METHOD FOR CONTROLLING MODE OF PARALLEL OPERATION OF SYNCHRONOUS GENERATORS IN ELECTRICAL NETWORKS Russian patent published in 2021 - IPC H02J3/38 

FIELD: power industry.

SUBSTANCE: invention relates to the field of electric power industry. The method for controlling the mode of parallel operation of synchronous generators in electric networks consists in the fact that two constant sections are fixed for dividing in case of emergency unbalances: the first for normal modes with the output of power by LPSS generators to the external electrical network, the second with the consumption of LPSS power from the external network. In normal mode, with the output of power, one or more LPSS generators are loaded to the value of the output power in the first section and, upon a sudden deep voltage drop ahead of the short-circuit shutdown, the switches of the first section and LPSS generators loaded to the value of the output power in the first section are turned off in the normal mode of LPSS power consumption from the external network, its generators are loaded to zero overflow of active power along the second section and, upon a sudden deep voltage drop ahead of the short-circuit shutdown, the switches of the second section are turned off, switching the LPSS into autonomous operation mode, and when the normal mode is restored in the external electrical network, the LPSS generators are synchronized with it and the normal mode of parallel operation of the LPSS with the network is restored. When disconnecting the LPSS from the external electrical network with the transition to an autonomous mode, the gap and the statism of the frequency regulators are reduced, and the balanced separation of the LPSS from the external electrical network is carried out without a deep voltage reduction when the frequency goes beyond the established limits, after switching the LPSS to parallel operation with the external electrical network, the coefficients of statism and the gap of frequency regulation of the frequency regulators of the LPSS generators are changed to those required for parallel operation with the maximum permissible gap.

EFFECT: ensuring a balanced separation of local power supply systems (LPSS) from the external electrical network both in case of close short circuits, and when allocating part of the external electrical network with recharge from LPSS generators without short circuits, the participation of LPSS generators in the general primary regulation of the frequency of the external electrical network in parallel operation, increasing the efficiency of LPSS generators and their operational life.

1 cl, 4 dwg