Patent ID: 11881796
Assignee: ROLLS-ROYCE PLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 8:
9. A controller for use in a system comprising a permanent magnet synchronous electric machine (PMSM) and associated power electronics, the controller being configured to:
receive d-axis and q-axis stator current values (id, iq) representative of a measured PMSM current;
receive d-axis and q-axis reference current values (id*, iq*);
based on the stator current values (id, iq) and the reference current values (id*, iq*), determine d-axis and q-axis current correction values (Cd, Cq) according to the following equations:

Cd(k+1)=Cd(k)+ηeid(k)

Cq(k+1)=Cq(k)+ηeiq(k)

eid(k)=id*(k)·z−m−id(k)

eiq(k)=iq*(k)·z−m−iq(k), wherein η is a pre-selected gain value, and eid and eiq are d-axis and q-axis current errors, and wherein z is the Laplace operator in discrete form, m is an integer greater than or equal to 2, and k is an integer;
determine corrected reference current values (id**, iq**) as a sum of the reference current values (id*, iq*) and the current correction values (Cd, Cq); and
control the PMSM using the corrected reference current values (id**, iq**) as reference current inputs to a Deadbeat Predictive Current Control (DBPCC) scheme.