A method for generating a net load forecast for a utility grid, the grid including intermittent distributed energy resources and loads, comprising: defining two or more load forecast zones, each zone being associated with a load profile type and a climate zone type; assigning each of the loads to one of the zones based on the load profile and climate zone types associated with the load; assigning each of the energy resources to at least one of the zones based on the climate zone type associated with the energy resource; for each zone, generating an electrical energy consumption forecast for loads, an electric power generation forecast for energy resources, and a net load forecast from the electrical energy consumption and electric power generation forecasts; combining the net load forecast for each zone to generate the net load forecast for the grid; and, presenting the net load forecast on a display.

A probe card includes a substrate module having an installation hole and a first stair-shaped structure provided on two stairs thereof with a first connection surface and a first transmission surface having a first contact pad, a probe module having a probe and a second stair-shaped structure provided on two stairs thereof with a second connection surface and a second transmission surface having a second contact pad electrically connected with the probe, and a pressing member. The probe module is disposed in the installation hole so that the first and second connection surfaces are connected and the first and second transmission surfaces are opposite. The pressing member is detachably pressed on the probe module to press the second connection surface against the first connection surface and make the first and second contact pads electrically connected.

An appliance includes an operation unit that is mounted in a case of the appliance that is supplied power by an external power supply and that includes at least one of a motor and a heating member. The appliance further includes a control circuit mounted in the case of the appliance and configured to control the operation unit to perform appliance functionality that is different than measuring power. The appliance further includes a power meter coupled to the control circuit, built into the case, and configured to measure power consumed by the appliance in performing the appliance functionality.

An appliance includes an operation unit that is mounted in a case of the appliance that is supplied power by an external power supply and that includes at least one of a motor and a heating member. The appliance further includes a control circuit mounted in the case of the appliance and configured to control the operation unit to perform appliance functionality that is different than measuring power. The appliance further includes a power meter coupled to the control circuit, built into the case, and configured to measure power consumed by the appliance in performing the appliance functionality.

An electricity meter includes at least one phase conductor and a neutral conductor, an internal cut-off device includes at least one phase cut-off member connected in series with the phase conductor, and at least one detector circuit for acting when the internal cut-off device is open to detect whether a circuit breaker of the installation is open or closed. The electricity meter includes coupling components connected, downstream from the internal cut-off device, to an injection conductor selected from the phase conductor and the neutral conductor, and an injection component arranged to apply a reference voltage to the injection conductor via the coupling capacitor; and connection components connected to a measurement conductor selected from the phase conductor and the neutral conductor, and a measurement component arranged to measure a measurement voltage across the terminals of one of the connection components, the measurement voltage being representative of an impedance of the installation.

Power grid system and method of determining power consumption at one or more building connections in a power grid system. The power grid system comprises a power grid comprising a mains grid portion; a plurality of building connections, each building connection comprising a first meter configured for metering power imported from the mains grid portion to the associated building and power exported from the associated building into the mains grid portion; for one or more of the building connections, at least one second meter disposed downstream from the first meter relative to the mains grid portion and configured for metering power exported to the associated building from an auxiliary generator; and a consolidation unit configured for determining power consumption at said one or more of the building connections based on readings from the associated first and second meters.

A voltage detecting device detects a differential voltage between two input nodes having a non-zero common mode voltage. A differential voltage detecting circuit 5 detects the differential voltage by sampling each voltage of the input nodes and outputs a detection voltage indicating a detection result. A leak canceling circuit generates a compensating current, which flows in opposition to a leak current flowing out from the input nodes in correspondence to an operation of the differential voltage detecting circuit. An operation control part controls the leak canceling circuit to perform or stop a canceling operation. A failure diagnosing part performs a failure diagnosis about the leak canceling circuit based on a first detection value and a second detection value of the detection voltages, which are detected during periods when the leak canceling circuit performs and stops the canceling operation.

A DSP-based electrical energy metering device is provided. After determining a current application mode, a DSP controller compares an execution rate of each computing task with a corresponding preset comparison value, and outputs a first condition value to a condition general register based on a comparison result, so as to control an execution rate of each computing task in the DSP controller. A jump condition controller outputs a second condition value corresponding to the current application mode to the condition general register based on a change in the execution rate of each computing task compared with an execution rate of the computing task in a previous application mode, so that all computing tasks are executed. An adaptive word length controller adjusts an effective bit width of the electrical signal read by a data general register from a data memory at execution rates of different computing tasks.

To provide an authentication technique having higher security between IoT devices and server devices or between IoT devices. The server device provides, to the terminal device, a parameter file including a predetermined identifier for uniquely identifying a relationship between the terminal device and the server device, and connection destination information regarding a connection destination of the server device, the terminal device accesses the server device specified by the connection destination information in the parameter file, requests issuance of a timed identification number, and transmits the identifier and the timed identification number to the server device when connecting to the server device specified by the connection destination information in the parameter file, and the server device authenticates the terminal device using the identifier, and confirms an authenticity of the terminal device using the timed identification number.

A system for autonomously validating the topology information of an electrical power distribution system is provided. For example, the system includes a group of meters previously determined to be connected to the same transformer of an electrical power distribution system. The group of meters is configured to perform family check periodically or upon request and to identify orphan meters in the group. The identified orphan meter can contact a community device communicatively connected to meters in more than one group to request a community check. The community device performs the community check by contacting meters in other groups of meters and obtain their family signature data. The community device further determines whether the orphan meter belongs to a new family based on the voltage data of the orphan meter and the family signature data of other groups. The orphan meter can report the community check results to a headend system.