A grid-connected control method and system based on virtual synchronous motor self-adjusting inertia

A technology of virtual synchronous motor and control method, which is applied in the direction of wind power generation, single-network parallel feeding arrangement, etc., can solve problems such as power grid frequency fluctuations and affect power grid quality, and achieve overcoming the influence of frequency fluctuations, improving power grid quality, and good dynamics Effects of Response Properties

Active Publication Date: 2022-07-08
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

Based on this reality, a new concept of virtual synchronous motor is proposed for grid-connection of renewable energy. Traditional renewable energy grid-connection through inverters has no inertia. When large-scale renewable energy grid-connection will reduce the total Inertia, once the load switching will cause great fluctuations in the frequency of the grid, and then affect the quality of the grid

Method used

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  • A grid-connected control method and system based on virtual synchronous motor self-adjusting inertia
  • A grid-connected control method and system based on virtual synchronous motor self-adjusting inertia
  • A grid-connected control method and system based on virtual synchronous motor self-adjusting inertia

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Embodiment 1

[0071] Example one, as figure 1 As shown in the figure, a grid-connected control method based on the self-adjusting inertia of a virtual synchronous motor includes the following steps:

[0072] S1: establish a virtual synchronous motor model and a grid-connected load switching model corresponding to the virtual synchronous motor model;

[0073] S2: Perform load switching simulation on the grid-connected load switching model according to preset switching parameters to obtain a simulation result, and in the actual grid connection process, obtain the virtual synchronous motor model according to the simulation result. Adaptive target inertia;

[0074] S3: Obtain a control strategy corresponding to the grid-connected inverter according to the adaptive target inertia, and perform grid-connected control on the grid-connected inverter according to the control strategy.

[0075] In this embodiment, a grid-connected load switching model and a virtual synchronous motor model that can r...

Embodiment 2

[0118] Embodiment two, as figure 2 As shown, a grid-connected control system based on virtual synchronous motor self-adjusting inertia is applied to the grid-connected control method based on virtual synchronous motor self-adjusting inertia in the present invention, including a grid-connected inverter, a load switching controller and a virtual synchronous motor controller, the grid-connected inverter is connected with the virtual synchronous motor controller, and the virtual synchronous motor controller is connected with the load switching controller;

[0119] the virtual synchronous motor controller for establishing a virtual synchronous motor model;

[0120] The load switching controller is used to establish a grid-connected load switching model corresponding to the virtual synchronous motor model, and is also used to perform load switching simulation on the grid-connected load switching model according to preset switching parameters simulation to obtain a simulation resul...

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Abstract

The invention relates to a grid-connected control method and system based on the self-adjusting inertia of a virtual synchronous motor. The method includes establishing a virtual synchronous motor model and a corresponding grid-connected load switching model; and switching the grid-connected load according to preset switching parameters. The load switching simulation is performed on the switching model, and the simulation results are obtained. In the actual grid connection process, the adaptive target inertia of the virtual synchronous motor model is obtained according to the simulation results; the grid connection is obtained according to the adaptive target inertia. The control strategy corresponding to the inverter, and the grid-connected inverter is controlled according to the control strategy. The grid-connected control method of the present invention realizes self-adjusting inertia based on the simulation of virtual synchronous motor and load switching. When the load of the micro-grid changes no matter how, the power generation unit of the renewable energy can adjust the optimal inertia according to the adaptive adjustment. Stable operation can not only overcome the influence of frequency fluctuation, but also ensure better dynamic response characteristics.

Description

technical field [0001] The invention relates to the technical field of power electronics and smart grids, and in particular, to a grid-connected control method and system based on the self-adjusting inertia of a virtual synchronous motor. Background technique [0002] The traditional thermal power plants are mainly based on synchronous motors. When the load fluctuation of the power grid is large, the synchronous motor has inertia, so the frequency fluctuation of the power grid can be suppressed. Based on this reality, a new concept of virtual synchronous motor is proposed for grid connection of renewable energy. Traditional renewable energy is connected to the grid through inverters without inertia. When large-scale renewable energy is connected to the grid, it will reduce the total grid capacity Inertia, once the load is switched on and off, it will cause great fluctuations in the frequency of the power grid, thereby affecting the quality of the power grid. [0003] Theref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40
CPCH02J3/40H02J2203/20Y02E10/76
Inventor 史博凯胡为兵江卫华李泰胡俊冯先成熊轩
Owner WUHAN INSTITUTE OF TECHNOLOGY
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