Method and system for evaluating high-voltage ride through capability of wind turbine generator variable pitch system

Abstract

The invention provides a method and a system for evaluating the high-voltage ride through capability of a wind turbine generator variable pitch system. The method comprises the following steps: carrying out data auditing on the voltage endurance capability of related components in the variable pitch system, judging whether the working time of the related components is not less than threshold timeunder the condition that the voltage endurance capability is not less than the threshold voltage, if so, carrying out the next step, and if not, judging that the evaluation is unqualified, and terminating the evaluation; performing interactive signal checking on the variable pitch system under the condition that the voltage is not less than the threshold voltage, judging whether a normal interactive signal can be generated or not, if so, performing the next step, and if not, determining that the evaluation is unqualified and terminating the evaluation; performing a high-voltage ride through performance platform test on the variable pitch system, judging whether feathering or abnormal working conditions occur in the test process, if so, evaluating to be unqualified, and if not, evaluating to be qualified. According to the method, the high-voltage ride through capability of the wind turbine generator pitch system is comprehensively evaluated through data auditing and factory testing, manpower and material resources are saved, the evaluation period is shortened, and the evaluation result is good in credibility.

Description

technical field [0001] The invention relates to the technical field of new energy access and control, in particular to a method and system for evaluating the high-voltage ride-through capability of a wind turbine pitch system. Background technique [0002] In recent years, the high proportion of wind power grid-connected operation has brought great challenges to the safe and stable operation of the power system. Many large-scale wind power off-grid accidents show that the recovery process of low voltage faults is often accompanied by the emergence of high voltage. In the actual operation of wind farms, voltage problems such as resonance overvoltage and operating overvoltage may also occur. In addition, as HVDC projects are gradually put into operation, there is a risk of commutation failure and DC blocking in the UHVDC transmission system at the large-capacity DC input transmission grid, and the filter that does not exit in time after the DC system fails will be sent to the...

AI Technical Summary

Problems solved by technology

The high-voltage process will cause the voltage of the wind turbine power supply system to increase, which in turn will cause the DC bus voltage of the pitch system to increase, and there may be an instantaneous voltage drop after the high voltage is restored, which requires the pitch system to have fault voltage ride-through capability

[0004] For wind turbines that have passed the high-voltage ride-through field test, after replacing the components of the pitch system, it is impossible to simply determine whether the pitch system has high-voltage ride-through capability, and it is costly, time-consuming and labor-intensive to conduct the high-voltage ride-through field test of the wind turbine again

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