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Multi-machine parallel stability control and inertia matching method of virtual synchronous machines

A virtual synchronous machine and inertia matching technology, which is applied in the direction of AC network circuits, electrical components, single-network parallel feeding arrangements, etc., can solve the problems of inaccurate analysis results and failure to consider the steady-state operating point of the system, etc.

Inactive Publication Date: 2021-07-16
STATE GRID CORP OF CHINA +2
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Problems solved by technology

The prior art analyzes VSG small-signal stability in both grid-connected and islanded modes, and points out that changes in inertial time constant, damping coefficient, and reactive power droop coefficient have a greater impact on system stability, but the above-mentioned technologies cannot be used in the modeling process. The change of the steady-state operating point of the system is not considered. Although the analysis process is simplified, the analysis results are not accurate enough, and most of the modeling and analysis are carried out for the VSG single machine. For the accurate small signal modeling and analysis of the VSG multi-machine parallel system, it is urgent to solve The problem

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  • Multi-machine parallel stability control and inertia matching method of virtual synchronous machines
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  • Multi-machine parallel stability control and inertia matching method of virtual synchronous machines

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[0095] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0096] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, a...

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Abstract

The invention discloses a multi-machine parallel stability control and inertia matching method of virtual synchronous machines. In order to solve the problem of large-scale micro power supply access stability control in a new energy power system, a virtual synchronous machine multi-machine parallel connection stability control strategy is studied, and a VSG active-frequency and reactive-voltage controller is built, a simplified virtual inertia simulator is provided, so that a control system does not need to introduce a PLL link, and the influence of phase locking precision on VSG control characteristics is reduced; and establishing an accurate small signal model of a VSG multi-machine parallel operation system, and analyzing the change condition of the characteristic root of the system when parameters such as virtual rotational inertia, a droop coefficient, a line parameter and virtual impedance change, and the influence rule of the change condition on the stability of the small signal. The VSG multi-machine parallel system inertia matching method is provided, the virtual inertia of each VSG is configured according to the inertia matching principle, and it can be guaranteed that each VSG can achieve load distribution according to the capacity proportion in the steady-state and transient-state processes.

Description

technical field [0001] The invention relates to a virtual synchronous machine multi-machine parallel stability control and an inertia matching method thereof, and belongs to the technical field of distributed power sources actively participating in power grid frequency and voltage adjustment. Background technique [0002] Unlike traditional energy sources that are mostly connected to the grid through synchronous generators, more and more distributed power sources are connected to the grid through power electronic grid-connected inverters. Compared with traditional synchronous generators, distributed power grid-connected inverters The inverter has the advantage of quick response, but because it is a stationary device, it cannot provide sufficient inertia and damping support for the grid. With the increasing penetration of distributed power, it will seriously affect the dynamic response and stability of the power system. sex. [0003] Therefore, scholars at home and abroad ha...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/42H02J3/48H02J3/50H02J3/46
CPCH02J3/42H02J3/48H02J3/50H02J3/466H02J2203/20
Inventor 李泽卿李征陈岩李瑞史立烨
Owner STATE GRID CORP OF CHINA
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