SIMATIC WinCC powerrate:
Power Management System

Benefits

• Identification of energy-intensive loads and processes for the purpose of deriving measures for improving power efficiency
• Comparison of consumption profiles for more efficient processes
• Optimizing the company according to energy parameters based on an assessment of consumption and costs.
• Prevents limit overshoot and the resulting additional costsI

SIMATIC WinCC powerrate comprises the following components:

• Modules for energy data acquisition and processing
• Faceplates for displaying and processing the energy data
• Allocation of the energy data to cost centers using Excel macros.
• Modules for load management (calculation of trend, limit monitoring, release/inhibit consumers
• Faceplates for display of results and configuration of load management
• Excel macro for determining the duration line, thus establishing decision base for load management

• Energy data acquisition and processing
  Using off-the-shelf modules, energy data can be collected from any Profibus-enabled devices. The data can be available on the modules in the form of counter pulses, counter values, or power values. From this data, the module calculates the power averages and the work values for a specified period. This data is archived in the WinCC tag logging archive. In addition, a limit forecast is extrapolated for each period.
  A sample function (heat calculation) that can be adapted to the needs of the process at any time by means of open interfaces, has been implemented for the purpose of visualizing customized calculations.
  The data from manually read counters can be entered direct into the system and used for further analysis.
• Presentation of the energy data
  The currently collected energy data is presented as power averages/ work values per time interval. Trend displays enable analysis of archived energy data as well as its representation in tables.
  
  
   
• Further processing of data
  The archived data can be exported directly from WinCC to Excel. Using predefined macros several reports can be obtained:
  • Cost center report
    In this report, the costs are allocated to different cost centers and the costs calculated on the basis of predefined rates. The results are provided as a table or as a bar graph
  • Duration line
    Based on the archived medium power values, powerrate calculates how often a certain medium value has occurred in a predetermined elapse of time. This characteristic shows whether short-term power peaks exis
  The exported energy data can be customized and processed. WinCC can access the data since it is archived in the WinCC archive.
• Load management
  Contractual power limits (for current typical usage is the 15 minutes power average) must be adhered to, otherwise drastically increased prices or penalties might be imposed. The load management of SIMATIC WinCC powerrate cyclically executes a trend analysis. If the limit is overshot, it will deliver an alarm or a warning, and will also turn off consumers if configured to do so.
  
  
  In order to prevent unnecessary switching there are a number of parameters that allow you to adapt the load management to the current process. all of this can be done user friendly on the faceplate. Consumers distributed across several PLCs can be incorporated in the load management by specific AS - AS communication modules.
• Additional functions
  To prevent the loss of data in the event of a communication fault, the data are temporarily stored in a circular buffer on the SIMATIC S7. To ensure synchronicity with the power supply company, it is possible to evaluate the synchronization pulse from the power supply company.