Control of a microgrid
A control method performed in a microgrid. The microgrid includes at least one electrical power source and/or configured for injecting electrical power into the microgrid, a first point of common coupling (PCC) configured for allowing a first power flow between the microgrid and a first power grid, and a second PCC configured for allowing a second power flow between the microgrid and a second power grid. The method includes obtaining information about a change in the first power flow, and controlling the second power flow based on the obtained information.
1. A control method performed in a microgrid comprising:
at least one electrical power source configured for injecting electrical power into the microgrid;
a first point of common coupling, PCC, configured for allowing a first power flow between the microgrid and a first power distribution grid; and
a second PCC configured for allowing a second power flow between the microgrid and a second power distribution grid;
the method comprising:
obtaining (S 1 ) information about a change in the first power flow; and
controlling (S 2 ) the second power flow based on the obtained (S 1 ) information about the change in the first power flow through the first PCC.
2. The method of claim 1 , wherein the obtaining information (S 1 ) includes controlling the change in the first power flow simultaneously with controlling (S 2 ) the second power flow.
3. The method of claim 2 , wherein the controlling (S 2 ) of the second power flow comprises controlling the second power flow to be constant despite the change in the first power flow, or to be changed step-wise or slope-wise.
4. The method of claim 1 , wherein the controlling (S 2 ) of the second power flow comprises controlling the second power flow to be constant despite the change in the first power flow, or to be changed step-wise or slope-wise.
5. The method of claim 1 , wherein the change in the first power flow is to zero, corresponding to islanding of the microgrid at the first PCC.
6. The method of claim 1 , wherein the change in the first power flow is from zero, corresponding to resynchronisation after islanding of the microgrid at the first PCC.
7. The method of claim 1 , wherein the controlling (S 2 ) of the second power flow comprises controlling the second power flow by adjusting the injection of electrical power by the at least one electrical power source.
8. The method of claim 1 , wherein the microgrid further comprises a converter interfacing the second PCC;
wherein the controlling (S 2 ) of the second power flow comprises controlling the second power flow by means of said interfacing converter.
9. The method of claim 1 , wherein the first power distribution grid is connected to the second power distribution grid for allowing electrical power to flow there between.
10. The method of claim 1 , wherein the microgrid further comprises a third PCC configured for allowing a third power flow between the microgrid and a third power distribution grid;
wherein the method further comprises controlling (S 3 ) the third power flow based on the obtained (S 1 ) information about the change in the first power flow and/or on the controlling (S 2 ) of the second power flow.
11. The method of claim 1 , wherein the at least one electrical power source comprises a distributed generator and/or a power storage.
12. A computer program product comprising computer-executable components for causing a control system of a microgrid to perform the method of claim 1 when the computer-executable components are run on processor circuitry comprised in the control system.
13. A control system configured for a microgrid, said microgrid comprises:
at least one electrical power source configured for injecting electrical power into the microgrid;
a first point of common coupling, PCC, configured for allowing a first power flow between the microgrid and a first power distribution grid; and
a second PCC configured for allowing a second power flow between the microgrid and a second power distribution grid;
the control system being configured for:
obtaining information about a change in the first power flow; and
controlling the second power flow based on the obtained information about the change in the first power flow through the first PCC.
14. A microgrid comprising:
at least one electrical power source configured for injecting electrical power into the microgrid;
a first point of common coupling, PCC, configured for allowing a first power flow between the microgrid and a first power distribution grid;
a second PCC configured for allowing a second power flow between the microgrid and a second power distribution grid; and
the control system configured for:
obtaining information about a change in the first power flow; and
controlling the second power flow based on the obtained information about the change in the first power flow through the first PCC.