Litkovets S. Optimization of modes of static thyristor compensators with forced commutation and phase-by-phase control of reactive power

The object of the research is modes of static thyristor compensators (STC) with forced commutation and phase-by-phase control of reactive power. The objective of the research is to increase the efficiency of STC with forced commutation in electric grids by means of optimization of operation modes of compensators and improvement of methods and tools of phase-by-phase control of reactive power. Methods of investigation: the classic method of solving differential equations, a method of adjusting of coordinates, integral (operator) method, the method of the least squares. The theoretical results: for the first time the method of multicoordinate control of STC with forced commutation is implemented, which allows to provide phase-by-phase control of reactive power with a wider range of its adjustment and to reduce active power losses through independent control by switching thyristors due to a target system function; new mathematical models STC with forced commutation are developed and they, unlike already known ones, are based on the use of generalized mathematical models of electromagnetic processes in power circles of compensators as systems with variable structure and parameters; they also create conditions for optimization modes of their operation; the method of optimization of parameter of STC with forced commutation was developed; it allows to increase the coefficient of volt adding during the negative half-wave voltage, to increase of the compensator's response speed and to reduce losses of active power; the method of control of reactive power by change the width of the pulse of voltage supply in the case of symmetric and asymmetric switching thyristors is improved, which allows to reduce the active power losses while adjusting the reactive power. Practical results: the method of adjusting the reactive power at STC with forced commutation by changing the width of the pulse voltage supply is proposed, which allows to implement efficient technologies of phase-by-phase control of reactive power; the schemes of reactive power regulators for STC with forced commutation are developed, which allows to reduce active power losses, and to increase compensator's installations response speed; schemes for phase-by-phase control of reactive power in STC with forced commutation are developed, which allows to synchronize operation systems with the grid as well as to provide microprocessor control in real-time and to implement the necessary algorithm of switching all system elements according to the values of its objective functions. The degree of implementation - the results are implemented in JC "Airport Shymkent" and transferred to the separate department of "Volyn Main Electrical Networks" SE "NEC "Ukrenergo" and are implemented in the educational process in Lutsk National Technical University. Area of implementation: electrical engineering.