Bypass device and method of HVDC sub module
AssigneeHyosung Heavy Industries Corporation
InventorsJung Ki Hong, Dong Woo Seo
Life of this patent
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Abstract
A bypass device of an HVDC sub module according to the present invention comprises: a sub module for generating a voltage in an HVDC system; a bypass switch driving unit for driving a bypass switch located at an input terminal of the sub module; a sub module controller for monitoring a state of the sub module to transmit the monitored state to a system controller, and controlling the sub module and the bypass switch driving unit according to a command of the system controller; and a voltage monitoring unit for controlling the bypass switch driving unit by monitoring a voltage of a capacitor located in the sub module.
Claims10
A device for bypassing a sub-module in a high voltage direct current (HVDC) system, the device comprising:
- the sub-module configured to generate a voltage in the HVDC system;
- a bypass switch driving unit configured to drive a bypass switch positioned at an input of the sub-module;
- a sub-module controller configured to monitor a voltage of a capacitor positioned in the sub-module to transmit the monitored voltage to a system controller and control the sub-module and the bypass switch driving unit according to a command of the system controller;
- and
- a voltage monitoring unit configured to monitor the voltage of the capacitor positioned in the sub-module and control the bypass switch driving unit,
- wherein, when the voltage of the capacitor exceeds a bypass switch-on voltage by the sub-module controller positioned between an operating voltage and a capacitor limit voltage, the sub-module controller controls the bypass switch driving unit to perform bypass at the input of the sub-module, and
- wherein, when the voltage of the capacitor exceeds a bypass switch-on voltage by the voltage monitoring unit positioned between the bypass switch-on voltage by the sub-module controller and the capacitor limit voltage, the voltage monitoring unit controls the bypass switch driving unit to perform bypass at the input of the sub-module.
A method of bypassing a sub-module in a high voltage direct current (HVDC) system, the method comprising:
- a system controller command receiving operation of receiving, by a sub-module controller, a control command from a system controller;
- an energy storage operation of, when the control command indicates energy storage, controlling, by the sub-module controller, an insulated gate bipolar transistor1 (IGBT1) and an insulated gate bipolar transistor2 (IGBT2) of the sub-module to construct a path through which energy is storable in a capacitor in the sub-module;
- an energy release operation of, when the control command indicates energy release, controlling, by the sub-module controller, the IGBT1 and the IGBT2 of the sub-module to construct a path through which the energy of the capacitor in the sub-module is releasable;
- a bypass operation of, when the control command indicates bypass, controlling, by the sub-module controller, the IGBT1 and the IGBT2 of the sub-module to block a path with the capacitor in the sub-module and construct a bypass path;
- a capacitor voltage transmitting operation of, when it is checked whether a voltage of the capacitor in the sub-module is greater than a bypass switch-on voltage by the sub-module controller and the voltage of the capacitor is less than the bypass switch-on voltage by the sub-module controller, transmitting the voltage of the capacitor to the system controller;
- a bypass switch driving unit turning-on operation of, when the voltage of the capacitor in the sub-module is greater than the bypass switch-on voltage by the sub-module controller, comparing the voltage of the capacitor in the sub-module with a bypass switch-on voltage by a voltage monitoring unit and, when the voltage of the capacitor is greater than the bypass switch-on voltage by the voltage monitoring unit, turning a bypass switch driving unit on;
- and
- a bypass switch turning-on operation of turning, by the bypass switch driving unit, a bypass switch on,
- wherein the bypass switch-on voltage by the voltage monitoring unit is positioned between the bypass switch-on voltage by the sub-module controller and a capacitor limit voltage.
Dependencies are inferred from the claim text.