General Electric Company

Joshua Webb

Kenneth McClellan Rush

Richard Hayes Cutright

Robert August Kaucic

Patrick Osae Djan-Sampson

David James

Richard Scott Bourgeois

Charles Clarence Hicks, Jr

Mark Edward Gotobed

Lukas Mercer Hansen

Michael Stanley Zanoni

Luca Tonini

David Alan Gutenmann

Kenneth Rush McClellan, Jr

Thomas Joseph Horgan

Controlling an energy storage system includes accessing monitored sensor data and component data, if the DC bus voltage is less than the renewable energy power module (REPM) output voltage then selecting battery modules in combination with a power-network inverter to source power to the bus, else if greater than the REPM voltage then selecting battery modules in combination with the inverter to sink power from the bus, instructing respective control processors of the selected battery modules and a control processor of the inverter to either source/sink power respectively to/from the DC bus, accessing updated DC bus voltage and updated REPM output voltage, and if the DC bus voltage and the REPM output voltage are about equal, then periodically accessing sensor data and component data, else reselecting and reinstructing the battery modules in combination with the inverter. A system for implementing the method and a non-transitory computer-readable medium are also disclosed.

Maximum power point tracking hybrid control of an energy storage system

Systems and methods for controlling an energy storage system are provided. In one embodiment, a method for controlling an energy storage system includes receiving a power demand associated with a grid service operation for an energy storage system and accessing data indicative of a time shift for responding to the power demand. The method includes implementing the time shift in the power demand to obtain a time shifted power demand; and controlling the charge or discharge of one or more energy storage devices in the energy storage system based at least in part on the time shifted power demand.

State of charge maintenance during operation of energy storage systems

The present disclosure is directed to a system and method for controlling an energy storage system. The energy storage system includes a plurality of parallel-connected energy storage devices. The method includes determining, by one or more controllers, a limiting energy storage device based at least in part on a current rating for the limiting energy storage device. The method includes determining, by the one or more controllers, an adjusted allowable system current based at least in part on modifying one or more operational parameters of the limiting energy storage device. The method includes determining, by the one or more controllers, a modified operational parameter of the limiting energy storage device to increase the allowable system current of the energy storage system. The method includes controlling the limiting energy storage device based at least in part on the modified operational parameter.

System and method for increasing allowable system current in energy storage system

The present disclosure is directed to a system and method for controlling an energy storage system. The energy storage system includes a plurality of battery strings connected in parallel with the battery strings having a plurality of batteries connected in series. The method includes determining, via a controller, one or more operating parameters of the energy storage system. The method also includes determining, via the controller, a maximum current rating of one or more of the battery strings. Another step includes estimating, via the controller, a voltage range for the one or more battery strings as a function of the one or more operating parameters and the maximum current rating. The method also includes dynamically controlling the one or more battery strings based on the voltage range so as to prevent over-current recharge or discharge of the parallel battery strings.

System and method for protecting energy storage systems from overcurrent conditions

Systems and methods for controlling power distribution are provided. The method includes receiving a power command, wherein the power command requests a discharge from one or more BESS units, and wherein the one or more BESS units are housed in one or more temperature controlled rooms. For each of the one or more temperature controlled rooms, a lowest energy remaining of the one or more BESS units in the temperature controlled room is determined; a low threshold is determined based on the determined lowest energy remaining and a floor; a limit is determined based on the determined low threshold; and the limit is assigned to each of the one or more BESS units housed in the temperature controlled room. The method includes causing the power command to be at least partially satisfied by the one or more BESS units based on the assigned limits.

Distribution of power commands in an energy storage system

Systems and methods for controlling the temperature of an energy storage system are provided. More specifically, a time period of increased battery temperature attributable to, for instance, charging or discharging of the battery can be identified. A control system can be used to reduce the ambient temperature of a space associated with the battery energy storage devices in the time period prior to or immediately before the period of increased battery temperature. The ambient temperature can be maintained at a nominal ambient temperature at other times.

Cooling for battery units in energy storage system

In one aspect, a method of performing a passive maintenance operation on an energy storage farm may generally include receiving data associated with a maintenance schedule for each energy storage system in the plurality of energy storage systems, identifying at least one energy storage system as a charge contributor based at least in part on the data associated with the maintenance schedule, identifying at least one energy storage system as a discharge contributor based at least in part on the data associated with the maintenance schedule, and controlling the operation of the energy storage farm such that power distribution in the energy storage farm is biased so as to increase the state of charge of the charge contributor(s) prior to increasing the state of charge of the discharge contributor(s).

Performing passive maintenance on an energy storage farm

Systems and methods for controlling an energy storage system to provide for delivery of multiple grid services are provided. Grid service requests can be categorized into a plurality of priority tiers. Power demands associated with the grid service requests can be allocated to enforce the prioritization scheme of the priority tiers. For instance, power demands associated with grid service requests in higher priority tiers can be given preference over power demands associated with grid service requests in lower priority tiers. Multiple grid service requests can be categorized within the same priority tier. In addition, the energy storage system can be controlled not only give priority to grid services requests categorized in the higher priority tiers, but also to manage the state of charge of the system to ensure that there is sufficient reserve capacity to meet power demands of the grid service requests categorized in the higher priority tiers.

Delivery of multiple grid services with energy storage system

In one aspect, a method of distributing power among a plurality of energy storage systems in an energy storage farm may generally include receiving a power distribution input associated with a power amount to be received by or delivered from the energy storage farm, determining an initial power value for each energy storage system based at least in part on a state of charge associated with the energy storage system, determining an unallocated power value for the energy storage farm based at least in part on the received power request and the initial power values of the energy storage systems, determining an updated power value for each energy storage system based at least in part on the unallocated power value, and controlling the operation of the energy storage farm such that each energy storage system delivers or receives an amount of power equal to its determined updated power value.

Growing community of inventors

Schenectady, NY, United States of America

Joshua Webb