Wind farm harmonic evaluation prediction method

Abstract

The invention provides a wind farm harmonic evaluation prediction method. The method includes the following steps that: a mathematical model is established for individual wind turbine generator sets in a wind farm to be established, and the overall distribution condition of harmonic current of various orders which is outputted by the individual wind turbine generator sets under historical wind speed at a corresponding region can be obtained through utilizing the mathematical model, and a corresponding probability density function can be obtained through utilizing the least square fit; the historical data of harmonic current of an existing wind farm are put into statists, so that the overall distribution interval of harmonic phases of various orders or the discrete degree of the harmonic phases of various orders can be obtained, and therefore, a random model of the phases is established; and the amplitude and phase conditions of the harmonic current of the sets in the wind farm can be simulated according to the random model; amplitude and phase variation values of harmonic current brought by power transmission lines and transformers thereof are calculated according to a wind farm topologic structure diagram and a power transmission line and transformer harmonic model, so that the magnitude and phase angle of the harmonic current of various orders brought by the sets can be obtained, wherein the harmonic current is harmonic current which has not been aggregated to a main transformer; and harmonic phase superposition based on sector distribution is evaluated.

Description

technical field [0001] The invention relates to the field of wind farm harmonic prediction and evaluation, and more specifically, the invention relates to a novel wind farm harmonic prediction and evaluation method. Background technique [0002] As an inexhaustible clean and non-polluting renewable energy, wind energy has made the installed capacity of wind turbines in my country rise rapidly. At the same time, the installed capacity of wind farms is also increasing, and the impact on the system is becoming more and more obvious, which brings serious power quality problems of wind farms to the grid. [0003] With the rapid rise of power electronic equipment and the integration of large-capacity wind turbines into the power grid, the harmonic pollution of the power system caused by power electronic converter equipment will pose a certain threat to the safe and stable operation of the power grid and at the same time bring economic losses. . If the design of the wind farm con...

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Problems solved by technology

At the same time, the installed capacity of wind farms is also increasing, and the impact on the system is becoming more and more obvious, which brings serious power quality problems of wind farms to the grid.

[0003] With the rapid rise of power electronic equipment and the integration of large-capacity wind turbines into the power grid, the harmonic pollution of the power system c

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