Carrier frequency conversion control method

A carrier frequency conversion and control method technology, which is applied in harmonic reduction devices, AC networks to reduce harmonics/ripple, photovoltaic power generation, etc., and can solve the problems of difficult filter design, reduction of inverter power quality, and poor real-time performance.

Inactive Publication Date: 2013-02-13
XI AN JIAOTONG UNIV
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the width of the hysteresis loop is fixed, and the switching frequency of the power device changes with the change of the instantaneous value of the current, it brings difficulties to the design of the output filter. The filter parameters can only be designed according to the lowest harmonic frequ

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
  • Carrier frequency conversion control method
  • Carrier frequency conversion control method
  • Carrier frequency conversion control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The photovoltaic power generation system of this embodiment is such as image 3 As shown, it includes photovoltaic cell components, DC-DC converters, DC-AC inverters, LC filters, and a microprocessor that plays a role in regulating the entire power generation system. The composition of the DC-DC converter is detailed in "Power Electronics Technology" (Editor-in-Chief Wang Zhaoan, Liu Jinjun, Mechanical Industry Press, 2011, 5th edition). Figure 5-2 on page 123 includes photovoltaic modules (DC source), Piezoelectric inductors, diodes, IGBTs and stabilized capacitors. The positive terminal of the output of the photovoltaic module (DC source) is connected to one end of the inductor, the other end of the inductor is connected to the anode of the diode and the collector of the IGBT, the cathode of the diode is connected to one end of the capacitor, and the other end of the capacitor is connected to the IGBT emitter and then the negative terminal of the output of the photovol...

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 relates to a carrier frequency conversion control method, belonging to the field of power supply technologies. According to the method, the carrier frequency conversion control is realized through the following cycle steps of: storing a mutual restraint relationship table of predetermined current deviation values and carrier frequencies; finding a nearest predetermined current deviation value from the relationship table according to an actually-measured current deviation value, and selecting a carrier frequency corresponding to the predetermined current deviation value; and generating a PWM (Pulse Width Modulation) signal according to the selected carrier frequency, and outputting the PWM signal to a switching device which controls a DC-AC (Direct Current to Alternating Current) inverter so as to enable the actual value of the output current to be close to a target value of the output current. The carrier frequency conversion control method has the remarkable advantages of high response speed, low switching loss, easiness in filter design, and the like.

Description

Technical field [0001] The invention relates to a control method of power supply quality of a power grid, in particular to a carrier frequency conversion control method, belonging to the technical field of power supply. Background technique [0002] The photovoltaic grid-connected system is essentially a parallel operation system of a constant voltage source and a variable current source. [0003] In order not to affect the power supply quality of the power grid, the operating characteristics of the power grid access equipment must be controlled. For power generation equipment, it is necessary to control the output AC current and the grid voltage to be consistent in frequency and phase. At present, the grid-connected current control strategies commonly used are SPWM and hysteresis control. [0004] SPWM control: The command current is compared with the real-time value of the grid-connected current. The current error is processed by the PI regulator and compared with the triangular ...

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): H02J3/38H02J3/01
CPCY02E10/563Y02E10/56Y02E40/40
Inventor 陈晓菊黄晶晶张爱民张杭王建华张蕾王在福郎学斌
Owner XI AN JIAOTONG 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