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

Three-phase photovoltaic grid-connected inverting control method

A control method and photovoltaic technology, applied in the field of solar photovoltaic power generation, can solve problems such as low efficiency, easy oscillation, slow system response speed, etc.

Inactive Publication Date: 2012-10-24
天威新能源系统工程(北京)有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current existing technology uses the current command and the actual current error to adjust and control through PID, which has the defects of slow system response, static error, low tracking accuracy, and low efficiency; moreover, it is prone to oscillation when the light changes , poor reliability

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
  • Three-phase photovoltaic grid-connected inverting control method
  • Three-phase photovoltaic grid-connected inverting control method
  • Three-phase photovoltaic grid-connected inverting control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] Its specific method and device structure are illustrated as follows by way of example:

[0053] Such as figure 1 , is the structure of the inverter of the present invention: including an air circuit breaker QK connected to the power grid in sequence, a three-phase isolation transformer T, a three-phase high-frequency filter reactor L, a three-phase IGBT bridge arm, a DC capacitor, an anti-reverse diode, a photovoltaic Panel components PV etc. One end of the isolation transformer T is connected to the power grid, and the other end is connected to the dry-type reactor; the other end of the dry-type reactor is connected to the midpoint of the bridge arm of the IGBT insulated gate transistor; the positive end of the IGBT bridge arm is connected to the positive end of the DC capacitor C to prevent The cathode of the reverse diode D is connected to the positive terminal of the DC capacitor C, the anode of the reverse diode D is connected to the positive terminal of the photo...

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 aims at providing a three-phase photovoltaic grid-connected inverting control method and a device thereof, relating to the technical field of solar energy power generating. The method and device gather secondary side line voltages u<ab>, u<bc> and u<ca>, and currents i, i and i<c> of a grid-connected isolation transformer, DC voltage Ud and current i<dc> of a panel; magnitude of grid-connected command current is obtained according to maximum power point tracking (MPPT); switching time is calculated by adopting deadbeat predictive current control strategy; on and off of a main circuit switch element are controlled by a controller according to the calculated time, thereby realizing control of grid-connected current. The invention can ensure system current to track the variation of the command current in a control cycle (us level), realize controllable power factor, low harmonic grid-connected current and steady and astatic system and has the characteristics of fast response speed, high tracking accuracy and efficiency, good reliability, etc.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation. Background technique [0002] The three-phase photovoltaic grid-connected inverter inverts the DC power generated by the photovoltaic cells into AC power with the same frequency as the grid, and sends the power to the grid through the power distribution system. Grid-connected photovoltaic system is the development direction of photovoltaic power station. Compared with isolated solar photovoltaic power station, it has the following advantages: ① Photovoltaic cells can always operate at the maximum power point, and the grid absorbs all the electric energy generated by the solar power station, improving The power generation efficiency of the solar power station is improved; ② The battery is omitted as an energy storage link, which reduces the system cost; ③ The energy loss in the charging and discharging process of the battery is saved, and the system efficiency is improv...

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): H02J3/38H02N6/00H02J3/01H02J3/18
CPCY02E10/563Y02E40/30Y02E10/56Y02E40/40
Inventor 张喜军任晓鹏穆桂霞焦翠坪赵志强王保利
Owner 天威新能源系统工程(北京)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