公开(公告)号：US20210328495A1

公开(公告)日：2021-10-21

申请号：US17273038

申请日：2018-09-03

Applicant: ABB Power Grids Switzerland AG

Inventor： Xinhua Ke ,  Beat Buchmann

IPC: H02M1/00 ,  H02M5/04 ,  G05B6/02

Abstract: A method performed by a control system of a power electronics converter. A first part of a grid-side current controller runs a first feedback control algorithm having a first control cycle time and includes at least proportional control using a proportional gain. A third part of the controller runs a third feedback control algorithm having the first control cycle time and acting on an output from the first control algorithm after SOA limits have been applied and includes counteracting the proportional control of the first feedback control algorithm. A second part of the controller runs a second feedback control algorithm having a second control cycle time, less than the first control cycle time, and acting on an output from the third control algorithm with the same polarity as the first control algorithm and includes proportional control using the proportional gain.

公开(公告)号：US10985668B2

公开(公告)日：2021-04-20

申请号：US16625404

申请日：2017-06-21

Applicant: ABB Power Grids Switzerland AG

Inventor： Cosmin Banceanu ,  Xinhua Ke

IPC: H02M5/14 ,  H02M5/293

Abstract: A method of an estimator of an inner control loop controlling a three-to-single-phase converter connected to an AC power grid via a transformer includes obtaining a value of a voltage reference uRef produced by the inner control loop for the converter, obtaining a value of a secondary side current produced by the converter and measured between the converter and the transformer, obtaining a value of a primary side current produced by the converter and measured between the grid and the transformer, and obtaining a value of a primary side voltage measured between the grid and the transformer. The method also includes estimating a control current iCtrl component of the primary or secondary side current iMeas which results from the voltage reference, based on the obtained values of the voltage reference, the secondary side current, the primary side current and the primary side voltage, and feeding the estimated control current iCtrl* to the inner control loop.