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

A Stability Control Method for Photovoltaic Grid-connected System Based on Description Function

A technology for system stability and stable control, applied in photovoltaic power generation, AC network circuit, single-network parallel feeding arrangement, etc. The effect of avoiding oscillation and ensuring system stability

Active Publication Date: 2022-03-15
ZHEJIANG UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The maximum power tracking control based on the disturbance and observation method is a control method commonly used in photovoltaic systems, but the control method itself has nonlinear and discontinuous characteristics, which makes the traditional small-signal stability analysis method difficult to apply

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
  • A Stability Control Method for Photovoltaic Grid-connected System Based on Description Function
  • A Stability Control Method for Photovoltaic Grid-connected System Based on Description Function
  • A Stability Control Method for Photovoltaic Grid-connected System Based on Description Function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0067] The photovoltaic grid-connected system topology and its controller described in the embodiment of the present invention are as follows: figure 1 As shown, the electric energy generated by the photovoltaic panel PV is stepped down by the BUCK circuit, filtered by the LCL filter, and then sent to the DC power grid. Among them, the photovoltaic panel output current is i pv , the output DC voltage is v pv , the DC stabilizing capacitor is C pv , the inductance and capacitance of the LCL filter are L 1 , L 2 and C, the currents flowing through them are i 1 i 2 and i C , the voltage across the filter capacitor is v C . Among them, the DC grid is represented by the equivalent impedance in series with an ideal voltage source, and the ideal voltage source is V s , the equivalent resistance of the DC grid is R g , the equivalent inductance of the DC grid is L g . The stability controller of photovoltaic grid-connected system mainly includes power loop (P&O), stability...

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 present invention relates to a method for stabilizing control of a photovoltaic grid-connected system based on a description function. The present invention sets a stability control loop in the system, establishes a transfer function of the linear part of the photovoltaic grid-connected system model, and establishes a description function for the nonlinear link of the system based on the description function method. . The description function can well analyze the system instability problem caused by the nonlinear discontinuous link, and at the same time can quantitatively calculate the amplitude and frequency of the system oscillation in the critical stable state. Based on the analysis results of the description function method, a stability control method is proposed. The control parameters can be adjusted according to the power grid strength, which can effectively enhance the system stability and avoid oscillation.

Description

technical field [0001] The invention relates to a stability control method for a photovoltaic grid-connected system based on a description function, and belongs to the field of stability analysis of new energy power generation systems in power systems. Background technique [0002] The proportion of renewable energy power generation continues to increase, and the scale of photovoltaic power generation is growing rapidly. Distributed photovoltaic power generation is an important form of solar energy utilization. Generally, solar energy is collected through photovoltaic panels, and then sent to the DC bus through a converter, and together with local loads, etc., constitute a DC microgrid or an AC-DC hybrid microgrid. The maximum power tracking control based on the perturbation and observation method is a control method commonly used in photovoltaic systems, but the control method itself has nonlinear and discontinuous characteristics, which makes the traditional small-signal s...

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 Patents(China)
IPC IPC(8): H02J3/00H02J3/38H02J3/24
CPCH02J3/002H02J3/381H02J3/241H02J2203/20H02J2300/24Y02E10/56Y02B10/10
Inventor 于淼刘佳宁陆玲霞赵竞涵韦巍
Owner ZHEJIANG UNIV