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

Inverter grid connected harmonic suppression system based on error transfer function algorithm

A technology of error transfer and harmonic suppression, applied in AC network to reduce harmonics/ripple, harmonic reduction device, AC network circuit, etc., can solve problems such as high price, large system noise, poor adaptive ability, etc. Achieve the effects of fast response, strong robustness, and low production and maintenance costs

Inactive Publication Date: 2018-10-16
深圳市新能安华技术有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional inverters use large-scale LC (LCL) filtering, or software filtering and feed-forward control technology to minimize the harmonic pollution to the grid, but the effect is not very good, basically there will be large system noise, and The whole system is large in size, complex in algorithm, high in price, and poor in adaptability

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
  • Inverter grid connected harmonic suppression system based on error transfer function algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0011] Such as figure 1 , this embodiment provides an inverter grid-connected harmonic suppression system based on the error transfer function algorithm, including: a grid voltage sensor 2 for detecting the voltage of the grid 1, a current generator 5 for generating a reference current, and The grid current sensor 3 for measuring the actual current of the grid 1, the PR harmonic resonance controller 7 for preventing excessive phase errors, the fft measurement error transfer function 6 for the adaptive system, and the discrete fft measurement error transfer function 6 Invariant impulse response method, unipolar SPWM9, IGBT power switch tube 10, LC filter 11, and MCU for controlling the operation of the entire system, the grid voltage sensor 2 is connected to the grid 1, and the grid current sensor 3 is connected to the grid The grid 1 is conn...

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 inverter grid connected harmonic suppression system based on an error transfer function algorithm. The system comprises a power grid voltage sensor, a current generator, a power grid current sensor, a PR harmonic resonance controller, a monopole SPWM, an IGBT power switching tube, an LC filter and an MCU, the power grid voltage sensor is connected with the current generator, the current generator is connected with the PR harmonic resonance controller, the power grid current sensor is connected with the PR harmonic resonance controller, the PR harmonic resonance controller is connected with the monopole SPWM, the monopole SPWM is connected with the IGBT power switching tube, the IGBT power switching tube is connected with the LC filter, and the LC filter is connected with a power grid. All interference is regarded as system total noise, the PR harmonic suppression algorithm is connected in parallel on the basis of the PR base wave resonance algorithm, according to an fft determined error transmission function, the gain, the center frequency point and the bandwidth of the PR harmonic suppression algorithm are determined, a pulse response invariance method is adopted for dispersing the fft determined error transmission function, the whole system reaches the 20 db or more harmonic attenuation rate.

Description

technical field [0001] The invention relates to the field of grid-connected harmonic suppression, in particular to an inverter grid-connected harmonic suppression system based on an error transfer function algorithm. Background technique [0002] The inverter is a power device that converts direct current into alternating current. It is widely used in new energy fields such as photovoltaics. Its essence is to use the area equivalent principle to convert energy pulses into analog electric energy. Due to the unavoidable influence of pulse high-order harmonics, signal intermodulation, non-ideal characteristics of switching and filter devices, environmental interference and other factors during the conversion process, in addition to outputting normal power frequency energy at the output end of the inverter, there are also Output a large number of harmonic components. Traditional inverters use large-scale LC (LCL) filtering, or software filtering and feed-forward control technol...

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): H02J3/01
CPCH02J3/01H02J2203/20Y02E40/40
Inventor 张忠谭正军
Owner 深圳市新能安华技术有限公司
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