abstract
Short measurement time of tens of ms at industrial production leads to high influence of parasitic current on the current voltage (IV) curve characterization. This parasitic current deteriorates the measurement accuracy and should be mitigated. However, most methods, like, e.g., sectional measurement or DragonBackTM, are based on either unpractical long measurement time or sophisticated simulations. We present an algorithm for the generation of voltage sweep for low hysteresis measurement of IV characteristics in high capacitive solar modules. Using one linear voltage sweep-based IV characteristics as input, an optimized nonlinear voltage sweep is generated with our algorithm. While the linear voltage ramp during a 93 ms pulse leads to a hysteresis error at maximum power (ϵPmpp) of 1.46% for a 1-cell heterojunction minimodule and 2.35% for a 120-cells heterojunction solar module, the ϵPmpp with the optimized nonlinear voltage ramp is reduced to 0.38% and 0.48%, respectively. The hysteresis error of short-circuit current (ϵIsc) and hysteresis error of open-circuit voltage (ϵVoc) remain below 0.5% by optimized nonlinear voltage ramp. Thus, all three hysteresis error parameters ϵPmpp, ϵIsc, and ϵVoc fulfill the standard IEC 60904-1 (edition-3).Beteiligte Forschungsgruppen
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