Generator Interim Access (GIA) is a generator connection solution introduced by Western Power to allow new generators to be connected to the SWIS at low costs under a constrained access arrangement. With more GIA generators being connected and new network limitations, GIA generators are being constrained more often. This has impacted not only the cost to the energy market but also introduced challenges for AEMO to maintain a stable system frequency and manage sufficient ancillary services, such as load following and spinning reserve. One solution for reducing the impacts is to increase the network capacity by introducing dynamic line ratings in the GIA Tool.

This application of the dynamic line ratings is to dynamically calculate the line ratings, which are based on the ESAA D(b)5 1988 line rating methodology, using real-time ambient temperature data and historical PoE (probability of exceedance) data of solar radiation in GIA constraint equations. The objective is to increase the summer thermal ratings of critical transmission lines to capacity levels similar to their corresponding winter thermal line ratings. The implementation philosophy is to have a non-complicated but reliable and auditable dynamic line rating calculation. This presentation will discuss the implementation and benefits of this dynamic line rating application.

Randy Supangat

Randy Supangat is the Principal Engineer of Network Operations Function at Western Power. His role focuses on the real time operations of the system including providing technical leadership and support to the function, developing operating guidelines for network and customer projects and managing generator commissioning. He also led the development of operating strategies and plans for managing system voltages and reactive power in the SWIS for system low demands due to high DER penetration.

Randy received the Bachelor of Engineering (First Class Honours) degree in 2003 and Ph.D. degree in electrical engineering in 2008 from the University of Adelaide. He is also a Chartered Professional Engineer on the National Engineers Register. He has over 13 years of experience in the power system industry, which has included power system modelling, system analysis, network planning and network operations, across utility and consulting businesses.