Method for expanding tie line power feasible region of interconnected power grid

A tie-line power and interconnection grid technology, which is applied to the expansion of the feasible domain of tie-line power in the interconnection grid

Active Publication Date: 2020-03-13
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Few studies currently focus on the identification of key influencing factors in the feasible domain and the analysis of expansion strategies

Method used

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  • Method for expanding tie line power feasible region of interconnected power grid
  • Method for expanding tie line power feasible region of interconnected power grid
  • Method for expanding tie line power feasible region of interconnected power grid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] The method for expanding the power feasible region of interconnected grid tie lines mainly includes the following steps:

[0110] 1) Establish an economic dispatch model with coupled variables.

[0111] The main steps to establish an economic dispatch model with coupled variables are as follows:

[0112] 1.1) Establish objective function Among them, P G Output power for the generator set. h 1 and H 2 is the coefficient matrix. The superscript T means transpose.

[0113] In most electricity markets, the objective function is denoted as P G the quadratic function of .

[0114] 1.2) Determine the constraints of the objective function.

[0115] The power supply and power demand balance constraints are as follows:

[0116] e G P G +e D P D +e B P B =0. (1)

[0117] In the formula, e G and e D represents a unit vector.

[0118] The generator capacity constraints are as follows:

[0119] (2)

[0120] In the formula, and represent the lower and upper b...

Embodiment 2

[0223] An experiment to verify the method of expanding the power feasible region of interconnected grid tie lines mainly includes the following steps:

[0224] 1) Use the IEEE 118 node test system to build the experimental environment, which are as follows:

[0225] Case 1: Take nodes 5 and 60 as boundary nodes and connect them with AC tie lines.

[0226] Case 2: Take nodes 5 and 60 as boundary nodes to connect AC tie lines; take node 20 as boundary nodes to connect DC tie lines.

[0227] 2) Determine the comparison method, namely:

[0228] M0: the method for expanding the power feasible region of the tie line of the interconnected grid in Embodiment 1.

[0229] M1: Literature "W.Lin, Z.Yang, J.Yu, G.Yang and L.Wen, "Determination of TransferCapacity Region of Tie Lines in Electricity Markets: Theory and Analysis", vol.239, pp.1441-1458 , 2019." The proposed determination method.

[0230] M2: The method proposed in the document "D. Bertsimas and J. N. Tsitsiklis, Introductio...

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Abstract

The invention discloses a method for expanding a tie line power feasible region of an interconnected power grid. The method mainly comprises the following steps of 1) establishing an economic dispatching model with a coupling variable; 2) determining the tie line power feasible region based on an improved multi-parameter planning theory; 3) expanding the tie line power feasible region. According to the method, the tie line power feasible region can be rapidly determined, and the feasible region is effectively expanded by identifying the key factors of the tie line power feasible region.

Description

technical field [0001] The invention relates to the field of power system economic optimization calculation, in particular to a method for enlarging the power feasible region of tie lines of interconnected power grids. Background technique [0002] With the increase in power demand and the integration of renewable energy, it is difficult for a single regional power grid to ensure the balance of power supply and demand. In order to achieve optimal utilization of resources in a larger area, regional grid interconnection has become a common choice. The tie-line power feasible region is very important to the safe and economical operation of the power system. [0003] On the one hand, the accuracy of the feasible region ensures the safety and economy of the power system when regional power transmission is required; on the other hand, the larger feasible region indicates that the tie-line power transmission between regional grids can allow a wider transmission range This facilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 杨知方余娟林伟朱正春
Owner CHONGQING UNIV
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