Control system for dispatching optimized real and reactive power set points
A control system is provided for controlling multiple power sources of a power system. The control system calculates real and reactive power set points for each of the power sources utilizing: (1) a feedforward power compensation function that provides optimized site level set points; (2) a real power set point derivation scheme in which the real power set points are selected based on the energy capacity of the energy storage devices; (3) a state of charge (SOC) balancing scheme that substantially balances the state of charge of the energy storage devices; (4) a remainder function to account for real-time limits imposed by the equipment; and/or (5) a reactive power set point derivation scheme in which the reactive power set points are selected to minimize the total apparent power across the power sources.
1 . A power system, comprising:
a plurality of power sources for supplying power to or absorbing power from an AC load, wherein each of the power sources comprises a power conversion system associated with one or more energy storage devices; and
a control system configured to individually control each of the power sources by:
calculating a nominal real power set point for each of the power sources, wherein the nominal real power set point is calculated based on a maximum energy capacity of the one or more energy storage devices of the power source, a state of health associated with each of the one or more energy storage devices, and a total energy capacity of available energy storage devices within the power system; and
dispatching a real power demand based on the nominal real power set point to each of the power sources.
2 . The power system of claim 1 , wherein the control system is configured to adjust the nominal real power set point via application of one or more of (a) a state of charge balancer, (b) a power limiting function, and (c) a remainder function.
3 . The power system of claim 2 , wherein the state of charge balancer is configured to substantially balance the state of charge of available energy storage devices within the power system.
4 . The power system of claim 2 , wherein the power limiting function is configured to limit the nominal real power set point of one or more of the power sources based on a maximum real power limit of each of the one or more power sources.
5 . The power system of claim 2 , wherein the remainder function is configured to redistribute a total deviation in real power set points attributable to the power limiting function to a plurality of the power sources.
6 . A power system, comprising:
a plurality of power sources for supplying power to an AC load, wherein each of the power sources comprises a power conversion system associated with one or more energy storage devices; and
a control system configured to control each of the power sources by:
calculating a nominal real power set point for the power source based on a state of health associated with each of the one or more energy storage devices;
calculating a state of charge balance factor for the power source;
adjusting the nominal real power set point based on the state of charge balance factor to determine an adjusted real power set point; and
dispatching a real power demand based on the adjusted real power set point to the power source.
7 . The power system of claim 6 , wherein the nominal real power set point is calculated based on an energy capacity of the one or more energy storage devices of the power source and a total energy capacity of available energy storage devices within the power system.
8 . The power system of claim 6 , wherein the state of charge balance factor is determined by a state of charge balancer configured to substantially balance the state of charge of available energy storage devices within the power system.
9 . The power system of claim 8 , wherein the state of charge balance factor is calculated based on a trim factor that indicates an aggression level for balancing the state of charge of available energy storage devices within the power system.
10 . The power system of claim 6 , wherein the state of charge balance factor is calculated based on a current state of charge of the one or more energy storage devices of the power source.
11 . The power system of claim 10 , wherein the state of charge balance factor is calculated based on (i) if the one or more energy storage devices of the power source are charging, a maximum allowable state of charge of the one or more energy storage devices or (ii) if the one or more energy storage devices of the power source are discharging, a minimum allowable state of charge of the one or more energy storage devices.
12 . The power system of claim 11 , wherein the state of charge balance factor is calculated based on a current state of health of the one or more energy storage devices of the power source.
13 . The power system of claim 6 , wherein the control system is further configured to adjust the nominal real power set point via application of one or more of (a) a power limiting function and (b) a remainder function.
14 . The power system of claim 13 , wherein the power limiting function is configured to limit the adjusted real power set point of one or more of the power sources based on a maximum real power limit of each of the one or more power sources.
15 . The power system of claim 13 , wherein the remainder function is configured to redistribute a total deviation in real power set points attributable to the power limiting function to a plurality of the power sources.
16 . The power system of claim 6 , wherein the control system is further configured to control each of the power sources by:
calculating a nominal reactive power set point for the power source; and
dispatching a reactive power demand based on the nominal reactive power set point to the power source.
17 . The power system of claim 16 , wherein the nominal reactive power set point is calculated based on a reactive power limit for the power source and a total reactive power limit for available power sources within the power system.
18 . The power system of claim 16 , wherein the control system is configured to adjust the nominal reactive power set point via application of one or more of (a) a power limiting function and (b) a remainder function.
19 . The power system of claim 18 , wherein the power limiting function is configured to limit the adjusted reactive power set point of one or more of the power sources based on a maximum reactive power limit of each of the one or more power sources.
20 . The power system of claim 18 , wherein the remainder function is configured to redistribute a total deviation in reactive power set points attributable to the power limiting function to a plurality of the power sources.