FREQUENCY CONTROL METHOD IN ELECTRIC POWER SYSTEMS Russian patent published in 2023 - IPC H02P9/44 H02J3/06 H02P9/04 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering and can be used in electric power systems, electric networks with distributed generation to automatically maintain the balance of the normal mode in terms of active power during changes in load and power output by power plants. The method for frequency and power control in electric power systems consists in the fact that in case of frequency deviation, the power regulators of the primary engines of power plants carry out static control of the speed of rotation of the generator rotors with a given time for introducing the primary control reserve. The regulator of the power plant allocated for secondary frequency control performs astatic frequency control with a given time for introducing a secondary regulation reserve that exceeds the time for introducing primary regulation reserves, power correctors of generators not participating in secondary astatic regulation, if the secondary regulation power reserve is insufficient, change their power in the opposite direction in relation to the frequency deviation to restore the reserve of secondary regulation with the time of input of its reserve, equal to the time of input of the reserve of secondary regulation. Equal time intervals of a given multiplicity are formed synchronized with the external signal of the satellites in relation to the time of entering the secondary regulation reserve to allocate a secondary frequency regulation power plant, the participation of other power plants in restoring the secondary regulation reserve by correcting their output power, permitting changes in the planned load, at each power plant in the control system. For all power plants of the power system, uniform rules for participation in frequency regulation and changes in the output power, priority for participation in secondary frequency regulation are established once. At each time interval at all power plants, the process controllers, according to the specified rules, identify the compliance of the process with the state class of the frequency and power control system and, depending on the identified state class and their sequence, each controller independently decides on the nature of its participation in frequency control and power balance change in the electric power system without disturbing the power balance in the power system.

EFFECT: simplification of the frequency and power control system in power systems, increasing the reliability of its operation.

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