A power system stabilization method includes: receiving a power command value from a power control center that monitors a power system; transmitting the power command value to a power supply device; causing the power supply device to supply power to the power system according to the power command value; generating a prediction command value according to past power command values received from the power control center, the prediction command value being a prediction value of a power command value to be transmitted from the power control center next after the power command value; transmitting the prediction command value to a power supply device; causing the power supply device to supply power to the power system according to the power prediction command value; receiving the next power command value from the power control center; transmitting the next power command value to the power supply device.

An integrated renewable energy source (RES) and energy storage system (ESS) facility configured to supply power to an AC electrical grid includes energy storage system capacity and inverter capacity that are larger than a point of grid interconnect (POGI) limit for the facility, enabling high capacity factors and production profiles that match a desired load. At least one first DC-AC power inverter is associated with RES, and at least one second AC-DC power inverter is associated with the ESS. AC-DC conversion is used when charging the ESS with RES AC electric power, and DC-AC conversion utility is used when discharging ESS AC electric power to the electric grid. Aggregate DC-AC inverter utility exceeds the facility POGI limit, and excess RES AC electric power may be diverted to the second inverter(s).

A power storage management system, a power storage apparatus, a power storage management method are provided. The power storage management system includes a receiver part, a sender identifying part, a memory part and a deterioration degree estimating part. The sender identifying part identifies an external apparatus that transmitted a control signal received by the receiver part. The memory part stores apparatus information related to the external apparatus identified by the sender identifying part and power storage status information related to the status change of the power storage apparatus caused by charging or discharging performed according to the control signal transmitted from the external apparatus. The deterioration degree estimating part estimates the deterioration degree of the power storage apparatus to which a charge/discharge control is performed according to the control signal transmitted from the sender apparatus based on the apparatus information and the power storage status information.

Provided are a power storage control apparatus and a power storage control method with which a second power storage apparatus connected to a first storage apparatus via a power distribution network can be used based on an availability status of the first power storage apparatus under a configuration that a plurality of power storage apparatuses are deployed in the power distribution network. The power storage control apparatus includes a status determination part, a signal generation part and a communication part. The status control part determines the availability status of the first power storage apparatus deployed in the power distribution network. The signal generation part generates a control signal for using the second power storage apparatus connected to the first storage apparatus in the power distribution network instead of the first power storage apparatus based on a determination result from the status determination part. The communication part transmits the control signal generated by the signal generation part to the second power storage apparatus.

A controller in an electricity storage system that includes a first DC/DC converter connected to a storage battery, and a bidirectional inverter connected to the first DC/DC converter. The controller includes a control circuit which changes a content to be displayed by a display, according to whether the electricity storage system is in a predetermined state in which a first PV is connected to the bidirectional inverter via a DC bus.

The present invention allows the realization of sufficient control precision and control reliability when using a power supply/demand adjustment device group. A control device (A) that controls power supply/demand adjustment devices includes a communication unit (A1) that receives operation control information of the power supply/demand adjustment devices and a control unit (A2) that executes operation control of the power supply/demand adjustment devices on the basis of the operation control information received by the communication unit. There is a difference, in at least one of the intervals from among the interval for receiving the operation control information and the interval for executing the operation control, between the control device that controls power supply/demand adjustment devices and other control devices that are in different states.

A power output control and compensation (PCC) circuit operates within a distributed energy resource (DER) system. The PCC circuit is located in a battery power conversion system (PCS) and includes an input terminal to connect with a power source and an output terminal to connect with an electrical panel or load. A current sensing device is coupled between the input and the output terminals to measure a power level of the power source. A relay is coupled between the current sensing device and the output terminal and a processor selectively connects power from the power source to the electrical panel or the load based on the measured power level or based on other power measurements within the DER system. PCS-control of multiple power sources decreases cycle times for controlling distributed energy resources.

A microgrid is re-synchronized to a main grid or substation by determining a degree of bus angle or frequency mismatch and bus voltage mismatch between the microgrid and the main grid or substation prior to re-synchronization, determining an amount of power adjustment needed to reduce the bus angle or frequency mismatch and bus voltage mismatch to below respective predetermined thresholds, determining at least one participation factor for each microgrid bus, each participation factor indicating an amount of influence power injection by the corresponding bus has on the bus angle or frequency mismatch or on the voltage mismatch, allocating the amount of power adjustment to the microgrid buses in proportion to the participation factors assigned to the buses, and re-synchronizing the microgrid to the main grid or substation responsive to the bus angle or frequency mismatch and bus voltage mismatch satisfying the respective predetermined thresholds.

Disclosed herein are representative embodiments of methods, apparatus, and systems for charging and discharging an energy storage device connected to an electrical power distribution system. In one exemplary embodiment, a controller monitors electrical characteristics of an electrical power distribution system and provides an output to a bi-directional charger causing the charger to charge or discharge an energy storage device (e.g., a battery in a plug-in hybrid electric vehicle (PHEV)).

The controller can help stabilize the electrical power distribution system by increasing the charging rate when there is excess power in the electrical power distribution system (e.g., when the frequency of an AC power grid exceeds an average value), or by discharging power from the energy storage device to stabilize the grid when there is a shortage of power in the electrical power distribution system (e.g., when the frequency of an AC power grid is below an average value).

When executing adjustment processing in the power supply/demand adjustment processing of a DR (demand response) system, the present invention can prevents the selection, as a power supply/demand adjustment device to be used (device to be used), of a power supply/demand adjustment device that does not satisfy the characteristics of the adjustment processing. This control device (A) is provided with: an acquisition unit (A1) that acquires information that relates to power supply/demand adjustment devices and that is indicated for each power supply/demand adjustment device and information indicating characteristics of the power supply/demand adjustment processing; and a reporting unit (A2) that, on the basis of the information that relates to the power supply/demand adjustment devices and information that indicates characteristics of the power supply/demand adjustment processing, reports an actuation of the power supply/demand adjustment processing to power supply/demand adjustment devices that are to be used for the power supply/demand adjustment processing.