Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A photovoltaic inverter DC voltage transient drop suppression method

A photovoltaic inverter, DC voltage technology, applied in photovoltaic power generation, conversion of AC power input to DC power output, electrical components, etc., can solve the problem that the response speed cannot be improved, the transient drop of DC voltage cannot be effectively suppressed, and the DC voltage oscillates and other problems, to achieve the effect of reducing fluctuations, suppressing transient drops, and speeding up the action

Inactive Publication Date: 2021-01-26
XIAN XJ POWER ELECTRONICS TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the control of the voltage loop is related to the tracking of the maximum power point. Changing the response speed of the voltage loop will cause the DC voltage to oscillate near the maximum power point, and the speed of the outer loop is limited by the inner loop of the current, so the response speed cannot be increased too much and cannot be effectively suppressed. Transient dips in DC voltage

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 photovoltaic inverter DC voltage transient drop suppression method
  • A photovoltaic inverter DC voltage transient drop suppression method
  • A photovoltaic inverter DC voltage transient drop suppression method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] see figure 1 , In the conventional three-level three-phase photovoltaic grid-connected inverter, the three-level circuit is suitable for high-voltage and high-power applications because the withstand voltage of the switching tube is only half of the DC voltage. The harmonic content of the output voltage of the three-level inverter is small, which can meet the requirements of the national standard for current harmonics at a lower switching frequency, and improve the overall efficiency of the device; and the three-level inverter can be selected with a higher The small filter reduces the volume of the device and improves the power density.

[0034] The inverter adopts LCL filter, L 1 is the pre-filter inductance, L 2 is the post-stage filter inductor, C AC For the AC filter capacitor. The LCL filter has a strong ability to suppress high-frequency har...

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

A photovoltaic inverter DC voltage transient drop suppression method, including: 1) in each control cycle, calculate the inverter DC voltage U dc Differential U dc_d ; 2) The differential value U of the DC voltage dc_d with DC voltage U dc summed, and then with the reference value of the DC voltage U dc * Make a difference to get the error of the DC voltage, and the error of the DC voltage gets the output U of the DC voltage outer loop through the DC voltage PI controller dc_out ; 3) the output U of the DC voltage outer loop dc_out Plus DC current full feedforward i ffd Get the reference value i of the current inner loop 1 * ; 4) Set the reference value i of the current inner loop 1 * Subtract current sampled value i 1 The current error value is obtained, and the current error value is obtained by the current inner loop PI controller to obtain the control amount of the control cycle; 5) the control amount is modulated to obtain the PWM pulse of each switching tube. The invention can greatly suppress the transient drop of the direct current voltage, and has fast response.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to a method for suppressing transient drop of DC voltage of a photovoltaic inverter. Background technique [0002] With the deterioration of the natural environment and the depletion of fossil energy, renewable energy power generation technology has received more and more attention. Among them, due to the inexhaustible characteristics of solar energy and the advantages of clean and pollution-free photovoltaic power generation, photovoltaic power generation technology has been widely used. Photovoltaic power generation is a technology that uses the photovoltaic effect of photovoltaic panels to directly convert solar energy into electrical energy. The photovoltaic panels emit direct current, which needs to be converted into alternating current through a grid-connected inverter. [0003] see figure 1 , the common three-phase grid-connected inverter adopts three-level topo...

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): H02J3/38H02M7/5395H02M1/12H02M1/14
CPCY02E10/56
Inventor 黎阳张海龙王林黄辉陈雪杨欣然马贝龙龚培娇李佳
Owner XIAN XJ POWER ELECTRONICS TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com