(Remote Energy Visibility and Optimisation)
For Yorkshire Water Services Limited
Project Value £700,000
Yorkshire Water spends over £50m per annum on electricity, of which, 75% is due to consumption during high tariff periods.
Blackburn Starling was nominated by Yorkshire Water to provide the PLC and SCADA software implementation for the project working directly for Morgan Sindall Grontmij Joint Venture (MGJV). The innovative controls enable Yorkshire Water’s operatives to profile when they use high energy consuming assets around the cheapest electricity tariffs. The controls can also be used to identify the most efficient assets to run, saving both money and energy. REVO has been installed on a range of clean water and waste water sites to utilise the most cost-effective tariffs throughout the day. The scheme has successfully delivered savings for Yorkshire Water across 60 sites.
The rationale behind the REVO scheme is to reduce energy consumption and cost by use of enhanced PLC control functions. The projects aim was to confirm and exploit these efficiency opportunities providing improved energy efficiency by automation control and so reducing power costs. Exploitation of functionality within the recent generations of PLC offers the opportunity to operate installations at greater efficiency. The existing control systems used a simple reactive system. By using an intuitive system REVO changes would result in higher energy efficiency rates.
Site surveys and control systems investigations were carried out across 80 sites to confirm functionality of the current control systems and determine what the feasibility for REVO implementation and what possible energy efficiency and savings could be achieved.
In order to establish the most efficient method of optimising a particular process, the REVO system provides a multi-configurable time based control mode selection function. The operator will be able to select six specific time bands, two green, two amber and two red, within a 24 hour period, with each band representing an electrical tariff period.
In addition, during the year YEDL issue TRIAD warnings for specific periods of peak demand. During these periods, which vary year on year, the electrical tariff costs rise significantly. The operator will be able to enter Dates and Times for the PEAK Periods.
Within each time band or PEAK Period there are options to configure the process specific control modes and interlocks. A process specific control mode (Mode) can be enabled or disabled and will facilitate control of the process via adjustable operational parameters. A process specific interlock is a method of ensuring that process compliance cannot be compromised. By combining different modes and interlocks for the time bands or PEAK Periods the operator has the flexibility to control the process to an optimum and thus reduce energy consumption.
The REVO system needs to be applied to different processes on both clean and waste water sites to generate the most energy savings. Therefore, each process will have a Process Specific Selection interface to further optimise the control. For example, an ASP plant contains several aeration lanes which are typically controlled by modulating the blower speed and aeration valves to maintain dissolved oxygen (DO) content to a setpoint. To optimise the control for energy reduction at peak tariff times it was possible to implement a control mode which reduces the DO setpoint for the Front pocket of each lane to zero whilst maintaining normal control of the Rear pocket of each lane to ensure compliance.
In July 2014 MGJV were awarded the Innovation Award for REVO at the prestigious Constructing Excellence Yorkshire & Humber 2014 awards. The success of REVO was recognised again in April 2015 at the annual Environment and Energy Awards when Yorkshire Water was presented with the Innovative Water Management and Efficiency Project award.