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A security analysis method for active distribution network based on safety distance

A technology of safety distance and safety analysis, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problem of not distinguishing between the safety boundary and the state space boundary, unable to intersect with the boundary, and the change of the state quantity of the working point is not completely reflected, etc. question

Inactive Publication Date: 2019-09-17
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Reference [9] is aimed at the traditional distribution network, not applicable to the active distribution network with DG (distributed power generation); GSD and FSD are the displacement of the working point in geometric space, and the change of the state quantity of the working point does not fully reflected;
[0006] 2. In reference [9], GSD and FSD sometimes cannot intersect with the boundary because of the occlusion of other security boundaries or state space boundaries; there is no distinction between security boundaries and state space boundaries, and the operating point can cross the security boundary, but it is impossible to cross the state space boundary

Method used

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  • A security analysis method for active distribution network based on safety distance
  • A security analysis method for active distribution network based on safety distance
  • A security analysis method for active distribution network based on safety distance

Examples

Experimental program
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Embodiment 1

[0060] A security analysis method for active distribution network based on safety distance, see figure 1 , the method includes the following steps:

[0061] 101: Construct the full-quadrant security domain of the active distribution network, and the security boundary of the active distribution network composed of N-0 and N-1 security constraints when taking the equal sign;

[0062] 102: Obtain the spatial geometric distance of the working point moving from one position a to another position b, and the change amount of the system state;

[0063] 103: Define the shortest / longest safety distance, the shortest / longest safety distance in the safety zone, the vertical safety distance, and the axial safety distance;

[0064] 104: Calculate the shortest geometric safety distance, the longest geometric safety distance, the shortest and longest state safety distance, the shortest and longest safety distance in the safety domain, the vertical safety distance, the axial safety distance, ...

Embodiment 2

[0083] Combined with the specific calculation formula, figure 2 , image 3 1. Examples further introduce the scheme in Example 1, see the following description for details:

[0084] 201: Active distribution network security boundary;

[0085] The calculation of the safety distance needs to be based on the full quadrant safety region (TQSR) model of the active distribution network [10] , the model is as follows:

[0086] Ω TQSR ={W=[P L1 ,...,P Lm ,P DG1 ,...,P DGn ]∈Θ

[0087] State Space Range Constraints:

[0088]

[0089] Normal operation constraints:

[0090]

[0091] N-1 security constraints:

[0092]

[0093] In formula (1), W represents the working point, Θ represents the state space; P Li is the load L i Power; P DGi Distributed power supply DG i output; for L i , the value range of i is 1~m, for DG i , the value range of i is 1~n; P Li,max and P DGi,max means L i Power and DG i Output upper limit; P Bi means line B i power, Ω(B i ) ...

Embodiment 3

[0199] The following combined with specific examples, Figure 4 , Figure 5 The scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0200] 1. Basic situation of the example

[0201] exist Figure 4In the example of active distribution network, the line capacity is set to 1MVA, and the load power range is [0,1.5]MVA. In order to study access to a high proportion of DG, expand the range of DG output to [-1,0]MVA.

[0202] Two, the implementation steps of the present invention

[0203] (1) Safety boundary calculation results

[0204] Security Boundary:

[0205] N-0: boundary B1+ is P L2 = 1

[0206]

[0207] Security boundary B is composed of N-0 and N-1 security boundaries.

[0208] Among them, B1+, B2+, B3+ are positive power flow boundaries, B4- is reverse power flow boundaries; B1+, B2+ are also straight line boundaries, and B3+, B4- are also oblique line boundaries. It should be noted that each bound...

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Abstract

The invention discloses a safety analysis method of an active distribution network based on safety distances, comprising the steps of constructing an active distribution network safety boundary composed of an active distribution network full-quadrant safety domain and N-0 and N-1 safety restraints employing equal size; acquiring a spatial geometric distance of a working point from position a to position b and variation of system state; defining a shortest / longest safety distance, a safety domain shortest / longest safety distance, a vertical safety distance, and an axial safety distance; calculating a shortest geometric safety distance, a longest geometric safety distance, shortest and longest state safety distances, safety domain shortest and longest safety distances, a vertical safety distance, an axial safety distance, and a domain axial distance; performing safety judgment, safety level analysis, boundary-crossing direction analysis and positive and reverse boundary-crossing analysisbased on the safety distances. The method can precisely provide the most dangerous and safest directions of variation for a current working point as well as margins in these directions.

Description

technical field [0001] The invention relates to the field of intelligent distribution network planning, in particular to a safety distance-based active distribution network security analysis method. Background technique [0002] The traditional method of distribution network security analysis is to obtain security information based on N-1 simulation [1,2] . The security domain describes the operating range of the grid that satisfies the security constraints [3] , the security domain-based security analysis method has advantages in speed and information over N-1 simulation [4] . The distance from the working point (system state) to the boundary of the safety domain is called the safety distance, and the safety distance is of great significance to the operation of the power grid [5,6] . [0003] The concept of safety distance comes from the transmission network. In the safety analysis of the transmission network, the distance between an injection point and the boundary su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 肖峻林启思左磊周欢唐亮孙辰军王卓然
Owner TIANJIN UNIV