Abstract
The integrated Smart Grid System of harmonization of production and consumption of electric power and heat with the use of heat-pumping power supply of the biogas plant, which uses fermented wort as a low-potential source of power, was developed. A change in the power factor of the cogeneration system, the temperature of local water is predicted by measuring the voltage at the inlet to the inverter, at the outlet from the inverter and voltage frequency. In the engine cooling circuit, the temperature of cooling water at the inlet to the heat exchanger, at the outlet from the heat exchanger, and the return water temperature are measured. It was proposed to estimate a change in the ratio of voltage at the inlet to the inverter and at the outlet from the inverter. Making forestalling decisions to change the power of the heat pump and the number of plates in the heat exchanger of the engine cooling circuit makes it possible to maintain the voltage at the entrance to the inverter and the temperature of the heated local water. The complex mathematical and logical modeling of the cogeneration system, based on the mathematical substantiation of the architecture of the cogeneration system and mathematical substantiation of the maintenance of functioning of the cogeneration system, was performed. Time constants and coefficients of the mathematical models of dynamics regarding the estimation of a change in the power factor of the cogeneration system, temperature of local water, were determined. Functional estimation of a change in power factor of the cogeneration system in the range of 85–95 %, temperature of local water in the range of 30–55 °С at the compensation of reactive power of up to 40 % was obtained. Determining final functional information provides an opportunity to make forestalling decisions on a change in the power of a heat pump and a change in the number of plates in the heat exchanger of the engine cooling circuit to maintain the functioning of the cogeneration system
Highlights
Given the need to save natural fuel and reduce the harmful emissions into the atmosphere, the distributed generation of electric power using renewable sources requires Smart Grid technologies for the integrated control of the flows of electric power and consumption [1, 2]
A relevant task in the context of further development of distributed electricity generation is to maintain the balance of production and consumption of active and reactive powers of the cogeneration system based on the heat-pumping power supply of the biogas plant, a low potential source of power for which is fermented wort [3, 4]
The following tasks were set: – to propose the prediction of a change in power factor of the cogeneration system, the temperature of local water in the engine cooling circuit based on the estimation of a change in the ratio of voltage measured at the inlet to the inverter, at the outlet from the inverter at the measurement of voltage frequency
Summary
Given the need to save natural fuel and reduce the harmful emissions into the atmosphere, the distributed generation of electric power using renewable sources requires Smart Grid technologies for the integrated control of the flows of electric power and consumption [1, 2]. A relevant task in the context of further development of distributed electricity generation is to maintain the balance of production and consumption of active and reactive powers of the cogeneration system based on the heat-pumping power supply of the biogas plant, a low potential source of power for which is fermented wort [3, 4]. The energy-saving technology of maintenance of the biogas plant operation [3] makes it possible to predict a change in fermentation temperature and establish the temperature of warming a heat carrier at the inlet to the heat exchanger, built-in the methane tank, with the use of heat pumping power supply.
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