Damping control method of permanent magnetic direct-driven wind generating set

A wind turbine and damping control technology, applied in the field of control, can solve the problems of continuous oscillation of the system, unable to ensure the safe and stable operation of the power system, aggravating the oscillating power of the synchronous generator, etc., to ensure safe and stable operation and improve transient stability. Effect

Inactive Publication Date: 2012-07-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Although the power electronic converter isolates the influence of system power oscillation on variable-speed constant-frequency wind turbines, after the power grid is disturbed by faults, the fluctuation of wind power and the disconnection of wind turbines that do not have low-voltage ride-through capabilities will aggravate the regional power grid. The oscil

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  • Damping control method of permanent magnetic direct-driven wind generating set
  • Damping control method of permanent magnetic direct-driven wind generating set
  • Damping control method of permanent magnetic direct-driven wind generating set

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[0032] The invention allows the permanent magnet direct-drive wind turbine to quickly adjust the active and reactive power output of the wind turbine according to the grid frequency error signal, utilize the independent and flexible power adjustment characteristics of the full power converter, and take active power after power oscillation occurs in the grid. , Reactive power damping control, accelerate the system oscillation attenuation, and then increase the system damping, and after the grid oscillation ends, the permanent magnet direct-drive wind turbine will be restored to the operating state before the system disturbance.

[0033] Analysis of Active Damping Control Principle

[0034] See figure 1 , For the grid-connected system G1 with permanent magnet direct-drive wind farms, the second-order classical model with constant E is adopted and the mechanical power Pm is considered to be constant. The equation of motion can be expressed as:

[0035] (...

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Abstract

The invention provides a damping control method of a permanent magnetic direct-driven wind generating set, and is used for improving transient-state stability of an electric network. The technical scheme is as follows: the damping control method comprises active damping control and reactive damping control, wherein the active damping control is realized by quickly adjusting the active output of the wind generating set and injecting damping power into the electric network according to the variation of the electric network frequency on the basis of maximum power tracking control policy, thereby further increasing the system damping; and the reactive damping control is realized by rapidly providing reactive power for the electric network by utilizing the net side convertor of the permanent magnetic direct-driven wind generating set according to the variation of the electric network frequency, thereby inhibiting system power oscillation. According to the invention, the characteristic of independent adjusting of active power and reactive power of the permanent magnetic direct-driven wind generating set is utilized, and the system damping is increased by active and reactive adjusting, thus the problem that the regional electric network with higher wind electricity permeability is lack of system damping is well solved, the transient-state stability of the electric network is improved and the safe and stable operation of the electric system is guaranteed.

Description

technical field [0001] The invention relates to a control method of a permanent magnet direct-drive wind power generator set, which can make the wind power set participate in the active and reactive power adjustment of the power grid when the grid power oscillates, suppress system oscillation, and improve the transient stability of the system , belongs to the field of control technology. Background technique [0002] The low-frequency oscillation of grid power has an important impact on the safe and stable operation of the power system, and for regional grids with a high proportion of wind power installed capacity, this problem will become more prominent. Although the power electronic converter isolates the influence of system power oscillation on variable-speed constant-frequency wind turbines, after the power grid is disturbed by faults, the fluctuation of wind power and the disconnection of wind turbines that do not have low-voltage ride-through capabilities will aggravat...

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Application Information

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IPC IPC(8): H02J3/24H02J3/48H02J3/50
CPCY02E10/763Y02E10/76
Inventor 王毅张祥宇李和明王慧
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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