Master-slave control system and method used for parallel operation of APF/SVG

Abstract

The invention, which belongs to the power electronic control technology field, relates to a master-slave control system and a method used for a parallel operation of APF / SVG. The system comprises the following parts: a master controller, slave controllers and a plurality of voltage transformers and current transformers, wherein the voltage transformers and current transformers are arranged on a bus. Output terminals of the current transformers and the voltage transformers of a user terminal are connected with an analog quantity data interface of the master controller and are used for transmitting voltage and current information of the system; An output terminal of a total output current transformer is connected with the analog quantity data interface of the master controller and is used for transmitting output current information of the devices; a fiber interface of the master controller is connected with fiber interfaces of the slave controllers and is used for transmitting to-be compensated reactive and harmonic wave information; and the fiber interfaces of the salve controllers are connected with the fiber interface of the main controller and are used for transmitting information of operation states of the all slave controllers to realize closed-loop control. According to the invention, all parallel devices have good compensation effects and utilization rates of the devicesunder unified control of the master controller.

Description

technical field [0001] The present invention relates to a system and method in the technical field of power electronic control, in particular to a master-slave control system and method for APF (Active Power Filter) / SVG (Static Var Generator) parallel operation. Background technique [0002] Power electronic devices such as APF / SVG are limited by device level and manufacturing process, and the capacity of a single device cannot be made very large. When the current to be compensated by the system exceeds the rated compensation capacity of a single device, multiple devices are usually selected to operate in parallel. The way. Or users have already used power electronic devices such as APF / SVG, and when they want to expand the capacity, they will also choose the mode of parallel operation of multiple devices. [0003] The traditional way of connecting multiple devices in parallel, such as figure 1 As shown, devices 1 to N are respectively connected to the busbar, and the seco...

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Problems solved by technology

[0005] However, this prior art is designed for frequency converters and is not suitable for APF / SVG devices

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