Abstract: A modular energy storage system includes a housing, a plurality of energy storage devices, a first door assembly and a second door assembly. The housing includes a first end and a second end. The plurality of energy storage devices are coupled within the housing. The first door assembly is pivotally coupled to the first end of the housing. The second door assembly is pivotally coupled to the first end of the housing adjacent the first door assembly. The first and second door assemblies each comprise an air distribution member configured to distribute and direct a cooling air flow toward the plurality of energy storage devices to absorb heat energy from the plurality of energy storage devices.

Abstract: A system includes an energy storage system configured to supply energy to an electrical grid and a control system coupled to an energy management system of the electrical grid and configured to control the energy storage system. The control system receives one or more commands from the energy management system, and in response, executes a command compliance routine to charge or discharge energy from the energy storage system to the electric grid in accordance with the one or more commands. The control system also receives one or more system condition values from the energy storage system and one or more market condition values for the electric grid and executes a management routine to charge or discharge energy from the energy storage system to the electric grid based on the system condition values and the market condition values.

Abstract: A power delivery rate from a renewable power source to a load is managed by determining, by processing circuitry, a change in a power generation rate, determining, by the processing circuitry, whether the change in the power generation rate exceeds a limit, and then, adjusting, by control circuitry, a power transfer rate to or from a power storage device, such that the adjusting is sufficient to prevent the power delivery rate from exceeding the limit.

Abstract: Methods and systems for controlling power conversion systems. In one aspect, a power management system includes a first power conversion system coupled to a first energy source and a second power conversion system coupled to a second energy source, and a control system. The control system causes, while the first power conversion system is operating in an active mode and the second power conversion system is operating in a standby mode, the second power conversion system to exit the standby mode, the second power conversion system providing a reactive power flow upon exiting the standby mode. The control system causes the first power conversion system to provide a compensatory reactive power flow to compensate for at least a portion of the reactive power flow from the second power conversion system.

Abstract: A control system for an energy storage device is coupled to sensors on an electrical grid. The control system is configured to receive a measurement from each of the sensors. The control system determines, based on the received measurements, whether a grid event is a local event or a distributed event. The control system selects a response mode for controlling the energy storage device based on whether the grid event is determined to be a local event or a distributed event.

Abstract: A power management system includes an energy storage device and a control system coupled to the energy storage device. The control system is configured to execute a control routine to determine whether to charge or discharge the energy storage device using a target state of charge and a current state of charge of the energy storage device. The control system is configured to determine that an output signal, received from a power generator, is outside of a specified range. The control system is configured to modify the target state of charge of the energy storage device in response to determining that the output signal is outside of the specified range.

Abstract: A battery power transfer system includes control circuitry coupled to a charge/discharge module. The charge/discharge module is configured to apply an electrical stimulus to a battery and to determine, based at least in part on a measured response of the battery to the applied electrical stimulus, a target power transfer frequency of the battery. The power is transferred to or from the battery with a power transfer profile comprising current pulses having a frequency component selected based on the determined target power transfer frequency.

Abstract: A power delivery rate from a renewable power source to a load is managed by determining, by processing circuitry, a change in a power generation rate, determining, by the processing circuitry, whether the change in the power generation rate exceeds a limit, and then, adjusting, by control circuitry, a power transfer rate to or from a power storage device, such that the adjusting is sufficient to prevent the power delivery rate from exceeding the limit.

Abstract: Discharging a battery is accomplished by: applying an electrical stimulus to the battery; measuring a response to the electrical stimulus, the measured response providing an indication of discharge efficiency of the battery; determining a target frequency corresponding to a maximum discharge efficiency; and then discharging the battery with a discharge current profile comprising current pulses having a frequency component selected based on the determined target frequency.