Theoretical Comparison of Component-Related Measurement Methods of Photovoltaic Inverters for Long-Term Testing

This paper presents a theoretical evaluation of different methods to measure relevant component parameters of photovoltaic (PV) inverters for the purpose of creating a digital twin. The main objective is to measure relevant data about component degradation during long-term testing without changing or influencing the inverter behavior. The paper provides a brief overview of different measurement opportunities and degradation indicators as well as a suggestion for the planned test bench. Chosen options and their implementation for long-term testing of the un-modified PV inverter out of several are described.