The work is devoted to the development of a control system for a wind generator with the use of a switched reluctance motor. The search for new structures for the construction of the power unit and control system of electromechanical systems of wind power complexes is an urgent task of today. The most common construction options for such systems include double-fed induction motors and permanent magnet synchronous generators. In the first case there is no possibility of full control of the flow of power transmitted to the network, and in the second case the main disadvantage is the high cost of such an electric machine, which is explained by the use of rare earth materials in its design. The use of a switched reluctance motor as a generator has significant differences compared to similar use of electric machines based on torque generation due to the Lorentz force. A mathematical model of the electromechanical system of a wind generator with a switched reluctance motor in the Matlab / Simulink environment was developed. It was shown by mathematical modeling that when changing the sign of load torque, the machine does not go into braking mode independently, as is the case with other electric machines. This creates considerable difficulties in the operation of such a system, since the transition to brake mode requires a change in control effects on the switched reluctance motor. Features of functioning of the switched reluctance motor in the mode of regenerative braking have been stated. The limits of change of control angles which allow to receive the maximum amount of the generated electric energy and reduction of pulsations of brake torque of the machine have been defined. The structure of the control system of a switched reluctance motor has been developed, which involves the use of a modified speed controller, which divides its output signal into a sign function, which is subsequently used to select the converter control angles, as well as the absolute value used in the operation of the modulation algorithm of the required current magnitude.
The urgency of developing the system of automated control of energy flows in conditions of underground mining of iron ore has been shown. The principles of implementing of mentioned approaches based on the use of fuzzy logic have been proposed using previously defined criteria and algorithms of fuzzy control. The simulating of operation of fuzzy controllers in the environment of the MatLab software package has been carried out using two-part and three-part electricity tariffs. The efficiency of fuzzy controlling systems in conditions of single-channel and multi-channel controlling has been proved. The results of the application of various automated fuzzy control strategies in conditions of mining enterprises with underground mining of iron ore using two-rate and three-rate electricity tariffs have been analyzed. Corresponding recommendations for the optimizing of industrial energy consumption have been proposed. References 12, figures 8, tables 4.
Purpose. Analyzing of the principles of construction of a doublerotor induction machine control system as a power divider in hybrid vehicles. Defining the features of the functioning of this electromechanical system during the operation of the internal combustion engine and when it is turned off. methodology. The theoretical studies were based on the theory of induction electric machines, the principles of the operation of power converter devices, the laws of transformation of electric energy into mechanical and vice versa. The synthesis of the control system of the doublerotor induction machine was carried out using the theory of field oriented vector control. The design of the computer model was performed using simulation in the Matlab/Simulink environment. findings. The existing structures of hybrid vehicles were analyzed and it was found that the most versatile scheme is a seriesparallel scheme. In such systems, the planetary transmission is used as a power divider, but it is a complex mechanical unit. In order to replace the planetary transmission in the hybrid vehicles, the possibility of using a dou blerotor induction machine was studied. The structure of the control system for an induction machine with two ro tors is developed, the internal rotor of which is connected to the internal combustion engine, and the external rotor is connected to the transmission of the vehicle. The stator and the internal rotor of the machine are connected to a converter that can conduct electric energy in both directions. The results of the simulation of the system during op eration of the internal combustion engine, as well as when it is turned off, are presented. originality. The structure of the control system of a doublerotor induction machine in the hybrid vehicle, in which the control of the internal rotor is carried out in order to maintain the reference value of the torque, and the control of the external rotor is carried out in order to maintain the necessary speed of the vehicle, is proposed. Practical value. The proposed system can be used in the structure of existing hybrid vehicles built on a series parallel scheme. In its structure, a doublerotor induction machine can simultaneously replace both electric ma chines, one of which is most often used in the generator mode, and the other is used in the motor mode, as well as the planetary transmission, which performs the separation of electrical and mechanical powers.
The work is devoted to the development of a control system for a wind generator with the use of a switched reluctance motor. The search for new structures for the construction of the power unit and control system of electromechanical systems of wind power complexes is an urgent task of today. The most common construction options for such systems include double-fed induction motors and permanent magnet synchronous generators. In the first case there is no possibility of full control of the flow of power transmitted to the network, and in the second case the main disadvantage is the high cost of such an electric machine, which is explained by the use of rare earth materials in its design. The use of a switched reluctance motor as a generator has significant differences compared to similar use of electric machines based on torque generation due to the Lorentz force. A mathematical model of the electromechanical system of a wind generator with a switched reluctance motor in the Matlab / Simulink environment was developed. It was shown by mathematical modeling that when changing the sign of load torque, the machine does not go into braking mode independently, as is the case with other electric machines. This creates considerable difficulties in the operation of such a system, since the transition to brake mode requires a change in control effects on the switched reluctance motor. Features of functioning of the switched reluctance motor in the mode of regenerative braking have been stated. The limits of change of control angles which allow to receive the maximum amount of the generated electric energy and reduction of pulsations of brake torque of the machine have been defined. The structure of the control system of a switched reluctance motor has been developed, which involves the use of a modified speed controller, which divides its output signal into a sign function, which is subsequently used to select the converter control angles, as well as the absolute value used in the operation of the modulation algorithm of the required current magnitude .
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