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A Cascaded Hydropower Robust Optimal Scheduling Method Based on Stochastic Safety Domain

A technology for optimal scheduling and hydropower robustness, applied in data processing applications, forecasting, instruments, etc., can solve problems such as weak timing correlation, inaccuracy and non-existence of uncertain sets

Active Publication Date: 2021-07-20
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the uncertain set is described by only one band, the worst case is that all parameters are in the most extreme situation, but due to the intrinsic connection between uncertain parameters, the probability of all parameters being in extreme situations at the same time is extremely small or even does not exist , considering that the inflow of cascade hydropower station reservoirs is a continuous, non-stationary random process, showing strong or weak time-series correlation, directly using the traditional method of constructing uncertain sets will lead to inaccuracy of uncertain sets

Method used

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  • A Cascaded Hydropower Robust Optimal Scheduling Method Based on Stochastic Safety Domain
  • A Cascaded Hydropower Robust Optimal Scheduling Method Based on Stochastic Safety Domain
  • A Cascaded Hydropower Robust Optimal Scheduling Method Based on Stochastic Safety Domain

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Embodiment 1

[0086] The present invention proposes a cascaded hydropower robust optimization scheduling method based on a random security domain, which includes the following steps:

[0087] 1) Aiming at the randomness of incoming water, a multi-band uncertain set is used to describe the uncertainty and timing correlation of incoming water, and a multi-band uncertain set of incoming water is established for the random characteristics and timing correlation of mid- and long-term cascade hydropower incoming water. The expression is as follows:

[0088]

[0089]

[0090]

[0091]

[0092] In the formula: h is the number of the hydropower station, t is the time period number, b is the band number, b∈[1,B], and B is the total number of bands. R h,t is the predicted mean value of hydropower station h in time period t. Respectively represent the positive and negative deviation endpoint values ​​of the water inflow of hydropower station h in the time period t of the uncertain b-band...

Embodiment 2

[0162] In order to further analyze the applicability of the present invention, a simulation analysis will be carried out in combination with a large-scale cascade hydropower system in southern my country. The system consists of 10 hydropower stations. First consider that the uncertain fluctuation band of incoming water is 10% of its predicted value, then the traditional single-band uncertainty set is [1-10%, 1+10%]. The multi-band uncertainty set is divided into 5 segments at intervals of 2%, and the corresponding proportion coefficients of each band are 0.25, 0.25, 0.25, 0.125, 0.125. The curve relationship between the power generation benefits and different budget constraint values ​​of the two multi-year cascade hydropower robust dispatching models is as follows: figure 2 shown.

[0163] From figure 2 It can be seen that with the increase of the uncertain budget value, the power generation benefits of the two scheduling models show a monotonically decreasing trend, so ...

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Abstract

The present invention relates to a cascade hydropower robust optimal dispatching method based on a random security domain, which comprises the following steps: 1) establishing a random security domain according to the uncertainty of the medium and long-term cascade hydropower incoming water and its timing correlation, that is, considering the incoming water sequence Correlation multi-band uncertain set; 2) Construct a robust two-stage model with economical and security coordination based on the multi-band uncertain set; 3) Solve the multi-year cascade hydropower pre-scheduling in the first stage of the robust two-stage model model to obtain the pre-dispatch plan of the hydropower station and the storage capacity of the reservoir under the forecast scenario; 4) transform the re-dispatch model of the second stage in the robust two-stage model into a max‑min mathematical optimization problem, and analyze the robustness of the pre-dispatch plan Feasibility is judged, and a robust scheduling scheme is finally obtained through feedback correction, coordination and optimization. Compared with the prior art, the present invention has the advantages of being accurate and reliable, considering the timing correlation of incoming water, coordinating robustness and economy, and the like.

Description

technical field [0001] The invention relates to the field of cascade hydropower dispatching, in particular to a method for cascade hydropower robust optimal dispatching based on random safety domains. Background technique [0002] The main task of multi-year cascade hydropower optimal dispatching is to take two years as the dispatching cycle and monthly as the dispatching period, combine all possible water inflows in the two years, and optimize the hydropower and reservoir dispatching plan under various constraints. Compared with short-term optimal dispatching, the multi-year cascade hydropower dispatching cycle is longer and the space for optimization is larger, which has always been a hot topic of research. [0003] Affected by natural factors, the inflow of water to the reservoir changes randomly during the inter-annual hydropower dispatch cycle. For this reason, the deterministic dispatch method that assumes that the inflow water is a fixed value has limited applicabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q10/06G06Q50/06
CPCG06Q10/04G06Q10/06313G06Q50/06
Inventor 葛晓琳钟俊玲金言
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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