Distributed and centralized coordinated two-stage filter implementation method applied to photovoltaic power plants

A photovoltaic power station and two-stage filtering technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as harmonic amplification and unbalanced output of photovoltaic power stations, reduce compensation burden, simplify equipment operation management, reduce The effect of footprint

Active Publication Date: 2022-06-28
HUNAN UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the randomness and fluctuations of photovoltaic power generation, the passive filter is easy to match with the grid impedance, causing resonance and even harmonic amplification.
In addition, the output of photovoltaic power plants is not balanced within a day, resulting in a large margin for the reactive power compensation design capacity of the filter
At present, there is no cost-effective solution in the field of power quality management of photovoltaic power plants

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
  • Distributed and centralized coordinated two-stage filter implementation method applied to photovoltaic power plants
  • Distributed and centralized coordinated two-stage filter implementation method applied to photovoltaic power plants
  • Distributed and centralized coordinated two-stage filter implementation method applied to photovoltaic power plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] See figure 1 , the photovoltaic power station of the present invention includes three power generation areas. Two photovoltaic inverters and an integrated filter reactance split transformer form a power generation unit. 20 power generation units form a power generation area, and the output current is sent to the 110kV grid-connected booster station after the 35kV collection line is converged.

[0023] The primary filter station of the present invention is arranged at the integrated box-type transformer inside a single power generation area. like figure 2 As shown in the figure, the integrated filter reactance type split transformer can be regarded as a three-phase five-winding transformer: one high-voltage winding and two low-voltage windings form a split transformer, and the remaining two windings are integrated circuits that have been decoupled from other power supply windings. filter reactor. A single integrated filter reactor is made up of two sub-coils with 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 discloses a two-stage filter implementation method of decentralized and centralized coordination applied to a photovoltaic power station. The photovoltaic power station is provided with a primary and secondary filter station composed of an integrated filter box-type transformer and an induction filter grid-connected transformer; The first-level power station is set in each box-type split transformer inside the power generation area, and the filter reactor is integrated inside the transformer to reduce the installation space; the second-level filter station is set in the grid-connected step-up station, and the grid-connected transformer uses induction filtering technology to damp Harmonic resonance phenomenon; the two-stage filter stations coordinate with each other to suppress characteristic sub-harmonics, which has the characteristics of decentralized filtering of harmonics and centralized improvement of power quality. The photovoltaic power station has a simple structure and is convenient for integrated design, and device parameters can be adjusted according to actual needs, and can be applied to photovoltaic power stations of different scales.

Description

technical field [0001] The invention relates to the technical field of power quality management of photovoltaic power plants, in particular to a method for realizing decentralized and centralized coordinated two-stage filtering applied to photovoltaic power plants. Background technique [0002] With the maturity of new energy power generation technology, the penetration rate of photovoltaic power generation system output power in the power system continues to increase. Large-scale photovoltaic power stations use inverters as the interface for AC and DC power conversion between photovoltaic arrays and the grid, and the inverter device discharges a large amount of harmonics and reactive currents to the grid due to its inherent nonlinear characteristics, which seriously affects the power quality of the grid connection point. . [0003] In order to meet the power quality requirements of grid-connected photovoltaic power plants, the current practice is to connect passive filter ...

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): H02J3/01H02J3/38
CPCH02J3/383H02J3/01Y02A30/60
Inventor 刘乾易李勇帅智康罗隆福曹一家
Owner HUNAN 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