Abstract: The disclosure provides a grid-tied power generation system and a grid-tied power fluctuation suppression device and method thereof. The system includes a first direct current source, an inverter, and a power grid. The device includes a second direct current source, connected to a direct current side of the inverter; and a power allocation unit, respectively connected to the second direct current source and the inverter. The power allocation unit obtains a power reference value of the first direct current source and a power feedback value of the first direct current source, calculates an alternating current power reference value and a power reference value of the second direct current source according to the power reference value and the power feedback value, and controls the inverter through the alternating current power reference value and controls the second direct current source through the power reference value of the second direct current source.

Abstract: A charging system utilizing energy storage multiplication is provided. An energy storage battery pack of the charging system is directly connected to a DC power transmission bus. When the charging request is initiated by the charging device, the charging device takes the power from the DC bus, the AC-DC converter and DC-DC converter connected to the energy generation device work as the energy source to deliver power to the DC bus, the power goes through the DC bus to the charging device, and the rest of the power goes to the energy storage device or goes out form the energy storage device when the charring power is higher than total energy from all other converters. The high C rate discharging of the energy storage device means high power capacity during discharging, this can provide much high power than AC-DC converter to fulfill the requirement of charging device.

Abstract: The disclosure provides a grid-tied power generation system and a grid-tied power fluctuation suppression device and method thereof. The system includes a first direct current source, an inverter, and a power grid. The device includes a second direct current source, connected to a direct current side of the inverter; and a power allocation unit, respectively connected to the second direct current source and the inverter. The power allocation unit obtains a power reference value of the first direct current source and a power feedback value of the first direct current source, calculates an alternating current power reference value and a power reference value of the second direct current source according to the power reference value and the power feedback value, and controls the inverter through the alternating current power reference value and controls the second direct current source through the power reference value of the second direct current source.

Abstract: An electric vehicle charging station management method using a blockchain is provided, including the following steps: obtaining a maximum charging and a discharging electric power of each electric vehicle in each to-be-planned pane; obtaining a charging and discharging electric power of each electric vehicle in each to-be-planned pane according to electric vehicle information corresponding to the electric vehicle, at least one purchase price, at least one winning bid price, and at least one maximum charging and discharging electric power; determining whether at least one overloaded pane is provided according to a total consumed electric power of a charging station in each time pane; and adjusting the purchase price of each overloaded pane when it is determined that at least one overloaded pane is provided and re-planning the charging and discharging electric power of the electric vehicle in each to-be-planned pane until it is determined that no overloaded pane is provided.

Abstract: An inverter parallel system and a zero feed-in control method for the inverter parallel system are provided. The system includes at least one first inverter, at least one second inverter, a load, an electrical grid, a controller, and an electrical parameter measuring device. The controller includes a system control module, and the first inverter includes an inverter control module. The system control module is configured to determine a battery power reference value of an energy storage battery according to an electrical grid current reference value and an electrical grid current sampling value. The inverter control module is configured to control the first inverter, such that a feed-in current flowing into the electrical grid side is zero, and the second inverter operates in a maximum power point tracking state. Therefore, in the system, zero feed-in control may be achieved without energy management and without communication between inverters.

Abstract: The present disclosure provides a method and system for ground fault detection. The method may include obtaining an input voltage and a null-ground voltage; determining whether the null-ground voltage is less than a voltage threshold; if yes, further determining whether the null-ground voltage is less than a preset voltage; if yes, determining that the grounding state is normal; if the null-ground voltage is greater than or equal to the preset voltage, determining that the grounding state is abnormal; if the null-ground voltage is greater than or equal to the voltage threshold, determining that the live wire and the null wire are reversed; in the case that the live wire and the null wire are reversed, determining whether the difference between the input voltage and the null-ground voltage is less than the preset voltage; if yes, determining that the grounding state is normal; if no, determining that the grounding state is abnormal.

Abstract: A charging system utilizing energy storage multiplication is provided. An energy storage battery pack of the charging system is directly connected to a DC power transmission bus. When the charging request is initiated by the charging device, the charging device takes the power from the DC bus, the AC-DC converter and DC-DC converter connected to the energy generation device work as the energy source to deliver power to the DC bus, the power goes through the DC bus to the charging device, and the rest of the power goes to the energy storage device or goes out form the energy storage device when the charring power is higher than total energy from all other converters. The high C rate discharging of the energy storage device means high power capacity during discharging, this can provide much high power than AC-DC converter to fulfill the requirement of charging device.

Abstract: The disclosure relates to a modular high-power off-board charger. The charger includes an AC module, a DC module, a rectifier module and a wire harness module. The AC module is provided with an AC module connector, the DC module is provided with a DC module connector, the rectifier module is provided with a rectifier module connector, and the wire harness module is provided with an AC wire harness connector docked with the AC module connector, a DC wire harness connector docked with the DC module connector, and a rectifier wire harness connector docked with the rectifier module connector. The AC wire harness connector, the DC wire harness connector and the rectifier wire harness connector are electrically connected in the wire harness module.

Abstract: A charging base with a replaceable terminal element for an electric vehicle includes a fixing component and a replaceable terminal element that cooperate with each other. A DC replaceable terminal assembly includes a plastic sheath, insertion grooves and a sheath base connected to each other. A terminal is connected inside each of the insertion grooves. The sheath base is connected to the fixing component. A lower part of the terminal is provided with a knurled structure, and a lower end of the terminal is connected to the jack socket of the fixing component. A bottom part of the sheath base is provided with a waterproof groove and a terminal protection ring. A sealing gasket is connected in the waterproof groove, and has through holes.

Abstract: The present disclosure provides a method and system for ground fault detection. The method may include obtaining an input voltage and a null-ground voltage; determining whether the null-ground voltage is less than a voltage threshold; if yes, further determining whether the null-ground voltage is less than a preset voltage; if yes, determining that the grounding state is normal; if the null-ground voltage is greater than or equal to the preset voltage, determining that the grounding state is abnormal; if the null-ground voltage is greater than or equal to the voltage threshold, determining that the live wire and the null wire are reversed; in the case that the live wire and the null wire are reversed, determining whether the difference between the input voltage and the null-ground voltage is less than the preset voltage; if yes, determining that the grounding state is normal; if no, determining that the grounding state is abnormal.