A system includes a load balancing unit configured to distribute power from a plurality of AC power sources to a plurality of loads. The system further includes a monitoring unit configured to monitor an energy consumption from each AC power source and a power consumption of each load. The system further includes a user interface configured to receive a user preference. The system also includes a controller configured to determine a QoS parameter for each AC power source and regulate, by the load balancing unit, the distribution of power from the plurality of AC power sources to the plurality of loads based on the energy consumption from each AC power source, a power rating of each load, the QoS parameter of each AC power source, a tariff rate of each AC power source and the user preference.

Methods and Systems for dynamic state estimation (DSE) in an electric power system (EPS) having a multi-control area interconnected power network. Estimating current states of buses in a control area using historical data via a state transition model of buses of the control area. Receiving, a current state of 1-hop and n-hop neighboring buses located in neighboring control areas. A 1-hop neighboring bus connects to one boarder bus of the control area via a tie-branch and n-hop neighboring bus is connected to the 1-hop neighboring bus via at least one tie-branch, wherein n is greater than one. Determining measurements of states from buses in the control area. Finally, updating the current state of the buses using a measurement model on a basis of estimated current states of the control area, the received states from the neighboring control areas, and the measurements of states from buses in the control area.

Methods and Systems for dynamic state estimation (DSE) in an electric power system (EPS) having a multi-control area interconnected power network. Estimating current states of buses in a control area using historical data via a state transition model of buses of the control area. Receiving, a current state of 1-hop and n-hop neighboring buses located in neighboring control areas. A 1-hop neighboring bus connects to one boarder bus of the control area via a tie-branch and n-hop neighboring bus is connected to the 1-hop neighboring bus via at least one tie-branch, wherein n is greater than one. Determining measurements of states from buses in the control area. Finally, updating the current state of the buses using a measurement model on a basis of estimated current states of the control area, the received states from the neighboring control areas, and the measurements of states from buses in the control area.

Disclosed are a voltage source converter based high voltage direct current (VSC-HVDC) high-frequency resonance suppression method, system, and device. The method includes: when an effective value of an actually input alternating current (AC) voltage is reduced from a normal value to meet a preset condition, making the virtual electrical quantity completely equal to the actual electrical quantity, and performing full real-time tracking for the actual electrical quantity to improve dynamic characteristics of a power system at the moment of a fault; and after performing the full tracking for a period of time, if the effective value of the actual AC voltage is less than a preset threshold, performing adaptive tracking until the actual electrical quantity recovers to a stable value. The present disclosure can reduce a risk of high-frequency resonance of a VSC-HVDC, avoid deteriorating dynamic characteristics of the VSC-HVDC, and improve safety of fault ride-through of the VSC-HVDC.

Disclosed are a voltage source converter based high voltage direct current (VSC-HVDC) high-frequency resonance suppression method, system, and device. The method includes: when an effective value of an actually input alternating current (AC) voltage is reduced from a normal value to meet a preset condition, making the virtual electrical quantity completely equal to the actual electrical quantity, and performing full real-time tracking for the actual electrical quantity to improve dynamic characteristics of a power system at the moment of a fault; and after performing the full tracking for a period of time, if the effective value of the actual AC voltage is less than a preset threshold, performing adaptive tracking until the actual electrical quantity recovers to a stable value. The present disclosure can reduce a risk of high-frequency resonance of a VSC-HVDC, avoid deteriorating dynamic characteristics of the VSC-HVDC, and improve safety of fault ride-through of the VSC-HVDC.

An electricity backfeed protection assembly is beneficially installed between a main circuit breaker panel of a structure or dwelling, and a utility meter measuring electricity delivered to the structure or dwelling by a utility provider or other primary power source. The electricity backfeed protection assembly includes a contactor having a coil. A contact protector device is electrically connected to the coil of the contactor. The electrical backfeed protection assembly automatically prevents electricity from a secondary power source (including, without limitation, a portable generator) from backfeeding into supply lines of a primary power source (such as utility lines or equipment).

A control apparatus that controls power consumption in a service providing system configured to provide a service using servers provided, respectively, in a plurality of bases placed in a geographically dispersed manner, the apparatus including: a target power setting unit configured to set target power values of the respective bases based on requests for increases/decreases in power consumption in the bases equipped with the servers; and a load balance setting unit configured to perform load transfer among a plurality of servers based on the target power values.

A control apparatus that controls power consumption in a service providing system configured to provide a service using servers provided, respectively, in a plurality of bases placed in a geographically dispersed manner, the apparatus including: a target power setting unit configured to set target power values of the respective bases based on requests for increases/decreases in power consumption in the bases equipped with the servers; and a load balance setting unit configured to perform load transfer among a plurality of servers based on the target power values.

A method is provided for controlling electrical load on a power grid from a load facility using demand response. The method includes accessing memory storing computer-readable program code for decision analysis of a specified time interval for a demand-response (DR) event. The method also includes executing the computer-readable program code, via a processor, to cause an apparatus to at least make a decision to participate in or opt out of the DR event. This includes the apparatus receiving values of variables that describe occupancy and usage of the load facility for one or more time intervals. The apparatus applies the values to an algorithm that maps the variables to a decision to participate in or opt out of the DR event for the specified time interval. And the apparatus automatically notifies an operator responsible for the DR event of the decision at least when the decision is to opt out.

A method is provided for controlling electrical load on a power grid from a load facility using demand response. The method includes accessing memory storing computer-readable program code for decision analysis of a specified time interval for a demand-response (DR) event. The method also includes executing the computer-readable program code, via a processor, to cause an apparatus to at least make a decision to participate in or opt out of the DR event. This includes the apparatus receiving values of variables that describe occupancy and usage of the load facility for one or more time intervals. The apparatus applies the values to an algorithm that maps the variables to a decision to participate in or opt out of the DR event for the specified time interval. And the apparatus automatically notifies an operator responsible for the DR event of the decision at least when the decision is to opt out.