Control method and control device for suppression of resonance of grid-connected power generation system

Abstract

The invention provides a control method and a control device for suppression of resonance of a grid-connected power generation system. The control method includes: detecting PCC voltage of a PCC point of the grid-connected power generation system in real time, processing the PCC voltage to acquire an effective resonance amplitude value thereof, comparing the effective resonance amplitude with a preset resonance threshold value, judging whether the grid-connected power generation system is in resonance or not according to a comparison result, if so, then determining a current correction according to the effective resonance amplitude value and the resonance threshold value, sending the current correction to each inverter to allow the inverter to adjust parameter according to the current correction until detecting that the effective resonance amplitude value of the PCC voltage of the PCC point is smaller than the resonance threshold value. Therefore, suppression of resonance of the grid-connected power generation system is achieved and stable and reliable running of the grid-connected power generation system and a power grid is guaranteed.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, and more specifically, to a control method and device for suppressing resonance of a grid-connected power generation system. Background technique [0002] In the development of new energy, with the grid-connected power generation of new energy such as solar cells, wind power and fuel cells becoming more and more popular, grid-connected inverter power generation technology has become an important research direction. It is found through research that with the increase of the number of inverters in the grid-connected power generation system, the stability of the grid-connected power generation system will decrease, especially the commonly used inverters with LCL filters, which are easy to cause The resonance of the grid-connected power generation system with multiple inverters poses severe challenges to the stable and reliable operation of the grid-connected power generation syst...

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Problems solved by technology

[0004] In view of this, the present invention provides a control method and device for suppressing the resonance of a grid-connected power generation system, which solves the problem that the existing active source damping method cannot reliably suppress the resonance of a grid-connected power generation system with multiple inverters, and thus cannot Technical issues to ensure the stable and reliable operation of the grid-connected power generation system and the grid

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