Total harmonic control
A distributed control node enables total harmonic control. The control node measures current drawn by a load, including harmonics of the primary current. A metering device can generate an energy signature unique to the load including recording 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 the harmonics with a real power component, a reactive power component, and an angular displacement relative to the primary current. 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 grid control, comprising:
measuring current drawn by a load, including harmonics of the current, with a metering device located on a consumer side of a point of common coupling (PCC) of a consumer premises to a grid network, which is a same side of the PCC as the load, where the load includes one of multiple different devices electrically coupled on the consumer side of the PCC;
computing an angular displacement of harmonics, which include harmonic components of the current, relative to a primary current, which is a main energy component of the current;
generating an energy signature unique to the load including recording 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 real power component, a reactive power component, and the angular displacement relative to the primary current; and
adjusting an energy output of a power converter at the consumer premises on the consumer side of the PCC to control a noise contribution of the load due to the harmonics as seen at the PCC from a grid side that is not the same side of the PCC as the load, based on harmonics identified in the energy signature for the load, to reduce noise introduced onto the grid network from the load.
2. The method of claim 1 , wherein adjusting the energy output to control the noise contribution from the harmonics of the load further comprises:
adjusting a reactive power output component of the power converter from energy generated by a local energy source coupled to the consumer side of the PCC.
3. The method of claim 1 , wherein adjusting the energy output to control 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 harmonics identified in the energy signature for the load.
4. The method of claim 1 , wherein adjusting the energy output to control the noise contribution from the harmonics of the load further comprises:
reducing a frequency of an operating voltage of the load.
5. The method of claim 1 , further comprising:
sending information about current drawn by the load to a control device on the grid network that is on the grid side of the PCC.
6. The method of claim 5 , wherein sending the information about the current drawn by the load to the control device comprises:
sending the information about the current drawn by the load to a grid controller.
7. The method of claim 5 , wherein sending the information about the current drawn by the load to the control device comprises:
sending the information about the current drawn by the load to a different control node of the grid network.
8. A distributed control node within a power grid system, comprising:
a grid connector to couple a load to the power grid system, where the load includes one of multiple different devices electrically coupled on a consumer side of a point of common coupling (PCC) to the power grid system at a consumer premises, which is a same side of the PCC as the load;
a metering device located on the consumer side of the PCC to the power grid system as the load, the metering device to measure current drawn by the load;
a controller device to compute an angular displacement of harmonics, which include harmonic components of the current, relative to a primary current, which is a main energy component of the current, and to generate an energy signature unique to the load including recording of a complex current vector for the load in operation identifying for the primary current a real power component and a reactive power component, and identification of a real power component, a reactive power component, and an angular displacement relative to the primary current for the harmonics, the controller further to adjust an energy output of a power converter at the consumer premises on the consumer side of the PCC to control a noise contribution of the load due to the harmonics as seen at the PCC from a grid side that is not the same side of the PCC as the load, based on harmonics identified in the energy signature for the load, to reduce noise introduced onto the power grid system from the load.
9. The control node of claim 8 , wherein the controller device is to adjust the energy output to control the noise contribution from the harmonics of the load further comprising to adjust a reactive power output component of the power converter from energy generated by a local energy source coupled to the consumer side of the PCC.
10. The control node of claim 8 , wherein the controller device is to adjust the energy output to control the noise contribution from the harmonics of the load further comprising to adjust a reactive current component delivered to the load, to create a reactive current that offsets the harmonics identified in the energy signature for the load.
11. The control node of claim 8 , wherein the controller device is adjust the energy output to control the noise contribution from the harmonics of the load further comprising to reduce a frequency of an operating voltage of the load.
12. The control node of claim 8 , wherein the controller device is to further send information about current drawn by the load to a control device on the power grid system that is on the grid side of the PCC.
13. The control node of claim 12 , wherein the controller device is to send the information about the current drawn by the load to a grid controller.
14. The control node of claim 12 , wherein the controller device is to send the information about the current drawn by the load to a different control node of the power grid system.
15. A power grid system, comprising:
multiple loads electrically coupled to a consumer side of a point of common coupling (PCC) at a consumer premises; and
a control node coupled to the multiple loads at the PCC, the control node including
a metering device located on the consumer side of the PCC to the power grid system as the loads, the metering device to measure current drawn by at least one of the loads, to compute an angular displacement of harmonics, which include harmonic components of the current, relative to a primary current, which is a main energy component of the current, and to generate an energy signature unique to the at least one load including recording of a complex current vector for the load in operation identifying for the primary current a real power component and a reactive power component, and identification of a real power component, a reactive power component, and an angular displacement relative to the primary current for the harmonics; and
a power converter to adjust an energy output of a power converter at the consumer premises on the consumer side of the PCC to control a noise contribution of the at least one load due to the harmonics as seen at the PCC from a grid side that is not the same side of the PCC as the load, based on harmonics identified in the energy signature for the load, to reduce noise introduced onto the power grid system from the load.
16. The power grid system of claim 15 , wherein the power converter is to adjust the energy output to control the noise contribution from the harmonics of the load further comprising to adjust a reactive power output component of the power converter from energy generated by a local energy source coupled to the consumer side of the PCC.
17. The power grid system of claim 15 , wherein the power converter is to adjust the energy output to control the noise contribution from the harmonics of the load further comprising to adjust a reactive current component delivered to the load, to create a reactive current that offsets the harmonics identified in the energy signature for the load.
18. The power grid system of claim 15 , wherein the power converter is to adjust the energy output to control the noise contribution from the harmonics of the load further comprising to reduce a frequency of an operating voltage of the load.
19. The power grid system of claim 15 , wherein the metering device is to send the information about the current drawn by the load to a different control node of the power grid system.