Simulation Results of Electric Boiler Use Excess Power

Results of Simulation of Electric Boiler Use Excess Power - title

Simulation Results of Electric Boiler Use Excess Power

Simulation of Electric Boiler Use Excess Power - setup

Simulation Setup & Configurations

Author / organization: Benedikt Leitner / AIT

Objective Function of Simulation:
Operation costs for a thermal-electric unit combined with a thermal-storag
 
Simulation Duration: 1 day with control steps calculated for every 15 minutes
 

Key Performacne Indicator:

  • KPI1 - Peb-Pref2: Quadratic difference of power consumption to set-point
  • KPI2 – Qdis*cDH  : Revenue from discharged heat to district heating network
  • KPI3 – : Minimize constraint violation via slack variables

Initial Simulation State:

  • District heating pipes have nominal temperatures
  • Thermal storages are empty, i.e., have nominal return temperature of district heating network
  • Electric boilers not running

Stopping Criteria of Simulation:

  • Freezing/boiling water in any part of district heating network
  • Invalid power flow calculation
  • Model predictive controller unable to predict next step (infeasible model)

Start Point:

  • In principal the initial average tank temperature is estimated based on temperature measurements from physical model
  • The initial temperature is assumed to be at the minimum in the results for the open-loop MPC that are shown here

Results of Simulation of Electric Boiler Use Excess Power - description

Short Description of Simulation Results

  • The weights ai in the objective function where tuned such that the reference signal for the electric boiler power is tracked nearly perfectly while discharging heat preferably at times where the revenues for district heat supply are high.
  • A violation of the soft constraints is severly penalized and does not occur under normal conditions, i.e., initial temperature within bounds.

Simulation of Electric Boiler Use Excess Power - data

Simulation Input

Test Data

  • Link to test data: Here
  • Storage of Data: SmILES data format

Test System Model used for Simulation:

Results of Simulation of Electric Boiler Use Excess Power - best practice

Simulation Results of Electric Boiler Use Excess Power - related documents

Nested Applications

Results of Simulation of Electric Boiler Use Excess Power - long description

Results Description of Simulation -- Electric Boiler Use Excess Power

As the MPC is considered to run every 15 minutes for a whole year, only two representative days are shown here. For this example the MPC is triggered at midnight and the set-points for the next 96 time steps, i.e., 24 hours are shown. Note that only the current/first control step is sent to the physical model and at the next control step the MPC is re-run again. The coupled simulation of physical and control model is conducted for a full year to account for seasonal changes in heat demand and photovoltaic generation. The results presented here are only open-loop results for one day without any interaction with the physical model.