Optical storage collaborative low-voltage ride through method for improving system frequency stability

A low-voltage ride-through, system frequency technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of deterioration of frequency characteristics, frequency offset of grid connection points, inability to ensure active power, etc., to improve frequency stability, Realize the effect of active power

Pending Publication Date: 2022-05-27
JIANGSU ELECTRIC POWER CO +1
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the photovoltaic power station performs low-voltage ride-through in the weak grid, due to its own capacity limitation, it cannot ensure the output of active power, which causes the frequency characteristics of the system to deteriorate and the frequency of the grid-connected point to shift

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
  • Optical storage collaborative low-voltage ride through method for improving system frequency stability
  • Optical storage collaborative low-voltage ride through method for improving system frequency stability
  • Optical storage collaborative low-voltage ride through method for improving system frequency stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The following embodiment of a photo-storage synergistic low-voltage ride-through method of improving the stability of the system frequency is described in detail below in conjunction with the accompanying drawings.

[0022] Figure 1 is the topology of the optical storage synergy system in an embodiment of the present invention. The topology of the optical storage synergy system includes a photovoltaic unit (PV), an energy storage device (ESU), a photovoltaic / energy storage converter, a photovoltaic / energy storage LCL filter, a parallel point, a line impedance and a power grid.

[0023] Figure 2 For the control flowchart of the present invention, the specific steps of the photostorescence synergistic low voltage ride-through method of the present invention are as follows:

[0024] Step (1): Obtain the parallel dot voltage signal, and use a double-second-order generalized integrator to separate the positive and negative sequence fractions of the tie point voltage;

[00...

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 provides an optical storage collaborative low-voltage ride-through method for improving system frequency stability, which comprises the following steps of: (1) acquiring a voltage signal of a grid-connected point, and separating positive and negative sequence components of the voltage of the grid-connected point; (2) analyzing the voltage drop condition of the power grid, and determining the time for realizing low voltage ride through; (3) generating a reactive current reference instruction for providing power grid voltage support, providing reactive power through energy storage to carry out low voltage ride through, providing active power through photovoltaic power to ensure the system frequency stability, and realizing optical storage collaborative low voltage ride through; (4) judging whether the grid-connected point voltage is supported within a specified time or not, if so, after a power grid fault is solved, recovering an energy storage control strategy, and performing grid-connected operation of the optical storage system; and otherwise, controlling the optical storage system to be safely offline. The invention provides a light-storage collaborative low-voltage ride-through method for improving the system frequency stability. The frequency stability of a high-permeability distributed photovoltaic power generation system in the low-voltage ride-through period can be enhanced.

Description

Technical field [0001] The present invention belongs to the field of photovoltaic power station low voltage ride-through technology, particularly relates to a light storage collaborative low voltage ride-through method to improve the stability of the system frequency. Background [0002] Due to the characteristics of high permeability distributed photovoltaic power generation system with low inertia and weak immunity, the power grid shows the characteristics of a weak grid and an extremely weak power grid. [0003] At this stage, the research on low-voltage ride-through technology of distributed photovoltaic power generation system mainly focuses on the photovoltaic power station itself, and the photovoltaic power station will inject a certain dynamic reactive current into the power grid to help the grid voltage recovery. However, when the photovoltaic power station is driven through with low voltage in the weak grid, due to the limitation of its own capacity, it is impossible to...

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): H02J3/24H02J3/38H02J3/50H02J3/48
CPCH02J3/241H02J3/381H02J3/50H02J3/48H02J2300/24Y02E40/30
Inventor 闫怀东宋振浩沙骏吕志鹏冯定东张引胥峥周磊
Owner JIANGSU ELECTRIC POWER CO
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