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Dynamic characteristic analysis method of direct-driven wind power generation system under conventional control strategy

A technology of conventional control and system analysis, applied in wind turbines, wind turbine control, wind power generation, etc., can solve problems such as unfavorable guidance engineering applications, and achieve the effect of improving stability.

Active Publication Date: 2020-06-26
HUNAN UNIV OF TECH
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Problems solved by technology

[0005] The present invention aims at the problem that the impedance analysis method in the existing analysis method is quite different from the existing power system stability analysis method, which is not conducive to guiding engineering applications

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  • Dynamic characteristic analysis method of direct-driven wind power generation system under conventional control strategy
  • Dynamic characteristic analysis method of direct-driven wind power generation system under conventional control strategy
  • Dynamic characteristic analysis method of direct-driven wind power generation system under conventional control strategy

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Embodiment Construction

[0054] The present invention will be further described below in combination with specific embodiments.

[0055] A dynamic characteristic analysis method of a direct-drive wind power generation system under a conventional control strategy is as follows:

[0056] D-PMSG grid-connected system topology and control block diagram figure 1 shown. In the figure, the D-PMSG is connected to the power grid through a full-power converter. The machine-side converter controls the output power of the fan and realizes MPPT control. The grid-side converter realizes the stable control of the DC voltage. P in the figure WTref Output given power for fan (including maximum tracking power P MPPT and virtual inertia power P vic ), VIC is the virtual inertia controller, ω is the grid frequency, ω m is the generator speed, i sabc is the generator stator three-phase current, u dc is the DC bus voltage, i gabc is the grid current, C dc is the DC bus capacitor, L is the filter inductance of the fi...

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Abstract

The invention discloses a dynamic characteristic analysis method for a direct-driven wind power generation system under a conventional control strategy. The method comprises the following steps: 1, analyzing the control of the direct-driven wind power generation system, including maximum power control of a fan, control of a machine-side converter and control of a network-side inverter; 2, establishing a state space model of the direct-driven wind power grid-connected system, wherein the state space model comprises a machine-side converter system state space model and a grid-side inverter system state space model; 3, analyzing the dynamic characteristics of the system by using an electrical torque analysis method, and calculating equivalent dynamic characteristic parameters of the system; 4, simulating, verifying and analyzing a conclusion. Characteristic problems of the wind power generation system can be simply and quickly analyzed, new energy grid-connected safe operation is guided,and faults are reduced.

Description

technical field [0001] The present invention relates to a method for analyzing the grid connection of wind power generation, and more particularly, to a method for analyzing the dynamic characteristics of a direct-drive wind power generation system under a conventional control strategy. Background technique [0002] Directly-driven wind turbine with permanent-magnet synchronous generator (D-PMSG) has the advantages of small size and low operating cost, and has been widely used in wind power grid-connected. Different from doubly-fed induction generator (DFIG), D-PMSG power control based on full power converter control is almost completely decoupled from grid frequency response, and large-scale wind turbines are connected to the grid through power electronic converters , The dynamic behavior of the traditional power system dominated by thermal power and hydropower has undergone tremendous changes, and the safe and stable operation of the power system has been threatened to a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38F03D7/00
CPCF03D7/00Y02E10/72Y02E10/76
Inventor 李圣清张东辉陈文李富军
Owner HUNAN UNIV OF TECH
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