Rapid control method for transformer tap of wind power plant pooling station

Abstract

The invention provides a rapid control method for transformer tap of a wind power plant pooling station. A wind power plant comprises a main boosting transformer and boosting transformers of a plurality of wind generating sets, wherein the boosting transformers are connected with the low-voltage side of the main boosting transformer. The method comprises the following steps: detecting a high-voltage bus voltage of the wind power plant pooling station in real time, and calculating a voltage rise rate or a voltage drop rate according to the high-voltage bus voltage; according to a comparison result between the high-voltage bus voltage and a preset threshold value and a comparison result between the voltage rise rate or the voltage drop rate and the preset threshold value, regulating an on-load voltage regulation tap of the main boosting transformer through a quick switch. According to the invention, the high-voltage and low-voltage ride-through capability of the fan in the wind power plant can be improved, and the probability of off-grid of the wind turbine generator caused by alternating-current system faults is reduced.

Description

technical field [0001] The invention belongs to the technical field of wind power generation grid connection, and in particular relates to a fast control method for a transformer tap of a wind farm collection station. Background technique [0002] In recent years, new energy installed capacity has achieved rapid development, and with the support of relevant national policies and industries, and in an environment where wind power and photovoltaic costs are gradually reduced, the advantages of new energy power generation have been further reflected. In the past ten years, the installed capacity of wind power has continued to increase, especially in some regions with developed wind resources. The installed capacity of wind power has shown an installed capacity of one million kilowatts or even tens of millions of kilowatts. Hybrid send, DC send. Under the situation of continuous improvement of wind power installed capacity, some new problems have emerged in wind power transmiss...

AI Technical Summary

Problems solved by technology

Risk of accidents increases as wind farms go offline on a large scale

However, when the wind power is sent out by AC-DC or DC transmission, when the DC transmission system has a blocking fault, the wind power sending end may have overvoltage problems, and the wind farm has insufficient high-voltage ride-through capability, resulting in a large-scale off-grid risk.

[0003] In recent years, Xinjiang, Inner Mongolia and other areas with relatively concentrated wind power resources in China have experienced large-scale off-grid accidents of wind turbines due to AC system failures, resulting in large economic losses. , Low voltage ride through ability improvement

The cost is huge and the economy is extremely low

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