Measuring method for rotational inertia of wind turbine generator unit

Abstract

The invention relates to a measuring method for rotational inertia of a wind turbine generator unit. The measuring method comprises the following steps that 1 the weather of which the wind speed is stable in the maximum wind energy capture area of the wind turbine generator unit is selected to conduct measurement; 2 an energy-balance equation is established; and 3 the rotational inertia of the wind turbine generator unit is worked out. According to the measuring method for the rotational inertia of the wind turbine generator unit, measurement is conducted in the maximum wind energy capture area of the wind turbine generator unit when the wind speed is stable; the wind turbine generator unit is controlled to operate in a maximum wind energy tracing mode, and first useful output power and a first rotor rotating speed are obtained; the operation mode of the wind turbine generator unit is changed, the useful output power of the wind turbine generator unit is changed into second useful output power, the rotor rotating speed is changed into a second rotor rotating speed, and first output electric energy is obtained, so that the energy-balance equation is established; the rotational inertia of the wind turbine generator unit is determined based on the energy-balance equation. The measuring method for the rotational inertia of the wind turbine generator unit has the advantage of being excellent.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method for measuring the moment of inertia of a wind turbine. Background technique [0002] Various faults in the power system will cause the power system to enter a transient process. The inertia time constant of the generator directly affects the frequency change of the power system and determines whether it can maintain stable operation after the end of the transient process. Traditional generator sets and power The system is directly connected, and its inertial time constant depends only on the mechanical structure of the rotor, while wind turbines or tidal energy generators, etc. The control strategy of the electronic converter is closely related. [0003] The power electronic converter control strategy needs to determine the stored kinetic energy of the wind turbine rotor in order to provide support in maintaining the stability of the power system. The kinetic ene...

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Problems solved by technology

[0006] The disadvantages of the above-mentioned technical scheme are: 1. the above-mentioned scheme can only be applied to the measurement of the inherent moment of inertia of the electric motor with controllable torque, and the rotating part of the wind turbine also includes parts such as blades, hubs, gears, etc., and the above-mentioned scheme cannot be used to measure this part of the machine. moment of inertia of the structure

2. The above scheme cannot measure the moment of inertia of the wind turbine when it is running

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