A wind power frequency regulation method and system considering multi-link coordinated control

Abstract

The invention discloses a wind power frequency modulation method and system considering multi-link cooperative control, including: constructing a mapping equivalent model of the fan operating point and the frequency modulation control link parameters according to the net rotation energy storage power and load shedding reserve power of the fan, and at different wind speeds Under working conditions, adjust the wind turbine pitch angle load shedding and virtual inertia response parameters according to the mapping equivalent model; judge the current frequency modulation control link of the wind turbine according to the frequency deviation and frequency change rate of the wind turbine, and control the natural wind turbine according to the judgment result Adjust the control parameters of the fan to control the output torque of the fan. Using the correspondence between wind turbine rotor kinetic energy, pitch angle load shedding, virtual inertia and primary frequency modulation energy, a mapping equivalent model of wind turbine frequency modulation control parameters and operating points is proposed; based on fuzzy logic algorithm, a dynamic adjustment algorithm for wind turbine inherent control links is proposed. Realize the frequency modulation control strategy of the coordinated cooperation of the wind turbine operating point, the wind turbine inherent control and the parameters of the frequency modulation control link.

Description

technical field [0001] The present invention relates to the technical field of frequency regulation of wind turbines, in particular to a wind power frequency regulation method and system considering multi-link coordinated control. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Wind turbines participate in grid connection through power electronic interfaces, and the decoupling characteristics between rotor speed and system frequency prevent wind turbines from responding spontaneously to changes in grid frequency like synchronous generators. The large-scale connection of wind turbines causes the system inertia level to drop, which weakens the system's anti-interference ability and frequency modulation ability. [0004] Based on the output characteristics of wind turbines, domestic and foreign scholars and industrial circles have proposed a...

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Problems solved by technology

The research focus of the above method is on the dynamic adjustment of the control parameters of the additional inertial control link, without considering the influence of the inherent control structure of the fan on the frequency modulation output characteristics

Based on this, the existing literature finds that the existence of the speed controller has an impact on the equivalent inertia time constant in the calculation of the equivalent inertia time constant of the wind farm; the effective extraction of rotor kinetic energy is achieved by blocking the output of the speed controller during frequency modulation; Research on the timing of wind turbine frequency modulation withdrawal to improve the stability of the wind farm, but the speed controller lock-up will easily lead to excessive release of rotor kinetic energy, and the sudden change of active torque caused by the moment the wind turbine exits frequency modulation may easily cause a secondary drop in system frequency

[0006] In summary, the frequency modulation characteristics of double-fed fans are jointly determined by the current operating point of the fan, the inherent control links of the fan, and the frequency modulation control parameters, while the traditional method generally focuses on one link, without comprehensive consideration of multiple links

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