Technical Guidance on Integrating SCADA Data with Edge Services on Raspberry Pi for Smart Grid EMS

[stefan.feilmeier]

Hi nada,

@nada

1. What are the best practices or recommended protocols for establishing communication between the SCADA system and the Raspberry Pi edge service?

In a local network or VPN, i.e. if SCADA system and OpenEMS Edge can “see” each other, you can use out of the box:

• Modbus/TCP via openems/io.openems.edge.controller.api.modbus at develop · OpenEMS/openems · GitHub
• REST/JSON via openems/io.openems.edge.controller.api.rest at develop · OpenEMS/openems · GitHub
• MQTT via openems/io.openems.edge.controller.api.mqtt at develop · OpenEMS/openems · GitHub
• Websocket/JSON via openems/io.openems.edge.controller.api.websocket at develop · OpenEMS/openems · GitHub

I’d recommend REST/JSON in your case, if your SCADA system supports it. Alternatively Modbus/TCP.

@nada

2. Are there specific Python libraries or frameworks that can facilitate this communication effectively?

Read State-of-Charge using REST/JSON: (Source)

import requests

url = 'http://192.168.0.23:80/rest/channel/_sum/EssSoc'

user = 'x'
password = 'user'

session = requests.Session()
session.auth = (user, password)

response = session.get(url)
response.raise_for_status()

print(response.text)

Send charge/discharge command to Energy Storage system via REST/JSON: (Source)

import requests

url = 'http://192.168.0.23:80/rest/channel/ess0/SetActivePowerEquals'

user = 'x'
password = 'owner'

session = requests.Session()
session.auth = (user, password)

data = {"value": 5000}

response = session.post(url, json = data)
response.raise_for_status()

@nada

3. What are the recommended approaches for managing and processing SCADA data on the backend?
4. How can I ensure the data is stored efficiently and is readily available for real-time processing and analytics?
5. What is the best approach to transmit processed data from the backend to the UI for real-time monitoring and control?

For those questions I am unsure about your exact system architecture. Can you take this image as a reference and tell us if this looks like your setup? → Introduction :: Open Energy Management System

Regards,
Stefan