STUDY OF CRITICAL POWER INTERRUPTION FOR SELFSTARTING SUCCESS

The work is devoted to modeling electromechanical transients when powered from a local source. The object of the study is TKG-1 «Pervomayskaya CHPP», LLC «Shchekinoazot». The time critical for maintaining the initial mode of power interruption is obtained when the design conditions are varied. The problem of evaluating the success of self-launching is programmatically solved in Matlab.

Inverter generator sets for grids carrying heavy-load users

Inverter generator sets (GS) are increasingly common in the electricity industry. The paper dwells upon the core advantages and issues of integrating inverter generator sets that must be considered at the design stage to make informed decisions. The authors present examples of computing the electrical parameters of inverter generator sets in a variety of operating situations. The calculated electromechanical transients show inverter GS’s are more efficient compared to conventional synchronous generators for grid nodes that are ‘weakly connected’ to the grid as well as for islanded operation. The paper further proves that automatic control systems of GS inverters can feasibly feature parameter control laws that conform to the general and additional requirements of the system, which in turn are based on the parameter calculations. It shows that a feasibility study is needed to decide whether to use inverter GS’s.

Mathematical model of a drive system with synchronous motors and vertical pumps

The paper presents a mathematical model of an electrical load node consisting of a power transformer and synchronous motors which rotate vertical pumps using non-rigid transmission. Modified principle of Hamilton–Ostrogradsky served as the basis for construction of the model. Using the developed mathematical model of the node, electromechanical transients in the object are studied. The resultant system of dynamic state nonlinear differential equations is introduced in the normal Cauchy’s form. Computer simulation findings are displayed by means of figures; they are under ongoing analysis.