Controlling a modular converter in two stages
AssigneeABB Technology AG
InventorTobias GEYER
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Abstract
A modular converter having a plurality of converter modules for converting an input voltage into an output voltage to be supplied to a load by receiving a control input reference vector, a control input vector and a control input parameter vector; determining a control output reference vector from the control input reference vector, the control input vector and the control input parameter vector in a first control stage; and controlling the converter modules by generating switching signals based on the control output reference vector in a further control stage.
Claims20
A method for controlling a modular converter, the modular converter including a plurality of converter modules configured for converting an input voltage into an output voltage to be supplied to a load, the method comprising:
- receiving a control input reference vector, a control input vector and a control input parameter vector;
- determining a control output reference vector from the control input reference vector, the control input vector and the control input parameter vector in a first control stage;
- and
- controlling the converter modules by generating switching signals based on the control output reference vector in a further control stage;
- wherein the control output reference vector is determined by:
- predicting at least one future state of the modular converter with a prediction model of the modular converter, wherein the prediction model is adapted for calculating the future state of the modular converter based on an actual state of the modular converter, a state of the modular converter having current values and/or voltage values of the modular converter;
- enhancing the at least one future state with respect to an objective function, wherein the objective function is based on a cost value associated with switching costs of the converter modules;
- and
- determining the control output reference vector from the future state.
A controller for controlling a modular converter, wherein the controller is configured for performing the steps of:
- predicting at least one future state of the modular converter with a prediction model of the modular converter, wherein the prediction model is adapted for calculating the future state of the modular converter based on an actual state of the converter, a state of the modular converter having current values and/or voltage values of the modular converter;
- enhancing the at least one future state with respect to an objective function, wherein the objective is based on a cost value associated with switching costs of converter modules of the modular converter;
- and
- determining a control output reference vector from the future state.
Dependencies are inferred from the claim text.