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Wind turbine generator primary frequency modulation control strategy considering delay support

A control strategy and technology of wind turbines, applied in wind power generation, electrical components, circuit devices, etc., to achieve the effect of raising the lowest point of frequency, increasing output, and avoiding the secondary drop of grid frequency

Active Publication Date: 2021-09-03
NANJING UNIV OF SCI & TECH
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  • Wind turbine generator primary frequency modulation control strategy considering delay support
  • Wind turbine generator primary frequency modulation control strategy considering delay support
  • Wind turbine generator primary frequency modulation control strategy considering delay support

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Embodiment

[0068] Use the open source professional wind turbine simulation software FAST (Fatigue, Aerodynamics, Structures, and Turbulence) provided by the National Renewable Energy Laboratory (NREL) of the US Department of Energy to simulate the control effect. The wind turbine model adopts the 600kW CART3 test model developed by NERL, and the specific parameters are shown in Table 1.

[0069] Table 1 Main parameters of NREL 600kW CART3 wind turbine

[0070]

[0071] The principle block diagram of the wind turbine primary frequency modulation control strategy considering the delay support is as follows: figure 2 As shown, it mainly includes two control modules: the optimal delay time calculation module and the frequency modulation module.

[0072] Optimal delay time calculation module: when the power system is in a steady state, the known T R , R, ω n , ξ and other system parameters and K 0 , ω w , J and other fan control / state parameters, according to (1), formula (5) and for...

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Abstract

The invention discloses a wind turbine generator primary frequency modulation control strategy considering delay support. In order to solve the problem that a wind turbine generator releases frequency modulation kinetic energy too early at the initial stage of frequency response to cause poor subsequent improvement effect on a lowest frequency point, the method is based on a suboptimal power curve method. By adjusting the starting time of the wind turbine generator for providing active support for a power grid, the invention finds that the lowest frequency point can be improved by enabling the wind turbine generator to properly delay to participate in primary frequency modulation. On the basis of superposition of a linear system and a principle of enabling the output of the wind turbine generator to perform power compensation on the lowest point of the frequency to the maximum degree, an estimation method of the optimal delay time of the wind turbine generator is provided, and then the fan primary frequency modulation control strategy considering delay support is designed. On the premise of not changing the frequency modulation control structure of the system, the output cooperation of the wind turbine generator and the synchronous machine is enhanced, and the improvement effect on the lowest point of the frequency is improved.

Description

technical field [0001] The invention belongs to the field of power system frequency regulation, and in particular relates to a primary frequency regulation control strategy of a wind turbine considering delayed support. Background technique [0002] With the continuous increase of wind power grid-connected scale, in order to ensure the frequency quality and stable operation of the grid, it is urgent for wind power to participate in the primary frequency regulation of the grid. The primary frequency modulation control based on the kinetic energy release of the wind wheel that is widely used at this stage mainly includes the following categories: virtual inertia control, droop control, integrated inertia control and step inertia control. This type of control has the characteristics of fast response, applicable to full wind speed and high power generation efficiency, but there are generally problems of limited kinetic energy available for wind turbines and short active power su...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/241H02J3/381H02J3/002H02J2300/28H02J2203/10Y02E10/76
Inventor 殷明慧向真顾伟陈载宇周连俊卜京邹云谢云云蔡晨晓
Owner NANJING UNIV OF SCI & TECH
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