Doctoral Thesis for obtained the Doctor of Technical Sciences degree in specialіty 05.14.08 – Transformation of renewable energy. Vinnytsia National Technical University, Institute of Renewable Energy of the National Academy of Sciences of Ukraine, Kyiv, 2021.
The Doctoral thesis is focused to the decision of tasks of development and perfection of models and methods of renewable energy sources (RES) efficiency increase, in particular, scientific and technical means of increase of energy efficiency of photovoltaic modules due to definition of their residual resource by means of neuro-fuzzy modeling, and also, normative-regulatory bases of, and assessments of their sensitivity to the reservation of power and electricity for balancing, namely the compensation of uneven generation schedules by wind (WPPs) and photovoltaic plants (PVPs), by the method of criterion programming.
Therefore, the peculiarities of RES operation in Ukraine and in the world and their impact on the power system in modern conditions, as well as the main negative features of electrical networks that reduce the efficiency of RES, in particular the problem of balancing in power systems caused by insufficient maneuverability in power system of Ukraine. Also, the ways of taking into account the type of power sources, voltage level, consumption schedule, non-uniformity of generation schedule are substantiated, which will allow achieving maximum results in adjusting the energy strategy and development of RES in a particular region. It is shown that the normal state of electrical networks of the power system is an important condition for the implementation of efficient use of RES.
A method for determining the set of influential meteorological factors on the amount of RES electricity generation with an uneven generation schedule depending on their location was developed, which allowed forming a sample of the most informative meteorological factors for forecasting their hourly schedule of generation on the next day.
A method for assessing the technical condition of the photovoltaic module using neuro-fuzzy modeling and expert evaluation of specialists is proposed, which, unlike existing methods, creates conditions for more accurate determination of the actual generation of PVPs with their participation in balancing power systems and, as a result, reducing penalties. sanctions and increasing economic efficiency.
A method for optimizing the cost of increasing the energy efficiency of RES in the electricity balance of the power system by the method of criterion programming, which allows determining the proportionality of costs of different methods of power back up to compensate for uneven schedules of RES generation and a method of analyzing the economic sustainability of energy efficiency costs. Methods of power reservations by analyzing their sensitivity by the criterion method, which allows determining the impact of each of the methods of reservation on the costs.
A method of combined use of different types of renewable energy sources in energy supply systems is proposed, which consists in optimizing hydrogen and electricity supply for an integrated hydrogen-electric energy system taking into account energy distribution between different aggregators by the criterion of cost minimum value of hydrogen and electricity.
A method for detecting faults of photovoltaic modules online has been developed, which in the development of the existing monitoring method is based on information collected by SCADA systems of photovoltaic installations and experience of operating personnel, taking into account the sensitivity of PVPs generation by criterion method and increase the efficiency of PVPs as a whole.
The fault tree of the photovoltaic module was developed, which allowed identifying main events that require special attention and operating conditions that lead to the intensive development of these defects.
The method of criterion programming has been improved for problems with the model of costs for compensation of non-uniformity of RES generation schedule with a degree of complexity greater than one, which allows to express some redundancy costs through others and compare their efficiency in relative units.
Keywords: energy efficiency, renewable energy sources, non-uniformity of generation schedule, electricity balance, chemical storage, hydrogen installations, photovoltaic stations, wind power plants, photovoltaic module, technical condition.
