"Knowing the natural, historical inflow in regulated systems are crucial for optimal usage of the water resources," says product manager at Powel, Beate Sæther.
Used for both long-term and short-term planning
The solution is used for long-term planning to determine the reservoir disposal based on future prices. It is also used for short-term planning as input to inflow forecast models and input of water coming from upstream regulated flows. Historical inflow is important in production statistics and investment analysis and gives the hydro power producer easy access to updated, quality information about the regulated watercourse such as reservoir volume, production discharge, overflow, bypassed water and historical inflow for all points of interest.
"Another important feature in the solution is that it creates time series for historical inflow seamlessly in time when changing or adding system components," says Sæther.
Flexible and robust calculations
Powel Naturalised Water Balanceis built on state-of-art data management system for flexible, transparent and robust calculationsof input data and results including topology structure modelling.
An integrated simulation function uses measured data from the hydropower system such as historical production in MW, water level in reservoirs, tailwater levels, efficiency curves, head loss factors etc. for calculating the production discharge. This is done as an iterative calculation process.
Easy to search for data
Historical inflow is calculated based on production discharge, changes in reservoir volume, bypass and overflow.
"You have detailed control of all the water in your system and built-in functionality for drill down in calculation dependencies to see what contributes to the results. All calculations are transparent and easy to change without coding and give you the flexibility to utilise all available data to improve the calculation of water flowing through the regulated system," says Sæther.
The data handling is based on object modelling which makes it easy to search for data and takes advantage of template calculations and reports for more consistent and efficient set up and maintenance of your data.
The integrated simulation function uses advance pressure balance calculations to handle reservoirs, creeks and power plants in common junctions for more accurate water usage. It also calculates flow between reservoirs or reservoirs in a common junction with shifting pressure balance and free flow caused by threshold limits or gate regulations.
The production discharge is calculated with time steps down to 1-minute resolution to improve calculation of water usage through the turbines.