Optimal allocation method for positive and negative spinning reserve capacity in system comprising wind farm

A technology of rotating reserve capacity and reserve capacity, applied in wind power generation, single grid parallel feeding arrangement, etc., can solve the problem of not considering wind power, etc.

Active Publication Date: 2015-05-27
STATE GRID CORP OF CHINA +3
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Problems solved by technology

The above methods all build models from an economic point of view, but do not consider the benefits brought by wind power instead of traditional thermal power

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  • Optimal allocation method for positive and negative spinning reserve capacity in system comprising wind farm
  • Optimal allocation method for positive and negative spinning reserve capacity in system comprising wind farm
  • Optimal allocation method for positive and negative spinning reserve capacity in system comprising wind farm

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Embodiment Construction

[0043] The present invention proposes a method for optimal distribution of positive and negative rotating reserve capacity among thermal power units in a wind power system. The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0044]When the actual output power of the wind farm is greater than the predicted value, the maximum utilization of wind power resources is realized by reducing the output of the thermal power unit. That is, when the output of the wind farm is predicted to reach the limit value, in order to ensure the energy balance of the system, if the wind power output is increased at this time, the output of the thermal power unit must be reduced. The reduced output of this part of the thermal power unit is the negative rotation reserve capacity. Firstly, an economic model is constructed with negative spinning reserve capacity revenue R as the objective function, as described in formula (1). Since the...

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Abstract

The invention discloses an optimal allocation method for positive and negative spinning reserve capacity among thermal power units in a system comprising a wind farm. According to the method, a spinning reserve capacity benefit model is constructed by taking the running economy and reliability of the system into account, namely, the cost of positive spinning reserve capacity, power generation benefits of negative spinning reserve capacity, obvious reduction of the situation that electric quantity is lower than an expected value after the spinning reserve capacity configuration of the system, an equivalent power function is used for describing the output of the thermal power units and wind turbine generators, and the allocation of the spinning reserve capacity among the thermal power units which are put into operation is optimized by virtue of a probabilistic production simulation calculation method. The method has certain reasonability, and a feasible reference is provided for the large-scale reliable grid-connected running of the wind turbine generators.

Description

technical field [0001] The invention relates to the research field of electric power balance including wind farms, in particular to an optimal allocation method of positive and negative rotating reserve capacity among thermal power units in a wind power system. Background technique [0002] In order to ensure a balanced, stable and reliable power supply of the power system, the system usually reserves a certain reserve capacity to deal with random fluctuations in load and random failures of generator sets, including frequency modulation reserve (2%-3% of the maximum load), emergency reserve (maximum load 8%-10% of the system, and should be greater than the capacity of the largest unit in the system) and spare for maintenance, etc. This simple method of selecting a fixed capacity value as a backup has been widely used in the power industry, but it is difficult to meet the increasing scale of wind power grid-connected power systems, and it does not have good economics. Theref...

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Application Information

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IPC IPC(8): H02J3/46
CPCH02J3/46Y02E10/76
Inventor 王国权刘华勇周平王森乔伟泽刘长新
Owner STATE GRID CORP OF CHINA
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