Flexible DC power transmission converter valve control protection system and valve control blocking method

Abstract

The invention relates to a flexible DC power transmission converter valve control protection system and a valve control blocking method, and belongs to the technical field of flexible DC power transmission of an electric power system. A pole control interface unit arranged at the uppermost layer of a valve control system is enabled to be connected with submodule interface units arranged at the lowest layer of the valve control system via an independent communication channel. When a fault occurs in the valve control system, an emergency blocking signal is transmitted to submodules by a pole control system directly via the independent communication channel between the pole control interface unit and the submodule interface units so that blocking of a converter valve is realized. The pole control system and the submodules in the converter valve are connected via the independent communication channel. When the fault occurs in the valve control system and the converter valve requires to be blocked, the emergency blocking command is directly transmitted to the submodules by the pole control system via the communication channel so that blocking of the submodules is realized. The submodules of the converter valve can still be protected from being damaged when the fault occurs in the valve control system, and the system is simple and easy to realize.

Description

technical field [0001] The invention relates to a control and protection system of a flexible direct current transmission converter valve and a valve control locking method, belonging to the technical field of flexible direct current transmission of electric power systems. Background technique [0002] The core of flexible DC transmission is the voltage source converter composed of fully controlled power electronic devices IGBT, which is called a new type of DC transmission technology, which can independently adjust reactive power while transmitting electric energy, and realize flexible power flow reversal. Energy grid connection, isolated island power transmission, power trading in large cities and other fields have broad application prospects. [0003] The core equipment of the flexible HVDC converter station mainly includes converter valves, valve control systems, pole control systems, etc., such as figure 1 shown. The converter valve is a primary electrical device that...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a flexible direct current transmission converter valve control and protection system and a valve-controlled locking method to solve the problem that the sub-module is not under control due to the failure of the valve control device to issue control instructions to the sub-module

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