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

Positive and negative sequence component separation method of low-voltage ride-through control of photovoltaic grid-connected inverter

A low-voltage ride-through and separation method technology, which is applied in the field of separation of positive and negative sequence components of low-voltage ride-through control of photovoltaic grid-connected inverters, can solve the problems of complex implementation process and large amount of calculation of software algorithms, and achieve strong practicability, Realize the effect of low voltage ride through control

Inactive Publication Date: 2013-08-28
XIAN UNIV OF TECH
View PDF3 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the implementation process of the above method is relatively complicated, and the calculation amount of the software algorithm is large.

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
  • Positive and negative sequence component separation method of low-voltage ride-through control of photovoltaic grid-connected inverter
  • Positive and negative sequence component separation method of low-voltage ride-through control of photovoltaic grid-connected inverter
  • Positive and negative sequence component separation method of low-voltage ride-through control of photovoltaic grid-connected inverter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as figure 1 As shown, the input terminals of the voltage positive-sequence and negative-sequence component extraction unit are respectively connected to the output terminals of the three-phase voltage detection unit and the output terminal of the genlock unit; the input terminals of the current positive-sequence and negative-sequence component extraction unit are respectively connected to the three-phase current The output terminal of the detection unit is connected to the output terminal of the genlock unit; the input terminal of the genlock unit is respectively connected to the output terminal of the three-phase voltage detection unit and the two output terminals of the genlock unit; the input terminal of the current control unit They are respectively connected to the output terminal of the voltage positive sequence negative seq...

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 positive and negative sequence component separation method of low-voltage ride-through control of a photovoltaic grid-connected inverter. The positive and negative sequence component separation method of the low-voltage ride-through control of the photovoltaic grid-connected inverter is characterized by comprising the following steps of obtaining three-phase voltage instantaneous values and three-phase current instantaneous values through detection of voltage and current of a power gird, obtaining output signals which are a voltage synchronous phase angle sine value and a voltage synchronous phase angle cosine value of the power grid, and output signals which are a current synchronous phase angle sine value and a current synchronous phase angle cosine value of the power grid through processing of a synchronous phase locking unit, obtaining three-phase reference voltages of the photovoltaic grid-connected inverter according to four obtained voltage positive and negative sequence components, four obtained current positive and negative sequence components and four current positive and negative sequence component set values which are set according to output power of a photovoltaic cell panel through a current control unit, and obtaining a PWM switching signal corresponding to the three-phase inverter according to the three-phase reference voltages and bipolar triangle carrier signals through a PWM wave generating unit to achieve the low-voltage ride-through control of the photovoltaic grid-connected inverter. The positive and negative sequence component separation method of the low-voltage ride-through control of the photovoltaic grid-connected inverter is simple and reliable in method and good in practicability.

Description

technical field [0001] The invention belongs to the technical field of smart grid voltage control, and relates to a positive and negative sequence component separation method for low voltage ride-through control of photovoltaic grid-connected inverters. Background technique [0002] As the installed capacity of photovoltaic grid-connected power generation systems increases year by year, when the grid voltage is unbalanced or the AC system has an asymmetric fault, a large number of negative sequence components and non-characteristic harmonics will be generated on both sides of the converter station. If the weight is light, it will cause a system fault protection action, and if it is heavy, it will seriously threaten the safety of the converter device and endanger the stability and reliability of the three-phase power grid. Therefore, when a short-circuit fault occurs in the power grid and the voltage drops, it is necessary to solve the problem of how to adopt corresponding co...

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
IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 安少亮孙向东张琦王建渊宋卫章
Owner XIAN UNIV OF 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