Operational risk assessment method for large-scale photovoltaic grid-connected distribution networks

A technology of operation risk and distribution network, applied in AC network circuits, load forecasting in AC network, electrical components, etc., can solve problems such as large impact and complex grid structure, and achieve the effect of improving safety

Inactive Publication Date: 2018-11-27
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
View PDF4 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an important part of the new power system, the distribution network with distributed photovolt

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
  • Operational risk assessment method for large-scale photovoltaic grid-connected distribution networks
  • Operational risk assessment method for large-scale photovoltaic grid-connected distribution networks
  • Operational risk assessment method for large-scale photovoltaic grid-connected distribution networks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0051] 1. First, a real-time prediction model for photovoltaic output and load fluctuations was established

[0052] The output of the photovoltaic power generation system is related to the solar radiation intensity and temperature where the photovoltaic array is located. In a short period of time, the light intensity obeys the normal distribution. The power output of a photovoltaic array is determined by two factors: the conversion efficiency of photovoltaic cells and the incident solar radiation. The output power formula of a solar photovoltaic array is:

[0053] P m =μ·S ab ·I T (1)

[0054] In the formula: S ab Is the total area of ​​the solar photovoltaic array, equal to the product of the unit area of ​​a battery and the number of blocks; I T That is, the total radiation value incident on the photovoltaic cell; the conversion efficiency of ...

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

Provided is an operational risk assessment method for large-scale photovoltaic grid-connected distribution networks. The method comprises: establishing a real-time prediction model of photovoltaic output and load fluctuation; obtaining a probability density function and a cumulative distribution function of branch power flow and node voltage by using probability distribution of node voltage and branch power flow calculated by a Monte Carlo method; according to the cumulative distribution function, solving off-limit probability of each node voltage and branch power flow, calculating probabilityindexes, severity indexes and risk indexes of node voltage and branch power flow according to probability distribution of variables to be obtained, and evaluating security risk of photovoltaic connection to a distribution network, and based on a result, providing corresponding control measures. The method fully considers randomness and uncertainty of photovoltaic and load, adopts typical parameters as risk evaluation indexes, and accurately predicts risk of the distribution network based on Monte Carlo probability power flow, and has important practical significance for improving safety, reliability and economy of distribution network operation after photovoltaic grid connection.

Description

technical field [0001] The invention relates to a large-scale photovoltaic grid-connected distribution network operation risk assessment method, which belongs to the technical field of photovoltaic grid-connection. Background technique [0002] With the increasing demand for energy in the economic and social development and the increasingly serious problems of energy shortage and environmental pollution, distributed photovoltaic power generation has received more and more attention. As an important part of the new power system, the distribution network with distributed photovoltaics has a complex structure. Once a power outage occurs, it will quickly spread to a wide range. Therefore, it is of great economic and social value to accurately assess the risks of distribution networks, take relevant countermeasures in a timely manner, and ensure power supply reliability and power quality. [0003] At this stage, in order to solve the system risk caused by the randomness and vola...

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): G06Q10/06G06Q50/06H02J3/00
CPCG06Q10/0635G06Q50/06H02J3/00H02J3/003Y04S10/50
Inventor 曾伟孙旻陈波何伟黄扬琪乐健王曹何昊熊俊杰余侃胜
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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