lrpv.gov.lv/sites/lrpv/files/ (on page 28) (57) Izgudrojuma attiecas uz elektrotehniku un to var izmantot
vēja enerģētiskās iekārtās. Tā mērķis ir palielināt asinhronā ģeneratora rotācijas frekvences izmantošanas diapazonu. Paralēli asinhronās mašīnas statora fāžu tinumiem 2 pievienots trīsfāžu vadāmais
tiltiņš 5, kurš savienots ar superkondensatoru 6. Paralēli superkondensatoram pieslēgts līdzstrāvas regulators 8 un līdzstrāvas-maiņstrāvas enerģijas pārveidotājs 7. Līdzstrāvas regulators 7 savienots
ar mašīnas fāžu rotora diviem tinumiem, bet rotora fāžu tinumu 3
galos ieslēgts nullpunkta pārtraucējs 4. Pie nosacījuma, ka rotora 11
rotācijas frekvence ir lielāka par mašīnas sinhrono rotācijas frekvenci, tā darbojas ģeneratora režīmā ar tīklu, bet pie pretējiem nosacījumiem tā darbojas kā sinhronais ģenerators.
The invention refers to electrical engineering domain and can be
applied in the wind energy installations. The aim of the invention
is to increase the range of induction generator rotation frequency
application. Three-phase controlled rectifier 5 is connected in
parallel with the stator winding of the induction machine. The
rectifier in its turn is connected to supercapacitor 6. DC regulator 8
and DC-AC converter 7 are also in parallel with the supercapacitor.
DC regulator 7 is connected with two windings of the machine phase
rotor, but zero-point*** chopper*** 4 is joined to rotor phase winding 3.
As the rotation frequency of rotor 11 is higher than synchronous
rotation frequency of the machine it operates in the generator mode,
but under the opposite conditions that is of synchronous generator
mode.

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Note added at 1 day 13 hrs (2023-01-01 00:39:37 GMT)
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Do not know, not my field. Maybe explain more of the system. https://www.mdpi.com/1996-1073/11/2/397
This paper proposes the inrush current suppressor using an AC chopper in a large-capacity wind power generation system (WPGS) with two squirrel-cage induction machines (SCIMs), which are switched over depending on the wind speed. The input side of the AC chopper is connected to the source in parallel. The output side of the AC chopper is connected in series with the SCIM through matching transformers. In the proposed inrush current suppressor, the output voltage of the AC chopper is the same as the receiving-end voltage before connecting the SCIM. By gradually decreasing the output voltage of the AC chopper, the applied voltage of the SCIM is gradually increased without the inrush current. The basic principle of the proposed inrush current suppressor is discussed in detail. A computer simulation is implemented to confirm the validity and practicability of the proposed inrush current suppressor using a power system computer-aided design/electromagnetic transients including DC (PSCAD/EMTDC). Simulation results demonstrate that the proposed inrush current suppressor can suppress the inrush current.
Keywords: wind power generation; AC chopper; inrush current; voltage sag