US 12,143,058 B2
Voltage control of a DC-link
Nuno Miguel Amaral Freire, Brande (DK); Tao Wang, Sheffield (GB); and Zi-Qiang Zhu, Sheffield (GB)
Assigned to Siemens Gamesa Renewable Energy A/S, Brande (DK)
Appl. No. 17/925,720
Filed by Siemens Gamesa Renewable Energy A/S, Brande (DK)
PCT Filed May 7, 2021, PCT No. PCT/EP2021/062159
§ 371(c)(1), (2) Date Nov. 16, 2022,
PCT Pub. No. WO2021/239441, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 20176906 (EP), filed on May 27, 2020.
Prior Publication US 2023/0246577 A1, Aug. 3, 2023
Int. Cl. H02P 9/00 (2006.01); F03D 7/02 (2006.01); H02P 9/02 (2006.01); H02P 9/10 (2006.01)
CPC H02P 9/102 (2013.01) [F03D 7/0284 (2013.01); H02P 9/02 (2013.01); F05B 2270/337 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An arrangement for controlling a DC-link-voltage of a DC-link connected between a generator side converter portion and a utility grid side converter portion of a wind turbine, the arrangement comprising:
a generalized predictive control module adapted:
to receive as control module input values a measured value of the DC-link-voltage and a reference value of the DC-link-voltage, and
to derive a reference value of a DC current based on the control module input values, the reference value of a DC current defining the DC current to be injected into the DC-link,
wherein the arrangement is adapted to control the generator side converter portion or the utility grid side converter portion based on the reference value of the DC current, and
further comprising an arithmetic element receiving as arithmetic element input values at least:
the reference value of the DC current,
the measured value of the DC-link-voltage,
the arithmetic element being adapted to calculate a q-component of the reference value of the stator current or a d-component value of the reference value of the grid current in a synchronous reference frame based on the arithmetic element input values;
wherein, if control of the generator side converter portion is performed, the arithmetic element input values further comprise:
a pole pair number;
a mechanical rotational speed of the generator;
a permanent flux linkage of the permanent magnets of the generator;
wherein the arithmetic element is adapted to calculate the q-component of the reference value of the stator current in the synchronous reference frame, wherein the arrangement is adapted by additionally using a predetermined d-component of the reference value of the stator current in the synchronous reference frame, to obtain a complex reference value of the stator current in the synchronous reference frame, and/or
wherein, if control of the grid side converter portion is performed, the arithmetic element input values further comprise:
an amplitude of a grid voltage,
wherein the arithmetic element is adapted to calculate the d-component of the reference value of the grid current in the synchronous reference frame, wherein the arrangement is adapted by additionally using a predetermined q-component of the reference value of the grid current in the synchronous reference frame, to obtain a complex reference value of the grid current in the synchronous reference frame.