Method for controlling single-phase dc/ac converters and converter arrangement
AssigneeABB Research Ltd.
InventorsAntonio Coccia, Francisco Canales, Leonardo-Augusto Serpa, Mikko Paakkinen
Life of this patent
Estimating the term…
Abstract
A method is disclosed for controlling single-phase DC/AC converters, along with a converter arrangement having at least two single-phase DC/AC converters. A controller is provided which can control the at least two single-phase DC/AC converters, and an isolation transformer, wherein outputs of the at least two single-phase DC/AC converters are cascade-connected with each other and an input of the isolation transformer. The controller is configured to control the at least two single-phase DC/AC converters to deliver power from their inputs to their outputs by turns.
Claims17
A converter arrangement comprising:
- at least two single-phase DC/AC converters;
- control means for controlling the at least two single-phase DC/AC converters, the control means being configured to control the at least two single-phase DC/AC converters to deliver power from their inputs to their outputs by turns;
- and
- an isolation transformer, wherein
- outputs of said at least two single-phase DC/AC converters are cascade-connected with each other and an input of the isolation transformer.
A method for controlling single-phase DC/AC converters in an arrangement having at least two single-phase DC/AC converters and an isolation transformer, the method comprising:
- cascade-connecting outputs of said at least two single-phase DC/AC converters with each other and an input of the isolation transformer;
- and
- controlling, in turns, each of the at least two single-phase DC/AC converters to deliver power from its input to its output in delivery periods such that each of the at least two single-phase DC/AC converters has one delivery period during a predetermined switching period wherein, when a number of the at least two single-phase DC/AC converters is N, a length of one such delivery period is 100%/2N of the predetermined switching period and starting times of two successive delivery periods by two different single-phase DC/AC converters are spaced by 100%/N of the predetermined switching period.
A computer program product configured as a computer readable medium containing computer program code, wherein execution of the program code in a computer causes the computer to perform a method comprising:
- controlling, in turns, each of the at least two single-phase DC/AC converters, the outputs of which are cascade-connected with each other and an input of an isolation transformer, to deliver power from its input to its output in delivery periods such that each of the at least two single-phase DC/AC converters has one delivery period during a predetermined switching period wherein, when a number of the at least two single-phase DC/AC converters is N, a length of one such delivery period is 100%/2N of the predetermined switching period and starting times of two successive delivery periods by two different single-phase DC/AC converters are spaced by 100%/N of the predetermined switching period.
A converter system comprising:
- at least two single-phase DC/AC converters;
- a controller configured to control the at least two single-phase DC/AC converters to deliver power from their inputs to their outputs by turns;
- and
- an isolation transformer, wherein
- outputs of said at least two single-phase DC/AC converters are cascade-connected with each other and an input of the isolation transformer.
Dependencies are inferred from the claim text.