Evaluation of a state observer for frequency estimation in a grid tied photovoltaic inverter
Document typeConference report
Rights accessRestricted access - publisher's policy
Ahstract-A phase locked loop (PLL) is commonly used to measure the electrical frequency deviations in PV grid tied inverters. However, this control is affected by sudden changes of power that usually happens with this type of power generation as the solar irradiance is intermittent. Thus, the aim of this paper is to estimate the frequency at the point of common coupling by using a state observer. The evaluation of the observer is developed in DIgSILENT PowerFactory under variable solar irradiance. The results show that the observer gives a more accurate frequency value than a PLL when quick changes of solar irradiance occur.
CitationCabrera, A., Gomis-Bellmunt, O., Carrasco, J., Barnes, M. Evaluation of a state observer for frequency estimation in a grid tied photovoltaic inverter. A: International Conference on Environment and Electrical Engineering. "Proceedings - 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe, EEEIC/I and CPS Europe 2018". 2018, p. 1-6.