Analysis of the characteristics of steady-state operating conditions of the power unit circuit with ASTG
Students Name: Shvets Oleksandr Vitaliiovych
Qualification Level: magister
Speciality: Power Stations
Institute: Institute of Power Engineering and Control Systems
Mode of Study: part
Academic Year: 2021-2022 н.р.
Language of Defence: ukrainian
Abstract: The efficient operation of the power system is determined, in particular, by the capabilities and reliability of the power supply systems of the integrated power system to ensure the quality of electricity by frequency and voltage level, and hence energy efficiency. The current state of the power system of Ukraine is characterized by the widespread use of power transmission lines with voltage classes of 330 and 750 kV. The charging power of such overhead lines is quite significant, which generates significant amounts of reactive power in the network, which manifests itself especially in the hours of reducing the load in the power system with significant increases in voltage levels. Excess reactive power affects the modes of operation of the excitation regulators of synchronous generators by narrowing their operating range. Under such conditions, modernization or reconstruction of power plants should take into account the possibility of solving a range of tasks related to the rationalization of electricity and energy consumption, taking into account the relationship of power plant regimes with power consumers, which is associated with excess reactive power depending on the role of the station in the power system, increasing the reliability of the station equipment, increasing the station limit of dynamic stability, reducing the required emergency reserve of the power system, etc. In this case, the problem of using power plants along with traditional synchronous generators and asynchronous turbogenerators (ASTG) becomes relevant, which increases the reliability and quality of the power plant due to greater efficiency of the asynchronous generator with stability and additional margin for reactive power consumption. Widespread introduction of asynchronous turbogenerators in the Ukrainian power system can solve the problem of excess reactive power on power plant tires during hours of load reduction in the power system due to the possibility of deep consumption of surplus asynchronous generators, which will stabilize within acceptable voltage levels. In addition, it should be noted that the widespread introduction of ACT will affect the problem of narrowing the control range of automatic excitation regulators of synchronous generators, which in excess of reactive power are forced to switch to close to reactive power consumption synchronous generator and limited by protections. Study object - characteristics of short-circuit currents ASTG-200 and 1000 MW in the circuit of the power unit. Scope of research - asynchronous turbogenerator with a capacity of 200 and 1000 MW in asynchronized and asynchronous modes. 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