Wind power generator set low voltage ride through capability testing method considering phase jump

Abstract

The invention relates to a wind power generator set low voltage ride through capability testing method considering phase jump. The method comprises a step of improving a voltage sag generator and determining a voltage drop specification, a step of carrying out short circuit capacity testing, and determining the resistance of a current limit reactor Xsr connected to a system, a step of adjusting the short circuit reactor Zsc resistance and reactance in an improved voltage sag generator, generating a voltage drop specification needed by a test at a testing point, and testing whether the voltage drop specification is in accordance with a requirement, a step of carrying out no-load testing and load testing according to the test voltage specification in the step (S3), and a step of summing testing and evaluation results after the tests are completed. According to the method, the low voltage ride through capability of the wind power generator set can be evaluated more strictly, and thus the safe accident of the wind power generator set which passes a low voltage ride through test due to the influence of the phase jump in a grid failure is prevented.

Description

technical field [0001] The invention relates to the field of low-voltage ride-through testing of wind turbines, in particular to a method for testing the low-voltage ride-through capability of wind turbines considering phase jumps. Background technique [0002] As countries continue to strengthen the development and utilization of renewable energy, wind energy, as a new energy source that is non-polluting, renewable, occupies less land, and has mature development and utilization technologies, has been developed and utilized in countries all over the world. As the new energy technology with the most large-scale and commercial development prospects, wind power has developed rapidly in the past ten years. By 2010, China had surpassed the United States to become the largest country in the world in terms of installed wind power capacity. With the increasing penetration of wind power in the power grid, the volatility and randomness of wind power have caused a non-negligible impac...

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Problems solved by technology

[0011] Due to the voltage-dividing principle of two reactances, the voltage drop generating device in the existing test procedures can only adjust the amplitude and duration of the voltage drop at the fault point, and cannot generate a voltage phase jump at the test point; the specified voltage drop specification during the test In this method, the factor of phase jump is not considered, which is inconsistent with the most common situation of voltage drop accompanied by phase jump in the actual fault of the power grid, and cannot truly reflect the low voltage ride through process when the wind turbine suffers from an actual fault.

For wind turbines that have passed the existing test, in the actual grid-connected operation, even if they encounter a voltage drop fault with the same sag amplitude and fault duration as the test, due to the influence of phase jump, it may also cause overcurrent and overvoltage Exceeding the protection limit value will cause the machine cut-off protection action, making the wind turbine low voltage ride through failure, affecting the safety of power grid operation

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