A redundant control method for a flexible direct current transmission system

Abstract

A redundant control method for a flexible direct current transmission system, which belongs to the field of power systems. The method adopts two sets of control systems, a main control system and a redundant control system. The functions of the two control systems are completely the same, and the entire direct current can be independently controlled under certain circumstances. Operation of the transmission system. The main control system controls the flexible straight system, and at the same time, the main control system sends the operation control information to the redundant system through high-speed optical fiber. At this time, the redundant system is in the hot standby state. When the main control system is abnormal, the redundant system will automatically identify it, and at the same time automatically complete the control of the flexible straight system according to the received operation control information before the abnormality. At this time, the redundant system becomes the main control system and notifies the original main control system to a redundant system. In this method, when the main control is abnormal, the redundant system automatically completes the control of the flexible straight system, which reduces the failure rate of the system and improves the reliability of the system operation.

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...

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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

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