Impedance modeling and stability analysis method for voltage-control virtual synchronous generator

A voltage-controlled, virtual synchronization technology, applied in electrical components, circuit devices, AC network circuits, etc., to achieve the effect of being conducive to popularization and application, high model accuracy, and clear physical meaning

Active Publication Date: 2018-07-13
HUNAN UNIV
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for impedance modeling and stability analysis of a voltage-controlled virtual synchronous generator to

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  • Impedance modeling and stability analysis method for voltage-control virtual synchronous generator
  • Impedance modeling and stability analysis method for voltage-control virtual synchronous generator
  • Impedance modeling and stability analysis method for voltage-control virtual synchronous generator

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Embodiment Construction

[0027] figure 1 It is the main circuit topology of a voltage-controlled virtual synchronous generator. Among them: the switching tubes Q1~Q6 constitute the three-phase inverter full bridge of the voltage-controlled virtual synchronous generator; V dc is the DC side voltage of the voltage-controlled virtual synchronous generator, which can be considered as a stable value; e a 、e b and e c is the internal potential of the voltage-controlled virtual synchronous generator; i a i b and i c is the output current of the voltage-controlled virtual synchronous generator; v a , v b and v c is the output voltage of the voltage-controlled virtual synchronous generator; L f 、C f and R f are the filter inductance, filter capacitor and damping resistor of the voltage-controlled virtual synchronous generator; L g and R g is the equivalent line inductance and resistance of the grid; v ga , v gb and vgc is the grid voltage; i ga i gb and i gc is the incoming current.

[0028]...

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Abstract

The invention discloses an impedance modeling and stability analysis method for a voltage-control virtual synchronous generator. The influence of a virtual synchronous generator active controller is considered in order to provide a voltage-control virtual synchronous generator broadband small-signal modeling method based on a sequence impedance model, overcoming the difficulties in voltage-controlvirtual synchronous generator small-signal impedance modeling. On the basis of an established broadband small-signal sequence impedance model, a grid impedance model and Nyquist stability criterion,the influences of grid impedance and the number of voltage-control virtual synchronous generator grid-connected units upon system stability are analyzed. The results show that in any case of high gridimpedance and the large number of the virtual synchronous generator grid-connected units, a virtual synchronous generator grid-connected system can stably run. The models and method are provided forthe small disturbance stability analysis in the scenes, such as voltage-control virtual synchronous generators connected to a grid, and new energy stations; the popularization and application of the voltage-control virtual synchronous generators are benefited.

Description

technical field [0001] The invention relates to the field of renewable energy power generation systems, in particular to a small-signal sequence impedance modeling and stability analysis method for a voltage-controlled virtual synchronous generator. Background technique [0002] With the shortage of fossil energy and the aggravation of environmental pollution, new energy power generation has developed rapidly. A large amount of new energy power generation is distributed in remote areas such as the Gobi, mountains, and islands, making the connection between it and the main grid weak, and the power grid presents the characteristics of high inductance and weak power grid. Traditional new energy grid-connected inverters often adopt a current closed-loop control strategy based on the voltage phase of the grid-connected point, and its external characteristics are current sources. When traditional grid-connected inverters are connected to weak grids, they are prone to interactive ...

Claims

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Application Information

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IPC IPC(8): H02J3/40H02J3/38
CPCH02J3/382H02J3/40H02J2203/20
Inventor 罗安伍文华陈燕东周乐明周小平杨苓谢志为张兵王伊骆坚
Owner HUNAN UNIV
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