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Economical dispatching method for AC/DC (alternating current/direct current) interconnected power grid

A technology for interconnecting power grids and economic dispatching, which is applied to AC network circuits, power transmission AC networks, and AC networks with the same frequency from different sources, etc. It can solve the problems that mixed integer nonlinear commercial solvers cannot give feasible solutions, etc.

Active Publication Date: 2018-06-29
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The existing AC-DC interconnection grid dispatching methods usually treat the modeling and solution of the AC-DC interconnection grid as a mixed integer nonlinear optimization problem; however, in engineering practice, directly using mixed integer nonlinear commercial solvers often cannot give a feasible Program

Method used

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  • Economical dispatching method for AC/DC (alternating current/direct current) interconnected power grid
  • Economical dispatching method for AC/DC (alternating current/direct current) interconnected power grid
  • Economical dispatching method for AC/DC (alternating current/direct current) interconnected power grid

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Embodiment

[0249] The effectiveness of the present invention was verified using several IEEE standard test systems. The calculation example analysis adds several typical applications of HVDC transmission systems to the IEEE standard test system, including multi-terminal HVDC transmission, HVDC connection to offshore wind power, and back-to-back HVDC systems. The calculation information is as follows:

[0250] IEEE 14 nodes: Added a multi-terminal DC transmission system connecting nodes 2, 4, and 6, and a flexible DC transmission line connecting nodes 3 and 9.

[0251] IEEE 30 node: Four offshore wind farms are added and connected to nodes 9, 15, 19 and 28 of the AC transmission system by flexible DC transmission lines.

[0252] IEEE 118 Nodes: Added the MTFCVDC system connecting nodes 36, 37 and 59 and the flexible DC transmission line connecting nodes 13 and 71. Five offshore wind farms were added, connected to nodes 15, 27, 44, 50 and 57 of the AC transmission system.

[0253] IEEE ...

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Abstract

The invention discloses an economical dispatching method for an AC / DC (alternating current / direct current) interconnected power grid and belongs to the field of economical dispatching of an electric power system. The method comprises steps as follows: firstly, establishing an optimal power flow model of economical dispatching of the AC / DC interconnected power grid consisting of objective functionsand constraint conditions, and converting the model into an optimal power flow continuous model of the AC / DC interconnected power grid with a fixed conversion transformer's tap changer gear, and performing solving; utilizing the optimal solution of the optimal power flow continuous model as an initial value, restoring an integer representing the conversion transformer's tap changer gear to be a variate, establishing an optimal power flow mixed integral model of the AC / DC interconnected power grid with the to-be-optimized conversion transformer's tap changer gear, and performing solving; finally, recovering AC feasibility to obtain the economical dispatching scheme of the AC / DC interconnected power grid. According to the method, modeling and solving of the AC / DC interconnected power grid are converted into the problem of non-linear optimization of mixed integrals, an iterative computing framework is provided, and the economical and feasible dispatching scheme can be obtained with the method.

Description

technical field [0001] The invention belongs to the field of economic dispatching of electric power systems, in particular to an economic dispatching method of an AC-DC interconnected power grid. Background technique [0002] The AC power grid has always been the main component of my country's power grid. With the continuous increase in the number of flexible direct current transmission (VSC-HVDC, a way of high-voltage direct current transmission between cross-regional AC power grids) in the power grid in recent years, AC and DC interconnection It will become the main form of the future power grid. [0003] The AC transmission network, the DC transmission network (high-voltage direct current transmission line), and the flexible DC transmission converter station together constitute the AC-DC interconnection grid system. figure 1 The electrical diagram of the flexible DC transmission converter station in the AC-DC interconnected grid is given. Among them, the left side is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/36G06Q10/04G06Q50/06
CPCG06Q10/04G06Q50/06H02J3/06H02J3/36H02J2203/20Y02E40/70Y02E60/60Y04S10/50
Inventor 杨知方钟海旺夏清陆春凌赖晓文汪洋
Owner TSINGHUA UNIV
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