Reactive power prediction capability

1. A system for regulating energy, the system comprising:

an electricity grid;

an energy source;

a grid-tied converter connected to the electricity grid and to ta DC link, the converter being configured to receive the energy from the energy source through the DC link and to supply energy to the electricty grid; and

a controller configured to dynamically predict real-time maximum reactive power capability of the converter that includes a lead maximum reactive power capability and a lag maximum reactyive power capability;

wherein the predicted maximum reactive power capability is configured for optimizing regulation of the energy;

wherein the controller comprises:

a lead maximum reactive power capability prediction module that derives a first lead maximum reactive power signal;

a lead reactive power module that derives a second lead maximum reactive power signal from a zeroth lead maximum reactive power signal with reference to upper and lower threshold voltage levels associated with field grid codes, the reactive output of the converter and the instantaneous line voltage of the electricity grid; and

a lag reactive power module that derives the lag maximum reactive power capability from a zeroth lead maximum reactive power signal with reference to upper and lower threshold voltage levels associated with field grid codes, the reactive output of the converter and the instantaneous line voltage of the electricity grid;

wherein the lead maximum reactive power capability is the minimum of the first lead maximum reactive power signal and the second lead maximum reactive power signal.

2. The system according to claim 1 , wherein the source includes at least one from the group including solar energy and wind energy.

3. The system according to claim 1 , wherein the maximum reactive power capability prediction is independent of interconnected grid impedance.

4. A method for regulating energy provided to an electricity grid from an energy source, the method comprising:

receiving, in a grid-tied converter, the energy from the energy source through a DC link;

dynamically predicting, in the converter, the real time maximum reactive power capability of the converter that includes a lead maximum reactive power capability and a lag maximum power capability; and

configuring the predicted maximum reactive power capability for optimizing regulation of the energy;

wherein dynamically predicting the real time maximum reactive power capability includes:

deriving, using a lead maximum reactive power capability prediction module, a first lead maximum reactive power signal;

deriving, using a lead reactive power module, a second lead maximum reactive power signal from a zeroth lead maximum reactive power signal with reference to upper and lower threshold voltage levels associated with field grid codes, the reactive output of the converter and the instantaneous line voltage of the electricity grid; and

deriving, using a lag reactive power module, the lag maximum reactive power capability from a zeroth lead maximum reactive power signal with reference to upper and lower threshold voltage levels associated with field grid codes, the reactive output of the converter and the instantaneous line voltage of the electricity grid;

wherein the lead maximum reactive power capability is the minimum of the first lead maximum reactive power signal and the second lead maximum reactive power signal.

5. The method according to claim 4 , wherein the source includes at least one from the group including solar energy and wind energy.

6. The method according to claim 4 , wherein the maximum reactive power capability prediction is independent of interconnected grid impedance.