A virtual inertia control method for wind farm battery energy storage system

A technology of battery energy storage system and virtual inertia, which is applied in the field of virtual inertia control of battery energy storage systems in wind farms, and can solve problems such as threats to the safe and stable operation of power systems and reduce system inertia

Active Publication Date: 2021-04-09
YANGJIANG POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
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Problems solved by technology

Most traditional wind turbines adopt the traditional maximum power point tracking control strategy and are connected to the grid through low-inertia power electronic equipment. The wind power generation system is almost decoupled from the grid, reducing the system inertia and making the wind farm hardly respond to frequency fluctuations in the grid. At the same time, the inherent randomness and volatility of wind power pose a threat to the safe and stable operation of the power system.

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  • A virtual inertia control method for wind farm battery energy storage system
  • A virtual inertia control method for wind farm battery energy storage system
  • A virtual inertia control method for wind farm battery energy storage system

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[0081] We use the proposed method to image 3 The system shown is verified. Active power fluctuations in the system mainly come from Figure 4 The fluctuating wind speed shown, the frequency fluctuation originates from the load sudden change in the system at 5 seconds. The method proposed in the present invention can be verified by comparing the power and frequency waveforms at the bus bar at the outlet of the wind field before and after implementing the proposed control strategy.

[0082] Adopt the inventive method to carry out simulation calculation to embodiment, the result is as follows:

[0083] Figure 5 The frequency fluctuation at the outlet bus of the wind field under different control strategies is given. where f noBESS is the frequency fluctuation at the busbar when the battery energy storage system is not used, f VI The frequency waveform at the busbar when the general virtual inertia control is used for the battery energy storage system, f VI (α, β) is the ...

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Abstract

The invention discloses a virtual inertia control method for a wind field battery energy storage system. This method first realizes the smoothing of the fluctuation of active power output by the wind field based on the general control strategy of the battery energy storage system; further, considering the influence of the system disturbance on the frequency, based on the rotor motion equation of the synchronous generator, a battery energy storage system providing inertia support is established The virtual inertia control model; finally, according to the relative size of the wind field frequency fluctuation, the virtual inertia control model is dynamically corrected, and the virtual inertia control strategy for the wind field battery energy storage system is obtained. Under the premise of ensuring the reliability of the system, the invention fully utilizes the characteristics of the battery energy storage system to absorb and release energy dynamically, and reduces the fluctuation of the system frequency while stabilizing the fluctuation of the output power of the wind field, thereby improving the safe and stable operation of the system. This control method can be used as an effective reference for smoothing the output fluctuation of the wind field and improving the inertia control of the wind field.

Description

technical field [0001] The invention relates to a virtual inertia control method, in particular to a virtual inertia control method for a wind field battery energy storage system. Background technique [0002] In order to promote the sustainable development of energy and environment, renewable energy such as wind energy has been widely used. As the penetration rate of wind power in the power system continues to increase, the problems brought about by the development of wind power are also emerging. Most traditional wind turbines adopt the traditional maximum power point tracking control strategy and are connected to the grid through low-inertia power electronic equipment. The wind power generation system is almost decoupled from the grid, reducing the system inertia and making the wind farm hardly respond to frequency fluctuations in the grid. At the same time, the inherent randomness and volatility of wind power pose a threat to the safe and stable operation of the power s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/32
CPCH02J3/24H02J3/32Y02E40/10
Inventor 刘俊磊刘思捷钟雅珊李震徐春华陈鹏彭孝强张韧
Owner YANGJIANG POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
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