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Technical Dialogue

Photovoltaic (PV) Inverters and Micro Inverters

D21.5 - Condition Monitoring for DC-Link Capacitors and PV Arrays based on the Start-Up Process of the PV System

Thursday, March 20, 2025
11:30 AM – 1:30 PM ET
Location: Level One, Hall A3
This digest proposes a method to enable condition monitoring of DC-link capacitors and PV arrays simultaneously based on the start-up process in the PV system. First, start-up and DC-link capacitor pre-charge process of the PV system based on PV arrays is described. Then, capacitance is estimated based on charging process, which is independent of additional hardware, complex algorithms and not affected by operation conditions, capacitor temperature and load variations during operation. Moreover, capacitor charging curves also include information of the output characteristics from PV arrays. Thus, a digital twin model of PV arrays is built to extract series (Rs) and parallel (Rsh) resistances as health indicators for evaluating the operation state of PV arrays. Proof-of-concept experiments verify the feasibility of the proposed method.