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Virtual synchronous generator control method based on inertia and damping self-adaption

A technology of generator control and virtual synchronization, applied in electrical components, output power conversion devices, and non-reversible DC power input into AC power output in equal directions

Pending Publication Date: 2021-05-18
CHINA UNIV OF MINING & TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many existing studies are limited to the simulation of synchronous generators, and provide superior flexibility for systems considering inverter control

Method used

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  • Virtual synchronous generator control method based on inertia and damping self-adaption
  • Virtual synchronous generator control method based on inertia and damping self-adaption
  • Virtual synchronous generator control method based on inertia and damping self-adaption

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and example technical scheme of the present invention is described further:

[0022] Such as figure 1 Shown is the angular frequency oscillation curve of the synchronous generator. After the system is disturbed, within the time period 0-t1, ω>ω 0 And dω / dt>0, during the t2-t3 period, ω0 And dω / dt0 |Gradually increases, so a larger inertia is needed to limit the increase of the rotor angular offset, and prevent excessive speed overshoot caused by excessively fast increase of angular velocity. However, during the acceleration process of the rotor, although a large inertia can improve the immunity, it will also slow down the response speed. Therefore, at this stage, the damping should be appropriately reduced to improve the system response speed and reduce the power overshoot. In the period of t1-t2, ω>ω 0 But dω / dt0 But Dω / dt>0, because |ω-ω 0 |Gradually decreases, which is defined as the deceleration phase of the rotor. B...

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Abstract

The invention discloses a virtual synchronous generator control method based on inertia and damping self-adaption, and belongs to the field of micro-grid operation control. According to the method, a self-adaptive relation between inertia and damping and an angular frequency change rate is designed, so that the system can freely configure inertia and damping according to system characteristics of different stages in a transient process of the system. When the system frequency is in an acceleration stage, the inertia needs to be increased to restrain the increase of the angular velocity of the virtual rotor. Although the large inertia can improve the anti-interference performance, the response speed can be slowed down, and therefore damping should be properly reduced at the same time in the stage to improve the response speed of the system. Meanwhile, according to the method, the threshold value of the angular frequency change rate is set, the inertia and damping change times are reduced, and it is guaranteed that the system is not affected during steady-state operation. According to the method, the overshoot and oscillation time of the system in the transient process are reduced, and the inertia of the system is effectively enhanced.

Description

technical field [0001] The invention belongs to the field of micro-grid operation control, in particular to a virtual synchronous generator control method based on inertia and damping self-adaptation. Background technique [0002] In recent years. As an effective carrier of renewable energy access to the grid, microgrid has received more and more attention. Traditional inverters based on virtual synchronous generator control can have external characteristics similar to synchronous generators. In this control technology, the inertia and damping of the system are important control parameters. The inertia can optimize the dynamic characteristics, and the damping can improve the angular performance. The steady-state characteristics of the frequency, through reasonable control of these two variables, can make the inverter have better control performance. However, many of the existing studies are limited to the simulation of synchronous generators and consider the superior flexi...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/42H02M7/48H02M7/493
CPCH02J3/38H02M7/42H02M7/48H02M7/493
Inventor 程天琪陈鸣慧李建勇
Owner CHINA UNIV OF MINING & TECH
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