An electrical power generating system for providing auxiliary or backup power to a load bus. The system may be used indoors, and generally includes a fuel cell unit comprising a first DC output, an electrical storage unit comprising a DC input coupled to the first DC output of the fuel cell, the electrical storage unit further comprising a second DC output. An inverter coupled to the second DC output receives power, the inverter comprising a first AC output. The system includes a contactor connected between the first AC output and an AC load bus. The AC load bus comprises an AC voltage, and a controller comprising inputs is adapted to sense a phase, a frequency, and a magnitude of the first AC output and the AC voltage and close the contactor when they substantially match.

Distributed grid intelligence can enable a virtual power grid. Multiple consumer nodes can have local power sources, and be coupled to a same point of common coupling (PCC). The consumer nodes can be controlled by distributed control nodes at the consumer nodes. The control nodes control the distribution of power from the local power sources based on local power demand of each respective consumer node, and also based on distribution of power from the other respective control node. Thus, consumer nodes can share power generated locally, but operate independently without the need for central management or a central power plant.

Technologies are generally described for addressing the bidirectional power flow conflict incurred by power surpluses produced from a number of households' on-location energy generation units (e.g., solar) in power distribution networks. A micro grid composed of households in a neighborhood may be considered as a generating- or consuming-resource entity at different time periods. The approach may be formulated as a power balance computation such that power balance may not be achieved within the micro grid itself, and therefore power sharing (or redispatching) among micro grids is operated, before requesting power from the macro grid, i.e., the fuel-based conventional grid. Enhancement of renewable energy utilization and reduction in the amount of data packet traffic in exchange of information and control messages via uplink and downlink transmissions throughout an overlay multi-tier communications network infrastructure may be taken into consideration in example implementations.

A system stabilizing controller for estimating and controlling stability of a power grid includes a collection unit collecting grid information including a power flow amount from the power grid and a calculation unit calculating a generator shedding amount at a fault observation point on the basis of the grid information and estimating a correlation line on the basis of the power flow amount and generator shedding amount. The calculation unit determines a generator phase angle curve that is the relationship between the internal generator phase angle of a generator connected to the power grid and the power flow amount, determines a stability limit power flow amount on the basis of the amounts of generator acceleration energy and deceleration energy in the generator phase angle curve, determines a stability limit generator shedding amount corresponding to the stability limit power flow amount, and estimates a correlation line including a stability limit point.

A plurality of storage battery modules include storage battery control devices that can mutually communicate with each other and obtain a demand for electric power in a predetermined consumer in which the plurality of storage battery modules are provided. The storage battery control devices mutually transmit and receive charging/discharging electric power of the storage batteries and control charging/discharging of the plurality of storage battery modules, respectively, on the basis of the demand for electric power in the predetermined consumer.

When some failure occurs in the case where power interchange is performed among grids, an alternate route is searched at high speed in consideration of a deficiency/excess amount of power. A power network system has a plurality of power routers (1-7), power transmission lines (100-111) connecting the power routers, a controller (8), a communication network (10), and communication lines (11). The controller (8) obtains a reception electric energy and a transmission electric energy in the power routers (1-7), detects a failure due to a fault in, for example, the power router (4), and searches for an alternate route to solve deficiency/excess power caused by the failure occurrence. Concretely, an alternate route is searched while following a power router having excessive power as a root node by a breadth first search, and transmitting the deficiency/excess power and an allowable power transmission capacity in each of the power routers to an adjacent power router. A control instruction related to interchange power is output via the alternate route.

The present invention monitors an electric power system using a time-series measurement value including abnormality. An electric power system monitoring device is provided with: a storage unit that stores facility information indicating a position relationship of a plurality of measurement sites in an electric power system; a reception unit that receives time-series measurement information measured by a measurement device disposed at each of the plurality of measurement sites; and a computation unit that acquires an electrical distance between the plurality of measurement sites on the basis of the facility information, classifies the plurality of measurement sites into at least one measurement site group on the basis of the electrical distance, extracts, with respect to each of the measurement sites in the measurement site group, a frequency component of electric power fluctuation from the measurement information, selects, with respect to a first frequency component which is a frequency component of a first measurement site in the measurement site group, a second frequency component which is a frequency component of a second measurement site in the measurement site group, and calculates a similarity between the first frequency component and the second frequency component.

A device for monitoring the properties of an electrical grid including an electrical connector for coupling to the electrical grid through a wall socket, a detector for detecting at least one property of electricity provided by the electrical grid, a receiver for receiving clock signals, and a sampler for sampling a respective detected property and recording sampled values in a memory, wherein the variation of the values with time represents a waveform of the respective property and the sampler samples at a rate sufficient to record variations of the property within a period of the waveform, wherein the device associates at least a portion of the sampled values with at least one clock signal.

A device and method are provided for monitoring quality and performance parameters of an electricity distribution component in an electricity distribution network and detecting any deviation of operating parameters from the specified regulatory set and enforced limits. The critical and increasing problem is mitigated for the myriad of private domestic and commercial DEG devices being installed and connected to the distribution networks which were not initially designed for, or even not anticipated with, the recent DEG evolution, and the increasing complex electrical components with changing loads and power factors across the distribution network.

A computer-implemented method is provided for managing a plurality of micro grids in an energy system. The method includes collecting and maintaining, in a central database, configuration information and state information for the plurality of micro grids, by a processor-based dynamic operation engine. The method further includes identifying failures in any of the plurality of micro grids and generating updated configuration information and updated state information relating to the failures, based on data analytics and diagnostic polling applied to the configuration information and the state information, by a processor-based micro grid diagnostic engine. The method also includes autonomously recovering from the failures in any of the plurality of microgrids using one or more backup devices determined based on the updated configuration information and the updated state information, by a processor-based system recovery engine operatively coupled to the processor-based dynamic operation engine and to the processor-based micro grid diagnostic engine.