Iraj Rahimi

• Represent Canada in the Study Committee meetings and participate in different study committee’s tasks such as establishing new Working Groups • Review the reports and technical brochures produced by CIGRE Working Groups • Disseminate the information from the Study Committee to the Canadian members of CIGRE • Approve Canadian members to the Study Committee Working Groups

• Lead power system studies to develop weekly transmission outage contingency plans • Lead operational planning studies to identify existing/anticipated operational issues and liaise with internal teams and the system operator to develop and execute mitigation plans • Provide technical direction to Control Center operators to resolve real-time system concerns • Develop and maintain transmission system and substation operating procedures • Provide support to projects team and review projects documents (from planning to execution) to ensure potential operational concerns are identified and addressed • Develop staging plans for the integration of major projects into the system • Prepare and conduct Control Center Operators’ training sessions • Conduct transient studies (PSCAD) to investigate major disturbances in the system • Participate in cross functional initiatives such as Line Clearance Mitigation program and Wildfire Mitigation program • Act as the manager of system operations engineering and outage scheduling team as required • Represent AltaLink at national and international technical working groups such as Alberta DER Technical Performance Exploration Group (TPEG), Alberta Gas/Electric Technical Working Group for Extreme Weather Events, Alberta DER Real-Time Modeling, Monitoring, and Cybersecurity working group, North American Transmission Forum, and CIGRE working groups

• Provide direction and support to the Operator on weekend and night shifts, assist with decision making and ensure necessary manpower and resources are in place to deal with real-time issues • Inform and coordinate with internal and external stakeholders of pertinent operational issues • Make decisions on trouble response level of real time events and coordinate with Field Operation Managers to execute urgent response repairs • Identify and declare ERP (emergency response plan), and take on the role of Emergency Commander

• Analyzed disturbances in AltaLink power system to verify the correct operation of protection and control systems • Supported AltaLink control center during system disturbances to ensure timely restoration of power system equipment, load and generation • Provided customer support post system disturbances to assist customers in resolving their reliability issues

• Led conceptual planning and system impact studies for major load and generation connections (including multiple wind/solar farms) • Conducted various system transient studies including lightning/switching overvoltages for insulation coordination, transient recovery voltages (TRV) to check breakers capability, temporary overvoltages (TOV) for arrester assessment, and capacitor/cable inrush/outrush switching • Conducted frequency response, and harmonic studies for various capacitor bank and cable addition projects and proposed mitigation measures such as harmonic filters • Studied the impacts of underground cables on system harmonics using simulations and measurements • Proposed cost-effective innovative anti-islanding schemes for DER projects and RASs for load/generation connection projects • Participated in an interdepartmental teamwork and prepared a report to support required long term plans in Strathcona area with respect to system reliability, impacts on industrial customers, environment, etc. • Conducted steady-state and dynamic studies for a PST (phase shifting transformer) Automatic Control and proposed optimal control settings in coordination with Remedial Action Schemes of wind generations • Developed guidelines to model various power system components including modeling of Altalink’s existing surge arresters for transient studies, and modeling of renewable energy resources (wind and solar) for dynamic studies • Developed methods/guidelines for calculating the discharge characteristics of power lines with underground cables and overhead sections to be reflected in the operating procedures (such as deadtime for reclosing) • Mentored junior engineers

1- Power System Planning: o Performed conceptual planning and system impact studies for major load and generation connections o Prepared PDUPs (required data for PSSE models) for many projects (lines, transformers, generators) o Conducted frequency response, and harmonic studies for various capacitor bank addition projects and proposed mitigation measures o Prepared functional specification for C-Type filters such as Engstrom 30MVAr and Quigley 30MVAr o Conducted interconnection studies for distributed generators (DG) in CYME and EMTP for six projects (3MW- 20MW), and prepared interconnection assessment and P&C requirement documents o Studied temporary overvoltages (TOV) caused by DG islanding to assess the arrester capability and determine the anti-islanding time setting for several projects o Conducted engineering studies and defined required specification for planned series capacitors o Performed motor start studies to assess the effect of large motors being added to the system o Prepared annual harmonic reviews for ATCO Electric substations and proposed mitigation measures 2- Operational Support: • Participated in performance testing of Arcenciel Synchronous condenser (+50/-30 MVAr) • Participated in operational planning studies for a 500kV HVDC line (EATL) • Conducted transient overvoltage studies in EMTP and assisted with safety policy for live-line work • Estimated the insulator strength and assessed flash over conditions according to EMTP study results • Developed, maintained and verified ATCO Electric transmission system model in PSS/E and EMTP • Provided technical support to System Operations, Maintenance, Engineering etc.

Power systems voltage stability analysis & monitoring, project for BC Hydro • Proposed a new modal-based framework for voltage stability analysis and monitoring • Developed effective methods to identify loads, generators, and transmission lines which are weak with respect to voltage stability • Performed voltage stability studies on the Alberta Integrated Electric System (AIES) using PSS/E Advanced load shedding scheme, project for Alberta Power Industry Consortium (APIC) • Assessed the transmission capability of the Alberta Interconnected Electric System (AIES) • Participated in designing an advanced load shedding scheme to prevent voltage collapse in AIES Power systems dynamic analysis using a new modal transformation, project for BC Hydro • Investigated the application of a new modal transformation to angular stability analysis Frequency-dependent modeling of power networks, project for Electric Power Research Institute (EPRI) • Developed an algorithm to construct equivalent circuits for impedance scan results • Conducted analyses on several impedance scan results obtained from actual power networks Trip grounding; problems and improvements, project for Alberta Power Industry Consortium (APIC) • Conducted a survey on temporary grounding practices and trip grounding problems • Reviewed and investigated the methods used by industries to overcome the problems

• Investigated preliminary single line diagrams and selected switchgear components • Participated in preparing cost estimate for clients • Developed equipment layout drawings of switchgears • Investigated equipment test reports, and calculated required characteristics

• Instructed several undergraduate courses such as Power systems analysis I and II, Power systems protection, High voltage substation design, and Electrical circuits I and II

Transient stability enhancement in Tehran transmission system using system protection schemes (SPS) • Modeled the Tehran transmission system in DIgSILENT, and performed transient stability studies • Designed a generator rejection scheme (GRS) to prevent transient instability Instability risk reduction in Tehran transmission system using FACTS • Evaluated the instability risk (in terms of $/hr) in Tehran transmission system • Investigated the effect of using FACTS in reducing the instability risk

• Participated in selecting switchgear components based on the ratings and the inventory • Participated in preparing cost estimate for clients