Wind turbine generator unit pitch system standby power supply online automatic detection method and device

The invention discloses a wind turbine generator unit pitch system standby power supply online automatic detection method and device. The method comprises the following steps that A. detection parameter standards and relevant parameter standards for adopting standby power supply feathering are set, wherein the detection parameter standards comprise external constraint conditions and unit state conditions for starting detection; B. whether the external constraint conditions and the unit state conditions satisfy testing requirements or not is judged; C. if the external constraint conditions and the unit state conditions satisfy the testing requirements, standby power supplies start to be tested; D. a statistic analysis is conducted on detection data acquired by the step C, the detection data are compared with the set relevant parameter standards for standby power supply feathering, and if the detection data surpass the set standards, failure warning is carried out. The wind turbine generator unit pitch system standby power supply online automatic detection method and device can achieve performance detection of all wind turbine generator unit pitch system standby power supplies, are free of manual intervention and achieve online fault diagnosing or early warning through the modes of setting various parameter standards and time intervals of periodic detection.