The object of research is energy processes in a hybrid photovoltaic system with a storage battery for the needs of a local object involving the setting of power consumed from the network. The task addressed was to build a mathematical model of energy processes with the function of determining control parameters providing for the possibility of changing control scenarios. The mathematical model of the storage battery has been improved, taking into account the charge modes and discharge currents in terms of accuracy of reproduction of the manufacturer’s specification not worse than 3 %. A structure of the model was proposed with separation of module, which defines control parameters, as well as the schedule of power setting for selected scenarios. A variable is introduced into the model description, which determines the specified power value and ensures the construction of SoС(t) schedule. An additional mode to increase the energy use of the photovoltaic battery and restrictions on the measured value of load power were taken into account. Modeling with a change in time scale was proposed: first, control parameters are determined, followed by modeling in the daily cycle. This eliminates the need for preliminary calculations before modeling and provides the ability to verify the determination of system parameters with subsequent adjustment. A procedure for determining control parameters with power setting and adjusting the model under different control scenarios has been devised. When using archival generation data for the location of the facility, this makes it possible at the design stage to choose an option for implementing the power supply system with the desired indicators. For specific uses, it has been shown that underestimating the power of a photovoltaic battery by only 9 % increases energy costs by 1.72–1.39 times. Overstating power by 16.7 % impairs usage by 13.7 % while reducing costs by 1.4 % to 2.5 %
This article researches the theoretical approaches to the place and role of risk management in the field of state governance of the economy. The concepts of "risk" and "risk management" pertaining to the activity of state authorities have been defined. The problems that arise in the field of public finance management are identified, as well as the problems relating to the experience of applying the Methodology for assessing fiscal risks associated with the activities of state-owned enterprises. The possibility of introducing international risk management standards and best practices of risk management in public administration, which are used by the EU member states, into Ukraine has been identified. This article presents the results of an expert survey on the problems and ways of introducing risk management into the activities of the Ministry of Finance of Ukraine. The survey showed that the field of public finance in Ukraine needs to implement modern approaches to risk management.
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