Chain SVG device with active filter function

Abstract

The invention discloses a chain SVG device with an active filter function, which comprises a control unit, three active power modules, a plurality of passive power modules and a grid-connected transformer. Three phases of the chain SVG device adopt a Y type or a delta type to be connected onto the power grid via an isolation transformer. The active filter function of the chain SVG device is realized in a way in which a harmonic current controller in an integrated compensation controller generates modulation waves containing corresponding harmonic elements, and voltage containing the corresponding harmonic elements is outputted via the active power modules. The reactive power compensation function is realized in a way in which a reactive power current controller in the integrated compensation controller generates modulation waves only containing fundamental wave elements, and all power modules are serially connected to output the fundamental wave voltage. One device has the reactive power compensation function and the active filter function at the same time, and the problems that the prior electric energy treatment device is high in cost, the device is complicated, and reliability is high can be solved.

Description

technical field [0001] The invention relates to a chained SVG device with an active filter function, belonging to the technical field of electric energy management. Background technique [0002] In the power system, the wide application of various large-capacity electrical equipment such as rolling mills, electric arc furnaces, hoists, and electric locomotives has brought about a series of problems such as voltage fluctuations, three-phase unbalance, low power factor, and voltage harmonics. Power quality issues. Especially in recent years, large-scale wind power, photovoltaic and other new energy power are connected to the grid, which poses a challenge to the voltage stability of the power system. In this context, reactive power compensation devices and harmonic compensation devices gradually appeared and quickly entered the market, which played a positive role in solving power quality problems and improving the reliability of power systems. At present, the reactive power ...

AI Technical Summary

Problems solved by technology

image 3 This is the schematic diagram of the active filter APF device. The APF device uses a fully-controlled power semiconductor device, which can realize the current harmonic compensation function within the 25th order, and has a reactive power compensation function, but is limited by the internal pressure capability of the power semiconductor device. APF devices can only be used in 380V systems, and cannot be directly connected to 10kV or higher voltage grids, and their capacity is limited

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