A method of controlling a plurality of power units (106a to 106n) in a power distribution network (PDN) is provided. The method comprising: a) receiving a first parameter indicative of the inertia of the PDN; b) determining, based on at least the first parameter, a proportion of the power units to allocate to a reserve and/or charging state; and c) instructing, based on the determination, one or more of the plurality of power units to enter a reserve and/or charging mode in order that the determined proportion of the power units is allocated to the reserve and/or charging state.

An energy supply system and electrical outlet are provided. An energy supply system includes an electrical power source connected to an inverter device for forming a local power grid. The electrical outlet includes frequency measuring means for measuring the frequency of the electrical power feed into said local power grid by said inverter device and power control means for controlling said electrical power provided to a load by said electrical outlet dependent on the measured frequency.

An uninterruptible power supply (UPS) is operated to selectively provide energy to a critical load from a grid and an energy storage device and to transfer energy between the energy storage device and the grid. A controller causes the UPS to selectively support bidirectional and unidirectional transfers of energy between the grid and the energy storage device based on a state of charge (SOC) of the energy storage device.

A central plant includes storage devices configured to store resources purchased from a utility or generated by the central plant and to discharge the one or more resources. The central plant includes a controller configured to obtain a cost function comprising a peak load contribution (PLC) term representing a cost based on an amount of the one or more resources purchased during coincidental peak (CP) subperiods. The controller is configured to modify the cost function by applying a peak subperiods mask to the PLC term, wherein, for each subperiod, the peak subperiods mask modifies a portion of the PLC term corresponding to the subperiod based on a probability that the subperiod will be one of the CP subperiods. The controller is also configured to perform an optimization of the modified cost function.

A system and method for controlling power flow in a hybrid power system includes a controller in communication with the hybrid power system. The controller is also in communication with at least one knowledge system to receive information related to power generation or power consumption within the hybrid power system. The controller generates a control command for each of the power converters in the hybrid power system and maintains a log of power flow to and from each device in the hybrid power system. The controller is also in communication with a provider of the utility grid and may generate the control commands for each of the power converters in response to commands provided from the provider of the utility grid.

A system includes a control unit having one or more processors and a communication interface. The communication interface is configured to communicate with one or more charging stations that are electrically coupled to receive electrical power from a power distribution grid and that are configured to selectively charge one or more energy storage devices connected to the charging stations. The one or more processors are configured to generate first control signals for communication by the communication interface to the one or more charging stations to control transfer of reactive and/or active power from the charging stations to the power distribution grid. The control signals are generated based at least in part on a load cycle profile of one or more electric machines electrically coupled to the power distribution grid.

Provided is a microgrid system having: a plurality of distributed power sources; a plurality of distributed loads; and lines for connecting the distributed power sources and the distributed loads, the microgrid system including: an ESS for storing power supplied from all or a portion of the distributed power sources and supplying the stored power to all or a portion of the distributed loads; an ESS PCS including an interruption means for converting the power stored in the ESS into AC power suitable for the microgrid and supplying the AC power to the microgrid in order to block connection to the microgrid in an abnormal state; and a monitoring/control device for gradually increasing a voltage output from the ESS PCS and performing processing for the failure when a failure is detected in the microgrid.

A method (3600) and system (2800, 2900, 3000, 3100) autonomously create a restore point for a luminaire controller (2810, 3110) and restore it to proper operation when required. The luminaire controller operates by using first operating software having a first software image, and receives a second software image of second operating software. The luminaire controller communicates the first software image to a first device (2820, 3120) connected to the luminaire controller via a communication network (2805, 3105), installs the second operating software, and performs a self test of the luminaire controller. If the luminaire controller fails the self test, the luminaire controller requests via the network that the first device transfer the first software image to the luminaire controller via the network, receives the first software image, installs the first operating software, and reverts to operation with the first operating software.

A power device includes an input configured to receive input power from a power source, power circuitry, a power output, a network module, and a controller. The controller is configured to operate the power circuitry to provide output power to the power output derived from the input power and to communicate with at least one primary server via the network module. In response to a determination that communication with the primary server has failed, the controller is configured to attempt communication with a domain name server. In response to a determination that communication with the domain name server has failed, the controller is configured to identify that the network has failed.

The present invention relates to a motor control center system comprising an integrated module which is connected to multiple protection control modules through a first serial communication network and is connected to multiple LOP controllers through a second serial communication network, and communicates with a computer or a PLC in a main control room, wherein i) operation command transmission between the LOP controllers and the protection control modules and ii) measured-data collection, operational-state reporting, or control command transmission between the main control room or the PLC and the protection control modules are performed while the integrated module commonly intervenes therebetween; and commonly use the first serial communication network.