A Harmonic Control Method Between Wind Power Gathering Stations

A technology of wind power collection and harmonic control, applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems affecting the safety and stability of the power grid, thermal power unit safety, overcut response speed, and failure to achieve online real-time Control and other issues to achieve the effect of avoiding a large number of overcut wind turbines
CN105896541BActive Publication Date: 2018-03-30STATE GRID XINJIANG ELECTRIC POWER CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID XINJIANG ELECTRIC POWER CORP
Publication Date
2018-03-30

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Abstract

The present invention discloses an inter-harmonics control method in a wind power collection station. The method comprises that an inter-harmonic signal extraction module carries out spectral analysis on a tie line current from the wind power collection station to a main network, calculates frequency fc of a harmonic component with the maximum amplitude, and extracts inter-harmonic signals in a tie line voltage and each wind power farm current; a wind power farm that is allowed to be cut in the collection station is determined according to the tie line inter-harmonic current, the inter-harmonic voltage, and the wind power farm inter-harmonic current; absolute values of difference values between the fc and a set of characteristic frequencies are calculated, and a minimum value dfmin among the absolute values is solved; and a sub-round and level-to-level cutting module cuts each wind power farm that is allowed to be cut in a series of rounds and level by level according to the tie line inter-harmonic current, the dfmin, and the wind power farm inter-harmonic current. According to the method disclosed by the present invention, the tie line between the wind power collection station and the main network, and each wind power farm can be monitored simultaneously, the relatively large inter-harmonic current existing in the power grid can be online monitored in real time, and whether there is an inter-harmonic generation source in the wind power collection station can be online determined in real time.
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Description

technical field

[0001] The invention relates to the field of electric power control, in particular to a method for controlling harmonics between wind power collection stations. Background technique

[0002] With the rapid economic growth and the rapid development of high energy-consuming industries, the demand for renewable new energy is becoming more and more urgent. In recent years, with the increasing maturity of wind power and photovoltaic power generation technologies, the cost of power generation has also gradually decreased, and large-scale commercial operation of wind power and photovoltaic power has become possible. By 2020, the installed capacity ratio of non-fossil energy and fossil energy in China will be about 4:6. , the installed capacity of wind power and solar power generation reached about 300 million kilowatts, with an increase of about 180 million kilowatts; China's large-scale wind and solar energy development areas are generally at the end of the power g...

Claims

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