Method for designing parameters of LC coupling type SVG (static var generators) in unbalanced power grids, and method and system for controlling LC coupling type SVG
A parameter design and coupling technology, applied in flexible AC transmission system, multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, etc., can solve the problem of unbalanced system negative sequence current and large capacitor voltage , lack of unbalanced control strategies, etc.
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[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0047] The main circuit system structure of LC coupled SVG (LC-SVG for short) is as follows: figure 1 As shown, compared with the traditional SVG, a capacitor C connected in series with the filter inductor L is added on the grid-connected branch. figure 1 Among them, the voltage source converter (VSC) adopts a typical two-level structure, u s is the power supply voltage of distribution network; u c is the fundamental wave component of the VSC inverter output voltage, and the load is resistive and inductive; i s i L and i c Respectively, grid side output current, load current and VSC output compensation current; U dc is the DC side capacitor C dc Voltage.
[0048] When the LC-SVG compensation device is used to realize reactive power and unbalanced load compensation, the compensation current that VSC needs to output includes positive sequence react...
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