FAST MODEL PREDICTIVE PULSE PATTERN CONTROL

摘要

A method for controlling an electrical converter comprises the acts of determining an error value based on a difference between an estimated output value and a reference output value, the estimated output value being based on measurements in the electrical converter; comparing the error value with an error band and in the case of the error value exceeds the error band, controlling the electrical converter by switching to a different control scheme. The converter is controlled with the modified pre-calculated switching by determining a pre-calculated switching sequence for the converter based on an actual state of the electrical converter, the switching sequence comprising a sequence of switching transitions of the converter; modifying the pre-calculated switching sequence by modifying transition times of switching transitions of the pre-calculated switching sequence, such that the error value is minimized; and applying at least a part of the modified switching sequence to the electrical converter.

主权项

1. A method for controlling an electrical converter, the method comprising:
determining an error value based on a difference between an estimated output value and a reference output value the estimated output value being based on measurements in the electrical converter; comparing the error value with an error band and in the case of the error value being within the error band, controlling the electrical converter with a modified pre-calculated switching sequence by: determining a pre-calculated switching sequence for the converter based on an actual state of the electrical converter, the switching sequence comprising a sequence of switching transitions of the converter; modifying the pre-calculated switching sequence by modifying transition times of switching transitions of the pre-calculated switching sequence, such that the error value is minimized; applying at least a part of the modified switching sequence to the electrical converter; in the case where the error value exceeds the error band, controlling the electrical converter by switching to a different control scheme; whereby the different control scheme is based on inserting an additional switching transition into the pre-calculated switching sequence before the pre-calculated switching sequence is modified and the additional switching transition generate an additional pulse with an infinitesimal small width; selecting an error band associated with the error value from a plurality of error bands, whereby a voltage level of the inserted switching transition is dependent on the determined error band and a selection of an error band is based on past error values.