Frequency control method considering kinetic energy throughput capacity of double-fed fan

A technology of frequency control and throughput capability, applied in energy reserve, AC network circuit, reduction of greenhouse gases, etc., to improve frequency stability, avoid starting pitch angle control, and improve the ability of wind turbines to connect to the grid

Pending Publication Date: 2020-09-29
NANTONG UNIVERSITY
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  • Abstract
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Problems solved by technology

Therefore, with the change of the system structure of the power system and the continuous grid connection of wind power, the grid frequency stability is bound to face huge challenges

Method used

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  • Frequency control method considering kinetic energy throughput capacity of double-fed fan
  • Frequency control method considering kinetic energy throughput capacity of double-fed fan
  • Frequency control method considering kinetic energy throughput capacity of double-fed fan

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings for further explanation, so that those skilled in the art can understand the present invention more deeply and can implement it, but the following examples are only used to explain the present invention, not as the present invention limit.

[0039] Such as figure 1 As shown, a frequency control method that takes into account the handling capacity of doubly-fed wind turbines includes the following steps: S1: Calculate the instantaneous frequency of the system grid according to the voltage at the public coupling point between the wind farm and the grid. When the instantaneous frequency of the grid exceeds the set dead zone range, start the system frequency control of the fan; if it is within the set dead zone range, continue to work under the maximum power tracking control; S2: Calculate the system frequency deviation Δf according to the instantaneous frequency of the pow...

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Abstract

The invention particularly relates to a frequency control method considering the kinetic energy throughput capacity of a doubly-fed fan. Frequency control is carried out when frequency deviation is positive and negative; when the frequency deviation is positive, redundant active power is absorbed from a power grid and stored in a fan, so active power redundancy of the system is reduced; when the frequency deviation is negative, kinetic energy is effectively released into the power grid from a rotating part of the fan, and the active power shortage of the system is compensated; therefore, active frequency control of the doubly-fed wind generating set is realized, frequency stability is improved, and the response time is provided for a synchronous generator to participate in system frequencymodulation. Different frequency control parameters are adopted to provide system frequency support capability; the proposed frequency control parameters can make full use of the capacity of the fan for storing and releasing the rotational kinetic energy to perform frequency control; when the frequency deviation is negative, the proposed control parameters can prevent the fan from stalling; and when the frequency deviation is positive, the provided control parameters can avoid excessive starting pitch angle control, and a problem of mechanical fatigue of the fan is reduced.

Description

technical field [0001] The invention specifically relates to a frequency control method considering the kinetic energy handling capacity of a doubly-fed wind turbine, and belongs to the technical field of wind power generation control. Background technique [0002] With the increasing wind power grid-connected capacity, traditional synchronous generators are constantly being replaced by wind turbines. However, the inherent intermittent, random and fluctuating characteristics of wind energy have brought great challenges to the safe operation of power systems. Doubly-fed wind turbine is the most widely used type of wind turbine in the market; although this type of unit has the advantages of high efficiency and advanced control technology; As a result, there is no coupling relationship between the rotor speed and the system frequency, which reduces the system's rotational inertia and system frequency modulation capability, and causes the frequency deviation to easily exceed the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/38H02J3/28
CPCH02J3/48H02J3/381H02J3/28H02J2300/28Y02E70/30
Inventor 杨德健张雷张新松华亮
Owner NANTONG UNIVERSITY
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