Articles & Case Studies

Optimisation of Wessex Water’s Regional Water Supply Grid

Posted: Monday 31st March 2014

Wessex Water has commissioned CSE-Tynemarch Systems Ltd to install an automated, on-line, closed-loop optimal control system to operate their new Regional Water Supply Grid.

The Regional Water Grid is Wessex Water’s largest project under AMP5, designed to meet the challenges of:

× growth in peak demands

× low-flow licence reductions and

× deteriorating raw water quality (particularly nitrates)

The Grid will also improve resilience of the system through better linkage between alternative sources of water.

To maximise the benefit to customers of the new connectivity and capacity provided by the Grid, the auto-pilot optimal control system will be provided by MISER, the CSE-Tynemarch water supply optimisation software.

MISER has been used for many years by Wessex Water as the principal strategic analysis tool for generating monthly water production plans. The MISER optimisation functionality has also been used to optimise the size of enhancements to the supply system to meet demand, such as increasing the capacity of trunk mains. Wessex Water is now extending the use of Miser for implementing automated optimal control.

The new system will make use of the MISER sub-daily pump and valve scheduling module that minimises operating costs whilst maintaining security of supply. MISER will take live information such as flows and reservoir levels, forecast demand over the following few days and control the supply network automatically night and day to meet customer demands, licences and other constraints at minimum cost.

The key objective is to optimise the movement of water from sources through the trunk main and distribution system, to ensure that the supply of high quality water to customers is maintained under a wide range of potential operating and asset availability scenarios. The system will also support Wessex Water in responding to routine, as well as unplanned network events, to prevent or minimise any impact on customers.

A key feature of MISER is that the functionality covers both medium (monthly) to long-term (yearly) resource utilisation (production planning) and short-term sub-daily closed-loop pump control to enable operating cost minimisation and the most cost-effective recovery from unplanned outages.

A long-term contract is in place to provide support and maintenance for the system operated from the control room. The MISER software will be interfaced with the existing Servelec telemetry system provided by sister company CSE-Servelec Ltd.

The initial implementation of the system will be used to monitor and control the Warminster area comprising some 11 reservoirs and 10 sources. Wessex Water personnel will be trained to allow them to extend the MISER models to cover the remaining areas of the water supply system, with the support of CSE-Tynemarch support desk if needed.

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