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Doubly-fed wind farm group aggregating method and doubly-fed wind farm group aggregating system based on dynamic characteristics of rotor current

A doubly-fed wind farm and rotor current technology, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as the influence of the transient characteristics of the electrical quantity at the outlet of the wind farm without consideration

Inactive Publication Date: 2017-02-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

Aiming at this problem, Zhou Ming et al. (Zhou Ming, Ge Jiangbei, Li Gengyin. Dynamic voltage equivalent method of DFIG type wind farm based on cloud model [J]. Chinese Journal of Electrical Engineering Process 2015, 35(5), 1097-1105.) adopted cloud The method of the model, but only for the dynamic process of wind turbine chain off-grid, based on the terminal voltage of the wind turbine, does not consider the influence of the crowbar action characteristics of the wind turbine on the transient characteristics of the wind farm outlet electrical quantity, especially the transient short-circuit current

Method used

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  • Doubly-fed wind farm group aggregating method and doubly-fed wind farm group aggregating system based on dynamic characteristics of rotor current
  • Doubly-fed wind farm group aggregating method and doubly-fed wind farm group aggregating system based on dynamic characteristics of rotor current
  • Doubly-fed wind farm group aggregating method and doubly-fed wind farm group aggregating system based on dynamic characteristics of rotor current

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Embodiment

[0060] in the attached Figure 7 In the wind farm model shown, the parameters of the 1.5MW fan are: Pe=1.5MW, Ue=690kV, Rs / p.u.=0.01, Xs / p.u.=0.1, Rr / p.u.=0.01, Xr / p.u.=0.1, Xm / p.u.=3.5; H=4.02s, D=1.5s, K=80.27. Among them, Rs, Xs, Rr, Xr, and Xm are the stator resistance, stator reactance, rotor resistance, rotor reactance, and excitation reactance parameters of the generator, respectively. H, D, and K are the inertial time constant of the fan, the shafting damping coefficient and the shafting stiffness coefficient, respectively.

[0061] The low-voltage ride-through capability of the wind turbine adopts the default setting of the simulation software DIgSILENT. Among them, Crowbar setting: when the rotor current is greater than 2pu, the Crowbar is turned on; if the rotor current is less than 2pu, the Crowbar is cut off.

[0062] In the case of random input wind speed and random PCC voltage drop, obtaining the peak value of the rotor current of the fan under different con...

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Abstract

The invention belongs to the technical field of wind power generation, and especially relates to a doubly-fed wind farm group aggregating method and a doubly-fed wind farm group aggregating system based on the dynamic characteristics of rotor current. The method comprises the following steps: building a doubly-fed wind farm model, and obtaining the rotor current peaks of each fan under different wind conditions and fault conditions as cloud droplet sample data through random combination of random wind speed and random voltage drop degree; according to the obtained cloud droplet sample data, using a reverse cloud generator to get three digital characteristics of a rotor current peak cloud model of each fan, namely, expectation, entropy and hyper entropy; and taking the three digital characteristics of each fan as wind farm grouping indexes, and using a clustering algorithm to group and aggregate large wind farms. The wind farm group aggregating method of the invention can accurately reflect the transient fault characteristics of wind farms under random wind speed and random voltage drop degree and provide model support for short-circuit current calculation and relay protection setting of wind farms.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a doubly-fed wind farm cluster aggregation method and system based on rotor current dynamic characteristics. Background technique [0002] With the extraordinary growth of wind power installed capacity, the impact of large-scale wind power access on the power system cannot be ignored. In the early days of wind power development, the contribution of wind turbines to the system short-circuit current was not considered when calculating the short-circuit current of the power system. However, with the increase of installed wind power capacity, the above-mentioned methods no longer meet the requirements of calculation and analysis, and the contribution of wind power to short-circuit current cannot be ignored. [0003] It is difficult to directly calculate the short-circuit current of a wind farm. The current main idea is to deduce the change law of the short-...

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Application Information

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IPC IPC(8): H02J3/38G06K9/62
CPCH02J3/386H02J2203/20G06F18/23213Y02E10/76
Inventor 郑涛魏旭辉李菁赵裕童陈璨吴林林刘辉
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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