7results about "Single ac network with different frequencies" patented technology

A microgrid system includes a plurality of energy resource systems including direct current (DC) energy resource systems and alternating current (AC) energy resource systems configured to supply power to the microgrid, a plurality of local controllers respectively associated with the energy resource systems for controlling the respective energy resource systems, and a microgrid controller. Each local controller is configured to determine an available output power of the respective energy resource system based on one or more operational constraints and send an indication of the available output power to the microgrid controller. The microgrid controller is configured to determine a net available DC output power available from the DC energy resource systems and a net available AC output power available from the AC energy resource systems based on the available output power indicated by each local controller.

A resilient on-site microgrid system includes a multiport power router directly connected to various energy sources, including batteries, renewable energy sources, and broader grid power, as well as various loads, including electric vehicle chargers. The multiport power router dynamically adjusts power provided from the various power sources and to the various loads, especially to power devices in a nearby facility. The microgrid system includes various bypass systems allowing for powering of critical loads in the event of failure of individual components or pathways within the microgrid system.

The application discloses a kind of AC / DC hybrid distribution network power flow calculation method and device considering incomplete LU decomposition preconditioning, and relates to the field of smart grid.The method comprises the following steps: establishing active / reactive control equation based on VSC steady-state equation;Based on Kirchhoff's current law, establish AC / DC node power imbalance equation;Taylor expansion is carried out on the above equation, and high-order terms are ignored, to obtain linearized unified power flow equation set and matrix form Jacobian matrix;Incomplete LU decomposition preconditioning is carried out on Jacobian matrix, and stable double-conjugate gradient method is used to solve, to obtain power flow solution.The application establishes unified linearized power flow model, combines incomplete LU decomposition preconditioning and stable double-conjugate gradient method, effectively reduces the sensitivity to initial value, improves the robustness and convergence speed of complex AC / DC hybrid system power flow calculation.

The application provides an input switching method and device compatible with AC / DC power supply and a power supply device. The switching device comprises an input voltage detection circuit, a rectifier, an energy storage capacitor, an output voltage detection circuit, a relay, a sampling resistor and a controller. The controller is connected with the output end of the input voltage detection circuit, the output end of the output voltage detection circuit and the second switch end of the relay, respectively, for controlling the relay to be disconnected according to the received power supply switching signal, and for controlling the relay to be attracted when the difference between the voltage value output by the input voltage detection circuit and the voltage value output by the output voltage detection circuit is less than or equal to a preset threshold. The application can realize stable and fast switching of the input AC / DC power supply of the servo drive and the frequency conversion device, prevent the load from being impacted by current, and ensure the reliable operation of the load when the external input power supply supplies power to the load after the AC / DC power supply is switched and the input voltage and the output voltage are relatively stable.

A modular multiport converter system includes a plurality of distributed controllers, associated with different ports of the system that are able to synchronize to ensure that power drawn from the system is equal to power supplied to the system with precise timing. The distributed controllers are able to receive a clock signal from a leader controller, or from a vice leader controller in the event that leader controller is unable to function.

A microgrid system includes a plurality of energy resource systems, including direct current (DC) energy resource systems and alternating current (AC) energy resource systems, configured to supply power to a microgrid; a plurality of local controllers respectively associated with an energy resource system for controlling the respective energy resource system; and a microgrid controller. Each local controller is configured to determine an available output power for a respective energy resource system based on one or more operational constraints, and transmit an indication of the available output power to the microgrid controller. The microgrid controller is configured to determine, based on the available output power indicated by each local controller, a net available DC output power available from the DC energy resource systems and a net available AC output power available from the AC energy resource systems.

A microgrid system includes a plurality of energy resource systems, including direct current (DC) energy resource systems and alternating current (AC) energy resource systems, configured to supply power to a microgrid; a plurality of local controllers respectively associated with an energy resource system for controlling the respective energy resource system; and a microgrid controller. Each local controller is configured to determine an available output power for a respective energy resource system based on one or more operational constraints, and transmit an indication of the available output power to the microgrid controller. The microgrid controller is configured to determine, based on the available output power indicated by each local controller, a net available DC output power available from the DC energy resource systems and a net available AC output power available from the AC energy resource systems.