A calculation method for grid-connected capacity limit of photovoltaic multi-infeed power system

Abstract

The invention discloses a grid-connected capacity limit calculation method of a photovoltaic multi-infeed power system. For the photovoltaic multi-infeed power system, the extended admittance matrix is ​​calculated, and the generalized short-circuit ratio and the generalized short-circuit ratio critical value of the photovoltaic multi-infeed power system are obtained; the absolute value of the difference between the generalized short-circuit ratio and the generalized short-circuit ratio critical value satisfies the given Set the threshold, calculate the sensitivity of the generalized short-circuit ratio of the photovoltaic multi-infeed power system to the rated capacity of each photovoltaic equipment, and fine-tune and increase the capacity of the photovoltaic equipment; recalculate the sensitivity, and adjust the rated capacity of the fan equipment again according to the sensitivity, and continue iterative processing to obtain capacity limit. The method of the invention has a clear calculation idea and a simple process, can obtain the maximum value of the grid-connected capacity of the photovoltaic multi-feed power system under the condition of a small disturbance stability margin, and provides guidance for the new construction and expansion of the photovoltaic power station from the perspective of small disturbance stability, which is helpful The comprehensiveness of power system planning and design considerations.

Description

Technical field [0001] The present invention belongs to the field of new energy planning and design, involving a method of calculating a power system capacity, and is specifically related to presenting a plurality of photovoltaic multi-feed power systems grid-network capacity limit calculation methods. Background technique [0002] With the intensification of the global energy crisis and the increasing environmental situation, the new energy unit represented by photovoltaic is gradually increased in the power system, and has become the trend of future energy development. However, different from the large-scale new energy access in Europe and the United States, the dispensing of energy, my country's energy load distribution is unbalanced, and there are many wells in the Northwest, far from the eastern load center, long-term existence of large-scale long-range transportation, high The proportional multi-Papo collection network has become an important trend in the future development...

AI Technical Summary

Problems solved by technology

Studies have shown that after the increasing photovoltaic grid-connected capacity is connected, the power system presents a significant power electronic characteristic, which is prone to small disturbance stability problems, which restricts the grid-connected scale of new energy units

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