Modularized multilevel flexible DC (direct current) transmission valve base control equipment

Abstract

The invention provides modularized multilevel flexible DC (direct current) transmission valve base control equipment which comprises power panels, interface boards, a back plate and central processing boards, wherein the power panels and the interface boards are arranged at the two sides of the central processing boards; the central processing boards, the interface boards and the power panel sare arranged on the back plate. In the invention, a unified hardware structure design is adopted so that a circuit control unit and a bridge arm control unit in the valve base control equipment can be combined flexibly, thus satisfying demands of different flexible DC transmissions projects; a design of dual central processing boards is adopted to ensure the reliability of real-time operation and improve the operation efficiency of the central processing boards; Lvds (low voltage differential signaling) data bus and clock bus are simultaneously used to improve the data transmission rate and ensure the synchronism of data transmitting; the designs of dual central processing boards and alternative interface board can improve the reliability of data transmission and has good extension; the design of dual power panels can improve the reliability of power supply, and electric maintenance and hot plugging can be realized.

Description

Technical field: [0001] The invention relates to the field of power electronic direct current transmission of electric power systems, in particular to a design of a modular multilevel flexible direct current transmission valve-based control equipment chassis. Background technique: [0002] Flexible DC transmission is a new power transmission method using DC as an intermediary. It uses voltage source converters based on turn-off devices and advanced modulation technology for DC transmission. It is a beneficial supplement to the AC grid and can realize power transmission. At the same time, improve the transmission capacity and stability of the existing AC transmission system, so that the existing AC transmission system can be used more effectively. The modular multilevel converter is composed of multiple sub-modules in series, and the sub-modules are composed of bypass switches, thyristors, IGBTs, diodes and capacitors. Modular multilevel converters need to perform different ...

AI Technical Summary

Problems solved by technology

Modular multi-level converters need to perform different real-time switching controls on individual sub-modules according to the capacitor voltage and the working status of the sub-modules. The more levels, the shorter the real-time control cycle, and the more difficult it is to achieve capacitor voltage balance control

At the same time, in addition to IGBT, sub-modules also have protection thyristors, bypass switches and other components, while the traditional DC transmission valve-based electronic equipment is only an actuator. In addition to valve monitoring and protection functions, it does not have real-time control capabilities for different sub-modules. It can no longer meet the control and protection requirements of modular flexible DC transmission valves, so a device with real-time control and protection functions is needed to meet the requirements of modular multi-level flexible DC transmission

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