Summary of "A Wi-Sun Network-Based Electric Vehicle Charging Station Using Open Charge Point Protocol (OCPP)"

Key Technological Concepts and Protocols:

Wi-SUN (Wireless Smart Utility Network):
- A mesh network communication protocol operating in the sub-GHz ISM band (865-868 MHz in India) based on IEEE 802.11 standards.
- Enables devices (such as EV chargers) to connect to the internet via a mesh of nodes, ensuring robust and wide-area connectivity without relying on Wi-Fi or LTE.
- Deployed extensively across the Tri Hyderabad campus with about 60 nodes integrated into street lights, providing continuous cloud connectivity for devices.
Open Charge Point Protocol (OCPP):
- An open international protocol used for communication between EV charging stations and central management systems.
- Handles authentication, transaction management, and charging control messages between the EV charger and backend servers.
OneM2M Platform:
- A middleware layer recognized as the de facto standard by India’s Smart City Mission for smart city infrastructure.
- Acts as a data lake and structured database for managing and querying data from various city sensors and devices, including EV chargers.
- Supports user authentication, wallet management (for payments), and transaction logging in a structured tree format separating users and chargers.

Product Features and System Architecture:

The EV charging station integrates all three protocols:
- Wi-SUN for communication,
- OCPP for charge point messaging and authentication,
- OneM2M for middleware services like user management and data storage.
Hardware includes a Raspberry Pi microcontroller for computation and control, a Silicon Labs Wi-SUN module for communication, a power meter for consumption tracking, a relay for switching, and a user interface display.
The system operates like an ATM: users authenticate via RFID, check wallet balance, input the desired charging amount, and the system manages charging sessions accordingly.
Safety features include an emergency stop switch and power line tapping for powering the electronics.
The solution currently supports 16 Amp chargers primarily for electric bikes.

Innovations and Advantages:

The combination of Wi-SUN, OCPP, and OneM2M provides an interoperable and scalable EV charging solution suitable for smart city deployments.
The mesh network ensures connectivity without dependency on cellular or Wi-Fi infrastructure.
OneM2M’s structured data model allows seamless user and charger management, enabling users to charge at any station in the network, akin to using any ATM with a single card.
The entire software stack and middleware have been developed in-house and made open source by the Tri Hyderabad team.

Deployment and Use Case:

The system is deployed at the Tri Hyderabad campus as part of a smart campus initiative with extensive sensor and IoT deployments.
The EV charger prototype is demonstrated with an electric bike.

Main Speaker:

Afab Husin, Faculty Member at Tri Hyderabad, presenting the research and development of this Wi-SUN network-based EV charging station using OCPP and OneM2M middleware.

Summary of content: The video is a technical presentation and tutorial on an innovative EV charging station solution integrating Wi-SUN mesh networking, OCPP for charging protocol, and OneM2M middleware for smart city data management. It highlights the architecture, protocols, hardware design, user flow, and deployment in a smart campus environment, emphasizing interoperability and scalability for future smart city applications.