New energy cluster multi-station short circuit ratio calculation method and system

Abstract

The invention provides a new energy cluster multi-station short-circuit ratio calculation method and system. The method comprises the following steps: acquiring current and voltage injected into a power grid by each new energy station; analyzing the voltage influence between the new energy stations based on the current and voltage injected into the power grid by the new energy stations to obtain a voltage interaction influence coefficient; calculating the short-circuit capacity of the machine end bus of the new energy station based on the current and voltage injected into the power grid by each new energy station; and calculating the new energy multi-station short-circuit ratio based on the voltage interaction influence coefficient and the machine-end bus short-circuit capacity in combination with a new energy multi-station short-circuit ratio calculation formula. According to the method, the mutual influence among the new energy stations is considered, so that the calculated short-circuit ratio is more accurate.

Description

technical field [0001] The invention relates to the field of new energy power generation technology and power systems, in particular to a method and system for calculating the short-circuit ratio of multiple stations in a new energy cluster. Background technique [0002] New energy such as wind power and photovoltaics is the main development mode of new energy. Areas with concentrated new energy development generally have few conventional power sources, weak voltage and frequency support, and the stability problems caused by large-scale new energy development are prominent, including transient overvoltage and broadband oscillation. Studies have shown that the occurrence of these problems has a great relationship with the grid strength of new energy grid-connected points. The weaker the grid strength, the greater the risk of overvoltage, oscillation and other stability problems. [0003] The short-circuit ratio is an important indicator to measure the power grid strength of ...

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Problems solved by technology

[0004] In order to solve the problem that the existing technology mainly calculates the short-circuit ratio of a single device, but only evaluates a single device separately, the evaluation results are too optimistic and one-sided, resulting in low accuracy in measuring the real strength of the grid-connected point of the new energy unit, the present invention proposes a New energy cluster multi-site short-circuit ratio calculation method, including:

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