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Control method for power angle yaw stability of wind power grid-connected system with controllable inertia

A stable control method and wind power technology, applied in wind power generation, electrical components, circuit devices, etc., can solve problems that have not been paid attention to and change the transient stability characteristics of power grid power angle

Active Publication Date: 2020-07-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the virtual inertia control can effectively solve the low inertia problem caused by wind power grid connection, the dynamic adjustment of the virtual inertia will simultaneously change the transient stability characteristics of the grid power angle, and this problem has not been paid attention to

Method used

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  • Control method for power angle yaw stability of wind power grid-connected system with controllable inertia
  • Control method for power angle yaw stability of wind power grid-connected system with controllable inertia
  • Control method for power angle yaw stability of wind power grid-connected system with controllable inertia

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Experimental program
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Effect test

Embodiment 1

[0026] like figure 1 As shown, a power angle yaw stability control method for a wind power grid-connected system with controllable inertia includes the following specific steps:

[0027] Step a: Detect the relative power angle δ of the two interconnected power systems, the switch signal S is the time derivative of the relative power angle δ, S=dδ / dt, and judge whether the relative power angle δ has relative swing, if so, then S≠ 0, turn to step b; if not, then S=0, turn to step a;

[0028] Step b: Identify the direction of the first swing relative to the power angle δ. When S>0, it is a forward swing, and when S<0, it is a reverse swing; the generator set with an advanced rotor power angle is a forward generator set, and the generator set with a lagging rotor power angle is Back to the crew, turn to step c;

[0029] Step c: Check whether the fault is removed; if the fault has not been removed, start the virtual inertia controller of the forward unit, and adjust the inertia a...

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Abstract

The invention discloses a control method for improving the power angle first swing stability of a power system with high-permeability wind power. The method comprises during a period from fault occurrence to fault removal, starting the virtual inertia controller of a forward unit, setting an inertia adjustment coefficient to the maximum positive value, and starting the inertia controller of a backward unit to virtualize a negative inertia response when the system frequency fluctuates within a safe range; after a fault is removed, setting the inertia adjustment coefficient of the backward unitto the maximum positive value, and setting the inertia adjustment coefficient of the forward unit to the minimum negative value after the system frequency is in a safe fluctuation range; at the end ofthe power angle first swing, setting the inertia adjustment coefficient of the forward unit to the maximum positive value, and blocking the inertia controller of the backward unit . The method reduces the transient energy accumulated by the system after transient instability, improves the transient power angle first swing stability of the system, and improves the feasibility and safety of the virtual inertia control.

Description

technical field [0001] The invention relates to a control method for power angle yaw stability, in particular to a power angle yaw stability control method for a wind power grid-connected system with controllable inertia, and belongs to the technical field of wind power generation system control. Background technique [0002] The virtual inertial controller of the variable speed wind turbine is in the development stage, and its functions are constantly being improved. Through the addition of df / dt differential links, as well as auxiliary modules such as speed protection and pitch adjustment, the reliability of wind turbines to provide inertial support has been significantly improved. In power grids in areas with high wind power penetration, if the virtual inertia controller is applied to wind turbines, after the introduction of a large number of virtual inertias, the system inertia will no longer be an inherent characteristic that cannot be changed, but will become a new con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/386Y02E10/76
Inventor 张祥宇朱正振付媛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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