AUTONOMOUS ASYNCHRONOUS GENERATOR CONTROL DEVICE Russian patent published in 2020 - IPC H02P9/46 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, in particular to control device of self-contained asynchronous generator. Self-contained asynchronous generator control device, its power part (fig. 1) contains asynchronous generator (1) with three phase windings U, V, W, connected in generator (1) by common point – neutral N and similarly outputted wire. Self-excitation capacitors (2) of asynchronous generator (1) having low capacitance are connected to phase windings and neutral elements U, V, W, N. Phase winding capacitors (3) are connected to phase windings and neutral elements U, V, W, N by their one end to provide additional excitation of asynchronous generator (1) at load connection. Switching of other ends of units of phase boosting capacitors (3) is performed by units of three-phase electronic switches (4) to phases U, V, W of asynchronous generator (1). In units of three-phase electronic switches (4) transistor alternating current switches are used as keys. Transistor keys of alternating current unlike thyristors provide switching on and off at required moments in time. Electronic switches (4) units are controlled by control circuits (5) by control system (6). Independent control of each AC switch in the unit of three-phase electronic switches (4) is possible. Units of phase boosting capacitors (3) and electronic switch units (4) may be several depending on capacity of asynchronous generator (1) and required accuracy of voltage regulation. Monitoring of actual voltage of generator (1) is carried out in each phase U, V, W, and their values by voltage control circuits (7) are transmitted to control system (6). In each phase of asynchronous generator (1) current transformers (8) are installed. According to primary windings of current transformers (8), phase load currents i₁ flow. By currents of current transformers (8) secondary currents i₂ flow and current control circuits (9) are supplied to control system (6). At the output of asynchronous generator (1) behind current transformers 8 there is switch (10) of asynchronous generator (1). Control system (6) (fig. 2) comprises: phase voltage value converter (11); transducers of phase voltages (12) passing through zero; timer (13), which is synchronized with voltage of asynchronous generator (1), through phase voltage value converter (11); scaling converters (14) of current transformer current (8) secondary current i_2u, i_2v, i_2w value; secondary current transducers (15) through zero of each phase; measuring synchronized secondary phase current sensors (16) synchronized by timer (13) with voltage of asynchronous generator (1); load power calculation unit (17) connected to asynchronous generator (1); unit for calculating required capacitance (18) of phase forcing capacitors (3); driver (19) for controlling control units of electronic switches (4) synchronized with the voltage of asynchronous generator (1); power supply unit (20) of control system (6) elements.

EFFECT: technical result is accurate and fast determination of value of connected load and accurate determination of capacity value of boosting capacitors, higher dynamic stability of asynchronous generator, shorter duration of transient processes and higher quality of electric power.

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