Multi-terminal unified power quality controller DC side voltage control device and method

Abstract

The invention specifically relates to a DC-side voltage control device and method for a multiterminal uniform electric-energy quality controller and belongs to the technical field of power-system power electronic technology. The device includes a DC-side voltage detection circuit, a DC-side voltage-deviation calculation circuit, a PI controller, a compensation operation circuit, a conjugate filtering inductor, a serially-connected active filter, a DC-side capacitor, a plurality of hysteresis torque controllers and a plurality of parallel-connection active power filters. The plurality of parallel-connection active power filters are connected with the serially connected active filter through the DC-side capacitor. The parallel-connection active power filters are each connected with a corresponding user and a corresponding hysteresis torque controller respectively. The compensation operation circuit is connected with each user and a corresponding hysteresis torque controller of each user. The DC-side voltage control device and method for the multiterminal uniform electric-energy quality controller is capable of improving reliability of DC-side voltage control.

Description

technical field [0001] The invention specifically relates to a multi-terminal unified power quality controller DC side voltage control device and method, and belongs to the technical field of electric power electronics technology of electric power systems. Background technique [0002] With the establishment of the smart grid, in addition to traditional nonlinear loads, such as high-power power electronic devices (such as power-saving devices, etc.), high-power electric drive equipment, DC output devices, electrified railways, electric arc furnaces and other nonlinear equipment In addition to the power quality problems caused by the grid, various types of distributed power sources connected to the distribution network, various energy storage devices, and new power products such as electric vehicles will bring more new power quality problems to the grid. Distributed power is based on power electronics technology. Distributed power is connected to the distribution network thro...

AI Technical Summary

Problems solved by technology

[0012] The present invention aims at the lack of high quality of various complex and sophisticated communication, computer and management infrastructures in the current smart grid, and proposes a multi-terminal unified power quality controller DC side voltage control device and method

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