A medium-high voltage energy conversion system, and a control method and a controller therefor are provided. In the control method, an operation state of the medium-high voltage energy conversion system is acquired. In a case that the system is in a normal operation state, the system is controlled to operate in a first direct circuit current source mode. In a case that the system is in a first fault state in which a direct current grid voltage drops, the system is controlled to operate in a direct current voltage source mode. In a case that the system is in a second fault state in which a direct current grid voltage is in an overvoltage state, the system is controlled to operate in a second direct circuit current source mode.

A medium-high voltage energy conversion system, and a control method and a controller therefor are provided. In the control method, an operation state of the medium-high voltage energy conversion system is acquired. In a case that the system is in a normal operation state, the system is controlled to operate in a first direct circuit current source mode. In a case that the system is in a first fault state in which a direct current grid voltage drops, the system is controlled to operate in a direct current voltage source mode. In a case that the system is in a second fault state in which a direct current grid voltage is in an overvoltage state, the system is controlled to operate in a second direct circuit current source mode.

A medium-high voltage energy conversion system, and a control method and a controller therefor are provided. In the control method, an operation state of the medium-high voltage energy conversion system is acquired. In a case that the system is in a normal operation state, the system is controlled to operate in a first direct circuit current source mode. In a case that the system is in a first fault state in which a direct current grid voltage drops, the system is controlled to operate in a direct current voltage source mode. In a case that the system is in a second fault state in which a direct current grid voltage is in an overvoltage state, the system is controlled to operate in a second direct circuit current source mode.

A medium-high voltage energy conversion system, and a control method and a controller therefor are provided. In the control method, an operation state of the medium-high voltage energy conversion system is acquired. In a case that the system is in a normal operation state, the system is controlled to operate in a first direct circuit current source mode. In a case that the system is in a first fault state in which a direct current grid voltage drops, the system is controlled to operate in a direct current voltage source mode. In a case that the system is in a second fault state in which a direct current grid voltage is in an overvoltage state, the system is controlled to operate in a second direct circuit current source mode.

A power supply device including a first power supply, a second power supply, a voltage control unit (VCU) stepping up a voltage from an input terminal to an output terminal, and an electronic control unit (ECU) is provided. The VCU includes an upper arm, a lower arm, a reactor having one end connected to the input terminal and the other end connected to a connection midpoint between the upper arm and the lower arm, and a current sensor acquiring a value of a current flowing in the reactor. At startup of the VCU, after performing a startup control that gradually increases a duty ratio of a transistor of the lower arm while turning off a transistor of the upper arm, the ECU performs a normal control that complementarily drives the transistors. During the startup control, the ECU determines whether to terminate the startup control using the acquired current value.

A power supply device including a first power supply, a second power supply, a voltage control unit (VCU) stepping up a voltage from an input terminal to an output terminal, and an electronic control unit (ECU) is provided. The VCU includes an upper arm, a lower arm, a reactor having one end connected to the input terminal and the other end connected to a connection midpoint between the upper arm and the lower arm, and a current sensor acquiring a value of a current flowing in the reactor. At startup of the VCU, after performing a startup control that gradually increases a duty ratio of a transistor of the lower arm while turning off a transistor of the upper arm, the ECU performs a normal control that complementarily drives the transistors. During the startup control, the ECU determines whether to terminate the startup control using the acquired current value.