Power grid frequency disturbance process wind storage coordination control method and system

A grid frequency and coordinated control technology, applied in engine control, wind turbine control, engine, etc., can solve problems such as wind turbine structural safety threats, large impact loads, etc., to improve grid-friendly characteristics, reduce impact loads and fatigue Effect of damage, optimized load design

Active Publication Date: 2021-08-06
SHANDONG UNIV +1
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Problems solved by technology

[0005] The inventors found that, on the one hand, the electromagnetic torque oscillation of the wind turbine generator excites the drive chain shafting or a certain order mode in the left and right direction of the tower to resonate, which in turn causes a large impact load, which will pose a threat to the structural safety of the wind turbine

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  • Power grid frequency disturbance process wind storage coordination control method and system
  • Power grid frequency disturbance process wind storage coordination control method and system
  • Power grid frequency disturbance process wind storage coordination control method and system

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Embodiment 1

[0066] The purpose of this embodiment is to provide a wind-storage coordinated control method in the grid frequency disturbance process.

[0067] Speed ​​and torque control is the core control strategy of wind turbines, which has a great impact on the load characteristics of the wind turbine. When the grid frequency is disturbed, the inertia of the system decreases, and the speed-torque characteristic is the link to coordinate the relationship between the unit's own power output and frequency modulation characteristics. This patent proposes an optimal control strategy for unit load during grid frequency disturbance with energy storage device. Through coordinated control of the speed and torque control strategy during grid frequency disturbance, while adopting the pitch angle reservation method, the energy storage device is released in a timely manner. The energy makes the mechanical system of the unit operate smoothly during the frequency disturbance process, and greatly reduc...

Embodiment 2

[0096] The purpose of this embodiment is to provide a wind-storage coordinated control system in the grid frequency disturbance process.

[0097] A wind storage coordinated control system for grid frequency disturbance process, comprising:

[0098] A data acquisition unit configured to acquire grid frequency data in real time and calculate the difference between the current grid frequency and the power frequency;

[0099] a disturbance pattern recognition unit configured to determine a current frequency disturbance pattern based on the difference;

[0100] The control unit is configured to adopt a control strategy based on pitch angle reservation according to different frequency disturbance modes, and consider the influence of the pitch rate on the load characteristics of the unit, and use the energy storage device to release electric energy. In further embodiments, there is also provided:

[0101] An electronic device includes a memory, a processor, and computer instruction...

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Abstract

The invention provides a power grid frequency disturbance process wind storage coordination control method and system. The method comprises the steps of obtaining power grid frequency data in real time, and calculating a difference value between a current power grid frequency and a power frequency, determining a current frequency disturbance mode based on the difference value, and according to different frequency disturbance modes, adopting a control strategy reserved based on a pitch angle, considering the influence of the variable pitch rate on the load characteristics of the unit, and using an energy storage device for releasing electric energy. The scheme makes full use of the advantages of convenient energy release, no time delay of power output, stable and controllable power output and the like of the energy storage device, cooperates with the primary frequency modulation control strategy of the wind turbine generator, achieves the purpose of reducing the impact load and fatigue damage of the shaft system, and has a great significance for optimizing the load design of the wind turbine generator, improving the power grid friendliness characteristic of the wind turbine generator and guaranteeing safe and stable operation of units and power grids.

Description

technical field [0001] The disclosure belongs to the technical field of wind-storage coordinated control, and in particular relates to a wind-storage coordinated control method and system during a power grid frequency disturbance process. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The penetration rate of wind power is getting higher and higher, the equivalent inertia of the power system is decreasing, and the frequency of grid disturbances will also be higher and higher. The problem of safe and stable operation of wind turbines caused by frequent impacts on the mechanical structure of wind turbines by grid disturbances will become increasingly prominent, and the safe and stable operation of wind turbines is facing major challenges. [0004] Since the wind turbine is connected to the grid in the traditional power electronic mode, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/28H02J3/38F03D7/00
CPCH02J3/241H02J3/28H02J3/38F03D7/00H02J2300/28F05B2270/328F05B2270/337Y02E10/72
Inventor 王瑞明丁磊付德义代林旺齐琛鲍威宇
Owner SHANDONG UNIV
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