Patent ID: 11916391
Assignee: WOBBEN PROPERTIES GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F  Y | IPC F  H

Claim 6:
7. A wind power installation, comprising:
at least one inverter; and
a controller configured to:
receive, for a three-phase electrical system, measurements of a first voltage of a first phase, a second voltage of a second phase and a third voltage of a third phase;
determine, from the first, second and third measured voltages, a symmetrical negative-sequence voltage system including a first negative-sequence voltage, a second negative-sequence voltage and a third negative-sequence voltage;

configure, using a transformation and depending on the determined symmetrical negative-sequence voltage system, setpoints for a negative-sequence current system including a first negative-sequence system component for the first phase, a second negative-sequence system component for the second phase and a third negative-sequence system component for the third phase, wherein the setpoints are configured to balance the first, second and third voltages configuring the setpoints including:
transforming the determined first, second and third negative-sequence voltages into respective dq coordinates using an amplitude-invariant dq transformation, wherein the first negative-sequence voltage is transformed into a first pair of amplitude-invariant dq coordinates, wherein each amplitude-invariant dq coordinate of the first pair of amplitude-invariant dq coordinates has the same amplitude as the first negative-sequence voltage and a phase angle that is modified based on the first negative-sequence voltage; and
transforming the respective dq coordinates into respective abc coordinates to produce the setpoints for the negative-sequence current system; and
cause an asymmetrical three-phase AC current to be fed into a wind farm network or an electrical supply network depending on the configured setpoints.