Architecture for Embedded Supervisory System of Distributed Renewable Energy Sources

The purpose of the paper is to present an architecture of an embedded solution for system supervision of distributed renewable power systems. This work is a first step towards an IoT solution, appropriate for small power, but spread renewable energy solutions as in smart residences. The OPC protocol is chosen as the most suitable solution for long distance communication, whereas serial communication is employed for short distances. The OPC server/client platform is microprocessor based, while the generators are controlled through microcontrollers that interact through serial communication with local OPC nodes. The microcontrollers can provide the supervisor with different parameters, such as voltage, current, control value, but can also receive parameters, such as the set point of the generated power, solar irradiation, temperature. The multiplatform capabilities of the python language are considered. A validation is realized via Arduino boards as local controllers for the generators and Raspberry Pi boards as OPC server/clients and a global supervisor is developed in Matlab. The solution is interesting as it gives a strong modularity and easy access to portable solutions on the ground.