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POLAJŽER, B., SRPAK, D.
Evaluation of Probability-Distribution Models for Wind-Power Forecast Error
KOMUNALNA ENERGETIKA / POWER ENGINERING, 53
This paper discusses different probability-distribution models for wind-power forecast error. Models known from the literature (beta, Weibull, gamma) are discussed along with the models with extended-skew generalized-normal distribution. Furthermore, a versatile model is discussed, which enables analytical calculation of the percentile function; however, it is sensitive to wavelets in the probability distribution. Obtained results show that beta, Weibull and gamma probability distributions do not capture the actual (empirical) one; far more adequate are models with skew generalized-normal probability distribution.
SRPAK, D., PAJAN, D.
THE IMPACT OF MODULE SHADING AND AZIMUTH ON SOLAR POWER PLANT ELECTRICITY PRODUCTION
KOMUNALNA ENERGETIKA / POWER ENGINERING, 30
This article shortly describes the solar power plant built on the roof of Crnec municipality building and shows the difference between actual and designed production of electricity. As example, the selected solar power plant shows the impact of module shading on electricity production and the possibility of their reduction. Moreover, the difference in production is analyzed depending on the position of the module towards the Sun in different seasons.
SRPAK, D., ŠUMIGA, I., STIJAČIĆ, S.
SOLAR POWER PLANT „STUDENTSKI RESTORAN VARAŽDIN”
KOMUNALNA ENERGETIKA / POWER ENGINERING, 7
This article describes the main elements of solar power plant built on the roof of the student restaurant in Varaždin, particular the used grid inverters. Moreover, the way of connecting the photovoltaic cells on grid converters and user’s installation is presented. At the end of this paper there is a review of electrical energy production during first five month of operation.
SRPAK, D.
CONNECTING WIND POWER PLANTS IN ELECTRIC POWER SYSTEM
KOMUNALNA ENERGETIKA / POWER ENGINERING, 20
This article describes the way of connections and control of nowadays wind power plants connected to fixed power network, and presents problems that are caused by wind plants because their operative instability. It is also described topology of a newer with better regulations capabilities then today commercial used grid converters. At the end of this paper there is a review of existing wind power plants in Croatia and those in construction with guidelines for improvement of system stability with high wind energy penetration.
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