A calculation method for grid-connected capacity limit of photovoltaic multi-infeed power system

A technology of power system and calculation method, which is applied in the field of grid-connected capacity limit calculation of photovoltaic multi-infeed power system, can solve problems such as restricting the grid-connected scale of new energy units, achieve excellent results and application value, and reduce small disturbance stability problems , Calculate the effect of clear thinking

Active Publication Date: 2022-04-01
ZHEJIANG UNIV +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that after the increasing photovoltaic grid-connected capacity is connected, the power system presents a significant power electronic characteristic, which is prone to small disturbance stability problems, which restricts the grid-connected scale of new energy units

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
  • A calculation method for grid-connected capacity limit of photovoltaic multi-infeed power system
  • A calculation method for grid-connected capacity limit of photovoltaic multi-infeed power system
  • A calculation method for grid-connected capacity limit of photovoltaic multi-infeed power system

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0057] Specific implementation according to the complete method of the present invention, for example,:

[0058] Constructing photovoltaic five feeding power systems in Matlab / Simulink software, such as figure 1 Indicated. PV equipment in the five feed system is a typical voltage source inverter. Inverter outer ring adopts constant stream voltage U dc Control, such as figure 2 Indicated. figure 2 The physical significance of each variable is shown in Table 1 below:

[0059] Table 1 U dc Control the inverter variable corresponding table

[0060]

[0061]

[0062] U dc The parameter values ​​of the control inverter variable are shown in Table 2:

[0063] Table 2 Implementation of the parameter value of the inverter variable in the simulation verification

[0064] DC side injection power P in / P.u.

1 DC capacitor voltage reference value u dcref / P.u.

1 Inner ring Q-axis current reference value i cqref / P.u.

0 DC voltage control PI link parameter k ...

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 capacity limit calculation method of a photovoltaic multi-infeed power system. For the photovoltaic multi-infeed power system, the extended admittance matrix is ​​calculated, and the generalized short-circuit ratio and the generalized short-circuit ratio critical value of the photovoltaic multi-infeed power system are obtained; the absolute value of the difference between the generalized short-circuit ratio and the generalized short-circuit ratio critical value satisfies the given Set the threshold, calculate the sensitivity of the generalized short-circuit ratio of the photovoltaic multi-infeed power system to the rated capacity of each photovoltaic equipment, and fine-tune and increase the capacity of the photovoltaic equipment; recalculate the sensitivity, and adjust the rated capacity of the fan equipment again according to the sensitivity, and continue iterative processing to obtain capacity limit. The method of the invention has a clear calculation idea and a simple process, can obtain the maximum value of the grid-connected capacity of the photovoltaic multi-feed power system under the condition of a small disturbance stability margin, and provides guidance for the new construction and expansion of the photovoltaic power station from the perspective of small disturbance stability, which is helpful The comprehensiveness of power system planning and design considerations.

Description

Technical field [0001] The present invention belongs to the field of new energy planning and design, involving a method of calculating a power system capacity, and is specifically related to presenting a plurality of photovoltaic multi-feed power systems grid-network capacity limit calculation methods. Background technique [0002] With the intensification of the global energy crisis and the increasing environmental situation, the new energy unit represented by photovoltaic is gradually increased in the power system, and has become the trend of future energy development. However, different from the large-scale new energy access in Europe and the United States, the dispensing of energy, my country's energy load distribution is unbalanced, and there are many wells in the Northwest, far from the eastern load center, long-term existence of large-scale long-range transportation, high The proportional multi-Papo collection network has become an important trend in the future development...

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): H02J3/38
CPCH02J3/383H02J2203/20Y02E10/56
Inventor 辛焕海梁慧宇袁辉吴浩朱承治
Owner ZHEJIANG 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