Abstract: An apparatus is provided for controlling uninterruptible power supply (UPS) for grid. It comprises a power bus; an energy storage system connected to the power bus; a load connected to the power bus; a renewable energy connected to the power bus; an extra generator connected to the power bus; a static switch connected to mains and the energy storage system; and a synchronizing switch connected to the extra generator. When the grid is turned from mains-connected to islanding or is already operated in an islanding mode owing to the failure of the energy storage system, the extra generator can be used as a voltage source. The stability and safety of the grid is enhanced. Furthermore, the voltage source can be put under the control of either the energy storage system or the extra generator according to requirements. Thus, stability and reliability of power supply for the grid are increased.

Abstract: A smart grid monitoring device with multi-agent function is provided, which may include a measurement module, a communication module and a control module. The measurement module may measure at least one real-time electric signal of a power transaction system or an electric unit. The control module may execute a self-developed program to provide at least one agent functionality and then control the electric unit according to the at least one real-time electric signals measured; the communication module can transmit the at least one real-time electric signal to other monitoring devices or the main computer of the power dispatch transaction system, and can control the electric unit according to the at least one electric signal. The communication module can receive electric demand signals from the power company or other monitoring devices of the power dispatch transaction system via the main computer to execute the electricity transaction with the bidding mechanism.

Abstract: A smart grid monitoring device with multi-agent function is provided, which may include a measurement module, a communication module and a control module. The measurement module may measure at least one real-time electric signal of a power transaction system or an electric unit. The control module may execute a self-developed program to provide at least one agent functionality and then control the electric unit according to the at least one real-time electric signals measured; the communication module can transmit the at least one real-time electric signal to other monitoring devices or the main computer of the power dispatch transaction system, and can control the electric unit according to the at least one electric signal. The communication module can receive electric demand signals from the power company or other monitoring devices of the power dispatch transaction system via the main computer to execute the electricity transaction with the bidding mechanism.

Abstract: A DC power system is provided to generate the power from renewable energy and directly supplies the DC power to DC household appliances, thus saving energy that would be wasted during the conversion of DC to AC and back to DC and saving the cost of a rectifier or power factor corrector. The DC power system includes a generator, a DC/DC converter, a battery bank, a bi-directional inverter, a DC load and a controller.

Abstract: A DC power system is provided to generate the power from renewable energy and directly supplies the DC power to DC household appliances, thus saving energy that would be wasted during the conversion of DC to AC and back to DC and saving the cost of a rectifier or power factor corrector. The DC power system includes a generator, a DC/DC converter, a battery bank, a bi-directional inverter, a DC load and a controller.