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Random optimization method for unit output and topological structure of alternating-current and direct-current system

An AC-DC system and topology technology, which is applied in the field of stochastic optimization for the output and topology of AC-DC systems, and can solve problems such as long time to solve and difficult to solve.

Active Publication Date: 2021-04-13
HUNAN UNIV
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Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a high-efficiency stochastic optimization method for unit output and topology of AC / DC systems, which overcomes the long solution time and time-consuming problem of traditional algorithms for joint optimization of unit output and topology. Difficulty and other issues

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  • Random optimization method for unit output and topological structure of alternating-current and direct-current system
  • Random optimization method for unit output and topological structure of alternating-current and direct-current system
  • Random optimization method for unit output and topological structure of alternating-current and direct-current system

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[0055] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0056] Such as figure 1 As shown, in this embodiment, the steps of the stochastic optimization method for the output and topology of AC / DC system units include:

[0057] S1. Construct an optimization model, taking the total power generation cost of the AC-DC power system with a voltage source converter station under normal conditions as the objective function, and the constraints include the linear power flow model of the AC subsystem, considering V 2 -P droop control DC subsystem linear power flow model, constraints related to the transmission power of the voltage source converter station, and the transmission capacity of the AC and DC branch, the transmission capacity of the voltage source converter station, the active output range of the thermal power unit an...

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Abstract

The invention discloses a random optimization method for unit output and a topological structure of an alternating-current and direct-current system. The random optimization method comprises the following steps: S1, constructing an optimization model; S2, setting the states of all branch switches in the optimization model as a closed state; S3, decomposing the optimization model obtained after processing in the step S2 into a plurality of sub-models, wherein each sub-model only contains one N1 fault or does not contain any fault; s4, solving each sub-model to obtain a solving result of the first-stage optimization model; S5, obtaining an effective switch set according to the solving result of each sub-optimization model; s6, setting the states of other switches except the effective switch in the optimization model constructed in the step S1 as a closed state to obtain a second-stage optimization model; and S7, solving the second-stage optimization model to obtain a final topological structure and unit output combined optimization result. The method can simultaneously and efficiently optimize the output and topology of the AC / DC system unit, and has the advantages of high calculation efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of AC / DC hybrid power systems, in particular to a stochastic optimization method for unit output and topology of AC / DC systems. Background technique [0002] With the advancement and rapid development of voltage source converter (VSC) technology, multi-terminal flexible DC transmission systems have received more and more attention and applications in the field of power systems including offshore wind power (Gang Shi, Guoxiang Wu, XuCai, Zhe Chen. Coordinated control of multi-terminal VSC-HVDC transmission for large offshore wind farms. Proceedings of The 7th International PowerElectronics and Motion Control Conference, 2012). Comprehensive consideration of VSC fast control and power grid topology optimization operation scheduling can effectively improve the economy of AC and DC systems and the correction and control capabilities after faults. However, topology optimization will bring great challenges to the...

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Application Information

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IPC IPC(8): G06F30/20G06Q50/06G06F111/04G06F111/06
CPCG06F30/20G06Q50/06G06F2111/04G06F2111/06
Inventor 谭益廖长风李勇曹一家
Owner HUNAN UNIV
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