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Impedance modeling and stability analysis method of current controlled virtual synchronous generator

A virtual synchronization and current control technology, applied in electrical components, circuit devices, AC network circuits, etc., to achieve the effects of high model accuracy, clear physical meaning, and simple expressions

Active Publication Date: 2018-08-17
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • 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 current-controlled virtual synchronous generator to solve the problem of considering active power controller, reactive power controller and current inner loop control. Problems in Modeling Small-Signal Impedance of a Current-Controlled Virtual Synchronous Generator During Influence

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  • Impedance modeling and stability analysis method of current controlled virtual synchronous generator
  • Impedance modeling and stability analysis method of current controlled virtual synchronous generator
  • Impedance modeling and stability analysis method of current controlled virtual synchronous generator

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Embodiment Construction

[0030] figure 1 It is the main circuit topology of the current-controlled virtual synchronous generator. Among them: the switching tubes Q1~Q6 constitute the three-phase inverter full bridge of the current-controlled virtual synchronous generator; V dc is the DC side voltage of the current-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 current-controlled virtual synchronous generator; i a i b and i c is the output current of the current-controlled virtual synchronous generator; v a , v b and v c is the output terminal voltage of the current-controlled virtual synchronous generator; L f 、C f and R f are the filter inductance, filter capacitor and damping resistance of the current-controlled virtual synchronous generator; L g and R g is the equivalent line inductance and resistance of the grid; v ga , v gb and v gc is the grid voltage; i ga i gb and i gc is the incoming cur...

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Abstract

The invention discloses an impedance modeling and stability analysis method of a current controlled virtual synchronous generator. In consideration of the influence of the active controller, the reactive controller, the current inner loop control and the phase locked loop of the current controlled virtual synchronous generator, a wideband small signal modeling method for current controlled virtualsynchronous generator based on sequence impedance model is provide to solve the problem of small signal impedance modeling of current controlled virtual synchronous generator. Based on a built wideband small signal impedance model, a grid impedance model and a Nyquist stability criterion, the influence of grid impedance, current controlled virtual synchronous generator grid-connected number and phase-locked loop control bandwidth on system stability is analyzed. The invention provides a model and method for analyzing the small disturbance stability in scenes of the current controlled virtualsynchronous generator connected to a micro grid and a new energy field station.

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 current-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. Traditional grid-connected inverters are prone to interactive stability problems such as harmonic oscillation when connected to weak grids. When the penetra...

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刘家源彭上谢露
Owner HUNAN UNIV
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