Secondary control of energy supplies in dc and hybrid microgrids
AssigneeHitachi Energy Ltd
InventorsFaeza HAFIZ, Giovanni PITTO, Andrew Mark TUCKEY
Life of this patent
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Abstract
Direct current (DC) microgrids and hybrid microgrids require controllers for both voltage control and load sharing. Disclosed embodiments are capable of simultaneously calculating values for both voltage control and load sharing, without requiring communication between energy supplies, and combining these values into a single setpoint. This enables the setpoint determination to be comprised in a single controller, which may be provided as a secondary controller which may provide the determined setpoint to a primary controller of each DC/DC converter of each energy supply.
Claims22
A method of controlling an energy supply, the method comprising using a controller of the energy supply to:
- determine a voltage-control value based on a first error between a reference parameter of a bus to which the energy supply is electrically connected and a measured parameter of the bus;
- determine a load-share value based on a second error between a reference power of the energy supply and a measured power output by the energy supply;
- determine a setpoint based on the voltage-control value and the load-share value;
- and
- output the setpoint to control one or both of a voltage of the bus and a power output by the energy supply, according to the setpoint.
A controller for an energy supply, the controller configured to:
- determine a voltage-control value based on a first error between a reference parameter of a bus to which the energy supply is electrically connected and a measured parameter of the bus;
- determine a load-share value based on a second error between a reference power of the energy supply and a measured power output by the energy supply;
- determine a setpoint based on the voltage-control value and the load-share value;
- and
- output the setpoint to control one or both of a voltage of the bus and a power output by the energy supply, according to the setpoint.
Dependencies are inferred from the claim text.