Регулювання напруги в електроенергетичній системі асинхронізованими турбогенераторами електричних станцій та оптимізація вибору їх кількості

Abstract

The study examines the ion of the number of asynchronized turbo generators (ASTGs) required for installation at power plants during construction or reconstruction to compensate for excess reactive power exceeding the regulatory capabilities of synchronous turbo generators (STGs) to ensure the specified voltage levels. Compared with STGs, ASTGs have significantly superior regulatory capabilities under reactive power consumption modes. They are capable of maintaining specified voltage levels at the power system (PS) buses under minimum load conditions of the electric power system (EPS). At the same time, ASTGs are more complex in design than STGs and, consequently, more expensive. Therefore, it is not advisable to install only ASTGs in power systems. Their quantity must ensure the consumption of excess reactive power in the network and maintain the specified voltage levels at the distribution devices (DD) of the thermal power plants (TPP) in all operating modes. The input data for the calculations are the power profiles of the PS during the winter peak and summer minimum load periods as well as the manufacturer's diagrams of permissible operating conditions for various generator types. The developed methodology provides a detailed description of the procedure for determining the minimum number of ASTGs required for installation in power systems experiencing operating conditions with excess reactive power. The magnitude of the expected maximum of uncompensated excess of the reactive power at the PS buses and the regulatory capabilities of STG and ASTG in reactive power consumption modes are the key factors. An example of the calculation of the optimal number of ASTGs of the ASTG-200 type for installation in a power system with a rated capacity of 1400 MW and power units with a nominal capacity of 200 MW is provided. Based on the calculation results, it is advisable to install 3 turbo generators of the ASTG-200 type and 4 turbo generators of the TGV-200M type in the designed power system to maintain the specified voltage levels in all operating modes.