Unlock instant, AI-driven research and patent intelligence for your innovation.

SISO amplitude-phase impedance calculation method and system for single-phase grid-connected inverter in polar coordinate system

A polar coordinate system and impedance calculation technology, which is applied in the field of renewable energy power generation systems, can solve the problems of single-phase grid-connected inverter SISO small-signal impedance modeling difficulties, etc., to achieve rich and clear physical meaning, high model accuracy, and impedance The effect of concise expressions

Active Publication Date: 2021-10-08
HUNAN UNIV +1
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a single-phase grid-connected inverter SISO amplitude and phase impedance calculation method and system in the polar coordinate system to solve the problem of considering the current inner loop, voltage feedforward, and phase-locking. It is difficult to model the small-signal impedance of single-phase grid-connected inverter SISO form under the influence of ring, delay and SOGI module

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • SISO amplitude-phase impedance calculation method and system for single-phase grid-connected inverter in polar coordinate system
  • SISO amplitude-phase impedance calculation method and system for single-phase grid-connected inverter in polar coordinate system
  • SISO amplitude-phase impedance calculation method and system for single-phase grid-connected inverter in polar coordinate system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Such as figure 1 The main circuit topology of the single-phase grid-connected inverter system is shown, in which the switching tube Q 1 ~Q 4 Constitute a single-phase full-bridge inverter; U dc is a constant DC voltage; C dc is the DC side capacitance; L f Inverter side filter inductance and parasitic resistance R f ;C f For the filter capacitor and the series resistor R cf ; L g is the grid equivalent inductance and R g Equivalent resistance; u grid is the grid voltage; u pcc is the grid-connected point voltage; i pcc is the grid-connected point current.

[0028] figure 2 is the control block diagram of the single-phase grid-connected inverter system, collecting u pcc with i pcc Afterwards, the current virtual orthogonal quantity i is constructed through the SOGI module pccβ and voltage virtual quadrature u pccβ , after the clark transformation, the current I in the dq rotating coordinate system is obtained pccd , I pccq and voltage U pccd , U pcc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an SISO amplitude-phase impedance calculation method and system for asingle-phase grid-connected inverter ina polar coordinate system. An amplitude-phase admittance model of the single-phase grid-connected inverter in the rotating polar coordinate system is firstly built by considering the influence of a current inner loop, a phase-locked loop, time delay and power grid impedance of the single-phase grid-connected inverter, then, an amplitude-phase impedance model in an SISO form is deduced through matrix transformation, and the accuracy of the established model is verified through simulation and experiments.

Description

technical field [0001] The invention relates to the field of renewable energy power generation systems, in particular to a modeling method for SISO amplitude-phase impedance of a single-phase grid-connected inverter in a polar coordinate system. Background technique [0002] As the penetration rate of renewable energy power generation continues to increase, the trend of power electronics in the power system is becoming more and more obvious. The power electronic converter is an interface for renewable energy generation to be integrated into the grid, and its operating characteristics will affect the ability of renewable energy to be integrated into the grid. Therefore, establishing an accurate small-signal model of the power electronic converter is particularly important for analyzing the stability of the power electronic power system. [0003] The impedance modeling of existing power electronic converters is mainly aimed at three-phase systems. Due to its special asymmetry...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/493H02J3/38
CPCH02M7/48H02M7/493H02J3/38H02J2203/20H02J2203/10H02J2300/20
Inventor 徐元璨陈燕东伍文华罗安谢志为王自力曹世骧郭小龙王衡
Owner HUNAN UNIV