The invention relates to a method for supplying electrical energy (10), wherein a heat accumulator (2) is charged with thermal energy (3) in a heat charging station (1), wherein the thermal energy (3) is converted into electrical energy (10) in a conversion station (5). The invention also relates to an energy supply system for supplying electrical energy (10), in particular according to said method, wherein the energy supply system has at least one heat accumulator (2), and wherein the energy supply system has a heat charging station (1) for charging the heat accumulator (2) with thermal energy (3). The energy supply system has a conversion station (5) for converting thermal energy (3) stored in the heat accumulator (2) into electrical energy (10), wherein the system has an energy generating device for generating electrical energy (10), and wherein the system is designed to convert electrical energy (10) generated by the energy generating device into thermal energy (3) and to store same in the heat accumulator (2).

Systems and methods are described herein to accommodate different settings associated with a converter-based electric power generator and an inverter-based electric power generator for electric power generation within an electric power delivery system. The electric power delivery system may provide electric power generated by a bulk electric system to the loads via distributed substations using a first operating frequency. Moreover, the distributed substations may include inverter-based electric power generators to supply the electric power demand of downstream loads in an islanded configuration. That said, the inverter-based electric power generators may supply the electric power using a second frequency that is higher than the first frequency. Protective systems, positioned downstream from the distributed substations, may use different settings associated with the bulk electric system or the inverter-based electric power generators based on detecting the frequency of the supplied electric power.

This invention relates to hydraulic energy storage and management systems. In particular, this invention relates to a hydraulic energy management system that has a reconfigurable energy storage and release capability that adjusts to varying available energy input and power demand output requirements. The hydraulic energy management system can be resized by a hydraulic bridge circuit to permit hydraulic power units to be added or removed, both physically and operationally, to capture available energy over time, adjust to peak demand cycles, and maintain power output in the event of a failure of a portion of the system.

This invention relates to hydraulic energy storage and management systems. In particular, this invention relates to a hydraulic energy management system that has a reconfigurable energy storage and release capability that adjusts to varying available energy input and power demand output requirements. The hydraulic energy management system can be resized by a hydraulic bridge circuit to permit hydraulic power units to be added or removed, both physically and operationally, to capture available energy over time, adjust to peak demand cycles, and maintain power output in the event of a failure of a portion of the system.

This application provides a power generation system. The power generation system may include an integration system and a power transformation system. The integration system may include a plurality of inverters and a plurality of first switches. The plurality of inverters are connected in series to the plurality of first switches in a one-to-one correspondence. Each inverter converts a direct current from a direct current power supply into an alternating current, and outputs the alternating current to a corresponding first switch. Alternating currents of the plurality of first switches from corresponding inverters are combined and output to the power generation system, and the plurality of inverters and the power transformation system are isolated from each other. The power transformation system adjusts a voltage value of the combined alternating current and outputs the voltage value to a power grid.

This application provides a power generation system. The power generation system may include an integration system and a power transformation system. The integration system may include a plurality of inverters and a plurality of first switches. The plurality of inverters are connected in series to the plurality of first switches in a one-to-one correspondence. Each inverter converts a direct current from a direct current power supply into an alternating current, and outputs the alternating current to a corresponding first switch. Alternating currents of the plurality of first switches from corresponding inverters are combined and output to the power generation system, and the plurality of inverters and the power transformation system are isolated from each other. The power transformation system adjusts a voltage value of the combined alternating current and outputs the voltage value to a power grid.

This disclosure describes novel hybrid energy storage systems for providing short-term and long-term storage and delivery of electricity generated by any energy source including renewable energy sources such as solar energy and wind energy. The hybrid energy storage systems described herein have a higher overall real-world efficiency than energy storage systems currently available.

A control method and system for a distribution network with distributed mobile energy storage systems is disclosed which relates to the power field. The present invention manages the multiple distributed mobile energy storage systems in the distribution network in a unified way, to improve the flexibility of the distribution network, and enable the distributed mobile energy storage systems to fully smooth new energy generation fluctuations, implement peak cut, facilitate grid auxiliary services, and improve the power quality. The control method includes: acquiring, by a sub-station coordination system, data of the distributed mobile energy storage systems; receiving, by a master-station dispatching system, the data of the distributed mobile energy storage systems, and obtaining external data; generating, by the master-station dispatching system, a control instruction; and controlling, by the sub-station coordination system, the distributed mobile energy storage systems. The control system includes the master-station dispatching system and the sub-station coordination systems.

A control method and system for a distribution network with distributed mobile energy storage systems is disclosed which relates to the power field. The present invention manages the multiple distributed mobile energy storage systems in the distribution network in a unified way, to improve the flexibility of the distribution network, and enable the distributed mobile energy storage systems to fully smooth new energy generation fluctuations, implement peak cut, facilitate grid auxiliary services, and improve the power quality. The control method includes: acquiring, by a sub-station coordination system, data of the distributed mobile energy storage systems; receiving, by a master-station dispatching system, the data of the distributed mobile energy storage systems, and obtaining external data; generating, by the master-station dispatching system, a control instruction; and controlling, by the sub-station coordination system, the distributed mobile energy storage systems. The control system includes the master-station dispatching system and the sub-station coordination systems.

This disclosure discloses a braking-recovery system and method for a train, and a train. The system includes: a traction network, a train, and an energy storage power station. The energy storage power station is connected to the traction network, the energy storage power station includes a second controller, and the second controller controls the energy storage power station according to the voltage of the traction network to perform charging or discharging. The train includes: an electric brake; a battery; a distributor, connected to the electric brake, where there is a node between the distributor and the electric brake; a bidirectional DC/DC converter, where one end of the bidirectional DC/DC converter is connected to the battery, and another end of the bidirectional DC/DC converter is connected to the node; and a first controller, used to control, when the train is braked, the distributor and the bidirectional DC/DC converter to feed back braking electric energy of the train to the traction network, and control the bidirectional DC/DC converter according to a voltage of the traction network to absorb the braking electric energy of the train by using the battery.