A control method for wind power system operation based on wind power prediction uncertainty
A wind power prediction and wind power system technology, applied in the field of operation control, wind power system operation and new energy, can solve problems such as not considering wind power prediction information, reducing wind power reception capacity and system operation economy, and achieve universal applicability Effect
Active Publication Date: 2016-04-27
STATE GRID CORP OF CHINA +2
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Problems solved by technology
However, if the wind power prediction information is not considered, the operation mode of the unit combination will not be optimal, so that when the wind power generation is large, the wind power will be abandoned due to the climbing limit of other units, which will reduce the wind power acceptance capacity and system operation economy.
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Embodiment 1
[0050] The backup decision-making method described in the present invention is based on the data of a provincial power grid in Northwest my country to perform simulation calculations to calculate the day-ahead backup demand of a certain day. First, a certain time is taken as an example to perform backup calculations, and then the other 95 time points are calculated according to the same method. Standby demand (15min interval, 96:00 every day), the wind power forecast, load forecast and unit combination of the simulation day are as follows figure 2 shown. The calculation steps are as follows:
[0051](1) Take time point 20 as an example for illustration. First, according to step S10, the planned output of the unit at this moment is obtained, and the load uncertainty is described by a normal distribution, and then the predicted value of the wind power point is converted into a probability distribution form according to the empirical distribution;
[0052] (2) According to step...
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The invention provides a control method of wind power system operation based on wind power prediction uncertainty. The method comprises the steps of inputting basic database related to a grid of a running reserve to-be-determined time, carrying out convolution calculation of conventional unit rate probability distribution and conventional unit total rate probability distribution to obtain a capacity outage probability table (COPT) of a conventional unit, calculating the probability distribution of the sum of conventional unit total rate and wind power rate according to the capacity outage probability table (COPT) of the conventional unit, calculating the probability distribution of the difference between wind power system total rate and a load and obtaining wind power system generation margin probability distribution, obtaining the function expression between risk indication EENS and needed reserve capacity R through a curve fitting method based on system power generation margin probability distribution, and calculating a wind power system minimum reserve requirement.
Description
technical field [0001] The invention belongs to the field of wind power system operation and new energy technology, in particular to the field of control technology including the operation of a large-scale wind power system. Background technique [0002] As the installed capacity of wind power continues to increase, the proportion of wind power grid-connected output to the total output continues to increase. Due to the volatility and randomness of wind power, if more wind power needs to be accommodated, the wind power system needs to have a flexible operation mode and backup support. According to statistical data, the wind power output peak-shaving characteristics of most wind power bases in China show the characteristics of reverse load peak-shaving, which increases the peak-valley difference of net load and increases the difficulty of unit combination arrangement. In addition, the current uncertainty of wind power (the uncertainty of forecast and the uncertainty of extrem...
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IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 曹银利鲁宗相王玮李海波张鹏乔颖
Owner STATE GRID CORP OF CHINA