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Control method, device and equipment for virtual synchronous inverters

A virtual synchronization and inverter control technology, applied in the field of power grid, can solve the problems of fast fault response speed of virtual synchronous inverters, inability to reach transient impact current, large transient impact current, etc.

Inactive Publication Date: 2019-03-29
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

[0004] At present, the control strategy for the transient inrush current of the virtual synchronous inverter when the power grid is faulty is to switch the virtual synchronous control of the virtual synchronous inverter to PR control in the faulty device to achieve the purpose of controlling the transient inrush current, but Due to the large transient impact current generated by the virtual synchronous inverter, and the fault response speed of the virtual synchronous inverter is fast, and the PR control is a second-order control model, its response speed is slow, and it cannot reach The purpose of quickly suppressing the transient surge current generated by the virtual synchronous inverter

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  • Control method, device and equipment for virtual synchronous inverters
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  • Control method, device and equipment for virtual synchronous inverters

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Embodiment Construction

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 belong to the protection scope of the present invention.

[0063] The embodiment of the invention discloses a control method, device and equipment for a virtual synchronous inverter, which achieves the purpose of quickly suppressing the transient surge current generated by the virtual synchronous inverter.

[0064] In order to better describe the technical solutions provided by the embodiments of the present invention, the structure of the virtual synchronous inverter and the entire power grid will be described first b...

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Abstract

The invention discloses a control method for virtual synchronous inverters. After a power grid is judged to be in an asymmetric fault state by comparing the output current of a virtual synchronous inverter with a protection value, the virtual synchronous inverter is switched from the current virtual synchronous inversion control mode to a hysteresis comparison control mode, wherein the hysteresiscomparison control mode refers to controlling the transient impulse current of the virtual synchronous inverter by using the output of a hysteresis comparator. According to the scheme, because the hysteresis comparison control mode has the advantage of fast response, the fault response speed of the virtual synchronous inverter can be synchronized, and the transient impulse current produced by thevirtual synchronous inverter can be controlled quickly within the normal range of the reference current. The purpose of fast suppression of the transient impulse current produced by a virtual synchronous inverter is achieved. In addition, the invention discloses a control device and equipment for virtual synchronous inverters, which have the same effect.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a control method, device and equipment for a virtual synchronous inverter. Background technique [0002] Grid-connected inverters are inverters that connect distributed power sources such as wind energy and solar energy to the grid. Grid-connected inverters are static devices with no mechanical inertia and extremely fast response speeds, and are susceptible to load fluctuations or short-circuit faults. The impact of grid fluctuations. To solve this problem, the grid-connected inverter simulates the inertia of the synchronous generator through the virtual synchronous control strategy, which greatly improves the anti-disturbance ability of the grid-connected inverter. Therefore, compared with other control strategies, the virtual synchronous control strategy is distributed There are absolute advantages in grid connection of conventional energy sources and maintaining stable op...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/381H02J2203/20
Inventor 喻磊袁智勇雷金勇陈柔伊黄安迪马溪原胡洋
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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