Robust dicyclic photovoltaic grid-connected control method based on power feedforward

A control method and robust technology, applied in the field of smart grid and solar power generation, which can solve the problems of dead time delay, inductance parameter mismatch, lag, etc.

Active Publication Date: 2012-05-09
HUNAN UNIV
View PDF4 Cites 59 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a robust double-loop photovoltaic grid-connected control method based on power feedforward to overcome the shortcomings of the existing double-closed-loop control method and solve the problems existing in deadbeat control. One-beat lag control, PWM action delay, dead time delay, and inductance parameter mismatch, etc.

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
  • Robust dicyclic photovoltaic grid-connected control method based on power feedforward
  • Robust dicyclic photovoltaic grid-connected control method based on power feedforward
  • Robust dicyclic photovoltaic grid-connected control method based on power feedforward

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] figure 1Shown is a schematic diagram of a single-phase grid-connected photovoltaic power generation system without a transformer structure, which mainly includes a photovoltaic array, Boost circuit, full-bridge inverter circuit, LC filter, drive protection circuit, LCD touch screen and DSP control system. C pv It is a boost energy storage capacitor for stabilizing the output voltage of the photovoltaic array; C dc It is the DC capacitor on the inverter side, which filters out the 100Hz ripple generated by the inverter and buffers the energy exchange between photovoltaic power and grid power. ; L s is the inverter output inductance, and C is the inverter output capacitance, which constitutes an LC filter to filter out high-frequency harmonics of the inverter; U s is the grid voltage. Due to the low photovoltaic output...

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 a robust dicyclic photovoltaic grid-connected control method based on power feedforward, which mainly comprises three parts: proportion integration (PI) control of exocyclic voltage, dead-beat control of endocyclic robust predictive current and power feedforward control, wherein the exocyclic PI control of the voltage is used for stabilizing the capacitive voltage of a direct-current side; the dead-beat control of the endocyclic robust predictive current is used for carrying out linear prediction on the voltage of a power grid at a next control period and carrying out non-linear prediction on grid-connected current by advanced control so as to obtain the command value of the grid-connected current at the next period; and then, PWM (pulse-width modulation) and grid-connected control are realized by the dead-beat control. According to the robust dicyclic photovoltaic grid-connected control method based on the power feedforward, a photovoltaic grid-connected inverter has higher robustness, wider stability margin and quicker dynamic response, and the requirement of grid-connected running of an inverter is better met.

Description

technical field [0001] The invention relates to the fields of smart grid and solar power generation, in particular to a robust double-loop photovoltaic grid-connected control method based on power feedforward. Background technique [0002] With the deterioration of the ecological environment and the depletion of non-renewable energy sources, energy conservation and emission reduction and new energy technologies have become current research hotspots. As an abundant non-polluting and clean energy, solar energy has become an important way to solve energy problems. As renewable energy is connected to the low-voltage distribution network through the construction of a distributed power generation structure, the grid-connected control strategy as a key technology for solar photovoltaic grid-connected power generation , and its research has received increasing attention. How to improve the overall conversion efficiency and power factor of the inverter, and reduce the distortion rat...

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): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 罗安陈燕东张庆海谢三军吕志鹏金国彬徐欣慰
Owner HUNAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap