Electric power system secondary frequency modulation method based on DFIG and synchronous generator

A technology for synchronous generators and power systems, applied in wind power generation, electrical components, circuit devices, etc., can solve the problems of inability to change secondary regulation, inability to provide active power support, low overall coordination between renewable energy and power grids, and achieve The effect of reducing wind curtailment and reducing frequency regulation pressure

Inactive Publication Date: 2018-02-02
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, renewable power sources generally have the characteristics of volatility and intermittency, which makes the overall coordination between renewable energy sources and the power grid low; and under traditional control methods, renewable power sources generally operate at the maximum power tracking point, which cannot be controlled at the system frequency. Provide active power support during fluctuations, let alone change the power-frequency characteristic curve to participate in the secondary adjustment of the system frequency

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  • Electric power system secondary frequency modulation method based on DFIG and synchronous generator
  • Electric power system secondary frequency modulation method based on DFIG and synchronous generator
  • Electric power system secondary frequency modulation method based on DFIG and synchronous generator

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Embodiment Construction

[0023] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the implementations shown and described in the drawings are only exemplary, intended to explain the principle and spirit of the present invention, rather than limit the scope of the present invention.

[0024] The embodiment of the present invention provides a power system secondary frequency regulation method based on DFIG and synchronous generator, such as figure 1 As shown, including the following steps S1-S10:

[0025] S1. Measure the frequency of the power system and calculate the frequency deviation Δf of the synchronous generator. The calculation formula is: Δf=f-f N , where f is the measured frequency of the power system, f N is the rated frequency of the power system.

[0026] S2. Measure the tie-line power of the power system and calculate the net exchange power ΔP of the tie-line T , the calculation formu...

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Abstract

The invention discloses an electric power system secondary frequency modulation method based on DFIG and a synchronous generator. According to a synchronous generator frequency deviation, a connectingline net exchange power and a wind power predication error, an ACE value of a power grid is calculated, and furthermore the active power adjustment amount of each modulated frequency is distributed according to a wind power field and synchronous generator secondary frequency modulation adjustment participation coefficient, thereby realizing coordinated secondary frequency modulation control between DFIG and the synchronous generator. According to the electric power system secondary frequency modulation method, based on traditional power grid AGC controlling, influence of the wind power predication error to the magnitude of ACE is considered, and active standby of the wind power field is taken into the power grid secondary frequency modulation. Based on the traditional secondary frequencymodulation, a secondary frequency modulation adjustment coefficient of the wind power field is defined so that coordinated secondary frequency modulation control of the DFIG and the synchronous generator is realized.

Description

technical field [0001] The invention belongs to the technical field of power system frequency modulation control, and in particular relates to the design of a power system secondary frequency modulation method based on DFIG and a synchronous generator. Background technique [0002] The development of renewable energy is a major measure to improve my country's energy structure, promote environmental protection, and maintain sustainable social and economic development. However, renewable power sources generally have the characteristics of volatility and intermittency, which makes the overall coordination between renewable energy sources and the power grid low; and under traditional control methods, renewable power sources generally operate at the maximum power tracking point, which cannot be controlled at the system frequency. Active power support is provided during fluctuations, and the power-frequency characteristic curve cannot be changed to participate in the secondary adj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/38
CPCH02J3/386H02J3/48Y02E10/76
Inventor 马宁宁张晨曦王德林范林源蔡瑞清
Owner SOUTHWEST JIAOTONG UNIV
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