A three-phase interval state estimation method for active distribution network with node injection power uncertainty
A technology of node injection power and active distribution network, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of increased time complexity and difficulty in obtaining probability density functions.
Active Publication Date: 2020-04-21
SOUTHEAST UNIV +1
View PDF5 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the state estimation based on probability distribution and fuzzy theory must obtain the detailed prior probability density function or membership function of each uncertainty variable in advance. On the one hand, it is easy to increase the time complexity of the algorithm solution. In addition to the probability distribution of conventional power loads that can be simply known based on a large amount of historical power consumption data, it is difficult to obtain the complete probability density function of distributed power generation such as photovoltaics and wind power. In most cases, only the upper and lower limits of its power fluctuations are known.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0130] The technical solutions of the present invention will be described in detail below, but the protection scope of the present invention is not limited to the embodiments.
[0131] Such as figure 1 As shown, the method for estimating the three-phase interval state of the active distribution network with node injection power uncertainty of the present invention includes the following steps:
[0132] Step 1: Quantitatively describe the uncertainty of system measurements such as pseudo-measurement of injected power of network nodes and real-time measurement of branches including photovoltaic power generation, wind power generation and electric vehicle charging by using interval numbers.
[0133] At present, most short-term power prediction models of photovoltaic power generation systems use deterministic point prediction, that is, to give a certain power value of photovoltaic output at a certain time in the future. Obviously, this point-value power prediction method ignores t...
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
Login to View More Abstract
The invention discloses an active power distribution network three-phase interval state estimation method containing node injection power uncertainty. The method includes: performing modeling and analysis on an uncertainty problem of measuring errors of the node injection power by pseudo measurement and real-time measurement apparatuses by employing an interval number; establishing an active power distribution network three-phase interval state estimation mathematical model considering the uncertainty; splitting the established active power distribution network interval state estimation model into two optimization problems including non-linear interval constrained conditions; and performing effective solution on the established active power distribution network three-phase interval state estimation mathematical model with the combination of a sparse matrix technology by employing a linear programming method based on iterative operation. According to the method, the defect that in the current power distribution network state estimation, the output intermittence of distributed power supplies and the charging of electric vehicles are neglected is overcome, the measuring precision and the solving speed of the algorithm are improved, and theoretical support is provided for next safety assessment of the active power distribution network.
Description
technical field [0001] The invention relates to a method for estimating a three-phase state of an active distribution network, in particular to a method for estimating a three-phase interval state of an active distribution network with node injection power uncertainty. Background technique [0002] Actively developing renewable energy power grid-connected technology and electric vehicle grid-connected technology is a strategic choice for my country to adjust energy structure, cope with climate change, transform economic development mode and achieve sustainable development. In the future, the grid-connected power generation of multi-type distributed power sources with high penetration rate, active loads such as electric vehicles, and the large-scale access and application of a large number of intelligent terminal equipment will gradually transform the traditional one-way radial distribution network into a multi-energy power supply system. , Auxiliary active distribution netwo...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J3/003H02J2203/20
Inventor 吴在军徐俊俊徐怡悦窦晓波顾伟袁晓冬
Owner SOUTHEAST UNIV