Method and device for dividing fault ride-through intervals of wind turbine generator

Abstract

The invention provides a method and a device for dividing fault ride-through intervals of a wind turbine generator. The method comprises the following steps of: determining a wind turbine generator implementation control moment after a power grid fault occurs, a wind turbine generator implementation control moment after the power grid fault is removed, a wind turbine generator control stabilization moment after the power grid fault occurs and a wind turbine generator control stabilization moment after the power grid fault is removed; and dividing the fault ride-through intervals of the wind turbine generator based on the four moments. According to the invention, the fault ride-through intervals of the wind turbine generator can be automatically divided; the universality is high; and the control response characteristic of a simulation model can be verified. Based on fault ride-through actual measurement data of the wind turbine generator, the problems of large automatic interval division errors and poor universality caused by standard fixed time duration can be effectively solved, manual correction workload can be avoided, and the method and the device can be applied to high-voltageride-through tests and low-voltage ride-through tests at the same time.

Description

technical field [0001] The invention relates to the field of new energy technologies, in particular to a method and device for dividing fault ride-through intervals of wind turbines. Background technique [0002] The research on fault ride-through simulation of power system including wind power requires that the electrical simulation model of wind turbines can accurately simulate the fault ride-through response characteristics of actual wind turbines. Power system regulation decisions based on erroneous simulation results can lead to system disturbances, equipment damage, and even large-scale power grid accidents. Therefore, before implementing the wind power grid-connected simulation analysis, the accuracy of the fault ride-through response characteristics of the wind turbine electrical simulation model should be verified. [0003] Reasonable division of transient and steady-state intervals in the whole process of wind turbine fault ride-through is the basis of model verif...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of the poor versatility of interval division in the prior art and the difficulty in verifying the control response characteristics of the simulation model, the present invention provides a method and device for dividing fault ride-through intervals of wind turbines, which brings the measured data at the output end of wind turbines into the pre-set The constructed artificial neural network model determines the control time of the wind turbine after the grid fault occurs, the control time of the wind turbine after the grid fault is cleared, the stable control time of the wind turbine after the grid fault occurs, and the stable control time of the wind turbine after the grid fault is cleared; based on wind power The actual measurement data at the output of the unit, the control time of the wind turbine after the grid fault occurs, the control time of the wind turbine after the grid fault is cleared, the stable control time of the wind turbine after the grid fault occurs, and the stable control time of the wind turbine after the grid fault is cleared. The intervals are divided, and the measured data include the fundamental positive sequence value, active power value and three-phase current value of the low-voltage side bus voltage at the output end of the generator set, which can automatically divide the fault ride-through interval of the wind turbine generator set, and has strong versatility and can verify the simulation Model Control Response Characteristics

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