A Quantitative Method for Evaluating the Centralized Access Degree of Grid-Connected Wind Power
A technology of centralized access and quantitative method, applied in the quantitative field of evaluating the centralized access degree of grid-connected wind power, can solve the problems of peak regulation, wind power transmission, system power flow, etc., and achieve the effect of good technical support
Active Publication Date: 2017-08-22
NARI TECH CO LTD +1
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Problems solved by technology
Due to the inherent randomness and intermittent nature of wind power output, it is difficult for wind power units to be pre-scheduled like thermal power units and hydropower units. Therefore, the large-scale access of wind power has brought many problems to the dispatching operation of the power grid: system power flow, stability issues, and wind power output. problems, peak shaving problems, system backup arrangement problems, many coordination problems of operating units, etc.
[0010] At present, there is no clear judgment index or standard system for the way of large-scale wind power access to the grid, but this is the basis for analyzing the capacity of the grid to absorb wind power and subsequent grid-connected control of wind power
Method used
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[0025] The present invention will be described in further detail below with reference to the accompanying drawings and examples.
[0026] Such as figure 1 Shown, the inventive method mainly comprises three steps:
[0027] 1) First, count the total installed wind power capacity P of the wind power access points to be evaluated in the power grid ce , and calculate the short-circuit capacity S of the access point ac , S ac The calculation formula is:
[0028]
[0029] Among them, U av is the average rated voltage at the short circuit, I i It is the initial value of the AC component of the short-circuit current when the three-phase short circuit occurs. It is suggested that the calculation of short-circuit capacity should be carried out in a method that is not based on the power flow (based on the scheme) and independent of the power flow method in the full power-on mode. The specific calculation methods have mature algorithms and will not be described in detail here.
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The present invention discloses a quantification method of assessing a grid connected wind power centralized access degree which belongs to the new energy power generation technology grid connected analysis field. The present invention provides a quantitative index of centralized access (QICA) which determines whether the wind power is in centralized access quantitatively, and the determination is carried out by calculating the QICA value of a wind power access point in a power grid. When the QICA value of the wind power access point is greater than a, a node is determined to be in centralized access; when the QICA value of the wind power access point is not more than a, the node is determined to be in a non-centralized access mode, and the value of a can be decided by the actual situation of the power grid. The quantification method of the present invention can quantify and assess the wind power centralized access degree effectively, and provides guidance for the subsequent control of the new energy and the admitting ability analysis of the power grid to the new energy.
Description
technical field [0001] The invention belongs to the field of grid-connected analysis of new energy power generation technology, and more precisely, the invention relates to a quantification method for evaluating the centralized access degree of grid-connected wind power. Background technique [0002] With the rapid growth of my country's wind power installed capacity, the proportion of wind power in the grid continues to increase. Due to the inherent randomness and intermittent nature of wind power output, it is difficult for wind power units to be pre-scheduled like thermal power units and hydropower units. Therefore, the large-scale access of wind power has brought many problems to the dispatching operation of the power grid: system power flow, stability issues, and wind power output. problem, peak shaving problem, system backup arrangement problem, many coordination problems of operating units, etc. Many of the above problems have affected the ability of the grid to acce...
Claims
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IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 周霞李威李碧君崔晓丹侯玉强张晋王吉利柯贤波霍超程林
Owner NARI TECH CO LTD