Method for determining the short-circuit capacity of collector lines and busbars in wind farms

Abstract

An embodiment of the present invention provides a method for determining the short-circuit capacity of a collector line busbar in a wind farm. The determination method includes: obtaining the voltage value when the reactive power of the grid-connected bus test point is zero, and at least two groups of reactive power values ​​and their corresponding voltage values; according to the reactive power compensation relationship of the wind farm, the reactive power The voltage value when the power is zero and at least two sets of reactive power values ​​and their corresponding voltage values ​​are used to obtain the short-circuit capacity of the grid-connected bus; according to the primary system structure of the wind farm, based on the short-circuit capacity of the grid-connected bus, the short-circuit capacity of the collecting line bus is calculated . Through the method for determining the short-circuit capacity of the collecting line bus of the wind farm in the present invention, it is possible to accurately and dynamically test the short-circuit capacity of the bus, thereby providing a basis for judging the strength of the access system of the wind farm, and at the same time providing compensation for wind turbines and reactive power It provides a reference basis for the adjustment of the control parameters of the device.

Description

[0001] This application is a divisional application with the application number CN201610086362.6 and the title of the invention is busbar short-circuit capacity test method, device and system. technical field [0002] The invention relates to the technical field of wind power, in particular to a method for determining the short-circuit capacity of a collector line and busbar of a wind farm. Background technique [0003] In recent years, my country's wind power technology has always maintained a rapid and large-scale development trend, and plans to build tens of millions of kilowatt-level wind power bases in Northwest China, Inner Mongolia and other places. The construction of large-scale wind power bases and large-scale wind farms has more requirements for the capacity of the power grid and the strength of the power grid. Among them, the operating short-circuit capacity is an important parameter to characterize the operating characteristics of the power system, and the size ...

AI Technical Summary

Problems solved by technology

However, the above four methods have the following disadvantages: First, for the static estimation method, the reference system impedance is only issued once a year, which is static, while the actual system impedance is dynamic, and the accuracy of this estimation method is not good. Second, for the prediction method based on neural network, the amount of calculation is large, and the model training process is not easy to grasp; third, it is difficult to realize real-time monitoring under normal operating conditions by using the large-load disturbance simulation measurement method; fourth, using Thevenin's theorem and investment The cut capacitance estimation method is a theoretical calculation, not very practical

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