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Short-circuit current suppression method considering unit start-stop and line switching

A short-circuit current, unit start-stop technology, applied in the field of electrical information, can solve problems such as non-optimal results, failure to consider the influence of unit short-circuit current, and inaccurate expressions

Active Publication Date: 2021-05-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of inaccurate expression, non-optimal solution of obtained results, and failure to consider the influence of units on short-circuit current in existing studies on line switching and current limiting, combined with the mixed integer linear programming method, the research takes into account the start and stop of units and the display of line switching and switching. Optimal dispatching of power systems under the constraint of formula short-circuit current, that is, short-circuit current suppression method. The purpose of the present invention is to provide a short-circuit current suppression method considering unit start-stop and line switching

Method used

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  • Short-circuit current suppression method considering unit start-stop and line switching
  • Short-circuit current suppression method considering unit start-stop and line switching
  • Short-circuit current suppression method considering unit start-stop and line switching

Examples

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Embodiment

[0204] In order to verify the validity and versatility of the proposed model and the accuracy of the explicit expression of short-circuit current, an example analysis is carried out using the IEEE30 node system. The fuel cost is 5$ / MBtu, the unit subtransient reactance ranges from 0.04 to 0.055, and the maximum number of line switching is 4. The following three calculation examples are set up.

[0205] Calculation example 1: Since the size of the load directly affects the short-circuit current level of the system, and to verify the adjustment effect of the unit start-stop on the short-circuit current, considering the system safety and economy of the comprehensive short-circuit current suppression method for unit start-stop and line switching, according to Three typical times of 5 o'clock, 11 o'clock and 21 o'clock in a day are respectively selected for heavy, medium and small loads, and four operating modes are considered for analysis and comparison, as follows:

[0206] Mode...

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Abstract

The invention discloses a short-circuit current suppression method considering unit start-stop and line switching, which comprises the following steps that firstly, a relational expression of an admittance matrix and short-circuit current is deduced by utilizing a relation between the node admittance matrix and a node impedance matrix and physical significance of node self-impedance; further the change of ground capacitance after the line is cut off and the influence of the switching line and the start-stop unit on the admittance matrix are considered to obtain a short-circuit current explicit expression; from the perspective of global optimization of the power grid, the influence of economy and current limiting measures on the aspects of system power flow, unit output and the like is comprehensively considered, and a mixed integer linear programming method considering explicit short-circuit current constraint is provided by taking the minimum power generation cost, unit start-stop cost and line switching cost as targets; and meanwhile, a day-ahead scheduling problem of a power system is combined, unit output arrangement and line switching are comprehensively optimized by considering short-circuit current constraints, and an optimal unit start-stop and line switching comprehensive scheduling operation scheme is given on the premise of ensuring economic operation.

Description

technical field [0001] The invention relates to the technical field of electrical information, in particular to a short-circuit current suppression method considering the start-up and stop of a unit and line switching. Background technique [0002] Due to the rapid growth of power load demand caused by rapid economic development and the rapid increase of power supply capacity, the short-circuit current level in the power system is getting higher and higher, and the problem of excessive short-circuit current is becoming more and more obvious. Therefore, how to limit the short-circuit current has become a problem that must be faced in the planning, dispatching and operation of the power grid. [0003] Limiting short-circuit current can start from many angles. Starting from the operation mode, it can be operated through the partition of the power grid. Although the short-circuit current can be reduced, it weakens the connection between the power grids and causes uneven power f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/46G06F30/20G06Q10/04
CPCG06Q10/04G06F30/20G06F2111/04H02J3/00H02J3/008H02J3/466H02J2203/20
Inventor 刘天琪华浩丞何川
Owner SICHUAN UNIV
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