25-09-2024 дата публикации
Номер: EP4436027A1
An electrical converter (14) comprising at least two converter branches (14a, 14b) connected in parallel between a power source and/or load (12) and a transformer (16). A method for controlling the electrical converter (14) comprises: measuring a DC link voltage (v<sub>dc,I</sub>, v<sub>dc,II</sub>) and determining a reference DC link voltage vdc,Iref,vdc,IIref of a DC link (26) of each converter branch (14a, 14b); calculating a measured sum voltage (v<sub>dc,sum</sub>), which is the sum of the measured DC link voltages (v<sub>dc,I</sub>, v<sub>dc,II</sub>), and at least one measured difference voltage (v<sub>dc,diff</sub>), which is the difference of two of the at least two measured DC link voltages (v<sub>dc,I</sub>, v<sub>dc,II</sub>); calculating a reference sum voltage vdc,sumref, which is the sum of the reference DC link voltages vdc,Iref,vdc,IIref and at least one reference difference voltage vdc,diffref, which is the difference of two of the at least two reference DC link voltages vdc,Iref,vdc,IIref ; calculating a sum voltage error (Δv<sub>dc,sum</sub>), which is the difference of the measured sum voltage (v<sub>dc,sum</sub>) and the reference measured sum voltage vdc,sumref, and at least one difference voltage error (Δv<sub>dc,diff</sub>), which is the difference of the measured difference voltage (v<sub>dc,diff</sub>) and the reference difference voltage vdc,diffref; determining a sum reference quantity id,sumref,Te,sumref from the sum voltage error (Δv<sub>dc,sum</sub>) by inputting the sum voltage error (Δv<sub>dc,sum</sub>) into a sum PI controller (40a); determining at least one difference reference quantity id,diffref,Te,diffref from the at least one difference voltage error (Δv<sub>dc,diff</sub>) by inputting the difference voltage error (Δv<sub>dc,diff</sub>) ...
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