Redundancy control method for flexible direct current transmission system

Abstract

The invention relates to a redundancy control method for a flexible direct current transmission system, and belongs to the field of an electric power system. The method adopts two control systems which are a main control system and a redundancy control system, wherein the two control systems are identical in function and can control operations of the whole direct current transmission system independently at specific conditions. The main control system carries out control on a flexible direct current system and transmits operation control information to a redundant system through a high-speed optical fiber at the same time, and the redundant system stays at a hot standby state. When the main control system is abnormal, the redundant system identifies automatically and completes control for the flexible direct current system automatically according to the received operation control information before the abnormity, the redundant system turns into the main control system, and the original main control system is notified to turn into the redundant system. According to the method provided by the invention, the redundant system automatically completes control for the flexible direct current system when the main control system is abnormal, the failure rate of the system is reduced, and the operation reliability of the system is improved.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to the control technology of a flexible direct current transmission system including a distributed power supply. Background technique [0002] Traditional AC transmission has great limitations. Due to the skin effect, corona effect and its own structure, when the transmission distance exceeds a certain distance, the cost of AC transmission is higher than that of DC transmission; the power of AC transmission depends on the phase difference between the two ends of the line. The phase difference increases as the transmission distance increases; the voltage control of the AC line is complex and needs to be compensated; the AC transmission cannot realize asynchronous networking; the zero-sequence current in the AC transmission can not only affect the efficiency of power transmission, but also generate electromagnetic waves. interference; in contrast, DC transmission has great advantages, the D...

AI Technical Summary

Problems solved by technology

[0002] Traditional AC transmission has great limitations. Due to the skin effect, corona effect and its own structure, when the transmission distance exceeds a certain distance, the cost of AC transmission is higher than that of DC transmission; the power of AC transmission depends on the phase difference between the two ends of the line. The phase difference increases as the transmission distance increases; the voltage control of the AC line is complex and needs to be compensated; the AC transmission cannot realize asynchronous networking; the zero-sequence current in the AC transmission can not only affect the efficiency of power transmission, but also generate electromagnetic waves. interference; in contrast, DC transmission has great advantages, the DC line current and power can be adjusted quickly and conveniently, and the short-circuit current is small; there is no capacitive current in the steady state operation of the line, and the voltage distribution along the line is stable; each pole can be used as an independent Loop operation, when there is a problem with one pole, the healthy pole can still deliver part of the power

Images