Method and device for detecting power generation quality of wind power plant

Abstract

The invention relates to a method and a device for detecting the power generation quality of a wind power plant. The method comprises the following steps of respectively acquiring a voltage peak fluctuation value corresponding to sub / super-synchronous harmonic waves generated during grid connection of the wind power plant and a voltage content ratio of the sub / super-synchronous harmonic waves; and detecting the power generation quality of the wind power plant by using the voltage peak fluctuation value corresponding to the sub / super-synchronous harmonic waves generated during grid connection of the wind power plant and the voltage content of the sub / super-synchronous harmonic waves. According to the method, through derivation and calculation of voltage fluctuation caused by the sub / super-synchronous harmonics and the sub / super-step harmonic voltage content limit value, a new voltage quality quantification strategy index is provided for the voltage corresponding to the sub / super-synchronous harmonics generated by wind power plant grid connection, a voltage quality determination method is accurate, electric energy quality is guaranteed, and life practice is guided.

Description

technical field [0001] The invention relates to the technical field of new energy grid-connected system planning and operation, in particular to a method and device for detecting power generation quality of a wind farm. Background technique [0002] With the increase in the proportion of power electronic equipment such as wind power and HVDC, the content of sub / super synchronous harmonics in the power grid is gradually increasing. A sub / supersynchronous harmonic is a harmonic that is a non-integer multiple of the fundamental frequency. Such harmonics can be discrete or continuous. Sub- / super-synchronous harmonics will not only cause a series of problems such as the reduction of load power factor, the increase of energy loss, and the resonance with the power supply system like harmonics, but also lead to the deterioration of power quality and affect the safe and economic operation of the power grid. Compared with traditional harmonics, sub- / super-synchronous harmonics have a...

AI Technical Summary

Problems solved by technology

Sub- / super-synchronous harmonics will not only cause a series of problems such as the reduction of load power factor, the increase of energy loss, and the resonance with the power supply system like harmonics, but also lead to the deterioration of power quality and affect the safe and economic operation of the power grid

Compared with traditional harmonics, sub / super synchronous harmonics have a wider range of harm, resulting in changes in the effective value and peak value of the voltage waveform, causing flicker and causing power quality to exceed the standard

Currently, GB / T 24337–2009 is the only standard in the world that regulates sub / super-synchronous harmonics. This standard stipulates the allowable limits and measurement methods for sub- / super-synchronous harmonic voltages in public power grids. This standard applies to public power grids with a nominal voltage of 220kV and below, and is not suitable for the voltage level of wind farms connected to the power grid and the requirements for measurement accuracy

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