Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Grid-connected resonance analysis method and system based on photovoltaic virtual synchronous generator

A virtual synchronous generator technology, applied in photovoltaic power generation, single grid parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the problem of rarely considering the influence of virtual synchronous generator parameter stability

Pending Publication Date: 2020-07-10
SHANGHAI UNIVERSITY OF ELECTRIC POWER
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing photovoltaic grid-connected resonance analysis has the following problems: At present, the research on large-capacity photovoltaic power plants at home and abroad mainly focuses on: 1. The stability analysis of traditional photovoltaic inverter grid-connected; 2. The stability of multi-inverter grid-connected Modeling the interaction with the large power grid; the established model is relatively simple, and rarely considers the parameters of the virtual synchronous generator and the influence of the special and complex structure of the photovoltaic virtual synchronous generator on the stability of the grid-connected 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
  • Grid-connected resonance analysis method and system based on photovoltaic virtual synchronous generator
  • Grid-connected resonance analysis method and system based on photovoltaic virtual synchronous generator
  • Grid-connected resonance analysis method and system based on photovoltaic virtual synchronous generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Through the coordination and cooperation of photovoltaic and energy storage, the photovoltaic virtual synchronous generator realizes the function of primary frequency modulation of the system, improves the damping characteristics and interference suppression ability of the system, and has been put into use in large quantities. Compared with the existing traditional virtual synchronous generator, the method of the present invention increases the complexity of the photovoltaic virtual synchronous generator (PV-VSG) system after connecting the energy storage converter, and the large-capacity photovoltaic virtual synchronous generator is connected to the weak grid Finally, it is easy to cause oscillation problems; by using the state space method to analyze the grid-connected resonance mechanism of photovoltaic virtual synchronous generators, not only can accurately determine the resonance frequency of the system, but also determine the influence of each parameter element on t...

Embodiment 2

[0165] refer to Figure 9 , is the second embodiment of the present invention. This embodiment is different from the first embodiment in that it provides a system based on photovoltaic virtual synchronous generator grid-connected resonance analysis, including an information module 100, an analysis module 200, The calculation module 300 and the information module 100 are used to construct the small signal model of the photovoltaic virtual synchronous generator connected to the grid and establish the state space matrix; the analysis module 200 is used to analyze the grid-connected resonance mechanism of the photovoltaic virtual synchronous generator and judge the resonance of each node Participation factors, components, and parameters affect the resonance law; the calculation module 300 is used to solve the eigenvalues ​​and left and right eigenvectors of the state space matrix, calculate the resonance participation factor, change the size of the components and parameters, and ob...

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 grid-connected resonance analysis method and system based on a photovoltaic virtual synchronous generator. An information module is used for establishing a photovoltaic virtual synchronous generator grid-connected small signal model; the analysis module analyzes the grid-connected resonance mechanism of the photovoltaic virtual synchronous generator by using a state spacestrategy in combination with the small signal model, and constructs a state space matrix; the calculation module is used for solving characteristic values and left and right characteristic vectors ofthe state space matrix, obtaining resonance participation factors of all nodes when grid-connected resonance of the photovoltaic virtual synchronous generator occurs, and respectively carrying out calculation processing; and the analysis module analyzes the influence of element parameters on resonance stability by using a Lyapunov analysis strategy and a resonance participation factor to obtain aresonance influence rule. According to the method, the influence of the grid-connected resonance mechanism, accurate parameters and elements of the photovoltaic virtual synchronous generator on the stability is analyzed through a state space strategy, and a theoretical basis is provided for parameter design and optimization of the photovoltaic virtual synchronous generator in actual engineering and evaluation of the photovoltaic grid-connected electric energy quality.

Description

technical field [0001] The invention relates to the technical field of grid-connected stability of new energy sources, in particular to a method and system for grid-connected resonance analysis based on photovoltaic virtual synchronous generators. Background technique [0002] Large-scale photovoltaic power plants must meet the requirements for stable operation of the power grid before they are put into operation, that is, photovoltaic power plants must have power supply performance characteristics, and can participate in the regulation of system frequency and voltage. Traditional photovoltaic inverters are connected to the grid. The rotating parts provide inertia response characteristics for the system, and cannot perform self-regulation and self-regulation of voltage. Through the coordination and cooperation of photovoltaic and energy storage, the photovoltaic virtual synchronous generator realizes the function of primary frequency modulation of the system, improves the da...

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 Applications(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/24
CPCH02J3/48H02J3/24Y02E10/56
Inventor 王华昕李丝雨赵永熹刘美娜褚启迪
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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
Eureka Blog
Learn More
PatSnap group products