Method and device for the control of a three-phase inverter
AssigneePower-One Italy S.p.A.
InventorsEttore Marroni, David Martini
Life of this patent
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Abstract
A method of controlling an inverter to includes determining the components of a phasor representing the output current from the inverter in a fixed reference system; determining the components of the current phasor in a reference system rotating at a velocity equal to the velocity of rotation of the phasor representing the grid voltage; and comparing the components of the current phasor in the rotating reference system with a reference, again expressed in the rotating reference system, to determine an error signal, by means of which the inverter is controlled.
Claims12
A method for regulating an inverter connected to an electrical power source and in parallel to a three-phase grid to supply power generated by said source to said three-phase grid in a manner synchronized with respect to the voltages on the phases of the grid, comprising the steps of:
- determining components of a phasor representing an output current from the inverter in a fixed reference system;
- determining components of a current phasor in a reference system rotating at a velocity equal to a velocity of rotation of a phasor representing a grid voltage;
- and
- comparing the components of the current phasor) in the rotating reference system with a reference, again expressed in the rotating reference system, to determine an error signal, by means of which said inverter is driven.
A system comprising:
- an electrical power source;
- a three-phase inverter, and a three-phase grid, the inverter connected in parallel to a three-phase grid, the inverter having an input which receives power from said source to supply power generated by said source to the electrical power grid, in synchronism with the grid voltage, and a control functional to drive said inverter, said control being functional to
- determine components of a phasor representing an output current from the inverter in a fixed reference system;
- determine components of a current phasor in a reference system rotating at a velocity equal to a velocity of rotation of a phasor representing a voltage on the grid;
- and
- compare the components of the current phasor in the rotating reference system with a reference, again expressed in the rotating reference system, to determine an error signal, by means of which said inverter is driven.
Dependencies are inferred from the claim text.