System for realizing multi-machine parallel operation of SVG and control method thereof

Abstract

The invention discloses a system for realizing multi-machine parallel operation of SVG (Static Var Generator) and a control method thereof. The system comprises multiple SVG devices; each SVG device is provided with a pair of fiber ports respectively used for receiving and sending optical signals; as an annular topological structure is formed by connecting the SVG devices in series and in order through the fiber ports and connecting the head SVG device with the end SVG device, a fiber looped network is formed; and a host computer in the SVG devices transmits an instruction to other slave computers through the fiber looped network so as to control outputting of reactive power which requires compensation. The control method comprises the steps that the SVG device which is configured as the host computer determines a uniform distribution coefficient used for reactive power distribution in real time based on the power which requires compensation; and each SVG device carries out power compensation based on the uniform distribution coefficient and a rated output capacity. The system for realizing multi-machine parallel operation of the SVG and the control method thereof can realize rapid cooperative operation of multiple SVG devices, and have the advantages of simple structure, strong anti-interference ability, high running stability and redundancy rate of the system and the like.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a system and a control method for realizing multi-machine parallel operation of SVG (Static Var Generator, static var generator) devices. Background technique [0002] As one of the important devices in the field of power electronics, reactive power compensation devices often need to be expanded. For example, enterprises need to increase production capacity with the improvement of efficiency, so that the load power will increase accordingly. At this time, the existing power lines need to be It needs to be expanded for transformation and upgrading, and if the load power increases and the line is expanded, the reactive power compensation device needs to be expanded to meet the requirements; in addition, with the current rapid development of new energy power generation industries such as wind power and photovoltaics, a large number of wind power and photovoltaic power plant...

AI Technical Summary

Problems solved by technology

[0004] In the above scheme to realize the parallel operation of SVG devices, when 485 interface communication and CAN bus are used, the communication speed is slow and the anti-interference ability is weak; although the communication speed is fast when Ethernet communication is used, it is vulnerable to high voltage and strong electromagnetic field environment. Interference and poor real-time performance; the solution using optical fiber communication has fast communication speed and strong anti-interference ability, but in the current parallel connection scheme of SVG devices based on optical fiber communication, optical fiber connection is usually required between the master and the slave, and between the slave and the slave. Therefore, the more the number of parallel connections, the more the number of fiber optic lines required, which makes the connection method complex, the amount of information processing is large, and the interconnection communication system is complicated. There is no connection between the machine and the slave, but when the master fails, the slave cannot be switched to the master, and the entire syste

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