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Primary frequency modulation method and system for tracking sub-optimal power coefficient of doubly-fed wind turbines

A doubly-fed wind turbine, optimal power technology, applied in the control of wind turbines, wind energy power generation, wind turbines, etc., can solve problems such as poor system frequency stability, and achieve the effect of suppressing frequency changes and improving stability

Active Publication Date: 2019-05-28
ZHEJIANG WINDEY
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Problems solved by technology

[0005] In order to overcome the shortcomings of poor system frequency stability of the existing doubly-fed wind turbine control mode, the present invention provides a method and system for primary frequency regulation of doubly-fed wind turbines based on tracking sub-optimal power coefficients to improve system frequency stability

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  • Primary frequency modulation method and system for tracking sub-optimal power coefficient of doubly-fed wind turbines
  • Primary frequency modulation method and system for tracking sub-optimal power coefficient of doubly-fed wind turbines
  • Primary frequency modulation method and system for tracking sub-optimal power coefficient of doubly-fed wind turbines

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] refer to Figure 1 to Figure 4 , a primary frequency modulation method for doubly-fed wind turbines based on tracking sub-optimal power coefficients, including the following steps:

[0036] 1) Current power coefficient C p calculation

[0037] According to the current impeller speed and wind speed, calculate the current tip speed ratio λ, according to figure 2 C in p -λ curve, assuming figure 2 Point A in is the current power coefficient C p , the corresponding active power is image 3 point A1;

[0038] 2) New power factor calculation

[0039] Assuming that the reserved energy is set to ΔP, then by:

[0040]

[0041] get new power factor for:

[0042]

[0043] The power factor decreases, figure 2 The medium power coefficient gradually transitions from point A to point B, and the corresponding tip speed ratio increases from λ to

[004...

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Abstract

The invention discloses a primary frequency modulation method based on tracking of a sub-optimal power coefficient for a double-fed wind generator. The method comprises the following steps: 1) determining a current power coefficient C; 2) calculating a new power coefficient C-tilde; 3) calculating a new target rotating speed; and 4) detecting a system frequency in real time, calculating a deviation value, and when the system frequency is changed, calculating energy needing to be released according to a frequency deviation value deltaf and a current running condition of a fan, repeating the calculations from the step 2) to the step 4), controlling a rotating speed of the fan, increasing the power coefficient to an optimal value, and increasing active power of the generator. The invention also provides a primary frequency modulation system based on tracking of the sub-optimal power coefficient for the double-fed wind generator. Through adoption of the primary frequency modulation method and system based on the tracking of the sub-optimal power coefficient for the double-fed wind generator, the system frequency stability is enhanced.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method and system for primary frequency regulation of a doubly-fed wind turbine, so as to improve the stability of the system frequency. Background technique [0002] The conventional synchronous generator rotor speed is directly coupled with the system frequency. When the system frequency in the region changes, it can directly respond to the frequency change of the system. The frequency response includes inertia response, primary frequency modulation, and secondary frequency modulation. These three frequency control The methods complement each other and improve the frequency stability of the power system by changing the power generation. [0003] At present, doubly-fed wind turbines have become the main model of large-scale wind farms. However, while the maximum power tracking control is realized based on the converter, there is no coupling relationship between t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/48H02J3/38F03D7/00
CPCF03D7/00F05B2270/101F05B2270/20H02J3/386H02J3/48Y02E10/72Y02E10/76
Inventor 应有李照霞孙勇杨靖许国东
Owner ZHEJIANG WINDEY
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