A distributed wind power low-voltage ride-through and anti-islanding protection coordination control method

CN114567000BActive Publication Date: 2026-06-05WINDEY ENERGY TECHNOLOGY GROUP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WINDEY ENERGY TECHNOLOGY GROUP CO LTD
Filing Date
2021-12-31
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies have not truly achieved coordinated control of low voltage ride-through and anti-islanding protection for distributed wind turbines, resulting in frequent disconnection of wind turbines due to transient voltage faults, affecting power generation and causing multiple impacts on the power grid.

Method used

A distributed wind power low voltage ride-through and anti-islanding protection coordinated control method is adopted. By monitoring the grid connection point voltage in real time, the appropriate action logic is selected according to the voltage development trend. The voltage recovery status is judged by combining Hausdorff distance and wavelet transform technology, avoiding frequent disconnection of wind turbine units and providing reactive current support to help the grid recover.

Benefits of technology

This ensured the stable operation of the wind turbine units, avoided frequent disconnections due to transient voltage faults, guaranteed power generation, reduced the impact on the power grid, and prevented the expansion of accidents caused by permanent faults.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of distributed wind power low voltage ride through and islanding protection coordination control method, comprising the following steps: 1) wind turbine normal operation, real-time monitoring and grid-connected point voltage, when grid-connected point voltage is lower than 0.9, wind turbine enters low voltage ride through mode, records the lowest voltage drop depth V dip And its corresponding time, if V dip <0.2, step 4) is executed;If 0.2≤V dip <0.5, step 3) is executed;If 0.5≤V dip <0.9, step 2) is executed;2) wind turbine runs in low voltage ride through mode, provides reactive current support to help grid voltage recovery, if voltage is normal then step 1) is executed;Otherwise step 4) is executed;3) wind turbine runs in low voltage ride through mode, judges whether voltage can recover, if voltage can recover step 2) is executed;If voltage cannot recover step 5) is executed;4) wind turbine is cut off by low voltage ride through protection action;5) wind turbine is cut off by islanding protection action.
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