ds-project

Integrating Souza et al.'s Ecovisor into Mosaik Co-Simulation

Distributed Systems Project Winter Term 2022/2023

To reduce emissions, cloud platforms must increasingly rely on renewable energy sources such as solar and wind power. Nevertheless, the issue of volatility associated with these sources presents a significant challenge, since current energy systems conceal such unreliability in hardware. Souza et al. have devised a solution to this issue by creating an “ecovisor”. This system virtualizes the energy infrastructure and allows for software-defined control to be accessible by applications. Setting up the ecovisor to develop carbon-aware applications, however, can be costly and time consuming. To address this problem, we simulated the ecovisor and its virtual energy system and integrated in into a Mosaik co-simulation. With an API server and a Redis database we are enabling Software- (SIL) and Hardware-In-The-Loop capabilities. To evaluate our approach, we created test cases using recorded solar and carbon data to demonstrate the accuracy of the ecovisor model’s implementation and its ability to transfer data correctly between the model and the API server.

Repository Structure

├── documents: contains all paperwork like presentations, pictures and stuff
├── resources: data for carbon intensity solar generation
└── src
    ├── mwe.py
    ├── agents
    │   ├── consumption_agent.py
    │   └── pv_agent.py
    ├── models
    │   ├── simple_energy_grid_model.py
    │   ├── simple_battery_model.py
    │   └── ecovisor_model.py
    ├── simulators
    │   ├── collector.py
    │   ├── consumption_controller.py
    │   ├── ecovisor.py
    │   └── pv_controller.py
    └── utils
        ├── api_server
        ├── consumer.py
        └── single_model_simulator.py

Further Resources

Mosaik: https://mosaik.offis.de/

Ecovisor: https://arxiv.org/abs/2210.04951

Start Simulation

install dependencies python -m pip -r requirements.txt

install & start docker systemctl start docker

start api server python api_server.py

start simulation python mwe.py

start consumer python api_consumer.py

API usage

The API exposes the following endpoints via http.

The standard url is localhost:8080/api/*

Method	Endpoint	Parameter
GET	/api/solar_power	-
GET	/api/grid_power	-
GET	/api/grid_carbon	-
GET	/api/battery_discharge_rate	-
GET	/api/battery_charge_level	-
GET	/api/container_powercap	container_id:str
GET	/api/container_power	container_id:str
POST	/api/container_powercap	container_id:str, kW:float
POST	/api/battery_charge_level	kW:float
POST	/api/battery_max_discharge	kW:float