A Fault Current Suppression Method of MMC AC Side Based on Virtual Impedance
A technology of AC side fault and virtual impedance, applied in the field of power transmission and distribution, can solve the problem of increasing the impedance of the outlet circuit of the secondary side valve of the transformer, and achieve the effect of suppressing the rising speed.
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[0009] A virtual impedance-based MMC AC side fault current suppression method involved in the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.
[0010] The technical problem to be solved by the present invention adopts the virtual impedance control strategy, based on the existing DQ decoupling control strategy, by adding the feedback link of the reactive power control amount on the Q axis, the system transfer function is corrected, and the feedback control is mapped to the primary system A virtual impedance parallel circuit is formed to equivalently increase the impedance of the valve outlet circuit on the secondary side of the transformer, thereby effectively suppressing the instantaneous rise rate of the AC current and the bridge arm current when the MMC AC side fails. The present invention adopts following technical scheme to...
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