Control system, valve base control equipment and submodule integration method

Abstract

The invention provides a control system, valve base control equipment and a submodule integration method. Valve base control equipment consists of two symmetric screen cabinets, wherein each screen cabinet is provided with a power supply unit, a current control unit and a bridge arm control unit; and controllers of the valve base control equipment, a control system and a submodule are connected with one another through optical fibers. All communication interfaces are in a CRC (Cyclic Redundancy Check) check based optical fiber serial communication mode of a reverse Manchester encoding form, so that data throughput is greatly increased, system control time delay is reduced, and real-time control and protection functions of a modularized multi-level flexible direct current valve can be finished. In the method, a hardware structure of the current control unit and the bridge arm control unit is adopted, so that system-level current balance control and valve-level capacitive voltage balance control are clearly divided, and the requirements for modularized multi-level real-time control are met.

Description

Technical field: [0001] The invention relates to the field of power electronic direct current transmission of a power system, in particular to a method for integrating a valve base control device, a control system and a sub-module. Background technique: [0002] The modular multi-level converter is composed of multiple sub-modules connected in series. It is necessary 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 period, and the capacitor Voltage balance control is more difficult to achieve. Since the sub-modules include sub-module controllers, IGBTs, protection thyristors and bypass switch components, the traditional DC transmission valve-based electronic equipment is only an actuator, and does not have real-time control capabilities for different sub-modules except for valve monitoring and protection functions. It ha...

AI Technical Summary

Problems solved by technology

Since the sub-modules include sub-module controllers, IGBTs, protection thyristors and bypass switch components, while traditional DC transmission valve-based electronic equipment is only an actuator, it does not have real-time control capabilities for different sub-modules except for valve monitoring and protection functions. 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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