Controlling the Real World, Examples of Extreme RTC. Bradley Nissley Thursday 24 th November 2015

Transcription

1 Controlling the Real World, Examples of Extreme RTC Bradley Nissley Thursday 24 th November 2015

2 Overview Introduction to Real Time Control (RTC) Extreme RTC examples Melbourne Water Whole of Water Cycle (WOWC) Pressure Sewer System (PSS) Control Strategies Extreme RTC Challenges

3 InfoWorks ICM RTC Real Time Control (RTC) allows the state of ancillary regulator structures, such as pumps, sluice gates and weirs to be changed, according to the state of sensors elsewhere in the network. InfoWorks ICM RTC Editor Window InfoWorks ICM RTC Grid Window

4 Melbourne Water WOWC Pilot Model 27,000 Property 30,361 Buildings 28,400 Buildings with Water and Sewer 25,693 Buildings with rainwater tanks 145,754 Nodes 44,768 Pipes 79,788 Weirs 105,480 RTC Ancillaries 313,736 lines of RTC code

5 RTC Generator Tool

6 RTC Control Sewer Potable Demand Internal Use 3000 L Tank Storm Water Potable for External Use Potable Water

7 RTC Logic Tank Empty From Potable Network From Tank Tank Full From Potable Network From Tank Potable Demand x WC Potable Demand x WC Internal Use Internal Use External Use External Use Total Total

8 Sensitivity Testing 5,000 Property Model (4 day sim) RTC / Flow Set Up Timestep Number RTC Lines Simulation Duration (hr:min) Follow the flow 5 secs 54,903 2:33 Individual Property Discharge Volume & Flow Profiles in RTC code 5 secs 100,356 14:29 Factored Follow The Flow 5 secs 65,506 3:56

9 Sensitivity Testing 5,000 Property Model (4 day sim) Follow the Flow RTC matches flow through dummy subcatchment arrangement One arrangement each for Potable, Internal and External Potable and Tank flows set to sum of applicable profiles Flow set using ICM Waste Water Profiles Short simulation time (~14 hrs for 27,000 properties) RTC / Flow Set Up Timestep Number RTC Lines Simulation Duration (hr:min) Follow the flow 5 secs 54,903 2:33

10 Sensitivity Testing 5,000 Property Model (4 day sim) Individual Water Consumptions with Flow Profile Tables Flow profile as three RTC tables: Potable, Internal and External Average water consumption stored for each house node Each table updatable only in RTC grid/editor Prohibitively long simulation time (~78 hrs for 27,000 properties) RTC / Flow Set Up Timestep Number RTC Lines Simulation Duration (hr:min) Individual Property Discharge Volume & Flow Profiles in RTC code 5 secs 100,356 14:29

11 Sensitivity Testing 5,000 Property Model (4 day sim) Factored Follow the Flow RTC matches flow through dummy subcatchment arrangement One arrangement each for Potable, Internal and External Potable and Tank flows set to sum of applicable profiles Flow set using dimensionless ICM Waste Water Profiles Factors water consumption at each customer point Manageable simulation time (~22 hrs for 27,000 properties) RTC / Flow Set Up Timestep Number RTC Lines Simulation Duration (hr:min) Factored Follow The Flow 5 secs 65,506 3:56

12 Sensitivity Testing 5,000 Property Model (4 day sim)

13 Applications for Control Strategies Modulate flows in a system Reduction in peak flows Creation of flushing waves or scouring waves Reduction in peak sewage detention time. Strategies can be changed as a development grows Power outage management

14 Model RTC to Pump Controller InfoWorks ICM RTC Logic Pump Controller Logic

15 Uncontrolled Design (conventional) Conventional design undertaken without any pump control strategy. Pumps free to operate based on inflows and level in each tank. Image: Aquatec Fluid Systems

16 Uncontrolled Design (conventional) Peak flow at outlet 7 L/s Pipes sized to achieve self cleansing velocities in accordance with WSAA guidelines.

17 Control Strategy Pump operations regulated on a time basis with high level over ride. Pump operations sequenced to spread peak flows across the day. Pipe network redesigned to take advantage of regulated flows.

18 Outlet Flow Comparison Without Control Strategy 7 l/s With Control Strategy 2 l/s

19 Pipe Size Comparison Without Control With Control

20 Sewage Age Profile Comparison Average age reduced from 4.2 hrs to 2.85 hrs - 30% reduction. Peak sewage age reduced from 8.7 hrs to 5.8 hrs 33% reduction. Reduced sewage age = reduced odours and odour control costs.

21 Early Development Control Strategy System Velocities Without Control With Control

22 ~4,500 Properties ~4,500 Pumps ~126 km pipe ~2.5 ML/d Yarra Ranges Pump Groups

23 Yarra Ranges Pump Groups

24 Extreme RTC Challenges Can t open RTC editor when there are that many assets Controlled +100,000 variable control assets in the model +300,000 lines of RTC code is not a problem 3 hours to load into the simulation engine prior to initialisation Some RTC code errors not found when validating RTC and only found during initialisation For example: Q Flow vs Q flow Simulations can take 1 hour to initialise depending on the number of assets being controlled.

25 RTC Summary RTCs allow for precise control of ancillary structures Through the use of in-house RTC generator tools, complex operational procedures can be developed quickly and for a large number of ancillaries Provides the ability to develop, test and validate a range of operational scenarios and design cases.

26 Any Questions Bradley Nissley Urban Water Solutions