Multi-objective optimal control method for doubly-fed fan participating in system frequency modulation

A multi-objective optimization, doubly-fed fan technology, applied in the direction of reducing/preventing power oscillation, to ensure safety, maintain stability, and reduce secondary drops

Inactive Publication Date: 2019-11-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0007] In view of the lack of focus on the analysis of the secondary drop of the system frequency and the recovery time for speed recovery when exiting the primary frequency regulation control in the prior art, the purpose of the present invention is to provide a multi-objective system for double-fed fans to participate in system frequency regulation Optimal control method

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  • Multi-objective optimal control method for doubly-fed fan participating in system frequency modulation
  • Multi-objective optimal control method for doubly-fed fan participating in system frequency modulation
  • Multi-objective optimal control method for doubly-fed fan participating in system frequency modulation

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specific Embodiment

[0069] Constructing a simulation system consisting of a conventional synchronous unit (250MVA / 13.8kV) and a certain type of wind power virtual synchronous machine (2MW / 690V×31) for simulation analysis, combining the above-mentioned parameter optimization method includes the following steps:

[0070] Step 1. Maximum power tracking strategy for speed recovery

[0071] In the system simulation model constructed including the wind power virtual synchronous machine and the conventional synchronous unit, the frequency drop problem of the wind power virtual synchronous machine based on the rotor inertia control is simulated, as shown in Figure 4 As shown, the classic MPPT recovery method is used for system frequency modulation and the frequency change of wind power not participating in system frequency modulation is studied and verified.

[0072] Step 2. Optimal design of variable power curve

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Abstract

The invention provides a multi-objective optimal control method for a doubly-fed fan participating in system frequency modulation. The method comprises the steps: rotation speed recovery of a wind power generator based on the maximum power tracking strategy; design a variable power curve; and performing parameter optimization of the variable power curve based on a Pareto algorithm. According to the technical scheme, the multi-objective optimization of the rotating speed recovery process can be realized, the secondary fall of the frequency and the rotating speed recovery time can be reduced, the operation stability of the wind power generation system can be improved and the operation life can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of wind power generation systems, and in particular relates to a multi-objective optimal control method for double-fed wind turbines participating in system frequency modulation. Background technique [0002] Wind energy has many advantages such as cleanness, wide sources, and renewable. Wind power generation has become one of the most potential new energy generation methods at present. With the large-scale grid connection of wind power, the stability of grid frequency is facing increasingly severe challenges. On the one hand, due to the application of doubly-fed asynchronous generators, power and frequency are completely decoupled, resulting in wind turbines being unable to track frequency fluctuations in time, and the equivalent inertia of the system is 0; on the other hand, wind turbines generally adopt maximum power tracking control strategy , unable to provide additional active power to cope with fluct...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 林忠伟陈振宇曲晨志刘瑞王瑞田
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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