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Presynchronization control method based on virtual synchronous generator

A virtual synchronization and control method technology, applied in the field of control, can solve the problems of weak anti-overvoltage and overcurrent ability, large inrush current, damage to inverter switching devices and magnetic components, etc., to achieve fast and accurate pre-synchronization, and small inrush current , Smooth and friendly grid connection effect

Inactive Publication Date: 2015-06-10
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0005] However, figure 2 Only the control block diagram of the steady-state operation after the virtual synchronous generator is integrated into the grid is given, and the switching process of the virtual synchronous generator from off-grid to grid-connected is not explained
It should be pointed out that the use of figure 2 The control block diagram shown only makes the virtual synchronous generator simulate the external characteristics of the synchronous generator in control, and its main circuit is still composed of fragile power electronic devices. Compared with the actual synchronous generator, its anti-overvoltage and overcurrent Weak ability
If the virtual synchronous generator is connected to the power grid using the traditional method of dragging the synchronous generator into synchronization, the surge current will be too large at the moment of grid connection, which will cause damage to the switching devices and magnetic components of the inverter

Method used

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  • Presynchronization control method based on virtual synchronous generator
  • Presynchronization control method based on virtual synchronous generator
  • Presynchronization control method based on virtual synchronous generator

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Embodiment Construction

[0036] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. These embodiments of the present invention may be referred to herein, individually or collectively, by the term "invention", which is for convenience only and is not intended to automatically limit the application if ...

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Abstract

The invention relates to a presynchronization control method based on a virtual synchronous generator. The method comprises the steps that a three-phase network voltage amplitude value Vg, a three-phase network voltage frequency omega g and a three-phase network voltage phase angle theta g are obtained; a voltage amplitude value Vo output by an inverter, voltage frequency omega o output by the inverter and a voltage phase angle theta o output by the inverter are obtained; a frequency feedback integration element is cut in; a voltage feedback integration element is cut in; a proportional integral adjuster III is cut in; and a grid connection switch is closed, so that the synchronous generator is connected into a power grid. According to the technical scheme, the fact that before virtual synchronous generator grid connection, the frequency, the amplitude, the phase and the grid voltage output by the virtual synchronous generator are the same can be guaranteed, accordingly small grid connection instant impact current is achieve, and inverter smooth friendly grid connection is guaranteed.

Description

technical field [0001] The invention relates to a control method, in particular to a pre-synchronization control method based on a virtual synchronous generator. Background technique [0002] With the depletion of fossil energy and the improvement of environmental protection awareness, distributed power generation systems based on renewable energy have developed rapidly. However, as the proportion of distributed generation in the power system gradually increases, the impact of distributed generation on the power system cannot be ignored. In order to improve the acceptance capacity of the grid for distributed energy, a virtual synchronous generator technology can be used, that is, through control, the grid-connected inverter can simulate the inertia, primary frequency regulation, primary voltage regulation and excitation regulation characteristics of the synchronous generator, so that the distributed The power supply, like the synchronous generator, can actively participate ...

Claims

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Application Information

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IPC IPC(8): H02J3/40
Inventor 吕志鹏苏剑刘海涛吴鸣季宇李洋于辉梁惠施
Owner STATE GRID CORP OF CHINA
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