MANAGING THE TRANSMISSION BOTTLENECKS
The installation of new transmission assets does not always match the increase in energy demand and generation due to economic, environmental, or feasibility reasons. Furthermore, with renewables and distributed energy generation as a trend, transmission system operators face a real challenge to attend to these increasing loads in the already stressed nodes of the power grid.
An efficient technique that limits this issue is the use of dynamic line ratings. By taking into consideration information on the mechanical and electrical status of the line and on the topographic and weather conditions, the real transmission capacity of the line can be calculated, while complying with the applicable regulatory and safety restrictions. E-DLR can integrate and process all this information, providing real-time and predicted line ratings, clearly above seasonal or static ratings, and identifying the critical spans.
DIGITAL TWIN SOLUTIONS
KEY OUTCOMES
  • Maximization of the transmitted power
  • Reduction of CAPEX investments in new transmission assets
  • Availability increase
  • Enhanced operational flexibility
MAIN FEATURES
  • Weather dependent operation
  • Real-time and predictive transmission capability
  • Compliance with safety requirements and regulations
  • Risk management of thermal and electrical limits
HOW DOES IT WORK
Enline uses electrical data acquired from the automation network or a control center that gathers electrical phasors of the sub-stations connected by the transmission line. Besides the electrical information of the substations, the software computes several thermal contributions that affect the cable temperature and sagging.

The weather data hub combines different weather sources acquired from virtual and/or physical stations, third suppliers and other sources that comply with the digital twin parametrization requirements. In addition, electromechanical characteristics of the transmission line such as cable resistance, topography and tower geometry are considered, span per span and cable per cable, so
the digital twin can simulate the electromagnetic behavior of the installation along with the time and distance.

Enline server gathers several inputs and computes a digital twin of the transmission line. The computation strategies vary from cloud structuring and dedicated servers installed and the substations or an operating control center.

The output of E-DLR is real-time and forecast of the maximum allowed power of a transmission line with customized parametrization automatically set by the operator.
DATA INTEGRATION
The digital twin is an economical solution to implement DLR in transmission lines. Enline has great flexibility to combine and integrate existing monitoring solutions, and it minimizes the need for physical sensors and weather stations, being capable of working with no local sensors at all.
Nevertheless, E-DLR can incorporate into its platform sensor data if required by the client. It can also integrate other substation monitoring systems from equipment such as transformers, circuit breakers, or weather stations.
E-DLR MARKET COMPARISON
SENSOR BASED SOLUTIONS
. Physical sensor.
. Requires field installation.
. De-energization required.
. Long implementation period.
. Expensive sensor-related maintenance.
ENLINE DIGITAL TWIN
. Digital Twin technique.
. Remote installation.
. No de-energization required.
. Can be implemented within days.
. No maintenance, regular automatic updates.
COMPUTING ARCHITECTURE
E-DLR is designed to be very flexible in its installation and operation, it is easily adapted to the existing facilities and can be integrated into available digital automation networks. The customer can install E-DLR using different architectures:
Industrial Internet of Things gateway ( IIOT )
  • Cloud servers with both end substations connected to the internet using the Enline Industrial Internet of Things Gateway.

  • Dedicated server installed at one of the end substations if they are communicating via hardwire facilities like optical ground wire.

  • A dedicated server installed at the control center that gathers the electrical data from the substations.
IMPACT RENEWABLES AND DISTRIBUTED ENERGY GENERATION
The energy mix is becoming increasingly dominated by renewable energy resources. Renewable power technologies consist mainly of wind and photovoltaics, which are characterized by high volatility, limited control over the power output, and difficulty in forecasting the power generation. Renewable energy resources also tend to be distributed throughout the power grid. This new generation paradigm requires increased operational flexibility from the transmission system operators, E-DLR can support them in this matter.