METHOD OF EMERGENCY CONTROL OF THE MODE OF PARALLEL OPERATION OF SYNCHRONOUS GENERATORS IN ELECTRICAL NETWORKS Russian patent published in 2018 - IPC H02J3/46 

FIELD: electric power engineering.

SUBSTANCE: use: in electric power engineering. Method consists in determining the cross sections of the network for division in the normal mode. When an emergency disturbance occurs, the network is divided. In the after-failure mode with the separation of the network at an increased frequency in the low-power part of the network, the output power of the generators is reduced, and part of the load is cut off at a reduced frequency. Voltage and output power of the remaining generators are regulated, the separated low- and high-power parts of the network are synchronized and switched to parallel operation. Normal mode is restored. In this case, two fixed cross-sections are used to divide the network into high- and low-power parts. First one – for normal modes with power output by a low-power part of the network, the second – with power consumption. In normal mode with the power output by a low-power part of the network, one or more generators are loaded up to the value of the output power in the first cross-section. Upon a sudden deep voltage drop with the anticipation of short circuit clearing, the first-section switches and the generators of the low-power part of the network loaded up to the value of the output power in the first cross-section are disconnected. In the normal mode of power consumption, the low-power part of the network is loaded by its generators to a zero active-power flow in the second cross-section. Upon the fact of a sudden deep voltage drop with the anticipation of short circuit clearing, the switches of the second section are disconnected.

EFFECT: prevention of the occurrence of unacceptable dynamic moments on the shafts of synchronous generators and asynchronous modes with their parallel operation, reduction of cutoff short-circuit currents, decrease in the values of the powers of disconnected loads, generators, reduction of the need for telemetric information.

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