A method and device for analyzing dynamic characteristics of a photovoltaic power generation system

Abstract

The invention provides a method and device for analyzing the dynamic characteristics of a photovoltaic power generation system. The method includes obtaining the positive-sequence synchronous phase angle of the power grid and the negative-sequence phase angle of the power grid; calculating the injection current command; calculating the operating characteristic index of the photovoltaic power generation system; the device It includes a vector transformation module, a positive and negative double-sequence full digital phase-locked loop, a current calculation module and a dynamic characteristic analysis module. Compared with the prior art, the method and device for analyzing the dynamic characteristics of a photovoltaic power generation system provided by the present invention have the function of positive / negative sequence decoupling and blocking, and can perform positive / negative sequence blocking under serious faults, reflecting the effect of inertia increase , and can also more comprehensively obtain the dynamic characteristics of the photovoltaic power generation system when the grid is symmetrical / asymmetrical.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a method for acquiring dynamic characteristics of a photovoltaic power generation system. Background technique [0002] As the scale of photovoltaic power generation access to the grid continues to increase, its impact on the grid has received extensive attention and research. Recently, one of the main trends in the development of photovoltaic power generation technology is the study of the overall operating characteristics of photovoltaic power generation systems. The focus has shifted from the study of operating characteristics under normal grid conditions to the research of non-off-grid or ride-through operating characteristics under grid fault conditions. At present, based on the research on the operating characteristics of photovoltaic power generation systems at home and abroad, several dynamic models suitable for power grid simulation analysis have been...

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Problems solved by technology

Since the above models do not consider the negative sequence network, they cannot fully reflect the dynamic characteristics of the photovoltaic power generation system when the grid voltage is unbalanced or asymmetrical.

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