Sine wave inverter capable of working in parallel and controlling method thereof

An inverter and sine wave technology, which is applied in the field of parallel control of sine wave inverters, can solve the problems of reducing system reliability and increasing system hardware complexity, and achieves the effect of high reliability and strong communication immunity

Inactive Publication Date: 2009-11-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main disadvantage of this parallel scheme is that the same-frequency and same-phase control of the square-wave synchronous signals of each parallel inverter must be completed through two signal interconnection lines between each inverter, and the existence of signal interconnection lines still increases the The hardware complexity of the system reduces the reliability of the system

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
  • Sine wave inverter capable of working in parallel and controlling method thereof
  • Sine wave inverter capable of working in parallel and controlling method thereof
  • Sine wave inverter capable of working in parallel and controlling method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Parallel-connectable inverter and on-line uninterruptible power supply UPS principle block diagram of the present invention are as follows image 3 shown. In the figure, the PLC and the synchronous control digital signal processor DSP control the power line communication PLC chip and its peripheral circuits to realize the information transmission between the inverters through the power line at the total output end of the UPS, which is synchronous control and current sharing control based on power difference adjustment. Provide a basis for adjustment. The reference phase signal u output by the PLC of each inverter and the synchronous control digital signal processor DSP squ Keep the same frequency and phase as the input signal of the digital signal processor DSP for inverter and current sharing control. Inversion and current sharing control The function of the digital signal processor DSP is to control the output sine wave voltage of the inverter, and to control the eq...

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 sine wave inverter which can work in parallel and a control method thereof, belonging to a sine wave inverter. Including inverter circuit and inverter control circuit, the inverter control circuit includes PLC chip and its peripheral control circuit, power line, PLC and synchronous control DSP, inverter and current sharing control DSP, voltage sampling and shaping circuit, output voltage sampling circuit , Output current sampling circuit, drive control circuit. PLC and synchronous control DSP adjust the voltage reference sinusoidal signal of each inverter to keep the same frequency and phase. Calculate the power difference by power, and use the power difference to fine-tune the phase and amplitude of the reference signal respectively to realize current sharing control. The invention does not need signal interconnection wires, has strong communication immunity and high reliability, and is applied to a sine wave inverter control system without signal interconnection wires to realize complete electrical isolation and hot swapping of each inverter.

Description

1. Technical field [0001] The invention belongs to the technical field of parallel control of sine wave inverters, and in particular relates to a method and realization technology for parallel operation of single-phase and three-phase sine-wave inverters, single-phase and three-phase on-line uninterruptible power supplies (UPS), and the like. 2. Background technology [0002] The control block diagram of an existing sine wave inverter that can work in parallel is as follows: figure 1 As shown, it includes two parts: a power unit composed of an inverter circuit and an inverter control unit. The inverter control unit mainly includes a voltage sampling and shaping circuit, an output voltage sampling circuit, a reference sinusoidal signal generator, a voltage regulator and a drive control circuit. ; It is characterized in that it also includes a synchronous control unit connected between the voltage sampling and shaping circuit and the reference sinusoidal signal generator and a...

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): H02M7/48H02M7/493
Inventor 何中一邢岩祁飚杰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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