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Two-parameter adaptive control method for virtual synchronous generator

A technology of adaptive control and virtual synchronization, applied in the direction of reducing/preventing power oscillation, which can solve the problems of no colleague considering common influence, not introducing the range of natural oscillation angular frequency of synchronous generators, and inconvenient adjustment of control parameters.

Active Publication Date: 2019-11-19
SHANGHAI DIANJI UNIV
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Problems solved by technology

This patent can improve the response speed of the virtual synchronous generator to the power change of the microgrid, reduce the frequency overshoot, amplitude deviation and change rate of the microgrid, but no colleagues consider the joint influence of the virtual inertia and damping coefficient dual parameters, and no The range of natural oscillation angular frequency of traditional synchronous generators is not convenient for the tuning of control parameters

Method used

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  • Two-parameter adaptive control method for virtual synchronous generator
  • Two-parameter adaptive control method for virtual synchronous generator
  • Two-parameter adaptive control method for virtual synchronous generator

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Embodiment Construction

[0068] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0069] The input and output power response characteristics of the virtual synchronous generator are typical second-order transfer functions:

[0070]

[0071] When the damping coefficient D t When it is small, it is easy to cause low-frequency oscillation, which will affect the safety and stability of the power grid. The natural oscillation angular frequency range of traditional synchronous generators is 0.628-15.7rad / s, and the damping ratio of the optimal second-order system is defined at 0.707. The system can be stabilized onl...

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Abstract

The invention relates to a two-parameter adaptive control method for a virtual synchronous generator. The method is used for enhancing the stability of microgrids to access to electric power systems.The method includes performing automatic adjusting on control parameters according to the changes of power angle characteristics and natural oscillation angular frequencies and the frequency power angle relation of a virtual synchronous generator, wherein the control parameters include virtual inertia and damping coefficients; and when the natural oscillation angular frequencies deviate power gridfrequencies, increasing the virtual inertia and damping coefficients, and reducing the virtual inertia and damping coefficients when the natural oscillation angular frequencies close to the power grid frequencies. Compared with the prior art, the method has advantages.

Description

technical field [0001] The invention relates to the fields of new energy power systems and microgrids, in particular to a dual-parameter self-adaptive control method for a virtual synchronous generator. Background technique [0002] In recent years, with the increasing environmental pollution and the depletion of fossil energy, renewable energy represented by wind power and photovoltaics has attracted widespread attention. Distributed wind turbines and distributed photovoltaics are one of the important forms of renewable energy development and utilization, and microgrids are an important carrier for their access to the power system. Different from conventional energy units, the interface is connected to the microgrid, so the control technology of the grid-connected inverter plays an important role in the grid-connection of renewable energy. Traditional grid-connected technologies are divided into voltage source control and current source control. Compared with current sour...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 白天宇刘军范亚楠余同许志明
Owner SHANGHAI DIANJI UNIV
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