摘要：AbstractFor analysis of photovoltaic cells artificial light sources, so called solar simulators can be used. The light spectrum and light intensity of the considered LED solar simulators is time varying due to current induced heating of the semiconductor. The change influences the measurement accuracy for the characterisation of solar cells. With the current as a control variable, the light intensity can be stabilised. The drift in the light colour can only be compensated with spectrally adjacent LEDs. Based on known physical and phenomenological correlations concerning the behaviour of LEDs, model equations for the solar simulator were developed and simplified. The corresponding parameters were determined by experiments on a solar simulator. A LQG controller was designed for the stabilisation of the time-varying spectrum. The controller is tested in simulations for different light spectra. The improvements over the uncontrolled case are demonstrated.
