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Author

Shen Yaqi

Bio: Shen Yaqi is an academic researcher. The author has contributed to research in topics: Voltage & Oscillation. The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

Papers
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Patent
08 Nov 2019
TL;DR: In this paper, a system and a method for positioning oscillating source of a wind power grid-connected system based on an energy frequency spectrum, belongs to the technical field of wind power generation systems, and solves the problem that an oscillation source unit cannot be accurately positioned under the condition that a system is interfered and a multioscillation mode is excited.
Abstract: The invention relates to a system and a method for positioning oscillating source of a wind power grid-connected system based on an energy frequency spectrum, belongs to the technical field of wind power generation systems, and solves the problem that an oscillating source unit cannot be accurately positioned under the condition that a system is interfered and a multi-oscillation mode is excited.The method comprises the following steps of 1, acquiring voltage and current information of an output port of each unit of a system, and obtaining a change curve of the dynamic energy of each generator set along with time; 2, taking the generator set corresponding to the curve with a rising trend as an alternative unit; 3, acquiring and processing energy spectra of a synchronous unit and a doubly-fed wind turbine generator with the phase-locked loop in the alternative unit and/or an energy-like frequency spectrum of a doubly-fed wind turbine generator with the virtual inertia, and taking the unit with the largest dominant oscillation mode as an oscillation source reference unit; and 4, calculating energy spectrum similarity coefficient of each other alternative unit and the oscillation source reference unit to determine an oscillation source unit. According to the system and the method, accurate positioning of the oscillation source unit can be realized under the condition that the system is interfered and the multi-oscillation mode is excited.

2 citations


Cited by
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Patent
21 Feb 2020
TL;DR: In this paper, a wind power plant available inertia evaluation method is presented, which comprises the steps of constructing an instantaneous wind speed conditional probability distribution model under the influence of atmospheric turbulence by utilizing a hybrid Copula function based on the space-time distribution characteristic of the average wind speed of a wind field under influence of physical factors; establishing an estimation model of available inertia kinetic energy and inertia power increment of a fan in an operation mode under virtual inertia control of a doubly-fed wind turbine generator, and obtaining an interval evaluation curve of a whole wind field based on a certain confidence
Abstract: The invention discloses a wind power plant available inertia evaluation method, which comprises the steps of constructing an instantaneous wind speed conditional probability distribution model under the influence of atmospheric turbulence by utilizing a hybrid Copula function based on the space-time distribution characteristic of the average wind speed of a wind field under the influence of physical factors; establishing an estimation model of available inertia kinetic energy and inertia power increment of a fan in an operation mode under virtual inertia control of a doubly-fed wind turbine generator, and obtaining an interval evaluation curve of available inertia of a whole wind field based on a certain confidence coefficient by additionally considering the operation condition of each fanin the wind field in actual operation. The confidence interval evaluation result provided by the invention is relatively small in error and relatively high in credibility.
Patent
02 Feb 2021
TL;DR: In this article, a wind power grid-connected frequency response abnormity monitoring method and a system is presented. But the method comprises the following steps: obtaining a frequency response curve of a windpower grid connected system; according to a pre-trained frequency response anomaly identification model, identifying whether an anomaly exists in the frequency response or not; if the frequencyresponse curve is abnormal, performing anomaly detection on a plurality of wind driven generators of the wind turbine generator in sequence, recognizing the abnormal wind-driven generators, executingthe system anomaly response emergency measures at the same time, and otherwise
Abstract: The invention provides a wind power grid-connected frequency response abnormity monitoring method and a system. The method comprises the following steps: obtaining a frequency response curve of a windpower grid-connected system; according to a pre-trained frequency response anomaly identification model, identifying whether an anomaly exists in the frequency response curve or not; if the frequencyresponse curve is abnormal, performing anomaly detection on a plurality of wind driven generators of the wind turbine generator in sequence, recognizing the abnormal wind driven generators, executingthe system anomaly response emergency measures at the same time, and otherwise, continuously recognizing whether anomaly exists in the frequency response curve or not; and withdrawing the abnormal wind driven generator in the wind power grid-connected system. According to the invention, anomaly detection is carried out on the wind power grid-connected frequency response, specific fault equipmentis detected, the fault equipment is maintained, the anomaly detection efficiency is relatively high, and the abnormal frequency is regulated and controlled in time, so that the system frequency response returns to normal.