Information technologies in modeling operation modes of mining dewatering plant based on economic and mathematical analysis

Abstract

InforMAtIon technoloGIes In MoDelInG operAtIon MoDes of MInInG DewAterInG plAnt BAseD on econoMIc AnD MAtheMAtIcAl AnAlysIs purpose. To ensure the energy efficiency of coal mine power systems. This can be achieved by using rational modes of a sump plant under multifactor initial conditions. Methodology. The research technique is based on the theory of economic and mathematical analysis and the general theory of electrical engineering. findings. For the first time we suggested using the criterion for maximizing the mathematical expectation of the integral (total) profit (savings) P Σ (Y). The foregoing allows us to select an economically feasible diameter for the discharge pipelines of mine drainage plants. The value of the economically feasible diameter (when using this criterion) is greater than when using the crite rion of minimizing the production function P (Y). Therefore, it is possible to achieve maximum economic efficiency. Using reserve pipelines allows the value of the production function P (Y) to be decreased and the value of the integral (total) profit P Σ (Y) to be increased. For the first time, it has been noted that when using various criteria to determine the economically advantageous diam eters of the main pipelines of a mine drainage plant, the value of the economically advantageous diameter does not depend on the number of reserve pipelines used. originality. The research presents the theoretical substantiation of the feasibility of using economic and mathematical analysis in the search for optimal operating modes of drainage plants. We established the dependencies between the parameters of the drainage unit and the indicators of economic efficiency. This allows us to optimize the electromechanical system for energy con sumption. We proposed a method for selecting the number and diameter of pressure pipelines of a mine drainage plant, taking into account a set of technological parameters that provide maximum profit. practical value. We selected and justified the search criteria for the optimal mode of the electromechanical mine drainage. We also developed an algorithm and software package for determining the rational diameter and number of pipelines. Mathematical dependencies make it possible to optimize the operation of a drainage plant according to two criteria, which, taking into account 20 % of the electrical consumption by a drainage system in the mine's energy balance, creates additional opportunities for increas ing the energy efficiency of mining enterprises.

Managing the Power Supply Energy Efficiency by Means of Higher Voltage and Interharmonics

“…This is due to the unpredictable unstable operation of wind turbines with the wind force. As a result, the generated power is unstable and may significantly affect the stability and reliability of the power system operation [22]. The stochastic nature of the active power generated by a wind turbine results in frequency fluctuations in the system, changing both its value and the rate of change over time [21].…”

“…The stochastic nature of the active power generated by a wind turbine results in frequency fluctuations in the system, changing both its value and the rate of change over time [21]. Therefore, quality of power energy provided to consumers decreases with visible effects such as: flickers, changes in time, as well as voltage drops [22]. Moreover, the swinging of the turbine with the wind force leads to low-frequency oscillations of the power, which additionally ruins the stability and operation dynamics of the system.…”

“…According to available data, the annual losses in the world's power system, caused by low quality of energy, reaches approx. 500 billion dollars per year [2,22]. The main negative factors here are both the influence of higher harmonics as well as the asymmetry of the network operation and voltage fluctuations.…”