1 / 30

New ECE Building: Power Backup System

New ECE Building: Power Backup System. ECE 445 Group #15 Neil Gebhardt Zach Reed Taylor Wu. Presentation Outline. Purpose and Goals Design Overview Hardware Design and Implementation Software Design and Implementation Analysis: Successes and Failures Ethical and Other Considerations

gary
Download Presentation

New ECE Building: Power Backup System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. New ECE Building: Power Backup System ECE 445 Group #15 Neil Gebhardt Zach Reed Taylor Wu

  2. Presentation Outline • Purpose and Goals • Design Overview • Hardware Design and Implementation • Software Design and Implementation • Analysis: Successes and Failures • Ethical and Other Considerations • Future Improvements

  3. Purpose of the Project • To provide effective and efficient backup power to maintain operations during a power outage • To allow more time to properly shutdown any equipment to prevent damage or data loss. • Lower installation and operational costs for a backup generator system

  4. Goals of Project • Immediate backup power to connected systems • Keep the primary systems powered with a battery for as long as possible • Intelligently manage the load so that the maximum amount of devices can remain powered

  5. Hardware (Overview) • Uninterruptable Power Supply • Provides instantaneous power backup to outlets so that sensitive electronics remain on. • Switches and Outlets • Provide a means to disconnect an individual standard 120V 15A outlet from the UPS. • Controller • Allows interfacing of hardware with the software.

  6. Block Diagram

  7. Universal Power Supply • Uninterruptable Power Supply • Voltages were higher than expected on input side • 40V end-end, 20V from bridge, 14.1V from regulator • Voltage to outlets was normal at 120V

  8. Bridge Implementation • Bridge with filter capacitor • Large Capacitor (2200µF) • Output voltage max: 5.59V min: 5.46V P-P: 0.13V

  9. Block Diagram Voltage Regulator

  10. Voltage Regulator Tests • Voltage Regulator • Smooth output max: 14.155V min:14.149 P-P: 0.0065V • Adjustable output with potentiometers

  11. Relay Board • Relay Board to switch outlets • Use BJTs to drive coils with control chip

  12. Relay Board Tests • Dual Coils • Each relay has two independent coils • Allows definitive switching • Switching with 3V puts 50mA across main coil

  13. Sensing • 120V Power Indicator • Senses if the main voltage lines are on. • Backup Generator Current Indicator • Senses if backup generator is on • Battery Level Indicator • Allows reliable estimation of battery levels • Outlet Current Sensors • Allows measurement of power usage for each outlet

  14. Block Diagram

  15. Sensing – 120V Power Indicator • To help determine how the controller should be operating.

  16. Backup Generator Current Indicator • ACT750-42L-F 250A current sensor • Output 0-10VDC depending on current • Was not implemented due to costs ($180) and lack of backup generator.

  17. Battery Level Indicator • Battery used was 12V sealed lead acid from Embassy by Crown (12CE75). • 12.2V Fully charged and 10.5V being the End of Discharge Voltage for the battery.

  18. Outlet Current Sensors • With a static voltage output, current draw determines power usage. • ACS715 Hall Effect Current Sensor, which can measure up to 20A. • Outputs 185mV/A.

  19. Outlet Current Sensors 2A Input Test

  20. Software (Overview) • Inputs • Determines controller Operation • Outputs • Opens or closes switches based on algorithm • Power Optimization • Deterministic algorithm that maximizes power usage.

  21. MSP430 – Pin Diagram 1 – Dvcc – Digital voltage reference (high) 2 – A3 – Outlet 1 current 3 – A4 – Outlet 2 current 4 – A5 – Outlet 3 current 5 – A6 – Outlet 4 current 6 – A7 – Outlet 5 current 12 – P1.0 – Outlet 1 switch 1 13 – P1.1 – Outlet 2 switch 1 14 – P1.2 – Outlet 3 switch 1 15 – P1.3 – Outlet 4 switch 1 16 – P1.4 – Outlet 5 switch 1 20 – P2.0 – Outlet 1 switch 2 21 – P2.1 – Outlet 2 switch 2 22 – P2.2 – Outlet 3 switch 2 23 – P2.3 – Outlet 4 switch 2 24 – P2.4 – Outlet 5 switch 2 59 – A0 – UPS 60 – A1 – Main Voltage 61 – A2 – Generator Current 62 – AVss – Analog reference (0V) 63 – DVss – Digital voltage reference (low) 64 – AVcc - Analog reference (~3V)

  22. Software Algorithm • Overview

  23. Software Algorithm Tx = time outlet x is on. Wx = weighted value of outlet x (delivered from RS232) Px = power being dissipated at outlet x Total Weight = T1*W1+T2*W2+T3*W3+T4*W4+T5*W5 Battery Energy = T1*P1+T2*P2+T3*P3+T4*P4+T5*P5 • Want maximum value of Total Weight (TW) • Six dimensional equation (T1-T5 and TW )

  24. Finding Maximum • Set a time cap • Generator starts after some time • Helps balance time each outlet is on • Start at origin • TW increases with time • Find the max in each direction • Recursive

  25. Finding Maximum • Incrementally head in direction of max • Subtract power of direction from energy • Similar TWs: move in direction we've moved the least (balances times) • Zero weight: never move in that direction • Repeat until out of power • Time cap reached at all non-zeros • Give rest of time to outlet that gives most weight for time left • Balance similar TW

  26. Software Algorithm Tests: Battery Energy = 200 Time cap = 20

  27. Analysis: Successes and Failures • Success: Input side of UPS performs well, relay system is reliable • Failure: UPS inverter was not implemented • Success: Sensing for voltages and currents • Failure: Unable to interface to MSP320 • Success: Algorithm gives desired output signals from MSP430 • Failure: Bigger MSP430 did not work; lack of input analog signals

  28. Ethical and Other Considerations • Actual vs Implied performance • Should not imply that the system can perform better than it does. • Accurate Sensing • Without accurate sensing, controller cannot have proper decision making. • Proper decision making • Able to operate as user intended

  29. Future Improvements • Design sub-systems so that most can be independent of the control system. • Friendly graphics user-interface, especially to make weighting each outlet easier. • Higher grade equipment to supply at actual expected power, standard being 120V 15A.

  30. Thank You For Your Time Questions?

More Related