The invention discloses an isolated bidirectional AC/DC converter suitable for V2G behaviors and relates to the technical field of a power supply system. The converter specifically comprises a first high-frequency rectifier, a second high-frequency rectifier, a high-frequency inverter and a high-frequency transformer, wherein the high-frequency transformer is an isolated high-frequency transformer, a first end of the second high-frequency rectifier is connected with a second end of the high-frequency inverter through a first capacitor, a first end of the high-frequency inverter is connected with a second end of the high-frequency transformer through a second capacitor, and a first end of the high-frequency transformer is connected with a first high-frequency rectifier. The converter is advantaged in that the high-frequency inverter is connected with the isolated high-frequency transformer, so the alternating current is converted into a stable direct current, and an electric automobileis stably charged.

Isolated bidirectional AC/DC converter suitable for V2G behaviors

The invention discloses an energy storage charging pile. The energy storage charging pile comprises high-frequency isolation DC/DC conversion devices and direct current buses, high-frequency isolationAC/DC conversion devices and direct current buses, an electric vehicle charging device and a charging port as well as energy storage devices and energy storage buses, wherein the DC/DC conversion devices can be unidirectional or bidirectional; and the AC/DC conversion devices can also be unidirectional or bidirectional. The different energy storage devices can be treated differently, and can be respectively charged or discharged, meanwhile, electric energy of an alternating-current power grid, electric energy stored by the energy storage devices and electric energy of a battery in an electricvehicle can be combined simultaneously, so that the electric energy of the alternating-current power grid, the electric energy stored by the energy storage devices and the electric energy of the battery in the electric vehicle can flow freely, impact of charging on the alternating-current power grid can be reduced, and meanwhile, the battery in the vehicle can be effectively utilized as an energystorage device to feed the power grid reversely or charge the energy storage devices, and thus, an integrated solution is achieved.

Energy storage charging pile

The invention relates to a fine control method of a matrix type V2G pile and relates to the field of electric vehicle charging piles. The fine control method comprises the following steps of organizing matrix type modules in the charging pile into a module group in advance according to an algorithm, i.e., a module calling method; when handshaking of the electric vehicle and the charging pile is completed, the charging control unit sets the NumMOD_READY charging modules to be in a hot standby state; in the charging stage, the charging control unit acquires the voltage and current requirements and the charging mode of the electric vehicle, adjusts the number of accessed modules, and calls the module group to charge the electric vehicle according to a module calling method; and finally, the charging power is distributed to each module according to the charging power conversion rate of the module. The method guarantees that the AC-DC conversion module works at the optimal efficiency pointor the system works at the optimal efficiency point under the condition of meeting the charging voltage and current requirements and the charging mode of the electric vehicle, improves the utilizationrate of electric energy, and reduces heat loss of the system.

Fine control method of matrix type V2G pile

The invention discloses a centralized energy storage charging pile. The charging pile comprises two-way or unidirectional DC/DC conversion device with a high-frequency isolation transformation function and a direct-current bus. A first connecting point of the DC/DC device is connected to one or more energy storage devices through an energy storage bus, and a second connecting point is connected tothe direct-current bus. The charging pile also comprises first and second two-way or unidirectional AC/DC conversion devices with a high-frequency isolation transformation function. Electric energy of the energy storage device can be concentrated in the energy storage bus, and the electric energy of the energy storage device, electric energy of an alternating-current power grid and electric energy of a battery in an electric vehicle are combined, so that the electric energy can freely flow among the energy storage bus, the alternating-current power grid and the battery, and impact of chargingof the electric vehicle on the alternating-current power grid is reduced. Meanwhile, the battery in the vehicle can be effectively utilized and used for energy storage to feed the power grid or charge the energy storage device reversely, the electric energy of the energy storage device can also be used for charging the electric vehicle or feeding the power grid, and an integrated solution is formed.

Centralized energy storage charging pile

Disclosed is an energy storage charging system. The system includes a bidirectional DC/DC conversion apparatus capable of high-frequency isolation conversion and a direct-current bus bar, an AC/DC conversion apparatus capable of high-frequency isolation conversion and a direct-current bus bar, and an electric vehicle charging system. A first connection point of the bidirectional DC/DC apparatus is connected to an energy storage apparatus, a second connection point thereof is connected to the direct-current bus bar, and the bidirectional DC/DC apparatus carries out high-frequency isolation conversion on electric energy of the energy storage apparatus and then carries out bidirectional communication with the direct-current bus bar; and a first connection point of the AC/DC apparatus is connected to a power grid, and a second connection point thereof is connected to the same direct-current bus bar. The energy storage apparatus of the present invention is isolated from the direct-current bus bar by means of a high-frequency isolation transformer of the bidirectional conversion apparatus capable of high-frequency isolation, and electric energy passing through the transformer is adjusted, so that a charging voltage and a charging current of the direct-current bus bar for the energy storage apparatus are adjusted, and a discharging voltage and a discharging current of the energy storage apparatus for the direct-current bus bar are adjusted, thereby achieving the aim of charging an electric vehicle.

Zhu Chunhui

Papers

Energy storage charging system

Energy storage charging pile

Centralized energy storage charging pile