approach in modeling of magnetic circuits is to use the electric circuit analogy of Ohm’s Law. This approach results with equivalent circuits that use resistors to represent magnetic reluctances and voltage sources that represent magneto-motive forces (MMFs). These models do not interface directly with the models on the electric side for integrated simulations and study of the overall system. Moreover, there is a contradiction in modeling magnetic cores that store energy with dissipative components like resistors which destroys the energy and power equivalence. In the Gyrator-Capacitor (G-C) model, the analogy between the MMF and the voltage is still kept, but the electric current is analog to flux rate and magnetic permeance is analog to capacitance. This model forms a direct link between the electrical and magnetic circuits, which makes it robust and convenient for integrated study of systems with power magnetic devices. For precise and accurate model, the magnetic component nonlinearities such as core saturation and hysteresis are considered in the model.

Biography:

Mohammadali Hayerikhiyavi received the B.S. and M.S. degree in electrical engineering from Amirkabir University of technology, Tehran, Iran in 2016 and 2019, respectively. He is currently a PhD candidate in Electrical Engineering at University of Central Florida. His research interest includes modeling, analysis, and of magnetic power control devices, along with power system analysis, and protection.

Aaron Staley, PE

This course will start with framing the requirements from the NERC TPL standards along with the observed real time behavior of the system.  Using that information, it will cover how to develop the scenarios and contingencies to examine and how to translate that information into the constraints on the transmission grid.  Combining those constraints with the utilities risk tolerance and realities of construction then translates into a plan for capital projects.

Biography:

Aaron Staley, PE, is currently the Manager of Transmission Planning & Reliability with Orlando Utilities Commission. He graduated from the University of Florida in 1997 with a BSEE and in 2005 with a degree in Engineering Management. He has worked street lighting, distribution design, power quality, combustion turbine electrical support systems, and since 2006 has been focused on Transmission Planning.  He has participated in and taken leadership roles in technical groups related to Transmission Planning at the local, regional and national level. Aaron regularly put together educational programs for internal staff, local IEEE meetings, and regional training either as a coordinator or an instructor.  Currently Mr. Staley’s team is responsible for state estimation, real time contingency analysis, operations planning, transmission planning, generation interconnections, transmission service requests, OATI Oasis/webtrans tools, and ATC (TTC) calculation.  Aaron has been in a leadership role with the Orlando IEEE PES/IAS/PEL joint chapter since 1997 and is currently the co-treasurer.