The problems of various factors on the process of launching high-voltage synchronous motors. Possibilities of optimization of start electromechanical systems with synchronous motors. A mathematical model of the electromechanical complex, which implements various starting methods.
Problems of an electrical supply of objects oil extracting remote areas are considered. Application of local systems of an electrical supply with application as the energy carrier of passing oil gas is proved. The analysis of applied local system of an electrical supply is made and recommendations about its perfection are made. Results of imitating mathematical modeling of start of the synchronous generator from the storage battery are presented.
The basic ways of control of power, transferred to a heating element of coal-face electrothermal devices are considered. Research of influence of work of a heating element on quality of the electric power in distributing networks is carried out.
The problems of power supply of the distal oil and gas producing enterprises are considered. Application of local system of electro-power supply with using passing oil gas is based. The analysis of system of electro-power supply in operation is executed and recommendations on its perfection are given by realization of automatic sectioning overhead power line on a basis decentralized algorithm of work of multipurpose automatic slice post.
Perfection of systems of excitation is defined both actualization of known requirements, and occurrence new. We shall note the following: increase of the entrance moment, increase in dynamic stability, decrease in losses, maintenance of requirements on quality of the electric power networks of feed, group management and regulation, a mode of operation with a minimum level of service. Performance of these requirements with a necessary level of efficiency is provided with application of the power keys operated by a voltage (IGBT, IGСТ) and microcontrollers. New electronics allows to maintain the equipment with a minimum level of service, but generates a new problem of replacement of accessories at long operation. For example, alternation of generations of microcontrollers demands drawing up and debugging of the new program.
The necessity of forming the specified starting characteristics of stationary plants of mining enterprises with synchronous drive of medium and high power is shown. The synchronous motor with excitation system with two-way converter is considered. This excitation system meets the technical requirements for the considered types of drives. When starting and self-starting the motor, the bilateral converter is used as an inverter, and during synchronous operation as a controlled rectifier. At the same time, its operating mode depends on the voltage level in the supplying network and the value of the current induced in the field winding of the motor. It seems necessary to consider the issues of stable operation of the two-way converter in the inverter mode and to investigate the motor starting characteristics with this system in order to obtain the corresponding analytical dependences and calculation methods. Idealized dependences of the maximum value of the inverted current on the control and commutation angles and the parameters of the power transformer were obtained. When analyzing these dependences, it is determined that in real conditions, the maximum value of the control angle at the same parameters of the power transformer and the value of current i f is less than in the idealized ones.