Redundant bypass circuit of flexible DC power module

Abstract

A redundant bypass circuit of a flexible direct current power module comprises a direct current capacitor of the power module, an energy taking power supply, a bypass driving board, a bypass switch, a divider resistor, a local module control board and an adjacent module control board, the input side of the energy taking power supply is connected to the two ends of the direct current capacitor in parallel, and the output side of the energy taking power supply is connected with the bypass driving board. The divider resistors are connected to the two ends of the direct-current capacitor and play a role in discharging the direct-current capacitor, and the bypass driving board communicates with the local module control board and the adjacent module control board through optical signals; in the flexible DC power module, any excitation coil in the main bypass loop or the redundant bypass loop is electrified to ensure that the bypass switch is switched on; a first resistor and a second resistor in the divider resistor are connected in series and then connected with the DC capacitor in parallel; the energy-taking power supply output supplies power to an energy storage capacitor of the main bypass circuit; the divider resistor and the series connection point supply power to an energy storage capacitor of the redundant bypass circuit; the main bypass loop and the redundant bypass loop are provided for the flexible direct current power module, are independent of each other and are high in anti-interference capability, the reliability of the bypass of the power module is effectively improved, and a guarantee foundation is laid for operation of the flexible direct current converter valve power module.

Description

technical field [0001] The invention belongs to the field of flexible DC power transmission, and in particular relates to a redundant bypass circuit of a flexible DC power module. Background technique [0002] Modular multilevel converter based HVDC (MMC-HVDC) technology is a new type of DC power transmission technology for voltage source converters. Each bridge arm of the MMC converter valve is composed of multiple sub-modules connected in series. Each sub-module is designed with a bypass protection function, equipped with a set of bypass switchgear, which can quickly bypass and isolate the power module after a fault occurs, avoiding the trip and shutdown of the converter valve system caused by the expansion of the fault, which affects the stability of the power transmission system The drive circuit for closing the bypass switch becomes very important. However, in the application of the bypass switch drive circuit, due to the interruption of the control signal and the lack...

AI Technical Summary

Problems solved by technology

However, in the application of the bypass switch drive circuit, due to the interruption of the control signal and the lack of energy storage and power supply in the bypass coil, the bypass switch cannot be effectively driven when the power module fails, and there is a serious problem of refusal to operate.

Images