Electric Boiler Use Excess Power Test System Model implementation - title

Electric Boiler Use Excess Power Test System Model Implementation

Electric Boiler Use Excess Power Test System Model implementation - overview

Test System Model Implementation Overview

Author / organization: Benedikt Leitner / AIT

Implemented Component Models / Implementation Tool:

Implementation Approach: Monolithic

Test Parameters of Test System Model : All parameters according to system configuration

Outputs/Measured Parameters:

  • External electric grid:
    • Power flows to and from
  • Base district heating boiler
    • heat generation
  • District heating network
    • Supply temperatures at substations
    • Differential pressures at substations
  • Low voltage distribution network
    • Voltages at consumer connection points
    • Transformer loading

Initial State of Test System Model:

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

Temporal Resolution:

  • District heating and electric boilers:
    • dynamic, variable step size
  • Electric network and model predictive controllers:
    • 15 minutes

Related System Configuration

SmartDorf System Configuration

Related Test Case

Increased RESSelf Consumption

Related Use Case

UC4 –Network‐optimized Use of DER

Electric Boiler Use Excess Power - description

Short Description

This test system model is used to verify that self-consumption of renewable energy sources in a coupled heat and power network improved using distributed power-to-heat appliances compared to a base scenario without power-to-heat. This means that energy flows flowing out of the network are reduced. At the same time energy imports should not increase. Relevant effort variables of both networks, i.e., bus voltages, supply temperatures and differential pressures, must stay within the allowable range. Also, the loading of the transformer is not allowed to reach critical levels. Otherwise the test fails.

Electric boilers are used as power-to-heat appliances. They consist of an electric heater, for the conversation of power to heat, and a thermal energy storage, for the (short-term) storage of generated heat. To plan the operation of the storage unit and the electric heater, a model predictive controller is used. The aim of the controller is to minimize negative residual load of the electric network. To enable this planning, negative residual load in the electric as well as heat demand in the heat network need to be known/predicted. This test assumes perfect knowledge of these time-series data and, thus, does not focus on the quality of predictions.

Electric Boiler Use Excess Power Test System Model implementation - code

Source Code of the Implemented Result Object

Please contact:

Name: Benedikt Leitner / AIT

 Send Email

Electric Boiler Use Excess Power Test System Model implementation - evaluation

Evaluation of System State and Test Signal

Every 15 minutes model predictive controllers receive current heat generation and heat discharge from respective electric boilers together with predicted residual load of electric network and heat demand of district heating network. Thus, electric boilers receive new setpoints for heat generation & heat discharge from model predictive controllers. Every 15 minutes electric network receives current power consumption from electric boilers. Otherwise subsystems are independent from each other.