Active output fluctuation stabilizing method based on operating working condition of wind driven generator

Abstract

The invention relates to the technical field of wind driven generators, in particular to an active output fluctuation stabilizing method based on an operating working condition of a wind driven generator. The invention provides the active output fluctuation stabilizing method based on the operating working condition of the wind driven generator. The method stabilizes power at high frequency deviation and at low frequency deviation, that is, the method comprises the steps of storing energy effectively by means of a rotating part of a fan to inhibit active output fluctuation at high frequency deviation and releasing energy to a power grid effectively by means of the rotating part of the fan to inhibit the active output fluctuation at low frequency deviation, so that a double-fed wind drivengenerator unit takes part in power stabilization actively to smooth the frequency fluctuation of the system, thereby reducing the starting number of times of primary frequency modulation of a synchronous generator.

Description

technical field [0001] The invention relates to the technical field of wind power generators, in particular to a method for smoothing active output fluctuations based on the operating conditions of the wind power generator. Background technique [0002] With the continuous development of wind power generation technology, the installed capacity of wind turbines is increasing day by day; due to the use of advanced power electronic converter devices in double-fed wind turbines, the advantages of maximum power tracking operation and decoupling control of active and reactive power are realized. , but it also leads to the decoupling of the mechanical part of the wind turbine from the grid frequency; the wind turbine cannot provide inertial response like a synchronous motor; especially in the grid-connected system with high wind power penetration, it causes serious system frequency deviation. In addition, compared with conventional thermal power units, wind turbines have poorer abi...

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Problems solved by technology

[0003] At present, the existing technical methods for active power fluctuation stabilization, due to the influence of constant control parameters, the fan cannot make full use of the rotational kinetic energy stored in the rotor, thereby limiting the ability of the fan to stabilize active power fluctuations; in addition, in the low fan rotor speed scenario , Excessive energy release will easily cause the instability of the fan speed, and then cause a serious drop in the secondary frequency; increase the fluctuation of the system frequency, and in severe cases, it will cause the fan to be disconnected and trigger the low-frequency load shedding device to start. Therefore, how to effectively use The rotational kinetic energy of the fan to stabilize the fluctuation of active output is a technology that needs to be solved urgently in the future

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