New energy station abnormal frequency processing method and system under broadband harmonic working condition
A new energy and station technology, applied to harmonic reduction devices, AC networks to reduce harmonics/ripples, wind power generation, etc., can solve the problems of frequency calculation result errors, power fluctuations of new energy stations, and grid-connected points. It achieves the effects of preventing FM misoperation, improving safety and stability, and reducing the number of FM actions
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Embodiment 1
[0044] A method for processing abnormal frequencies of new energy stations under broadband harmonic conditions, such as figure 1 shown:
[0045] S1: Collect the instantaneous voltages of the measurement points at different electrical positions of the new energy station;
[0046] S2: take the power frequency as a period, calculate the number of zero-crossing points of the instantaneous voltage, and when the number of zero-crossing points of the voltage is abnormal, calculate the time interval between two adjacent zero-crossing points;
[0047] S3: Determine the blocking and opening of the fast frequency modulation function of the new energy power station based on the time interval between the two adjacent zero-crossing points and the set threshold.
[0048] The present invention provides a method for processing abnormal frequency of a new energy station under broadband harmonic working conditions, comprising:
[0049] In S1, the instantaneous voltage of the measurement points a...
Embodiment 2
[0080] The following is an illustration of a specific case.
[0081] It runs in parallel with the existing fast frequency control strategy of the new energy station, and uses a fixed sampling rate. In this embodiment, 20kHz is used to collect the instantaneous voltage U of the grid connection point of the new energy station. H , the instantaneous voltage U of the 35kV bus in the station M and the instantaneous voltage U on the outlet side of the power generation unit (wind turbine / photovoltaic inverter) L , and the collected instantaneous voltage U of the grid-connected point H , the instantaneous voltage U of the 35kV bus in the station M and the instantaneous voltage U on the outlet side of the power generation unit (wind turbine / photovoltaic inverter) L It is stored in the fast frequency modulation controller of the wind farm for backup;
[0082] Taking the power frequency period as the period, in this embodiment, taking 0.2s as the power frequency period, calculate the...
Embodiment 3
[0089] The present invention based on the same inventive concept also provides an abnormal frequency processing system for a new energy station under broadband harmonic conditions, including:
[0090] The acquisition module is used to collect the instantaneous voltage of the measurement points at different electrical positions of the new energy station;
[0091] a calculation module, used for calculating the number of zero-crossing points of the instantaneous voltage with the power frequency frequency as a period, and calculating the time interval between two adjacent zero-crossing points when the number of zero-crossing points of the voltage is abnormal;
[0092] The regulation module is configured to determine the blocking and opening of the fast frequency regulation function of the new energy station based on the time interval between the two adjacent zero-crossing points and the set threshold.
[0093] The control module includes:
[0094] A temporary blocking sub-module,...
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