Kolloquiumsvortrag: 21. April 2020, Matthias Akstaller

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Developing an OCPP-Subprotocol to implement load management on microcontrollers

The breakthrough of Electric Vehicles and their tremendous charge rates raise the need for the charging power being managed by a central load optimizer. That requires Charging Stations to be sensitive to load signals from a central authority. However, today residential Charge Points mostly lack such functionality. This thesis proposes an extra lightweight subprotocol of OCPP 1.6 to make Smart Charging feasible on as many microcontrollers as possible. The approach is to consider the scope of OCPP as combination of different concerns, which it separates pure Smart Charging from and then varies the degree of OCPP-compatibility, leading to an iterative methodology. To define Smart Charging in the first place, an analysis of related protocols was conducted to find the most common key properties. Finally, the performance indicators of the iterations are compared based on a theoretical analysis as well as on reference implementations on an ESP8266. The analysis of related protocols uncovered a set of stringent key components of Smart Charging over various backgrounds, making the design of the subprotocol promise a high coverage of business cases. Test setups with a real Charging Station and with the load management suite of ampcontrol proved general feasibility. Performance benefits regarding runtime behavior could be shown to some extend and the total size of required program memory was proved to be significantly reduced throughout. As a result, this subprotocol reduces hardware requirements and costs of development for Smart Charging applications, potentially driving the general adoption of Smart Grid technologies.


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