Energy signatures to represent complex current vectors
A distributed control node enables monitoring of complex energy signatures for local loads. The control node can identify energy signatures unique to local loads. The energy signature includes a complex current vector for the load in operation identifying the primary current with a real power component and a reactive power component, and identifying one or more harmonics each with a real power component, a reactive power component, and an angular displacement relative to the primary current. Based on the energy signature, the control node can control a noise contribution of the load due to the harmonics as seen at a point of common coupling to reduce noise introduced onto the grid network from the load.
1. A method for monitoring power at a power grid node, comprising:
obtaining dispatch information at a local grid control device located at a consumer premises on a same side of a point of common coupling (PCC) to a grid network as a local load, the dispatch information indicating an electrical condition of the grid network at the PCC;
identifying an energy signature unique to the local load, the energy signature including a complex current vector for the load in operation identifying for the primary current a real power component and a reactive power component, and identifying for the harmonics a vector including a real power component, a reactive power component, and an angular displacement of the vector relative to the primary current; and
adjusting an operation at the PCC in response to the dispatch information and the energy signature to control a noise contribution of the load due to the harmonics as seen at the PCC to reduce noise introduced onto the grid network from the load.
2. The method of claim 1 , wherein obtaining the dispatch information comprises:
receiving load information from another local grid control device located on the grid network on a different side of the PCC.
3. The method of claim 1 , wherein obtaining the dispatch information comprises:
receiving information from a utility controller.
4. The method of claim 1 , wherein obtaining the dispatch information further comprises:
receiving information indicating a node on the grid network requiring voltage support; and further comprising:
determining the PCC is downstream on the grid network relative to the node of the grid network requiring voltage support; and
providing positive reactive power to the grid network.
5. The method of claim 1 , wherein obtaining the dispatch information further comprises:
receiving information indicating a node on the grid network requiring voltage support; and further comprising:
determining the PCC is upstream on the grid network relative to the node of the grid network requiring voltage support; and
providing negative reactive power to the grid network.
6. The method of claim 1 , wherein controlling the noise contribution from the harmonics of the load further comprises:
adjusting a reactive power output component of a local energy source coupled to the same side of the PCC as the load.
7. The method of claim 1 , wherein controlling the noise contribution from the harmonics of the load further comprises:
adjusting a reactive current component delivered to the load, to create a reactive current that offsets the energy signature for the load.
8. A distributed control node within a power grid system, comprising:
a grid connector to couple a load to a grid network of the power grid system, where the load includes one of multiple different devices electrically coupled on the same side of a point of common coupling (PCC) at a consumer premises; and
a controller to obtain dispatch information indicating an electrical condition of the grid network at the PCC; identify an energy signature unique to the local load; the energy signature including a complex current vector for the load in operation identifying for the primary current a real power component and a reactive power component, and identify for the harmonics a vector including a real power component, a reactive power component, and an angular displacement of the vector relative to the primary current; and, adjust an operation at the PCC in response to the dispatch information and the energy signature to control a noise contribution of the load due to the harmonics as seen at the PCC to reduce noise introduced onto the grid network from the load.
9. The distributed control node of claim 8 , wherein the controller is to receive load information from another local grid control device located on the grid network on a different side of the PCC.
10. The distributed control node of claim 8 , wherein the controller is to receive information from a utility controller.
11. The distributed control node of claim 8 , wherein the controller is to receive information indicating a node on the grid network requiring voltage support; and further comprising the controller to determine the PCC is downstream on the grid network relative to the node of the grid network requiring voltage support, and provide positive reactive power to the grid network.
12. The distributed control node of claim 8 , wherein the controller is to receive information indicating a node on the grid network requiring voltage support; and further comprising the controller to determine the PCC is upstream on the grid network relative to the node of the grid network requiring voltage support, and provide negative reactive power to the grid network.
13. The distributed control node of claim 8 , wherein the controller is to adjust a reactive power output component of a local energy source coupled to the same side of the PCC as the load.
14. The distributed control node of claim 8 , wherein the controller is to adjust a reactive current component delivered to the load, to create a reactive current that offsets the energy signature for the load.
15. A power grid system, comprising:
a load electrically coupled to a point of common coupling (PCC) at a consumer premises; and
a control node coupled to the load at a same side of the PCC as the load, the control node including
a controller to obtain dispatch information indicating an electrical condition of the grid network at the PCC; identify an energy signature unique to the local load; the energy signature including a complex current vector for the load in operation identifying for the primary current a real power component and a reactive power component, and identify for the harmonics a vector including a real power component, a reactive power component, and an angular displacement of the vector relative to the primary current; and
a power converter adjust an operation in response to the dispatch information and the energy signature to control a noise contribution of the at least one load due to the harmonics as seen at the PCC to reduce noise introduced onto the grid network from the load.
16. The power grid system of claim 15 , wherein the controller is to receive load information from another local grid control device located on the grid network on a different side of the PCC.
17. The power grid system of claim 15 , wherein the controller is to receive information from a utility controller.
18. The power grid system of claim 15 , wherein the controller is to receive information indicating a node on the grid network requiring voltage support; and further comprising the controller to determine the PCC is downstream on the grid network relative to the node of the grid network requiring voltage support, and provide positive reactive power to the grid network.
19. The power grid system of claim 15 , wherein the controller is to receive information indicating a node on the grid network requiring voltage support; and further comprising the controller to determine the PCC is upstream on the grid network relative to the node of the grid network requiring voltage support, and provide negative reactive power to the grid network.
20. The power grid system of claim 15 , wherein the controller is to adjust a reactive current component delivered to the load, to create a reactive current that offsets the energy signature for the load.