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Method for optimizing electric grid hydroelectricity rotation backup in real-time scheduling

A technology of real-time scheduling and spinning reserve, which is applied in the scheduling of capacity allocation and the determination of the spinning reserve capacity of hydropower units, and can solve the problems that the hydropower spinning reserve capacity has not been carefully studied and economical.

Inactive Publication Date: 2009-07-08
国网湖南省电力有限公司信息通信分公司
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Problems solved by technology

[0007] To sum up, the current determination of hydropower spinning reserve capacity has not studied its economics in detail.

Method used

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  • Method for optimizing electric grid hydroelectricity rotation backup in real-time scheduling
  • Method for optimizing electric grid hydroelectricity rotation backup in real-time scheduling
  • Method for optimizing electric grid hydroelectricity rotation backup in real-time scheduling

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the embodiments provided by the accompanying drawings.

[0023] The implementation steps of the method for determining the hydropower rotating reserve capacity of the power grid and its distribution in the real-time dispatching of the present invention are as follows:

[0024] (1) Collect real-time load data through the EMS system. In this system, a load point is collected every T minutes to obtain a sequence of y(n), y(n-1), y(n-2)...y(n-m).

[0025] (2) Set a fixed threshold ε to judge the authenticity of the data. If ε≥|y(n)-y(n-1)|, the collected data y(n) is false data caused by various reasons, and the data of the previous points need to be replaced by linear extrapolation .

[0026] (3) Use the collected data to perform ultra-short-term load forecasting, and obtain the forecasted load y'(n+1) at the next moment (the next T minutes). In the present invention, the ultra-short-term load ...

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Abstract

The invention relates to a method used for optimizing the electric network hydropower spinning spare capacity in the real-time dispatching. The method utilizes an EMS system to acquire the real-time electric network load data, and the ultra short-term load prediction is performed after preprocessing; the curve fitting is performed to a sequence formed by the real-time load and the predicted data based on the least square to obtain the absolute value of the maximum deviation between the sequence point and the curve, and the absolute value is determined as the hydropower spinning spare capacity of the next segment; and the no-load quotative discharge under the current water head of a hydropower generating unit is divided by the full output quotative discharge and then multiplied by the full output (i.e. the spinning spare capacity of the hydropower generating unit) to obtain a start-up ordering coefficient, and a machine set combination with the minimum energy consumption and the reserve capacity meeting the requirement is obtained by a heuristic searching algorithm. The method has the advantages that the method changes the traditional method of determining the hydropower spinning spare capacity according to a load coefficient and reduces the no-load reserve capacity of the hydropower; and the method utilizes the no-load energy dissipation coefficient to guide the start-up of the hydropower generating unit, further optimizes the economical operation of the hydropower generating unit and achieves the purposes of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the fields of economical operation of hydroelectric units and energy-saving dispatching of power grids, in particular to a method for determining the rotating reserve capacity of hydroelectric units in real-time dispatching of the power grid and a dispatching method for capacity allocation. technical background [0002] The modern power system is composed of many units such as generator sets, transformers, transmission and distribution lines, and electrical equipment. It is a complex nonlinear dynamic system with a wide distribution area. At present, with the development of national networking, "power transmission from west to east" and mutual supply between north and south, a larger power system is gradually taking shape. Electric energy has the particularity of "power generation, transmission, distribution, electricity sales, and electricity consumption" being completed at the same time, and cannot be stored in large quantiti...

Claims

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Application Information

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IPC IPC(8): H02J3/46
Inventor 李宁李辉王正纲李军陈辉华
Owner 国网湖南省电力有限公司信息通信分公司
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