The present disclosure describes a method and an apparatus for estimating a capacitance of a DC link of a three-phase voltage-source converter. The voltage-source converter comprises means for controlling a power flow of the DC link responsive to a control reference. The method comprises generating an excitation signal with a plurality of levels of the power flow, using the excitation signal temporarily as the control reference in order to control a temporary change to the power flow, monitoring a voltage response induced to the DC link voltage by the temporary change in the power flow, calculating a change in energy stored in the DC link caused by the temporary change in the power flow, and estimating the capacitance of the DC link on the basis of the voltage response and the change in energy stored in the DC link.
|IPC||H02M 7/ 527 A I|
|Publication status||Published - 27 Sep 2017|
|MoE publication type||H1 Granted patent|