A power control device for an electrolyzer that is configured to encode power curtailment information as a DC bus voltage level using a DC droop characteristic in first stage and decode the DC bus voltage to power information in a second stage.

A method for identification of a power supply source, a power supply system and a system having at least one load is disclosed. The at least one load receives power from the power supply system and makes measurements of the AC output signal of the power supply source. A supervisory device operatively coupled to the at least one load is disclosed. The supervisory device receives measurements from the at least one load and determines an identification of the power supply source of the power supply system by demodulating and decoding the received measurements.

The current disclosure provides methods and systems for intelligent load management in off-grid AC systems and provides methods and systems to control and prioritize loads, so that supply and demand can be balanced via an extremely robust and reliable system.

A method for protecting at least a part of a network segment of an electrical power distribution network has: detecting voltage dips at the intermediate feeding devices of the line arrangements by the voltage dip detection devices; generating and feeding an electrical signal into the line arrangement by the signal generating device at each intermediate feeding device at which one of the voltage dips is detected, the electrical signals having frequencies different from a network frequency of the network segment; receiving the electrical signals via the line arrangements by the receiving devices of the line protection devices; detecting electrical faults on the line arrangement using the electrical signals received by the triggering device of the respective line protection device; and triggering the disconnecting device of the line protection device of the line arrangement, where an electric fault is detected, by the triggering device so that the line arrangement is electrically disconnected from the further element.

The current disclosure provides methods and systems for intelligent load management in off-grid AC systems and provides methods and systems to control and prioritize loads, so that supply and demand can be balanced via an extremely robust and reliable system.

A method and system for bidirectional data, power transmission, electrical/electronic fault isolation, and system recovery is shown and described. An exemplary embodiment includes a DC power source, a main power controller (“MPC”) with a MPC microprocessor and an MPC power switcher driver and fault switching control circuit, and a plurality of Nodes connected to the DC power source through conductors that allow both power to be supplied and bidirectional data transfer between a data receiver and the plurality of Nodes. The fault switching control circuit can provide for short detection and isolation (or other fault detection and isolation) without the direct involvement of the MPC microcontroller. The combined use of the conductors for power, data transmission, and fault detection and isolation offers significant advantages over the prior art in terms of weight reduction, system modularity, and complexity, as well as system protection and survivability.

A current meter measures a current value associated with input power inputted to a code modulator. A code modulation circuit modulates the input power to generate a code-modulated wave by code modulation using a modulation code based on a code sequence, and transmits the code-modulated wave to the code demodulator via a transmission path. A control circuit controls the code modulation circuit. The code modulation circuit has operation modes different from each other depending on a direction of the input power, and a direction of the code-modulated wave to be generated. The control circuit generates waveform information indicating variations of direction of the input power over time, based on the current value measured by the current meter, and determines the operation mode of the code modulation circuit based on the waveform information.

Systems, devices, and methods include a controller and a power unit coupled to a load device. The controller receives an altered AC signal, the altered AC signal comprising delays within an AC signal during a downward portion of a positive half cycle of the AC signal, determines a message from the delays within the altered AC signal, determines an action to execute based on the message, determines whether the delays present within a portion of the altered AC signal include a rising type delay, in response to determining the presence of the rising type delay in the altered AC signal, causes the power unit to introduce voltage within the altered AC signal transforming the portion of the altered AC signal including the rising type delay into a conditioned power signal, and transmits the altered AC signal or the conditioned power signal to the load device based on the action.

To extend the transmission distance with the voltage supply source and improve the communication performance of PLCs Solution. The power supply circuit includes a step-down DC/DC converter to which a voltage supplied from the power line is input and to which an input voltage is stepped down and output, a step-up/down DC/DC converter to which a voltage output from the step-down DC/DC converter or a voltage supplied from the power line is input and to which the input voltage is stepped up or stepped down and output to the power line communication circuit, a switch circuit for connecting an input of the step-up/down DC/DC converter to an output of the step-down DC/DC converter or power line, a voltage monitoring circuit for monitoring a voltage supplied from the power line, and a control circuit for controlling connection of the switch circuit based on the voltage value of the voltage supplied from the power line.

A load control system includes a controller that modifies an alternating current (AC) signal at a controller input to provide, on a cycle-by-cycle basis, one of a plurality of unique AC signature signals to a controller output. The AC signatures correspond to different selections that a user provides to the system to instruct the system with respect to the particular load characteristic desired. The load circuit receives the plurality of unique AC signal signature signals. The load circuit changes a characteristic of the load circuit in response to the received plurality of unique AC signature signals, thus responding to the user's choice of load characteristic.