136 research outputs found
The development of the theory of instantaneous power of three-phase network in terms of network centrism
Purpose. Information technologies allow multidimensional analysis of information about the state of the power system in a single information space in terms of providing network-centric approach to control and use of unmanned aerial vehicles as tools for condition monitoring of three-phase network. Methodology. The idea of energy processes in three independent (rather than four dependent) curves vector-functions with values in the arithmetic three-dimensional space adequately for both 4-wire and 3βwire circuits. The presence of zero sequence current structural (and mathematically) features a 4-wire scheme of energy from a 3-wire circuit. The zero sequence voltage caused by the displacement of the zero voltage phases. Offset zero in the calculations can be taken into account by appropriate selection of the reference voltages. Both of these energetic phenomena with common methodical positions are described in the framework of the general mathematical model, in which a significant role is played by the ort zero sequence. Results. Vector approach with a unified voice allows us to obtain and analyze new energy characteristics for 4βwire and 3βwire circuits in sinusoidal and non-sinusoidal mode, both in temporal and frequency domain. Originality. Symmetric sinusoidal mode is balanced, even with non-zero reactive power. The converse is not true. The mode can be balanced and unbalanced load. The mode can be balanced and unbalanced voltage. Practical value. Assessing balance in network mode and the impact of instantaneous power on the magnitude of the losses, will allow to avoid the appearance of zero sequence and, thus, to improve the quality of electricity.ΠΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΠ΅ ΡΠ΅ΡΠ΅ΡΠ΅Π½ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄Π° ΠΊ ΡΠ΅ΠΆΠΈΠΌΡ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΡΡΠ΅Ρ
ΡΠ°Π·Π½ΠΎΠΉ ΡΠ΅ΡΡΡ ΠΈ ΠΎΡΠ΅Π½ΠΊΠ° ΡΠ±Π°Π»Π°Π½ΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΡΡΠΈ ΡΠ΅ΠΆΠΈΠΌΠ° ΡΠ΅ΡΠΈ Ρ ΡΡΠ΅ΡΠΎΠΌ Π²Π»ΠΈΡΠ½ΠΈΡ ΠΌΠ³Π½ΠΎΠ²Π΅Π½Π½ΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ Π½Π° Π²Π΅Π»ΠΈΡΠΈΠ½Ρ ΠΏΠΎΡΠ΅ΡΡ Π΄Π°ΡΡ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΠΈΡΠΊΠ»ΡΡΠΈΡΡ ΠΏΠΎΡΠ²Π»Π΅Π½ΠΈΠ΅ Π½ΡΠ»Π΅Π²ΠΎΠΉ ΠΏΠΎΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΈ, ΡΠ΅ΠΌ ΡΠ°ΠΌΡΠΌ, ΠΏΠΎΠ²ΡΡΠΈΡΡ ΠΊΠ°ΡΠ΅ΡΡΠ²ΠΎ ΡΠ»Π΅ΠΊΡΡΠΎΡΠ½Π΅ΡΠ³ΠΈΠΈ
Network-centric technologies for control of three-phase network operation modes
Purpose. The development of the control system for three-phase network is based on intelligent technologies of network-centric control of heterogeneous objects. The introduction of unmanned aerial vehicles for monitoring of three-phase network increases the efficiency of management. Methodology. The case of decomposition of the instantaneous capacities of the fixed and variable components for 3-wire system. The features of power balance for the different modes of its functioning. It should be noted that symmetric sinusoidal mode is balanced and good, but really unbalanced, if the standard reactive power is not zero. To solve the problem of compensation is sufficient knowledge of the total value of the inactive components of full power (value of the inactive power) without detail. The creation of a methodology of measurement and assessment will require knowledge of the magnitudes of each inactive component separately, which leads to the development of a unified approach to the measurement and compensation of inactive components of full power and the development of a generalized theory of power. Results. Procedure for the compensation of the current of zero sequence excludes from circuit the source, as the active component of instantaneous power of zero sequence, and a vector due to a current of zero sequence. This procedure is performed without time delay as it does not require integration. Only a 3βwire system with symmetrical voltage eliminates pulsations and symmetrization of the equivalent conductances of the phases of the task. Under asymmetric voltage, the power is different, its analysis requires the creation of a vector mathematical model of the energy processes of asymmetrical modes of 3βphase systems. Originality. The proposed method extends the basis of the vector method for any zero sequence voltages and shows that the various theories of instantaneous power three wired scheme due to the choice of a basis in a two-dimensional subspace. Practical value. The algorithm and software implementation for the decomposition of the zero sequence current, which allocated the procedure of obtaining null-balanced vectors of phase and interfacial voltage, calculation of active and inactive instantaneous power is zero balanced mode. The simulation results obtained in the software package Matlab by the method of visual programming in Simulink.ΠΠ½ΡΠ΅Π³ΡΠ°ΡΠΈΡ ΠΈΠ½ΡΠ΅Π»Π»Π΅ΠΊΡΡΠ°Π»ΡΠ½ΡΡ
ΠΈ ΡΠ΅ΡΠ΅ΡΠ΅Π½ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΉ Π² ΠΏΡΠΎΡΠ΅ΡΡ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΡΠ΅ΠΆΠΈΠΌΠ°ΠΌΠΈ ΡΠ°Π±ΠΎΡΡ ΡΡΠ΅Ρ
ΡΠ°Π·Π½ΠΎΠΉ ΡΠ΅ΡΠΈ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΠ²Π°ΡΡ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠ²Π½ΠΎΡΡΡ ΠΊΠΎΠΌΠΏΠ΅Π½ΡΠ°ΡΠΈΠΈ Π½Π΅Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΡΡΠ΅ΠΉ Π² ΡΠΈΡΡΠ΅ΠΌΠ΅ Π·Π° ΡΡΠ΅Ρ ΠΎΡΡΠΎΠ³ΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ°Π·Π»ΠΎΠΆΠ΅Π½ΠΈΡ ΡΠΎΠΊΠ° ΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ΅ΡΠΎΠ΄Π° Π±Π°Π·ΠΈΡΠ½ΡΡ
ΡΡΠ½ΠΊΡΠΈΠΉ Π΄Π»Ρ ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ ΠΏΠΎΡΠ΅ΡΡ
Assessment of the antifungal activity of the violacein-forming strain Janthinobacterium sp. B-3515 against the mould fungus Alternaria brassicicola F-1864
A study of antifungal properties of violacein-forming strain Janthinobacterium sp. B-3515 as well as its secondary metabolite, violacein, against Alternaria brassicicola F-1864 is presented. Regardless of the presence of bacteria, mycelium growth in the first two days proceeded at the same rate. The effect of the bacterial strain was manifested after the third day of incubation. In general, during co-culture, the bacterial strain statistically significantly reduced the average growth of the mycelium of the mould fungus by 10
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