Virtual synchronous power generator-based fault ride-through control method and system

A technology of virtual synchronization and fault ride-through, which is applied to electrical components, circuit devices, AC network circuits, etc., can solve the problem that fault ride-through of the power grid does not fully consider the characteristics of virtual synchronous generators, and achieve the effect of optimizing control strategies and ensuring stability

Active Publication Date: 2018-05-04
XJ ELECTRIC +3
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Problems solved by technology

[0004] The purpose of the present invention is to provide a virtual synchronous generator based fault ride-through control method and system, which is used to solve the problem in the prior art that the characteristics of the virtual synchronous generator are not fully considered when dealing with the grid fault ride-through problem

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  • Virtual synchronous power generator-based fault ride-through control method and system
  • Virtual synchronous power generator-based fault ride-through control method and system
  • Virtual synchronous power generator-based fault ride-through control method and system

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Embodiment Construction

[0024] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0025] A fault ride-through control system based on virtual synchronous generators, such as figure 1 As shown, it includes a controller, a virtual synchronous generator DC / DC converter and a virtual synchronous generator DC / AC converter; wherein, the DC / DC converter and the DC / AC converter include power modules respectively, Each power module is composed of an insulated gate bipolar transistor IGBT. The controller controls and connects the DC / DC converter of the virtual synchronous generator and the DC / AC converter of the virtual synchronous generator. When the controller judges the failure of the power grid, it controls the DC / DC conversion of the virtual synchronous generator when the power grid fails. Switch from constant voltage control mode to add current feedback value in constant voltage control mode to control DC / DC converter; and control...

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Abstract

The invention provides a virtual synchronous power generator-based fault ride-through control method and system. During a power grid fault, a DC / DC converter of a virtual synchronous machine is switched to a constant-voltage and feedforward control mode from a constant-voltage control mode, a first current instruction value is obtained by subtracting a voltage instruction value from a voltage feedback value and by PI regulation, a first voltage value is obtained by subtracting the first current instruction value from a current feedback value and by PI regulation, the DC / DC converter is controlled, a DC / AC converter of the virtual synchronous machine is switched to a current-constant control mode from a VSG control mode, a reactive current is obtained by reactive voltage regulation control,an active current is calculated according to the reactive current, and the DC / AC converter of the virtual synchronous machine is controlled according to the reactive current and the active current which are obtained by calculation. By mode conversion of a virtual synchronous power generation system and control strategy optimization, fault ride-through of a station-type virtual synchronous power generator is achieved, and the stability of a power system is ensured.

Description

technical field [0001] The invention belongs to the technical field of virtual synchronous generators, in particular to a fault ride-through control method and system based on virtual synchronous generators. Background technique [0002] With the contradiction between the development of the national economy and the depletion of fossil energy becoming more and more obvious, the distributed power generation system featuring renewable energy quickly occupies a key position in future power research. The grid-connected capacity of renewable energy is also increasing, and its impact on the large power grid is getting deeper and deeper. The micro-grid provides a way for the application of distributed wind power generation systems. The grid-connected inverter is used as a link between the micro-grid and the large grid. The ties have an important impact on the operation of the microgrid. The grid-connected inverter is mainly composed of power electronic devices, which brings a serie...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J3/50H02J3/48
CPCH02J3/24H02J3/381H02J3/48H02J3/50
Inventor 刘海舰刘刚王平刘汉民孙健胡四全许恩泽徐明明朱斯史学伟
Owner XJ ELECTRIC
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